summaryrefslogtreecommitdiffhomepage
path: root/editors/vi.c
blob: ad6dd5c744b2ba127b356483a7b28f1456326211 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
/* vi: set sw=8 ts=8: */
/*
 * tiny vi.c: A small 'vi' clone
 * Copyright (C) 2000, 2001 Sterling Huxley <sterling@europa.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

static const char vi_Version[] =
	"$Id: vi.c,v 1.22 2002/07/31 21:22:21 sandman Exp $";

/*
 * To compile for standalone use:
 *	gcc -Wall -Os -s -DSTANDALONE -o vi vi.c
 *	  or
 *	gcc -Wall -Os -s -DSTANDALONE -DCONFIG_FEATURE_VI_CRASHME -o vi vi.c		# include testing features
 *	strip vi
 */

/*
 * Things To Do:
 *	EXINIT
 *	$HOME/.exrc  and  ./.exrc
 *	add magic to search	/foo.*bar
 *	add :help command
 *	:map macros
 *	how about mode lines:   vi: set sw=8 ts=8:
 *	if mark[] values were line numbers rather than pointers
 *	   it would be easier to change the mark when add/delete lines
 *	More intelligence in refresh()
 *	":r !cmd"  and  "!cmd"  to filter text through an external command
 *	A true "undo" facility
 *	An "ex" line oriented mode- maybe using "cmdedit"
 */

//----  Feature --------------  Bytes to immplement
#ifdef STANDALONE
#define vi_main			main
#define CONFIG_FEATURE_VI_COLON	// 4288
#define CONFIG_FEATURE_VI_YANKMARK	// 1408
#define CONFIG_FEATURE_VI_SEARCH	// 1088
#define CONFIG_FEATURE_VI_USE_SIGNALS	// 1056
#define CONFIG_FEATURE_VI_DOT_CMD	//  576
#define CONFIG_FEATURE_VI_READONLY	//  128
#define CONFIG_FEATURE_VI_SETOPTS	//  576
#define CONFIG_FEATURE_VI_SET	//  224
#define CONFIG_FEATURE_VI_WIN_RESIZE	//  256  WIN_RESIZE
// To test editor using CRASHME:
//    vi -C filename
// To stop testing, wait until all to text[] is deleted, or
//    Ctrl-Z and kill -9 %1
// while in the editor Ctrl-T will toggle the crashme function on and off.
//#define CONFIG_FEATURE_VI_CRASHME		// randomly pick commands to execute
#endif							/* STANDALONE */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <fcntl.h>
#include <signal.h>
#include <setjmp.h>
#include <regex.h>
#include <ctype.h>
#include <assert.h>
#include <errno.h>
#include <stdarg.h>
#ifndef STANDALONE
#include "busybox.h"
#endif							/* STANDALONE */

#ifndef TRUE
#define TRUE			((int)1)
#define FALSE			((int)0)
#endif							/* TRUE */
#define MAX_SCR_COLS		BUFSIZ

// Misc. non-Ascii keys that report an escape sequence
#define VI_K_UP			128	// cursor key Up
#define VI_K_DOWN		129	// cursor key Down
#define VI_K_RIGHT		130	// Cursor Key Right
#define VI_K_LEFT		131	// cursor key Left
#define VI_K_HOME		132	// Cursor Key Home
#define VI_K_END		133	// Cursor Key End
#define VI_K_INSERT		134	// Cursor Key Insert
#define VI_K_PAGEUP		135	// Cursor Key Page Up
#define VI_K_PAGEDOWN		136	// Cursor Key Page Down
#define VI_K_FUN1		137	// Function Key F1
#define VI_K_FUN2		138	// Function Key F2
#define VI_K_FUN3		139	// Function Key F3
#define VI_K_FUN4		140	// Function Key F4
#define VI_K_FUN5		141	// Function Key F5
#define VI_K_FUN6		142	// Function Key F6
#define VI_K_FUN7		143	// Function Key F7
#define VI_K_FUN8		144	// Function Key F8
#define VI_K_FUN9		145	// Function Key F9
#define VI_K_FUN10		146	// Function Key F10
#define VI_K_FUN11		147	// Function Key F11
#define VI_K_FUN12		148	// Function Key F12

static const int YANKONLY = FALSE;
static const int YANKDEL = TRUE;
static const int FORWARD = 1;	// code depends on "1"  for array index
static const int BACK = -1;	// code depends on "-1" for array index
static const int LIMITED = 0;	// how much of text[] in char_search
static const int FULL = 1;	// how much of text[] in char_search

static const int S_BEFORE_WS = 1;	// used in skip_thing() for moving "dot"
static const int S_TO_WS = 2;		// used in skip_thing() for moving "dot"
static const int S_OVER_WS = 3;		// used in skip_thing() for moving "dot"
static const int S_END_PUNCT = 4;	// used in skip_thing() for moving "dot"
static const int S_END_ALNUM = 5;	// used in skip_thing() for moving "dot"

typedef unsigned char Byte;


static int editing;		// >0 while we are editing a file
static int cmd_mode;		// 0=command  1=insert
static int file_modified;	// buffer contents changed
static int err_method;		// indicate error with beep or flash
static int fn_start;		// index of first cmd line file name
static int save_argc;		// how many file names on cmd line
static int cmdcnt;		// repetition count
static fd_set rfds;		// use select() for small sleeps
static struct timeval tv;	// use select() for small sleeps
static char erase_char;		// the users erase character
static int rows, columns;	// the terminal screen is this size
static int crow, ccol, offset;	// cursor is on Crow x Ccol with Horz Ofset
static char *SOs, *SOn;		// terminal standout start/normal ESC sequence
static char *bell;		// terminal bell sequence
static char *Ceol, *Ceos;	// Clear-end-of-line and Clear-end-of-screen ESC sequence
static char *CMrc;		// Cursor motion arbitrary destination ESC sequence
static char *CMup, *CMdown;	// Cursor motion up and down ESC sequence
static Byte *status_buffer;	// mesages to the user
static Byte last_input_char;	// last char read from user
static Byte last_forward_char;	// last char searched for with 'f'
static Byte *cfn;		// previous, current, and next file name
static Byte *text, *end, *textend;	// pointers to the user data in memory
static Byte *screen;		// pointer to the virtual screen buffer
static int screensize;		//            and its size
static Byte *screenbegin;	// index into text[], of top line on the screen
static Byte *dot;		// where all the action takes place
static int tabstop;
static struct termios term_orig, term_vi;	// remember what the cooked mode was

#ifdef CONFIG_FEATURE_VI_OPTIMIZE_CURSOR
static int last_row;		// where the cursor was last moved to
#endif							/* CONFIG_FEATURE_VI_OPTIMIZE_CURSOR */
#ifdef CONFIG_FEATURE_VI_USE_SIGNALS
static jmp_buf restart;		// catch_sig()
#endif							/* CONFIG_FEATURE_VI_USE_SIGNALS */
#ifdef CONFIG_FEATURE_VI_WIN_RESIZE
static struct winsize winsize;	// remember the window size
#endif							/* CONFIG_FEATURE_VI_WIN_RESIZE */
#ifdef CONFIG_FEATURE_VI_DOT_CMD
static int adding2q;		// are we currently adding user input to q
static Byte *last_modifying_cmd;	// last modifying cmd for "."
static Byte *ioq, *ioq_start;	// pointer to string for get_one_char to "read"
#endif							/* CONFIG_FEATURE_VI_DOT_CMD */
#if	defined(CONFIG_FEATURE_VI_DOT_CMD) || defined(CONFIG_FEATURE_VI_YANKMARK)
static Byte *modifying_cmds;	// cmds that modify text[]
#endif							/* CONFIG_FEATURE_VI_DOT_CMD || CONFIG_FEATURE_VI_YANKMARK */
#ifdef CONFIG_FEATURE_VI_READONLY
static int vi_readonly, readonly;
#endif							/* CONFIG_FEATURE_VI_READONLY */
#ifdef CONFIG_FEATURE_VI_SETOPTS
static int autoindent;
static int showmatch;
static int ignorecase;
#endif							/* CONFIG_FEATURE_VI_SETOPTS */
#ifdef CONFIG_FEATURE_VI_YANKMARK
static Byte *reg[28];		// named register a-z, "D", and "U" 0-25,26,27
static int YDreg, Ureg;		// default delete register and orig line for "U"
static Byte *mark[28];		// user marks points somewhere in text[]-  a-z and previous context ''
static Byte *context_start, *context_end;
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
#ifdef CONFIG_FEATURE_VI_SEARCH
static Byte *last_search_pattern;	// last pattern from a '/' or '?' search
#endif							/* CONFIG_FEATURE_VI_SEARCH */


static void edit_file(Byte *);	// edit one file
static void do_cmd(Byte);	// execute a command
static void sync_cursor(Byte *, int *, int *);	// synchronize the screen cursor to dot
static Byte *begin_line(Byte *);	// return pointer to cur line B-o-l
static Byte *end_line(Byte *);	// return pointer to cur line E-o-l
static Byte *dollar_line(Byte *);	// return pointer to just before NL
static Byte *prev_line(Byte *);	// return pointer to prev line B-o-l
static Byte *next_line(Byte *);	// return pointer to next line B-o-l
static Byte *end_screen(void);	// get pointer to last char on screen
static int count_lines(Byte *, Byte *);	// count line from start to stop
static Byte *find_line(int);	// find begining of line #li
static Byte *move_to_col(Byte *, int);	// move "p" to column l
static int isblnk(Byte);	// is the char a blank or tab
static void dot_left(void);	// move dot left- dont leave line
static void dot_right(void);	// move dot right- dont leave line
static void dot_begin(void);	// move dot to B-o-l
static void dot_end(void);	// move dot to E-o-l
static void dot_next(void);	// move dot to next line B-o-l
static void dot_prev(void);	// move dot to prev line B-o-l
static void dot_scroll(int, int);	// move the screen up or down
static void dot_skip_over_ws(void);	// move dot pat WS
static void dot_delete(void);	// delete the char at 'dot'
static Byte *bound_dot(Byte *);	// make sure  text[0] <= P < "end"
static Byte *new_screen(int, int);	// malloc virtual screen memory
static Byte *new_text(int);	// malloc memory for text[] buffer
static Byte *char_insert(Byte *, Byte);	// insert the char c at 'p'
static Byte *stupid_insert(Byte *, Byte);	// stupidly insert the char c at 'p'
static Byte find_range(Byte **, Byte **, Byte);	// return pointers for an object
static int st_test(Byte *, int, int, Byte *);	// helper for skip_thing()
static Byte *skip_thing(Byte *, int, int, int);	// skip some object
static Byte *find_pair(Byte *, Byte);	// find matching pair ()  []  {}
static Byte *text_hole_delete(Byte *, Byte *);	// at "p", delete a 'size' byte hole
static Byte *text_hole_make(Byte *, int);	// at "p", make a 'size' byte hole
static Byte *yank_delete(Byte *, Byte *, int, int);	// yank text[] into register then delete
static void show_help(void);	// display some help info
static void print_literal(Byte *, Byte *);	// copy s to buf, convert unprintable
static void rawmode(void);	// set "raw" mode on tty
static void cookmode(void);	// return to "cooked" mode on tty
static int mysleep(int);	// sleep for 'h' 1/100 seconds
static Byte readit(void);	// read (maybe cursor) key from stdin
static Byte get_one_char(void);	// read 1 char from stdin
static int file_size(Byte *);	// what is the byte size of "fn"
static int file_insert(Byte *, Byte *, int);
static int file_write(Byte *, Byte *, Byte *);
static void place_cursor(int, int, int);
static void screen_erase(void);
static void clear_to_eol(void);
static void clear_to_eos(void);
static void standout_start(void);	// send "start reverse video" sequence
static void standout_end(void);	// send "end reverse video" sequence
static void flash(int);		// flash the terminal screen
static void beep(void);		// beep the terminal
static void indicate_error(char);	// use flash or beep to indicate error
static void show_status_line(void);	// put a message on the bottom line
static void psb(char *, ...);	// Print Status Buf
static void psbs(char *, ...);	// Print Status Buf in standout mode
static void ni(Byte *);		// display messages
static void edit_status(void);	// show file status on status line
static void redraw(int);	// force a full screen refresh
static void format_line(Byte*, Byte*, int);
static void refresh(int);	// update the terminal from screen[]

#ifdef CONFIG_FEATURE_VI_SEARCH
static Byte *char_search(Byte *, Byte *, int, int);	// search for pattern starting at p
static int mycmp(Byte *, Byte *, int);	// string cmp based in "ignorecase"
#endif							/* CONFIG_FEATURE_VI_SEARCH */
#ifdef CONFIG_FEATURE_VI_COLON
static void Hit_Return(void);
static Byte *get_one_address(Byte *, int *);	// get colon addr, if present
static Byte *get_address(Byte *, int *, int *);	// get two colon addrs, if present
static void colon(Byte *);	// execute the "colon" mode cmds
#endif							/* CONFIG_FEATURE_VI_COLON */
static Byte *get_input_line(Byte *);	// get input line- use "status line"
#ifdef CONFIG_FEATURE_VI_USE_SIGNALS
static void winch_sig(int);	// catch window size changes
static void suspend_sig(int);	// catch ctrl-Z
static void alarm_sig(int);	// catch alarm time-outs
static void catch_sig(int);	// catch ctrl-C
static void core_sig(int);	// catch a core dump signal
#endif							/* CONFIG_FEATURE_VI_USE_SIGNALS */
#ifdef CONFIG_FEATURE_VI_DOT_CMD
static void start_new_cmd_q(Byte);	// new queue for command
static void end_cmd_q(void);	// stop saving input chars
#else							/* CONFIG_FEATURE_VI_DOT_CMD */
#define end_cmd_q()
#endif							/* CONFIG_FEATURE_VI_DOT_CMD */
#ifdef CONFIG_FEATURE_VI_WIN_RESIZE
static void window_size_get(int);	// find out what size the window is
#endif							/* CONFIG_FEATURE_VI_WIN_RESIZE */
#ifdef CONFIG_FEATURE_VI_SETOPTS
static void showmatching(Byte *);	// show the matching pair ()  []  {}
#endif							/* CONFIG_FEATURE_VI_SETOPTS */
#if defined(CONFIG_FEATURE_VI_YANKMARK) || defined(CONFIG_FEATURE_VI_COLON) || defined(CONFIG_FEATURE_VI_CRASHME)
static Byte *string_insert(Byte *, Byte *);	// insert the string at 'p'
#endif							/* CONFIG_FEATURE_VI_YANKMARK || CONFIG_FEATURE_VI_COLON || CONFIG_FEATURE_VI_CRASHME */
#ifdef CONFIG_FEATURE_VI_YANKMARK
static Byte *text_yank(Byte *, Byte *, int);	// save copy of "p" into a register
static Byte what_reg(void);		// what is letter of current YDreg
static void check_context(Byte);	// remember context for '' command
static Byte *swap_context(Byte *);	// goto new context for '' command
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
#ifdef CONFIG_FEATURE_VI_CRASHME
static void crash_dummy();
static void crash_test();
static int crashme = 0;
#endif							/* CONFIG_FEATURE_VI_CRASHME */


extern int vi_main(int argc, char **argv)
{
	int c;

#ifdef CONFIG_FEATURE_VI_YANKMARK
	int i;
#endif							/* CONFIG_FEATURE_VI_YANKMARK */

	CMrc= "\033[%d;%dH";	// Terminal Crusor motion ESC sequence
	CMup= "\033[A";		// move cursor up one line, same col
	CMdown="\n";		// move cursor down one line, same col
	Ceol= "\033[0K";	// Clear from cursor to end of line
	Ceos= "\033[0J";	// Clear from cursor to end of screen
	SOs = "\033[7m";	// Terminal standout mode on
	SOn = "\033[0m";	// Terminal standout mode off
	bell= "\007";		// Terminal bell sequence
#ifdef CONFIG_FEATURE_VI_CRASHME
	(void) srand((long) getpid());
#endif							/* CONFIG_FEATURE_VI_CRASHME */
	status_buffer = (Byte *) xmalloc(200);	// hold messages to user
#ifdef CONFIG_FEATURE_VI_READONLY
	vi_readonly = readonly = FALSE;
	if (strncmp(argv[0], "view", 4) == 0) {
		readonly = TRUE;
		vi_readonly = TRUE;
	}
#endif							/* CONFIG_FEATURE_VI_READONLY */
#ifdef CONFIG_FEATURE_VI_SETOPTS
	autoindent = 1;
	ignorecase = 1;
	showmatch = 1;
#endif							/* CONFIG_FEATURE_VI_SETOPTS */
#ifdef CONFIG_FEATURE_VI_YANKMARK
	for (i = 0; i < 28; i++) {
		reg[i] = 0;
	}					// init the yank regs
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
#if defined(CONFIG_FEATURE_VI_DOT_CMD) || defined(CONFIG_FEATURE_VI_YANKMARK)
	modifying_cmds = (Byte *) "aAcCdDiIJoOpPrRsxX<>~";	// cmds modifying text[]
#endif							/* CONFIG_FEATURE_VI_DOT_CMD */

	//  1-  process $HOME/.exrc file
	//  2-  process EXINIT variable from environment
	//  3-  process command line args
	while ((c = getopt(argc, argv, "hCR")) != -1) {
		switch (c) {
#ifdef CONFIG_FEATURE_VI_CRASHME
		case 'C':
			crashme = 1;
			break;
#endif							/* CONFIG_FEATURE_VI_CRASHME */
#ifdef CONFIG_FEATURE_VI_READONLY
		case 'R':		// Read-only flag
			readonly = TRUE;
			break;
#endif							/* CONFIG_FEATURE_VI_READONLY */
			//case 'r':	// recover flag-  ignore- we don't use tmp file
			//case 'x':	// encryption flag- ignore
			//case 'c':	// execute command first
			//case 'h':	// help -- just use default
		default:
			show_help();
			return 1;
		}
	}

	// The argv array can be used by the ":next"  and ":rewind" commands
	// save optind.
	fn_start = optind;	// remember first file name for :next and :rew
	save_argc = argc;

	//----- This is the main file handling loop --------------
	if (optind >= argc) {
		editing = 1;	// 0= exit,  1= one file,  2= multiple files
		edit_file(0);
	} else {
		for (; optind < argc; optind++) {
			editing = 1;	// 0=exit, 1=one file, 2+ =many files
			if (cfn != 0)
				free(cfn);
			cfn = (Byte *) xstrdup(argv[optind]);
			edit_file(cfn);
		}
	}
	//-----------------------------------------------------------

	return (0);
}

static void edit_file(Byte * fn)
{
	char c;
	int cnt, size, ch;

#ifdef CONFIG_FEATURE_VI_USE_SIGNALS
	char *msg;
	int sig;
#endif							/* CONFIG_FEATURE_VI_USE_SIGNALS */
#ifdef CONFIG_FEATURE_VI_YANKMARK
	static Byte *cur_line;
#endif							/* CONFIG_FEATURE_VI_YANKMARK */

	rawmode();
	rows = 24;
	columns = 80;
	ch= -1;
#ifdef CONFIG_FEATURE_VI_WIN_RESIZE
	window_size_get(0);
#endif							/* CONFIG_FEATURE_VI_WIN_RESIZE */
	new_screen(rows, columns);	// get memory for virtual screen

	cnt = file_size(fn);	// file size
	size = 2 * cnt;		// 200% of file size
	new_text(size);		// get a text[] buffer
	screenbegin = dot = end = text;
	if (fn != 0) {
		ch= file_insert(fn, text, cnt);
	}
	if (ch < 1) {
		(void) char_insert(text, '\n');	// start empty buf with dummy line
	}
	file_modified = FALSE;
#ifdef CONFIG_FEATURE_VI_YANKMARK
	YDreg = 26;			// default Yank/Delete reg
	Ureg = 27;			// hold orig line for "U" cmd
	for (cnt = 0; cnt < 28; cnt++) {
		mark[cnt] = 0;
	}					// init the marks
	mark[26] = mark[27] = text;	// init "previous context"
#endif							/* CONFIG_FEATURE_VI_YANKMARK */

	err_method = 1;		// flash
	last_forward_char = last_input_char = '\0';
	crow = 0;
	ccol = 0;
	edit_status();

#ifdef CONFIG_FEATURE_VI_USE_SIGNALS
	signal(SIGHUP, catch_sig);
	signal(SIGINT, catch_sig);
	signal(SIGALRM, alarm_sig);
	signal(SIGTERM, catch_sig);
	signal(SIGQUIT, core_sig);
	signal(SIGILL, core_sig);
	signal(SIGTRAP, core_sig);
	signal(SIGIOT, core_sig);
	signal(SIGABRT, core_sig);
	signal(SIGFPE, core_sig);
	signal(SIGBUS, core_sig);
	signal(SIGSEGV, core_sig);
#ifdef SIGSYS
	signal(SIGSYS, core_sig);
#endif	
	signal(SIGWINCH, winch_sig);
	signal(SIGTSTP, suspend_sig);
	sig = setjmp(restart);
	if (sig != 0) {
		msg = "";
		if (sig == SIGWINCH)
			msg = "(window resize)";
		if (sig == SIGHUP)
			msg = "(hangup)";
		if (sig == SIGINT)
			msg = "(interrupt)";
		if (sig == SIGTERM)
			msg = "(terminate)";
		if (sig == SIGBUS)
			msg = "(bus error)";
		if (sig == SIGSEGV)
			msg = "(I tried to touch invalid memory)";
		if (sig == SIGALRM)
			msg = "(alarm)";

		psbs("-- caught signal %d %s--", sig, msg);
		screenbegin = dot = text;
	}
#endif							/* CONFIG_FEATURE_VI_USE_SIGNALS */

	editing = 1;
	cmd_mode = 0;		// 0=command  1=insert  2='R'eplace
	cmdcnt = 0;
	tabstop = 8;
	offset = 0;			// no horizontal offset
	c = '\0';
#ifdef CONFIG_FEATURE_VI_DOT_CMD
	if (last_modifying_cmd != 0)
		free(last_modifying_cmd);
	if (ioq_start != NULL)
		free(ioq_start);
	ioq = ioq_start = last_modifying_cmd = 0;
	adding2q = 0;
#endif							/* CONFIG_FEATURE_VI_DOT_CMD */
	redraw(FALSE);			// dont force every col re-draw
	show_status_line();

	//------This is the main Vi cmd handling loop -----------------------
	while (editing > 0) {
#ifdef CONFIG_FEATURE_VI_CRASHME
		if (crashme > 0) {
			if ((end - text) > 1) {
				crash_dummy();	// generate a random command
			} else {
				crashme = 0;
				dot =
					string_insert(text, (Byte *) "\n\n#####  Ran out of text to work on.  #####\n\n");	// insert the string
				refresh(FALSE);
			}
		}
#endif							/* CONFIG_FEATURE_VI_CRASHME */
		last_input_char = c = get_one_char();	// get a cmd from user
#ifdef CONFIG_FEATURE_VI_YANKMARK
		// save a copy of the current line- for the 'U" command
		if (begin_line(dot) != cur_line) {
			cur_line = begin_line(dot);
			text_yank(begin_line(dot), end_line(dot), Ureg);
		}
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
#ifdef CONFIG_FEATURE_VI_DOT_CMD
		// These are commands that change text[].
		// Remember the input for the "." command
		if (!adding2q && ioq_start == 0
			&& strchr((char *) modifying_cmds, c) != NULL) {
			start_new_cmd_q(c);
		}
#endif							/* CONFIG_FEATURE_VI_DOT_CMD */
		do_cmd(c);		// execute the user command
		//
		// poll to see if there is input already waiting. if we are
		// not able to display output fast enough to keep up, skip
		// the display update until we catch up with input.
		if (mysleep(0) == 0) {
			// no input pending- so update output
			refresh(FALSE);
			show_status_line();
		}
#ifdef CONFIG_FEATURE_VI_CRASHME
		if (crashme > 0)
			crash_test();	// test editor variables
#endif							/* CONFIG_FEATURE_VI_CRASHME */
	}
	//-------------------------------------------------------------------

	place_cursor(rows, 0, FALSE);	// go to bottom of screen
	clear_to_eol();		// Erase to end of line
	cookmode();
}

static Byte readbuffer[BUFSIZ];

#ifdef CONFIG_FEATURE_VI_CRASHME
static int totalcmds = 0;
static int Mp = 85;		// Movement command Probability
static int Np = 90;		// Non-movement command Probability
static int Dp = 96;		// Delete command Probability
static int Ip = 97;		// Insert command Probability
static int Yp = 98;		// Yank command Probability
static int Pp = 99;		// Put command Probability
static int M = 0, N = 0, I = 0, D = 0, Y = 0, P = 0, U = 0;
char chars[20] = "\t012345 abcdABCD-=.$";
char *words[20] = { "this", "is", "a", "test",
	"broadcast", "the", "emergency", "of",
	"system", "quick", "brown", "fox",
	"jumped", "over", "lazy", "dogs",
	"back", "January", "Febuary", "March"
};
char *lines[20] = {
	"You should have received a copy of the GNU General Public License\n",
	"char c, cm, *cmd, *cmd1;\n",
	"generate a command by percentages\n",
	"Numbers may be typed as a prefix to some commands.\n",
	"Quit, discarding changes!\n",
	"Forced write, if permission originally not valid.\n",
	"In general, any ex or ed command (such as substitute or delete).\n",
	"I have tickets available for the Blazers vs LA Clippers for Monday, Janurary 1 at 1:00pm.\n",
	"Please get w/ me and I will go over it with you.\n",
	"The following is a list of scheduled, committed changes.\n",
	"1.   Launch Norton Antivirus (Start, Programs, Norton Antivirus)\n",
	"Reminder....Town Meeting in Central Perk cafe today at 3:00pm.\n",
	"Any question about transactions please contact Sterling Huxley.\n",
	"I will try to get back to you by Friday, December 31.\n",
	"This Change will be implemented on Friday.\n",
	"Let me know if you have problems accessing this;\n",
	"Sterling Huxley recently added you to the access list.\n",
	"Would you like to go to lunch?\n",
	"The last command will be automatically run.\n",
	"This is too much english for a computer geek.\n",
};
char *multilines[20] = {
	"You should have received a copy of the GNU General Public License\n",
	"char c, cm, *cmd, *cmd1;\n",
	"generate a command by percentages\n",
	"Numbers may be typed as a prefix to some commands.\n",
	"Quit, discarding changes!\n",
	"Forced write, if permission originally not valid.\n",
	"In general, any ex or ed command (such as substitute or delete).\n",
	"I have tickets available for the Blazers vs LA Clippers for Monday, Janurary 1 at 1:00pm.\n",
	"Please get w/ me and I will go over it with you.\n",
	"The following is a list of scheduled, committed changes.\n",
	"1.   Launch Norton Antivirus (Start, Programs, Norton Antivirus)\n",
	"Reminder....Town Meeting in Central Perk cafe today at 3:00pm.\n",
	"Any question about transactions please contact Sterling Huxley.\n",
	"I will try to get back to you by Friday, December 31.\n",
	"This Change will be implemented on Friday.\n",
	"Let me know if you have problems accessing this;\n",
	"Sterling Huxley recently added you to the access list.\n",
	"Would you like to go to lunch?\n",
	"The last command will be automatically run.\n",
	"This is too much english for a computer geek.\n",
};

// create a random command to execute
static void crash_dummy()
{
	static int sleeptime;	// how long to pause between commands
	char c, cm, *cmd, *cmd1;
	int i, cnt, thing, rbi, startrbi, percent;

	// "dot" movement commands
	cmd1 = " \n\r\002\004\005\006\025\0310^$-+wWeEbBhjklHL";

	// is there already a command running?
	if (strlen((char *) readbuffer) > 0)
		goto cd1;
  cd0:
	startrbi = rbi = 0;
	sleeptime = 0;		// how long to pause between commands
	memset(readbuffer, '\0', BUFSIZ - 1);	// clear the read buffer
	// generate a command by percentages
	percent = (int) lrand48() % 100;	// get a number from 0-99
	if (percent < Mp) {	//  Movement commands
		// available commands
		cmd = cmd1;
		M++;
	} else if (percent < Np) {	//  non-movement commands
		cmd = "mz<>\'\"";	// available commands
		N++;
	} else if (percent < Dp) {	//  Delete commands
		cmd = "dx";		// available commands
		D++;
	} else if (percent < Ip) {	//  Inset commands
		cmd = "iIaAsrJ";	// available commands
		I++;
	} else if (percent < Yp) {	//  Yank commands
		cmd = "yY";		// available commands
		Y++;
	} else if (percent < Pp) {	//  Put commands
		cmd = "pP";		// available commands
		P++;
	} else {
		// We do not know how to handle this command, try again
		U++;
		goto cd0;
	}
	// randomly pick one of the available cmds from "cmd[]"
	i = (int) lrand48() % strlen(cmd);
	cm = cmd[i];
	if (strchr(":\024", cm))
		goto cd0;		// dont allow colon or ctrl-T commands
	readbuffer[rbi++] = cm;	// put cmd into input buffer

	// now we have the command-
	// there are 1, 2, and multi char commands
	// find out which and generate the rest of command as necessary
	if (strchr("dmryz<>\'\"", cm)) {	// 2-char commands
		cmd1 = " \n\r0$^-+wWeEbBhjklHL";
		if (cm == 'm' || cm == '\'' || cm == '\"') {	// pick a reg[]
			cmd1 = "abcdefghijklmnopqrstuvwxyz";
		}
		thing = (int) lrand48() % strlen(cmd1);	// pick a movement command
		c = cmd1[thing];
		readbuffer[rbi++] = c;	// add movement to input buffer
	}
	if (strchr("iIaAsc", cm)) {	// multi-char commands
		if (cm == 'c') {
			// change some thing
			thing = (int) lrand48() % strlen(cmd1);	// pick a movement command
			c = cmd1[thing];
			readbuffer[rbi++] = c;	// add movement to input buffer
		}
		thing = (int) lrand48() % 4;	// what thing to insert
		cnt = (int) lrand48() % 10;	// how many to insert
		for (i = 0; i < cnt; i++) {
			if (thing == 0) {	// insert chars
				readbuffer[rbi++] = chars[((int) lrand48() % strlen(chars))];
			} else if (thing == 1) {	// insert words
				strcat((char *) readbuffer, words[(int) lrand48() % 20]);
				strcat((char *) readbuffer, " ");
				sleeptime = 0;	// how fast to type
			} else if (thing == 2) {	// insert lines
				strcat((char *) readbuffer, lines[(int) lrand48() % 20]);
				sleeptime = 0;	// how fast to type
			} else {	// insert multi-lines
				strcat((char *) readbuffer, multilines[(int) lrand48() % 20]);
				sleeptime = 0;	// how fast to type
			}
		}
		strcat((char *) readbuffer, "\033");
	}
  cd1:
	totalcmds++;
	if (sleeptime > 0)
		(void) mysleep(sleeptime);	// sleep 1/100 sec
}

// test to see if there are any errors
static void crash_test()
{
	static time_t oldtim;
	time_t tim;
	char d[2], buf[BUFSIZ], msg[BUFSIZ];

	msg[0] = '\0';
	if (end < text) {
		strcat((char *) msg, "end<text ");
	}
	if (end > textend) {
		strcat((char *) msg, "end>textend ");
	}
	if (dot < text) {
		strcat((char *) msg, "dot<text ");
	}
	if (dot > end) {
		strcat((char *) msg, "dot>end ");
	}
	if (screenbegin < text) {
		strcat((char *) msg, "screenbegin<text ");
	}
	if (screenbegin > end - 1) {
		strcat((char *) msg, "screenbegin>end-1 ");
	}

	if (strlen(msg) > 0) {
		alarm(0);
		sprintf(buf, "\n\n%d: \'%c\' %s\n\n\n%s[Hit return to continue]%s",
			totalcmds, last_input_char, msg, SOs, SOn);
		write(1, buf, strlen(buf));
		while (read(0, d, 1) > 0) {
			if (d[0] == '\n' || d[0] == '\r')
				break;
		}
		alarm(3);
	}
	tim = (time_t) time((time_t *) 0);
	if (tim >= (oldtim + 3)) {
		sprintf((char *) status_buffer,
				"Tot=%d: M=%d N=%d I=%d D=%d Y=%d P=%d U=%d size=%d",
				totalcmds, M, N, I, D, Y, P, U, end - text + 1);
		oldtim = tim;
	}
	return;
}
#endif							/* CONFIG_FEATURE_VI_CRASHME */

//---------------------------------------------------------------------
//----- the Ascii Chart -----------------------------------------------
//
//  00 nul   01 soh   02 stx   03 etx   04 eot   05 enq   06 ack   07 bel
//  08 bs    09 ht    0a nl    0b vt    0c np    0d cr    0e so    0f si
//  10 dle   11 dc1   12 dc2   13 dc3   14 dc4   15 nak   16 syn   17 etb
//  18 can   19 em    1a sub   1b esc   1c fs    1d gs    1e rs    1f us
//  20 sp    21 !     22 "     23 #     24 $     25 %     26 &     27 '
//  28 (     29 )     2a *     2b +     2c ,     2d -     2e .     2f /
//  30 0     31 1     32 2     33 3     34 4     35 5     36 6     37 7
//  38 8     39 9     3a :     3b ;     3c <     3d =     3e >     3f ?
//  40 @     41 A     42 B     43 C     44 D     45 E     46 F     47 G
//  48 H     49 I     4a J     4b K     4c L     4d M     4e N     4f O
//  50 P     51 Q     52 R     53 S     54 T     55 U     56 V     57 W
//  58 X     59 Y     5a Z     5b [     5c \     5d ]     5e ^     5f _
//  60 `     61 a     62 b     63 c     64 d     65 e     66 f     67 g
//  68 h     69 i     6a j     6b k     6c l     6d m     6e n     6f o
//  70 p     71 q     72 r     73 s     74 t     75 u     76 v     77 w
//  78 x     79 y     7a z     7b {     7c |     7d }     7e ~     7f del
//---------------------------------------------------------------------

//----- Execute a Vi Command -----------------------------------
static void do_cmd(Byte c)
{
	Byte c1, *p, *q, *msg, buf[9], *save_dot;
	int cnt, i, j, dir, yf;

	c1 = c;				// quiet the compiler
	cnt = yf = dir = 0;	// quiet the compiler
	p = q = save_dot = msg = buf;	// quiet the compiler
	memset(buf, '\0', 9);	// clear buf

	/* if this is a cursor key, skip these checks */
	switch (c) {
		case VI_K_UP:
		case VI_K_DOWN:
		case VI_K_LEFT:
		case VI_K_RIGHT:
		case VI_K_HOME:
		case VI_K_END:
		case VI_K_PAGEUP:
		case VI_K_PAGEDOWN:
			goto key_cmd_mode;
	}

	if (cmd_mode == 2) {
		// we are 'R'eplacing the current *dot with new char
		if (*dot == '\n') {
			// don't Replace past E-o-l
			cmd_mode = 1;	// convert to insert
		} else {
			if (1 <= c && c <= 127) {	// only ASCII chars
				if (c != 27)
					dot = yank_delete(dot, dot, 0, YANKDEL);	// delete char
				dot = char_insert(dot, c);	// insert new char
			}
			goto dc1;
		}
	}
	if (cmd_mode == 1) {
		//  hitting "Insert" twice means "R" replace mode
		if (c == VI_K_INSERT) goto dc5;
		// insert the char c at "dot"
		if (1 <= c && c <= 127) {
			dot = char_insert(dot, c);	// only ASCII chars
		}
		goto dc1;
	}

key_cmd_mode:
	switch (c) {
		//case 0x01:	// soh
		//case 0x09:	// ht
		//case 0x0b:	// vt
		//case 0x0e:	// so
		//case 0x0f:	// si
		//case 0x10:	// dle
		//case 0x11:	// dc1
		//case 0x13:	// dc3
#ifdef CONFIG_FEATURE_VI_CRASHME
	case 0x14:			// dc4  ctrl-T
		crashme = (crashme == 0) ? 1 : 0;
		break;
#endif							/* CONFIG_FEATURE_VI_CRASHME */
		//case 0x16:	// syn
		//case 0x17:	// etb
		//case 0x18:	// can
		//case 0x1c:	// fs
		//case 0x1d:	// gs
		//case 0x1e:	// rs
		//case 0x1f:	// us
		//case '!':	// !- 
		//case '#':	// #- 
		//case '&':	// &- 
		//case '(':	// (- 
		//case ')':	// )- 
		//case '*':	// *- 
		//case ',':	// ,- 
		//case '=':	// =- 
		//case '@':	// @- 
		//case 'F':	// F- 
		//case 'K':	// K- 
		//case 'Q':	// Q- 
		//case 'S':	// S- 
		//case 'T':	// T- 
		//case 'V':	// V- 
		//case '[':	// [- 
		//case '\\':	// \- 
		//case ']':	// ]- 
		//case '_':	// _- 
		//case '`':	// `- 
		//case 'g':	// g- 
		//case 'u':	// u- FIXME- there is no undo
		//case 'v':	// v- 
	default:			// unrecognised command
		buf[0] = c;
		buf[1] = '\0';
		if (c <= ' ') {
			buf[0] = '^';
			buf[1] = c + '@';
			buf[2] = '\0';
		}
		ni((Byte *) buf);
		end_cmd_q();	// stop adding to q
	case 0x00:			// nul- ignore
		break;
	case 2:			// ctrl-B  scroll up   full screen
	case VI_K_PAGEUP:	// Cursor Key Page Up
		dot_scroll(rows - 2, -1);
		break;
#ifdef CONFIG_FEATURE_VI_USE_SIGNALS
	case 0x03:			// ctrl-C   interrupt
		longjmp(restart, 1);
		break;
	case 26:			// ctrl-Z suspend
		suspend_sig(SIGTSTP);
		break;
#endif							/* CONFIG_FEATURE_VI_USE_SIGNALS */
	case 4:			// ctrl-D  scroll down half screen
		dot_scroll((rows - 2) / 2, 1);
		break;
	case 5:			// ctrl-E  scroll down one line
		dot_scroll(1, 1);
		break;
	case 6:			// ctrl-F  scroll down full screen
	case VI_K_PAGEDOWN:	// Cursor Key Page Down
		dot_scroll(rows - 2, 1);
		break;
	case 7:			// ctrl-G  show current status
		edit_status();
		break;
	case 'h':			// h- move left
	case VI_K_LEFT:	// cursor key Left
	case 8:			// ctrl-H- move left    (This may be ERASE char)
	case 127:			// DEL- move left   (This may be ERASE char)
		if (cmdcnt-- > 1) {
			do_cmd(c);
		}				// repeat cnt
		dot_left();
		break;
	case 10:			// Newline ^J
	case 'j':			// j- goto next line, same col
	case VI_K_DOWN:	// cursor key Down
		if (cmdcnt-- > 1) {
			do_cmd(c);
		}				// repeat cnt
		dot_next();		// go to next B-o-l
		dot = move_to_col(dot, ccol + offset);	// try stay in same col
		break;
	case 12:			// ctrl-L  force redraw whole screen
	case 18:			// ctrl-R  force redraw
		place_cursor(0, 0, FALSE);	// put cursor in correct place
		clear_to_eos();	// tel terminal to erase display
		(void) mysleep(10);
		screen_erase();	// erase the internal screen buffer
		refresh(TRUE);	// this will redraw the entire display
		break;
	case 13:			// Carriage Return ^M
	case '+':			// +- goto next line
		if (cmdcnt-- > 1) {
			do_cmd(c);
		}				// repeat cnt
		dot_next();
		dot_skip_over_ws();
		break;
	case 21:			// ctrl-U  scroll up   half screen
		dot_scroll((rows - 2) / 2, -1);
		break;
	case 25:			// ctrl-Y  scroll up one line
		dot_scroll(1, -1);
		break;
	case 27:			// esc
		if (cmd_mode == 0)
			indicate_error(c);
		cmd_mode = 0;	// stop insrting
		end_cmd_q();
		*status_buffer = '\0';	// clear status buffer
		break;
	case ' ':			// move right
	case 'l':			// move right
	case VI_K_RIGHT:	// Cursor Key Right
		if (cmdcnt-- > 1) {
			do_cmd(c);
		}				// repeat cnt
		dot_right();
		break;
#ifdef CONFIG_FEATURE_VI_YANKMARK
	case '"':			// "- name a register to use for Delete/Yank
		c1 = get_one_char();
		c1 = tolower(c1);
		if (islower(c1)) {
			YDreg = c1 - 'a';
		} else {
			indicate_error(c);
		}
		break;
	case '\'':			// '- goto a specific mark
		c1 = get_one_char();
		c1 = tolower(c1);
		if (islower(c1)) {
			c1 = c1 - 'a';
			// get the b-o-l
			q = mark[(int) c1];
			if (text <= q && q < end) {
				dot = q;
				dot_begin();	// go to B-o-l
				dot_skip_over_ws();
			}
		} else if (c1 == '\'') {	// goto previous context
			dot = swap_context(dot);	// swap current and previous context
			dot_begin();	// go to B-o-l
			dot_skip_over_ws();
		} else {
			indicate_error(c);
		}
		break;
	case 'm':			// m- Mark a line
		// this is really stupid.  If there are any inserts or deletes
		// between text[0] and dot then this mark will not point to the
		// correct location! It could be off by many lines!
		// Well..., at least its quick and dirty.
		c1 = get_one_char();
		c1 = tolower(c1);
		if (islower(c1)) {
			c1 = c1 - 'a';
			// remember the line
			mark[(int) c1] = dot;
		} else {
			indicate_error(c);
		}
		break;
	case 'P':			// P- Put register before
	case 'p':			// p- put register after
		p = reg[YDreg];
		if (p == 0) {
			psbs("Nothing in register %c", what_reg());
			break;
		}
		// are we putting whole lines or strings
		if (strchr((char *) p, '\n') != NULL) {
			if (c == 'P') {
				dot_begin();	// putting lines- Put above
			}
			if (c == 'p') {
				// are we putting after very last line?
				if (end_line(dot) == (end - 1)) {
					dot = end;	// force dot to end of text[]
				} else {
					dot_next();	// next line, then put before
				}
			}
		} else {
			if (c == 'p')
				dot_right();	// move to right, can move to NL
		}
		dot = string_insert(dot, p);	// insert the string
		end_cmd_q();	// stop adding to q
		break;
	case 'U':			// U- Undo; replace current line with original version
		if (reg[Ureg] != 0) {
			p = begin_line(dot);
			q = end_line(dot);
			p = text_hole_delete(p, q);	// delete cur line
			p = string_insert(p, reg[Ureg]);	// insert orig line
			dot = p;
			dot_skip_over_ws();
		}
		break;
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
	case '$':			// $- goto end of line
	case VI_K_END:		// Cursor Key End
		if (cmdcnt-- > 1) {
			do_cmd(c);
		}				// repeat cnt
		dot = end_line(dot + 1);
		break;
	case '%':			// %- find matching char of pair () [] {}
		for (q = dot; q < end && *q != '\n'; q++) {
			if (strchr("()[]{}", *q) != NULL) {
				// we found half of a pair
				p = find_pair(q, *q);
				if (p == NULL) {
					indicate_error(c);
				} else {
					dot = p;
				}
				break;
			}
		}
		if (*q == '\n')
			indicate_error(c);
		break;
	case 'f':			// f- forward to a user specified char
		last_forward_char = get_one_char();	// get the search char
		//
		// dont seperate these two commands. 'f' depends on ';'
		//
		//**** fall thru to ... 'i'
	case ';':			// ;- look at rest of line for last forward char
		if (cmdcnt-- > 1) {
			do_cmd(';');
		}				// repeat cnt
		if (last_forward_char == 0) break;
		q = dot + 1;
		while (q < end - 1 && *q != '\n' && *q != last_forward_char) {
			q++;
		}
		if (*q == last_forward_char)
			dot = q;
		break;
	case '-':			// -- goto prev line
		if (cmdcnt-- > 1) {
			do_cmd(c);
		}				// repeat cnt
		dot_prev();
		dot_skip_over_ws();
		break;
#ifdef CONFIG_FEATURE_VI_DOT_CMD
	case '.':			// .- repeat the last modifying command
		// Stuff the last_modifying_cmd back into stdin
		// and let it be re-executed.
		if (last_modifying_cmd != 0) {
			ioq = ioq_start = (Byte *) xstrdup((char *) last_modifying_cmd);
		}
		break;
#endif							/* CONFIG_FEATURE_VI_DOT_CMD */
#ifdef CONFIG_FEATURE_VI_SEARCH
	case '?':			// /- search for a pattern
	case '/':			// /- search for a pattern
		buf[0] = c;
		buf[1] = '\0';
		q = get_input_line(buf);	// get input line- use "status line"
		if (strlen((char *) q) == 1)
			goto dc3;	// if no pat re-use old pat
		if (strlen((char *) q) > 1) {	// new pat- save it and find
			// there is a new pat
			if (last_search_pattern != 0) {
				free(last_search_pattern);
			}
			last_search_pattern = (Byte *) xstrdup((char *) q);
			goto dc3;	// now find the pattern
		}
		// user changed mind and erased the "/"-  do nothing
		break;
	case 'N':			// N- backward search for last pattern
		if (cmdcnt-- > 1) {
			do_cmd(c);
		}				// repeat cnt
		dir = BACK;		// assume BACKWARD search
		p = dot - 1;
		if (last_search_pattern[0] == '?') {
			dir = FORWARD;
			p = dot + 1;
		}
		goto dc4;		// now search for pattern
		break;
	case 'n':			// n- repeat search for last pattern
		// search rest of text[] starting at next char
		// if search fails return orignal "p" not the "p+1" address
		if (cmdcnt-- > 1) {
			do_cmd(c);
		}				// repeat cnt
	  dc3:
		if (last_search_pattern == 0) {
			msg = (Byte *) "No previous regular expression";
			goto dc2;
		}
		if (last_search_pattern[0] == '/') {
			dir = FORWARD;	// assume FORWARD search
			p = dot + 1;
		}
		if (last_search_pattern[0] == '?') {
			dir = BACK;
			p = dot - 1;
		}
	  dc4:
		q = char_search(p, last_search_pattern + 1, dir, FULL);
		if (q != NULL) {
			dot = q;	// good search, update "dot"
			msg = (Byte *) "";
			goto dc2;
		}
		// no pattern found between "dot" and "end"- continue at top
		p = text;
		if (dir == BACK) {
			p = end - 1;
		}
		q = char_search(p, last_search_pattern + 1, dir, FULL);
		if (q != NULL) {	// found something
			dot = q;	// found new pattern- goto it
			msg = (Byte *) "search hit BOTTOM, continuing at TOP";
			if (dir == BACK) {
				msg = (Byte *) "search hit TOP, continuing at BOTTOM";
			}
		} else {
			msg = (Byte *) "Pattern not found";
		}
	  dc2:
		psbs("%s", msg);
		break;
	case '{':			// {- move backward paragraph
		q = char_search(dot, (Byte *) "\n\n", BACK, FULL);
		if (q != NULL) {	// found blank line
			dot = next_line(q);	// move to next blank line
		}
		break;
	case '}':			// }- move forward paragraph
		q = char_search(dot, (Byte *) "\n\n", FORWARD, FULL);
		if (q != NULL) {	// found blank line
			dot = next_line(q);	// move to next blank line
		}
		break;
#endif							/* CONFIG_FEATURE_VI_SEARCH */
	case '0':			// 0- goto begining of line
	case '1':			// 1- 
	case '2':			// 2- 
	case '3':			// 3- 
	case '4':			// 4- 
	case '5':			// 5- 
	case '6':			// 6- 
	case '7':			// 7- 
	case '8':			// 8- 
	case '9':			// 9- 
		if (c == '0' && cmdcnt < 1) {
			dot_begin();	// this was a standalone zero
		} else {
			cmdcnt = cmdcnt * 10 + (c - '0');	// this 0 is part of a number
		}
		break;
	case ':':			// :- the colon mode commands
		p = get_input_line((Byte *) ":");	// get input line- use "status line"
#ifdef CONFIG_FEATURE_VI_COLON
		colon(p);		// execute the command
#else							/* CONFIG_FEATURE_VI_COLON */
		if (*p == ':')
			p++;				// move past the ':'
		cnt = strlen((char *) p);
		if (cnt <= 0)
			break;
		if (strncasecmp((char *) p, "quit", cnt) == 0 ||
			strncasecmp((char *) p, "q!", cnt) == 0) {	// delete lines
			if (file_modified && p[1] != '!') {
				psbs("No write since last change (:quit! overrides)");
			} else {
				editing = 0;
			}
		} else if (strncasecmp((char *) p, "write", cnt) == 0 ||
				   strncasecmp((char *) p, "wq", cnt) == 0 ||
				   strncasecmp((char *) p, "x", cnt) == 0) {
			cnt = file_write(cfn, text, end - 1);
			file_modified = FALSE;
			psb("\"%s\" %dL, %dC", cfn, count_lines(text, end - 1), cnt);
			if (p[0] == 'x' || p[1] == 'q') {
				editing = 0;
			}
		} else if (strncasecmp((char *) p, "file", cnt) == 0 ) {
			edit_status();			// show current file status
		} else if (sscanf((char *) p, "%d", &j) > 0) {
			dot = find_line(j);		// go to line # j
			dot_skip_over_ws();
		} else {		// unrecognised cmd
			ni((Byte *) p);
		}
#endif							/* CONFIG_FEATURE_VI_COLON */
		break;
	case '<':			// <- Left  shift something
	case '>':			// >- Right shift something
		cnt = count_lines(text, dot);	// remember what line we are on
		c1 = get_one_char();	// get the type of thing to delete
		find_range(&p, &q, c1);
		(void) yank_delete(p, q, 1, YANKONLY);	// save copy before change
		p = begin_line(p);
		q = end_line(q);
		i = count_lines(p, q);	// # of lines we are shifting
		for ( ; i > 0; i--, p = next_line(p)) {
			if (c == '<') {
				// shift left- remove tab or 8 spaces
				if (*p == '\t') {
					// shrink buffer 1 char
					(void) text_hole_delete(p, p);
				} else if (*p == ' ') {
					// we should be calculating columns, not just SPACE
					for (j = 0; *p == ' ' && j < tabstop; j++) {
						(void) text_hole_delete(p, p);
					}
				}
			} else if (c == '>') {
				// shift right -- add tab or 8 spaces
				(void) char_insert(p, '\t');
			}
		}
		dot = find_line(cnt);	// what line were we on
		dot_skip_over_ws();
		end_cmd_q();	// stop adding to q
		break;
	case 'A':			// A- append at e-o-l
		dot_end();		// go to e-o-l
		//**** fall thru to ... 'a'
	case 'a':			// a- append after current char
		if (*dot != '\n')
			dot++;
		goto dc_i;
		break;
	case 'B':			// B- back a blank-delimited Word
	case 'E':			// E- end of a blank-delimited word
	case 'W':			// W- forward a blank-delimited word
		if (cmdcnt-- > 1) {
			do_cmd(c);
		}				// repeat cnt
		dir = FORWARD;
		if (c == 'B')
			dir = BACK;
		if (c == 'W' || isspace(dot[dir])) {
			dot = skip_thing(dot, 1, dir, S_TO_WS);
			dot = skip_thing(dot, 2, dir, S_OVER_WS);
		}
		if (c != 'W')
			dot = skip_thing(dot, 1, dir, S_BEFORE_WS);
		break;
	case 'C':			// C- Change to e-o-l
	case 'D':			// D- delete to e-o-l
		save_dot = dot;
		dot = dollar_line(dot);	// move to before NL
		// copy text into a register and delete
		dot = yank_delete(save_dot, dot, 0, YANKDEL);	// delete to e-o-l
		if (c == 'C')
			goto dc_i;	// start inserting
#ifdef CONFIG_FEATURE_VI_DOT_CMD
		if (c == 'D')
			end_cmd_q();	// stop adding to q
#endif							/* CONFIG_FEATURE_VI_DOT_CMD */
		break;
	case 'G':		// G- goto to a line number (default= E-O-F)
		dot = end - 1;				// assume E-O-F
		if (cmdcnt > 0) {
			dot = find_line(cmdcnt);	// what line is #cmdcnt
		}
		dot_skip_over_ws();
		break;
	case 'H':			// H- goto top line on screen
		dot = screenbegin;
		if (cmdcnt > (rows - 1)) {
			cmdcnt = (rows - 1);
		}
		if (cmdcnt-- > 1) {
			do_cmd('+');
		}				// repeat cnt
		dot_skip_over_ws();
		break;
	case 'I':			// I- insert before first non-blank
		dot_begin();	// 0
		dot_skip_over_ws();
		//**** fall thru to ... 'i'
	case 'i':			// i- insert before current char
	case VI_K_INSERT:	// Cursor Key Insert
	  dc_i:
		cmd_mode = 1;	// start insrting
		psb("-- Insert --");
		break;
	case 'J':			// J- join current and next lines together
		if (cmdcnt-- > 2) {
			do_cmd(c);
		}				// repeat cnt
		dot_end();		// move to NL
		if (dot < end - 1) {	// make sure not last char in text[]
			*dot++ = ' ';	// replace NL with space
			while (isblnk(*dot)) {	// delete leading WS
				dot_delete();
			}
		}
		end_cmd_q();	// stop adding to q
		break;
	case 'L':			// L- goto bottom line on screen
		dot = end_screen();
		if (cmdcnt > (rows - 1)) {
			cmdcnt = (rows - 1);
		}
		if (cmdcnt-- > 1) {
			do_cmd('-');
		}				// repeat cnt
		dot_begin();
		dot_skip_over_ws();
		break;
	case 'M':			// M- goto middle line on screen
		dot = screenbegin;
		for (cnt = 0; cnt < (rows-1) / 2; cnt++)
			dot = next_line(dot);
		break;
	case 'O':			// O- open a empty line above
		//    0i\n ESC -i
		p = begin_line(dot);
		if (p[-1] == '\n') {
			dot_prev();
	case 'o':			// o- open a empty line below; Yes, I know it is in the middle of the "if (..."
			dot_end();
			dot = char_insert(dot, '\n');
		} else {
			dot_begin();	// 0
			dot = char_insert(dot, '\n');	// i\n ESC
			dot_prev();	// -
		}
		goto dc_i;
		break;
	case 'R':			// R- continuous Replace char
	  dc5:
		cmd_mode = 2;
		psb("-- Replace --");
		break;
	case 'X':			// X- delete char before dot
	case 'x':			// x- delete the current char
	case 's':			// s- substitute the current char
		if (cmdcnt-- > 1) {
			do_cmd(c);
		}				// repeat cnt
		dir = 0;
		if (c == 'X')
			dir = -1;
		if (dot[dir] != '\n') {
			if (c == 'X')
				dot--;	// delete prev char
			dot = yank_delete(dot, dot, 0, YANKDEL);	// delete char
		}
		if (c == 's')
			goto dc_i;	// start insrting
		end_cmd_q();	// stop adding to q
		break;
	case 'Z':			// Z- if modified, {write}; exit
		// ZZ means to save file (if necessary), then exit
		c1 = get_one_char();
		if (c1 != 'Z') {
			indicate_error(c);
			break;
		}
		if (file_modified
#ifdef CONFIG_FEATURE_VI_READONLY
			&& ! vi_readonly
			&& ! readonly
#endif							/* CONFIG_FEATURE_VI_READONLY */
			) {
			cnt = file_write(cfn, text, end - 1);
			if (cnt == (end - 1 - text + 1)) {
				editing = 0;
			}
		} else {
			editing = 0;
		}
		break;
	case '^':			// ^- move to first non-blank on line
		dot_begin();
		dot_skip_over_ws();
		break;
	case 'b':			// b- back a word
	case 'e':			// e- end of word
		if (cmdcnt-- > 1) {
			do_cmd(c);
		}				// repeat cnt
		dir = FORWARD;
		if (c == 'b')
			dir = BACK;
		if ((dot + dir) < text || (dot + dir) > end - 1)
			break;
		dot += dir;
		if (isspace(*dot)) {
			dot = skip_thing(dot, (c == 'e') ? 2 : 1, dir, S_OVER_WS);
		}
		if (isalnum(*dot) || *dot == '_') {
			dot = skip_thing(dot, 1, dir, S_END_ALNUM);
		} else if (ispunct(*dot)) {
			dot = skip_thing(dot, 1, dir, S_END_PUNCT);
		}
		break;
	case 'c':			// c- change something
	case 'd':			// d- delete something
#ifdef CONFIG_FEATURE_VI_YANKMARK
	case 'y':			// y- yank   something
	case 'Y':			// Y- Yank a line
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
		yf = YANKDEL;	// assume either "c" or "d"
#ifdef CONFIG_FEATURE_VI_YANKMARK
		if (c == 'y' || c == 'Y')
			yf = YANKONLY;
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
		c1 = 'y';
		if (c != 'Y')
			c1 = get_one_char();	// get the type of thing to delete
		find_range(&p, &q, c1);
		if (c1 == 27) {	// ESC- user changed mind and wants out
			c = c1 = 27;	// Escape- do nothing
		} else if (strchr("wW", c1)) {
			if (c == 'c') {
				// don't include trailing WS as part of word
				while (isblnk(*q)) {
					if (q <= text || q[-1] == '\n')
						break;
					q--;
				}
			}
			dot = yank_delete(p, q, 0, yf);	// delete word
		} else if (strchr("^0bBeEft$", c1)) {
			// single line copy text into a register and delete
			dot = yank_delete(p, q, 0, yf);	// delete word
		} else if (strchr("cdykjHL%+-{}\r\n", c1)) {
			// multiple line copy text into a register and delete
			dot = yank_delete(p, q, 1, yf);	// delete lines
			if (c == 'c') {
				dot = char_insert(dot, '\n');
				// on the last line of file don't move to prev line
				if (dot != (end-1)) {
					dot_prev();
				}
			} else if (c == 'd') {
				dot_begin();
				dot_skip_over_ws();
			}
		} else {
			// could not recognize object
			c = c1 = 27;	// error-
			indicate_error(c);
		}
		if (c1 != 27) {
			// if CHANGING, not deleting, start inserting after the delete
			if (c == 'c') {
				strcpy((char *) buf, "Change");
				goto dc_i;	// start inserting
			}
			if (c == 'd') {
				strcpy((char *) buf, "Delete");
			}
#ifdef CONFIG_FEATURE_VI_YANKMARK
			if (c == 'y' || c == 'Y') {
				strcpy((char *) buf, "Yank");
			}
			p = reg[YDreg];
			q = p + strlen((char *) p);
			for (cnt = 0; p <= q; p++) {
				if (*p == '\n')
					cnt++;
			}
			psb("%s %d lines (%d chars) using [%c]",
				buf, cnt, strlen((char *) reg[YDreg]), what_reg());
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
			end_cmd_q();	// stop adding to q
		}
		break;
	case 'k':			// k- goto prev line, same col
	case VI_K_UP:		// cursor key Up
		if (cmdcnt-- > 1) {
			do_cmd(c);
		}				// repeat cnt
		dot_prev();
		dot = move_to_col(dot, ccol + offset);	// try stay in same col
		break;
	case 'r':			// r- replace the current char with user input
		c1 = get_one_char();	// get the replacement char
		if (*dot != '\n') {
			*dot = c1;
			file_modified = TRUE;	// has the file been modified
		}
		end_cmd_q();	// stop adding to q
		break;
	case 't':			// t- move to char prior to next x
                last_forward_char = get_one_char();
                do_cmd(';');
                if (*dot == last_forward_char)
                        dot_left();
                last_forward_char= 0;
		break;
	case 'w':			// w- forward a word
		if (cmdcnt-- > 1) {
			do_cmd(c);
		}				// repeat cnt
		if (isalnum(*dot) || *dot == '_') {	// we are on ALNUM
			dot = skip_thing(dot, 1, FORWARD, S_END_ALNUM);
		} else if (ispunct(*dot)) {	// we are on PUNCT
			dot = skip_thing(dot, 1, FORWARD, S_END_PUNCT);
		}
		if (dot < end - 1)
			dot++;		// move over word
		if (isspace(*dot)) {
			dot = skip_thing(dot, 2, FORWARD, S_OVER_WS);
		}
		break;
	case 'z':			// z-
		c1 = get_one_char();	// get the replacement char
		cnt = 0;
		if (c1 == '.')
			cnt = (rows - 2) / 2;	// put dot at center
		if (c1 == '-')
			cnt = rows - 2;	// put dot at bottom
		screenbegin = begin_line(dot);	// start dot at top
		dot_scroll(cnt, -1);
		break;
	case '|':			// |- move to column "cmdcnt"
		dot = move_to_col(dot, cmdcnt - 1);	// try to move to column
		break;
	case '~':			// ~- flip the case of letters   a-z -> A-Z
		if (cmdcnt-- > 1) {
			do_cmd(c);
		}				// repeat cnt
		if (islower(*dot)) {
			*dot = toupper(*dot);
			file_modified = TRUE;	// has the file been modified
		} else if (isupper(*dot)) {
			*dot = tolower(*dot);
			file_modified = TRUE;	// has the file been modified
		}
		dot_right();
		end_cmd_q();	// stop adding to q
		break;
		//----- The Cursor and Function Keys -----------------------------
	case VI_K_HOME:	// Cursor Key Home
		dot_begin();
		break;
		// The Fn keys could point to do_macro which could translate them
	case VI_K_FUN1:	// Function Key F1
	case VI_K_FUN2:	// Function Key F2
	case VI_K_FUN3:	// Function Key F3
	case VI_K_FUN4:	// Function Key F4
	case VI_K_FUN5:	// Function Key F5
	case VI_K_FUN6:	// Function Key F6
	case VI_K_FUN7:	// Function Key F7
	case VI_K_FUN8:	// Function Key F8
	case VI_K_FUN9:	// Function Key F9
	case VI_K_FUN10:	// Function Key F10
	case VI_K_FUN11:	// Function Key F11
	case VI_K_FUN12:	// Function Key F12
		break;
	}

  dc1:
	// if text[] just became empty, add back an empty line
	if (end == text) {
		(void) char_insert(text, '\n');	// start empty buf with dummy line
		dot = text;
	}
	// it is OK for dot to exactly equal to end, otherwise check dot validity
	if (dot != end) {
		dot = bound_dot(dot);	// make sure "dot" is valid
	}
#ifdef CONFIG_FEATURE_VI_YANKMARK
	check_context(c);	// update the current context
#endif							/* CONFIG_FEATURE_VI_YANKMARK */

	if (!isdigit(c))
		cmdcnt = 0;		// cmd was not a number, reset cmdcnt
	cnt = dot - begin_line(dot);
	// Try to stay off of the Newline
	if (*dot == '\n' && cnt > 0 && cmd_mode == 0)
		dot--;
}

//----- The Colon commands -------------------------------------
#ifdef CONFIG_FEATURE_VI_COLON
static Byte *get_one_address(Byte * p, int *addr)	// get colon addr, if present
{
	int st;
	Byte *q;

#ifdef CONFIG_FEATURE_VI_YANKMARK
	Byte c;
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
#ifdef CONFIG_FEATURE_VI_SEARCH
	Byte *pat, buf[BUFSIZ];
#endif							/* CONFIG_FEATURE_VI_SEARCH */

	*addr = -1;			// assume no addr
	if (*p == '.') {	// the current line
		p++;
		q = begin_line(dot);
		*addr = count_lines(text, q);
#ifdef CONFIG_FEATURE_VI_YANKMARK
	} else if (*p == '\'') {	// is this a mark addr
		p++;
		c = tolower(*p);
		p++;
		if (c >= 'a' && c <= 'z') {
			// we have a mark
			c = c - 'a';
			q = mark[(int) c];
			if (q != NULL) {	// is mark valid
				*addr = count_lines(text, q);	// count lines
			}
		}
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
#ifdef CONFIG_FEATURE_VI_SEARCH
	} else if (*p == '/') {	// a search pattern
		q = buf;
		for (p++; *p; p++) {
			if (*p == '/')
				break;
			*q++ = *p;
			*q = '\0';
		}
		pat = (Byte *) xstrdup((char *) buf);	// save copy of pattern
		if (*p == '/')
			p++;
		q = char_search(dot, pat, FORWARD, FULL);
		if (q != NULL) {
			*addr = count_lines(text, q);
		}
		free(pat);
#endif							/* CONFIG_FEATURE_VI_SEARCH */
	} else if (*p == '$') {	// the last line in file
		p++;
		q = begin_line(end - 1);
		*addr = count_lines(text, q);
	} else if (isdigit(*p)) {	// specific line number
		sscanf((char *) p, "%d%n", addr, &st);
		p += st;
	} else {			// I don't reconise this
		// unrecognised address- assume -1
		*addr = -1;
	}
	return (p);
}

static Byte *get_address(Byte *p, int *b, int *e)	// get two colon addrs, if present
{
	//----- get the address' i.e., 1,3   'a,'b  -----
	// get FIRST addr, if present
	while (isblnk(*p))
		p++;				// skip over leading spaces
	if (*p == '%') {			// alias for 1,$
		p++;
		*b = 1;
		*e = count_lines(text, end-1);
		goto ga0;
	}
	p = get_one_address(p, b);
	while (isblnk(*p))
		p++;
	if (*p == ',') {			// is there a address seperator
		p++;
		while (isblnk(*p))
			p++;
		// get SECOND addr, if present
		p = get_one_address(p, e);
	}
ga0:
	while (isblnk(*p))
		p++;				// skip over trailing spaces
	return (p);
}

static void colon(Byte * buf)
{
	Byte c, *orig_buf, *buf1, *q, *r;
	Byte *fn, cmd[BUFSIZ], args[BUFSIZ];
	int i, l, li, ch, st, b, e;
	int useforce, forced;
	struct stat st_buf;

	// :3154	// if (-e line 3154) goto it  else stay put
	// :4,33w! foo	// write a portion of buffer to file "foo"
	// :w		// write all of buffer to current file
	// :q		// quit
	// :q!		// quit- dont care about modified file
	// :'a,'z!sort -u   // filter block through sort
	// :'f		// goto mark "f"
	// :'fl		// list literal the mark "f" line
	// :.r bar	// read file "bar" into buffer before dot
	// :/123/,/abc/d    // delete lines from "123" line to "abc" line
	// :/xyz/	// goto the "xyz" line
	// :s/find/replace/ // substitute pattern "find" with "replace"
	// :!<cmd>	// run <cmd> then return
	//
	if (strlen((char *) buf) <= 0)
		goto vc1;
	if (*buf == ':')
		buf++;			// move past the ':'

	forced = useforce = FALSE;
	li = st = ch = i = 0;
	b = e = -1;
	q = text;			// assume 1,$ for the range
	r = end - 1;
	li = count_lines(text, end - 1);
	fn = cfn;			// default to current file
	memset(cmd, '\0', BUFSIZ);	// clear cmd[]
	memset(args, '\0', BUFSIZ);	// clear args[]

	// look for optional address(es)  :.  :1  :1,9   :'q,'a   :%
	buf = get_address(buf, &b, &e);

	// remember orig command line
	orig_buf = buf;

	// get the COMMAND into cmd[]
	buf1 = cmd;
	while (*buf != '\0') {
		if (isspace(*buf))
			break;
		*buf1++ = *buf++;
	}
	// get any ARGuments
	while (isblnk(*buf))
		buf++;
	strcpy((char *) args, (char *) buf);
	buf1 = last_char_is((char *)cmd, '!');
	if (buf1) {
		useforce = TRUE;
		*buf1 = '\0';   // get rid of !
	}
	if (b >= 0) {
		// if there is only one addr, then the addr
		// is the line number of the single line the
		// user wants. So, reset the end
		// pointer to point at end of the "b" line
		q = find_line(b);	// what line is #b
		r = end_line(q);
		li = 1;
	}
	if (e >= 0) {
		// we were given two addrs.  change the
		// end pointer to the addr given by user.
		r = find_line(e);	// what line is #e
		r = end_line(r);
		li = e - b + 1;
	}
	// ------------ now look for the command ------------
	i = strlen((char *) cmd);
	if (i == 0) {		// :123CR goto line #123
		if (b >= 0) {
			dot = find_line(b);	// what line is #b
			dot_skip_over_ws();
		}
	} else if (strncmp((char *) cmd, "!", 1) == 0) {	// run a cmd
		// :!ls   run the <cmd>
		(void) alarm(0);		// wait for input- no alarms
		place_cursor(rows - 1, 0, FALSE);	// go to Status line
		clear_to_eol();			// clear the line
		cookmode();
		system(orig_buf+1);		// run the cmd
		rawmode();
		Hit_Return();			// let user see results
		(void) alarm(3);		// done waiting for input
	} else if (strncmp((char *) cmd, "=", i) == 0) {	// where is the address
		if (b < 0) {	// no addr given- use defaults
			b = e = count_lines(text, dot);
		}
		psb("%d", b);
	} else if (strncasecmp((char *) cmd, "delete", i) == 0) {	// delete lines
		if (b < 0) {	// no addr given- use defaults
			q = begin_line(dot);	// assume .,. for the range
			r = end_line(dot);
		}
		dot = yank_delete(q, r, 1, YANKDEL);	// save, then delete lines
		dot_skip_over_ws();
	} else if (strncasecmp((char *) cmd, "edit", i) == 0) {	// Edit a file
		int sr;
		sr= 0;
		// don't edit, if the current file has been modified
		if (file_modified && ! useforce) {
			psbs("No write since last change (:edit! overrides)");
			goto vc1;
		}
		if (strlen(args) > 0) {
			// the user supplied a file name
			fn= args;
		} else if (cfn != 0 && strlen(cfn) > 0) {
			// no user supplied name- use the current filename
			fn= cfn;
			goto vc5;
		} else {
			// no user file name, no current name- punt
			psbs("No current filename");
			goto vc1;
		}

		// see if file exists- if not, its just a new file request
		if ((sr=stat((char*)fn, &st_buf)) < 0) {
			// This is just a request for a new file creation.
			// The file_insert below will fail but we get
			// an empty buffer with a file name.  Then the "write"
			// command can do the create.
		} else {
			if ((st_buf.st_mode & (S_IFREG)) == 0) {
				// This is not a regular file
				psbs("\"%s\" is not a regular file", fn);
				goto vc1;
			}
			if ((st_buf.st_mode & (S_IRUSR | S_IRGRP | S_IROTH)) == 0) {
				// dont have any read permissions
				psbs("\"%s\" is not readable", fn);
				goto vc1;
			}
		}

		// There is a read-able regular file
		// make this the current file
		q = (Byte *) xstrdup((char *) fn);	// save the cfn
		if (cfn != 0)
			free(cfn);		// free the old name
		cfn = q;			// remember new cfn

	  vc5:
		// delete all the contents of text[]
		new_text(2 * file_size(fn));
		screenbegin = dot = end = text;

		// insert new file
		ch = file_insert(fn, text, file_size(fn));

		if (ch < 1) {
			// start empty buf with dummy line
			(void) char_insert(text, '\n');
			ch= 1;
		}
		file_modified = FALSE;
#ifdef CONFIG_FEATURE_VI_YANKMARK
		if (Ureg >= 0 && Ureg < 28 && reg[Ureg] != 0) {
			free(reg[Ureg]);	//   free orig line reg- for 'U'
			reg[Ureg]= 0;
		}
		if (YDreg >= 0 && YDreg < 28 && reg[YDreg] != 0) {
			free(reg[YDreg]);	//   free default yank/delete register
			reg[YDreg]= 0;
		}
		for (li = 0; li < 28; li++) {
			mark[li] = 0;
		}				// init the marks
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
		// how many lines in text[]?
		li = count_lines(text, end - 1);
		psb("\"%s\"%s"
#ifdef CONFIG_FEATURE_VI_READONLY
			"%s"
#endif							/* CONFIG_FEATURE_VI_READONLY */
			" %dL, %dC", cfn,
			(sr < 0 ? " [New file]" : ""),
#ifdef CONFIG_FEATURE_VI_READONLY
			((vi_readonly || readonly) ? " [Read only]" : ""),
#endif							/* CONFIG_FEATURE_VI_READONLY */
			li, ch);
	} else if (strncasecmp((char *) cmd, "file", i) == 0) {	// what File is this
		if (b != -1 || e != -1) {
			ni((Byte *) "No address allowed on this command");
			goto vc1;
		}
		if (strlen((char *) args) > 0) {
			// user wants a new filename
			if (cfn != NULL)
				free(cfn);
			cfn = (Byte *) xstrdup((char *) args);
		} else {
			// user wants file status info
			edit_status();
		}
	} else if (strncasecmp((char *) cmd, "features", i) == 0) {	// what features are available
		// print out values of all features
		place_cursor(rows - 1, 0, FALSE);	// go to Status line, bottom of screen
		clear_to_eol();	// clear the line
		cookmode();
		show_help();
		rawmode();
		Hit_Return();
	} else if (strncasecmp((char *) cmd, "list", i) == 0) {	// literal print line
		if (b < 0) {	// no addr given- use defaults
			q = begin_line(dot);	// assume .,. for the range
			r = end_line(dot);
		}
		place_cursor(rows - 1, 0, FALSE);	// go to Status line, bottom of screen
		clear_to_eol();	// clear the line
		write(1, "\r\n", 2);
		for (; q <= r; q++) {
			c = *q;
			if (c > '~')
				standout_start();
			if (c == '\n') {
				write(1, "$\r", 2);
			} else if (*q < ' ') {
				write(1, "^", 1);
				c += '@';
			}
			write(1, &c, 1);
			if (c > '~')
				standout_end();
		}
#ifdef CONFIG_FEATURE_VI_SET
	  vc2:
#endif							/* CONFIG_FEATURE_VI_SET */
		Hit_Return();
	} else if ((strncasecmp((char *) cmd, "quit", i) == 0) ||	// Quit
			   (strncasecmp((char *) cmd, "next", i) == 0)) {	// edit next file
		if (useforce) {
			// force end of argv list
			if (*cmd == 'q') {
				optind = save_argc;
			}
			editing = 0;
			goto vc1;
		}
		// don't exit if the file been modified
		if (file_modified) {
			psbs("No write since last change (:%s! overrides)",
				 (*cmd == 'q' ? "quit" : "next"));
			goto vc1;
		}
		// are there other file to edit
		if (*cmd == 'q' && optind < save_argc - 1) {
			psbs("%d more file to edit", (save_argc - optind - 1));
			goto vc1;
		}
		if (*cmd == 'n' && optind >= save_argc - 1) {
			psbs("No more files to edit");
			goto vc1;
		}
		editing = 0;
	} else if (strncasecmp((char *) cmd, "read", i) == 0) {	// read file into text[]
		fn = args;
		if (strlen((char *) fn) <= 0) {
			psbs("No filename given");
			goto vc1;
		}
		if (b < 0) {	// no addr given- use defaults
			q = begin_line(dot);	// assume "dot"
		}
		// read after current line- unless user said ":0r foo"
		if (b != 0)
			q = next_line(q);
#ifdef CONFIG_FEATURE_VI_READONLY
		l= readonly;			// remember current files' status
#endif
		ch = file_insert(fn, q, file_size(fn));
#ifdef CONFIG_FEATURE_VI_READONLY
		readonly= l;
#endif
		if (ch < 0)
			goto vc1;	// nothing was inserted
		// how many lines in text[]?
		li = count_lines(q, q + ch - 1);
		psb("\"%s\""
#ifdef CONFIG_FEATURE_VI_READONLY
			"%s"
#endif							/* CONFIG_FEATURE_VI_READONLY */
			" %dL, %dC", fn,
#ifdef CONFIG_FEATURE_VI_READONLY
			((vi_readonly || readonly) ? " [Read only]" : ""),
#endif							/* CONFIG_FEATURE_VI_READONLY */
			li, ch);
		if (ch > 0) {
			// if the insert is before "dot" then we need to update
			if (q <= dot)
				dot += ch;
			file_modified = TRUE;
		}
	} else if (strncasecmp((char *) cmd, "rewind", i) == 0) {	// rewind cmd line args
		if (file_modified && ! useforce) {
			psbs("No write since last change (:rewind! overrides)");
		} else {
			// reset the filenames to edit
			optind = fn_start - 1;
			editing = 0;
		}
#ifdef CONFIG_FEATURE_VI_SET
	} else if (strncasecmp((char *) cmd, "set", i) == 0) {	// set or clear features
		i = 0;			// offset into args
		if (strlen((char *) args) == 0) {
			// print out values of all options
			place_cursor(rows - 1, 0, FALSE);	// go to Status line, bottom of screen
			clear_to_eol();	// clear the line
			printf("----------------------------------------\r\n");
#ifdef CONFIG_FEATURE_VI_SETOPTS
			if (!autoindent)
				printf("no");
			printf("autoindent ");
			if (!err_method)
				printf("no");
			printf("flash ");
			if (!ignorecase)
				printf("no");
			printf("ignorecase ");
			if (!showmatch)
				printf("no");
			printf("showmatch ");
			printf("tabstop=%d ", tabstop);
#endif							/* CONFIG_FEATURE_VI_SETOPTS */
			printf("\r\n");
			goto vc2;
		}
		if (strncasecmp((char *) args, "no", 2) == 0)
			i = 2;		// ":set noautoindent"
#ifdef CONFIG_FEATURE_VI_SETOPTS
		if (strncasecmp((char *) args + i, "autoindent", 10) == 0 ||
			strncasecmp((char *) args + i, "ai", 2) == 0) {
			autoindent = (i == 2) ? 0 : 1;
		}
		if (strncasecmp((char *) args + i, "flash", 5) == 0 ||
			strncasecmp((char *) args + i, "fl", 2) == 0) {
			err_method = (i == 2) ? 0 : 1;
		}
		if (strncasecmp((char *) args + i, "ignorecase", 10) == 0 ||
			strncasecmp((char *) args + i, "ic", 2) == 0) {
			ignorecase = (i == 2) ? 0 : 1;
		}
		if (strncasecmp((char *) args + i, "showmatch", 9) == 0 ||
			strncasecmp((char *) args + i, "sm", 2) == 0) {
			showmatch = (i == 2) ? 0 : 1;
		}
		if (strncasecmp((char *) args + i, "tabstop", 7) == 0) {
			sscanf(strchr((char *) args + i, '='), "=%d", &ch);
			if (ch > 0 && ch < columns - 1)
				tabstop = ch;
		}
#endif							/* CONFIG_FEATURE_VI_SETOPTS */
#endif							/* CONFIG_FEATURE_VI_SET */
#ifdef CONFIG_FEATURE_VI_SEARCH
	} else if (strncasecmp((char *) cmd, "s", 1) == 0) {	// substitute a pattern with a replacement pattern
		Byte *ls, *F, *R;
		int gflag;

		// F points to the "find" pattern
		// R points to the "replace" pattern
		// replace the cmd line delimiters "/" with NULLs
		gflag = 0;		// global replace flag
		c = orig_buf[1];	// what is the delimiter
		F = orig_buf + 2;	// start of "find"
		R = (Byte *) strchr((char *) F, c);	// middle delimiter
		if (!R) goto colon_s_fail;
		*R++ = '\0';	// terminate "find"
		buf1 = (Byte *) strchr((char *) R, c);
		if (!buf1) goto colon_s_fail;
		*buf1++ = '\0';	// terminate "replace"
		if (*buf1 == 'g') {	// :s/foo/bar/g
			buf1++;
			gflag++;	// turn on gflag
		}
		q = begin_line(q);
		if (b < 0) {	// maybe :s/foo/bar/
			q = begin_line(dot);	// start with cur line
			b = count_lines(text, q);	// cur line number
		}
		if (e < 0)
			e = b;		// maybe :.s/foo/bar/
		for (i = b; i <= e; i++) {	// so, :20,23 s \0 find \0 replace \0
			ls = q;		// orig line start
		  vc4:
			buf1 = char_search(q, F, FORWARD, LIMITED);	// search cur line only for "find"
			if (buf1 != NULL) {
				// we found the "find" pattern- delete it
				(void) text_hole_delete(buf1, buf1 + strlen((char *) F) - 1);
				// inset the "replace" patern
				(void) string_insert(buf1, R);	// insert the string
				// check for "global"  :s/foo/bar/g
				if (gflag == 1) {
					if ((buf1 + strlen((char *) R)) < end_line(ls)) {
						q = buf1 + strlen((char *) R);
						goto vc4;	// don't let q move past cur line
					}
				}
			}
			q = next_line(ls);
		}
#endif							/* CONFIG_FEATURE_VI_SEARCH */
	} else if (strncasecmp((char *) cmd, "version", i) == 0) {	// show software version
		psb("%s", vi_Version);
	} else if ((strncasecmp((char *) cmd, "write", i) == 0) ||	// write text to file
			   (strncasecmp((char *) cmd, "wq", i) == 0) ||
			   (strncasecmp((char *) cmd, "x", i) == 0)) {
		// is there a file name to write to?
		if (strlen((char *) args) > 0) {
			fn = args;
		}
#ifdef CONFIG_FEATURE_VI_READONLY
		if ((vi_readonly || readonly) && ! useforce) {
			psbs("\"%s\" File is read only", fn);
			goto vc3;
		}
#endif							/* CONFIG_FEATURE_VI_READONLY */
		// how many lines in text[]?
		li = count_lines(q, r);
		ch = r - q + 1;
		// see if file exists- if not, its just a new file request
		if (useforce) {
			// if "fn" is not write-able, chmod u+w
			// sprintf(syscmd, "chmod u+w %s", fn);
			// system(syscmd);
			forced = TRUE;
		}
		l = file_write(fn, q, r);
		if (useforce && forced) {
			// chmod u-w
			// sprintf(syscmd, "chmod u-w %s", fn);
			// system(syscmd);
			forced = FALSE;
		}
		psb("\"%s\" %dL, %dC", fn, li, l);
		if (q == text && r == end - 1 && l == ch)
			file_modified = FALSE;
		if ((cmd[0] == 'x' || cmd[1] == 'q') && l == ch) {
			editing = 0;
		}
#ifdef CONFIG_FEATURE_VI_READONLY
	  vc3:;
#endif							/* CONFIG_FEATURE_VI_READONLY */
#ifdef CONFIG_FEATURE_VI_YANKMARK
	} else if (strncasecmp((char *) cmd, "yank", i) == 0) {	// yank lines
		if (b < 0) {	// no addr given- use defaults
			q = begin_line(dot);	// assume .,. for the range
			r = end_line(dot);
		}
		text_yank(q, r, YDreg);
		li = count_lines(q, r);
		psb("Yank %d lines (%d chars) into [%c]",
			li, strlen((char *) reg[YDreg]), what_reg());
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
	} else {
		// cmd unknown
		ni((Byte *) cmd);
	}
  vc1:
	dot = bound_dot(dot);	// make sure "dot" is valid
	return;
#ifdef CONFIG_FEATURE_VI_SEARCH
colon_s_fail:
	psb(":s expression missing delimiters");
	return;
#endif

}

static void Hit_Return(void)
{
	char c;

	standout_start();	// start reverse video
	write(1, "[Hit return to continue]", 24);
	standout_end();		// end reverse video
	while ((c = get_one_char()) != '\n' && c != '\r')	/*do nothing */
		;
	redraw(TRUE);		// force redraw all
}
#endif							/* CONFIG_FEATURE_VI_COLON */

//----- Synchronize the cursor to Dot --------------------------
static void sync_cursor(Byte * d, int *row, int *col)
{
	Byte *beg_cur, *end_cur;	// begin and end of "d" line
	Byte *beg_scr, *end_scr;	// begin and end of screen
	Byte *tp;
	int cnt, ro, co;

	beg_cur = begin_line(d);	// first char of cur line
	end_cur = end_line(d);	// last char of cur line

	beg_scr = end_scr = screenbegin;	// first char of screen
	end_scr = end_screen();	// last char of screen

	if (beg_cur < screenbegin) {
		// "d" is before  top line on screen
		// how many lines do we have to move
		cnt = count_lines(beg_cur, screenbegin);
	  sc1:
		screenbegin = beg_cur;
		if (cnt > (rows - 1) / 2) {
			// we moved too many lines. put "dot" in middle of screen
			for (cnt = 0; cnt < (rows - 1) / 2; cnt++) {
				screenbegin = prev_line(screenbegin);
			}
		}
	} else if (beg_cur > end_scr) {
		// "d" is after bottom line on screen
		// how many lines do we have to move
		cnt = count_lines(end_scr, beg_cur);
		if (cnt > (rows - 1) / 2)
			goto sc1;	// too many lines
		for (ro = 0; ro < cnt - 1; ro++) {
			// move screen begin the same amount
			screenbegin = next_line(screenbegin);
			// now, move the end of screen
			end_scr = next_line(end_scr);
			end_scr = end_line(end_scr);
		}
	}
	// "d" is on screen- find out which row
	tp = screenbegin;
	for (ro = 0; ro < rows - 1; ro++) {	// drive "ro" to correct row
		if (tp == beg_cur)
			break;
		tp = next_line(tp);
	}

	// find out what col "d" is on
	co = 0;
	do {				// drive "co" to correct column
		if (*tp == '\n' || *tp == '\0')
			break;
		if (*tp == '\t') {
			//         7       - (co %    8  )
			co += ((tabstop - 1) - (co % tabstop));
		} else if (*tp < ' ') {
			co++;		// display as ^X, use 2 columns
		}
	} while (tp++ < d && ++co);

	// "co" is the column where "dot" is.
	// The screen has "columns" columns.
	// The currently displayed columns are  0+offset -- columns+ofset
	// |-------------------------------------------------------------|
	//               ^ ^                                ^
	//        offset | |------- columns ----------------|
	//
	// If "co" is already in this range then we do not have to adjust offset
	//      but, we do have to subtract the "offset" bias from "co".
	// If "co" is outside this range then we have to change "offset".
	// If the first char of a line is a tab the cursor will try to stay
	//  in column 7, but we have to set offset to 0.

	if (co < 0 + offset) {
		offset = co;
	}
	if (co >= columns + offset) {
		offset = co - columns + 1;
	}
	// if the first char of the line is a tab, and "dot" is sitting on it
	//  force offset to 0.
	if (d == beg_cur && *d == '\t') {
		offset = 0;
	}
	co -= offset;

	*row = ro;
	*col = co;
}

//----- Text Movement Routines ---------------------------------
static Byte *begin_line(Byte * p) // return pointer to first char cur line
{
	while (p > text && p[-1] != '\n')
		p--;			// go to cur line B-o-l
	return (p);
}

static Byte *end_line(Byte * p) // return pointer to NL of cur line line
{
	while (p < end - 1 && *p != '\n')
		p++;			// go to cur line E-o-l
	return (p);
}

static Byte *dollar_line(Byte * p) // return pointer to just before NL line
{
	while (p < end - 1 && *p != '\n')
		p++;			// go to cur line E-o-l
	// Try to stay off of the Newline
	if (*p == '\n' && (p - begin_line(p)) > 0)
		p--;
	return (p);
}

static Byte *prev_line(Byte * p) // return pointer first char prev line
{
	p = begin_line(p);	// goto begining of cur line
	if (p[-1] == '\n' && p > text)
		p--;			// step to prev line
	p = begin_line(p);	// goto begining of prev line
	return (p);
}

static Byte *next_line(Byte * p) // return pointer first char next line
{
	p = end_line(p);
	if (*p == '\n' && p < end - 1)
		p++;			// step to next line
	return (p);
}

//----- Text Information Routines ------------------------------
static Byte *end_screen(void)
{
	Byte *q;
	int cnt;

	// find new bottom line
	q = screenbegin;
	for (cnt = 0; cnt < rows - 2; cnt++)
		q = next_line(q);
	q = end_line(q);
	return (q);
}

static int count_lines(Byte * start, Byte * stop) // count line from start to stop
{
	Byte *q;
	int cnt;

	if (stop < start) {	// start and stop are backwards- reverse them
		q = start;
		start = stop;
		stop = q;
	}
	cnt = 0;
	stop = end_line(stop);	// get to end of this line
	for (q = start; q <= stop && q <= end - 1; q++) {
		if (*q == '\n')
			cnt++;
	}
	return (cnt);
}

static Byte *find_line(int li)	// find begining of line #li
{
	Byte *q;

	for (q = text; li > 1; li--) {
		q = next_line(q);
	}
	return (q);
}

//----- Dot Movement Routines ----------------------------------
static void dot_left(void)
{
	if (dot > text && dot[-1] != '\n')
		dot--;
}

static void dot_right(void)
{
	if (dot < end - 1 && *dot != '\n')
		dot++;
}

static void dot_begin(void)
{
	dot = begin_line(dot);	// return pointer to first char cur line
}

static void dot_end(void)
{
	dot = end_line(dot);	// return pointer to last char cur line
}

static Byte *move_to_col(Byte * p, int l)
{
	int co;

	p = begin_line(p);
	co = 0;
	do {
		if (*p == '\n' || *p == '\0')
			break;
		if (*p == '\t') {
			//         7       - (co %    8  )
			co += ((tabstop - 1) - (co % tabstop));
		} else if (*p < ' ') {
			co++;		// display as ^X, use 2 columns
		}
	} while (++co <= l && p++ < end);
	return (p);
}

static void dot_next(void)
{
	dot = next_line(dot);
}

static void dot_prev(void)
{
	dot = prev_line(dot);
}

static void dot_scroll(int cnt, int dir)
{
	Byte *q;

	for (; cnt > 0; cnt--) {
		if (dir < 0) {
			// scroll Backwards
			// ctrl-Y  scroll up one line
			screenbegin = prev_line(screenbegin);
		} else {
			// scroll Forwards
			// ctrl-E  scroll down one line
			screenbegin = next_line(screenbegin);
		}
	}
	// make sure "dot" stays on the screen so we dont scroll off
	if (dot < screenbegin)
		dot = screenbegin;
	q = end_screen();	// find new bottom line
	if (dot > q)
		dot = begin_line(q);	// is dot is below bottom line?
	dot_skip_over_ws();
}

static void dot_skip_over_ws(void)
{
	// skip WS
	while (isspace(*dot) && *dot != '\n' && dot < end - 1)
		dot++;
}

static void dot_delete(void)	// delete the char at 'dot'
{
	(void) text_hole_delete(dot, dot);
}

static Byte *bound_dot(Byte * p) // make sure  text[0] <= P < "end"
{
	if (p >= end && end > text) {
		p = end - 1;
		indicate_error('1');
	}
	if (p < text) {
		p = text;
		indicate_error('2');
	}
	return (p);
}

//----- Helper Utility Routines --------------------------------

//----------------------------------------------------------------
//----- Char Routines --------------------------------------------
/* Chars that are part of a word-
 *    0123456789_ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
 * Chars that are Not part of a word (stoppers)
 *    !"#$%&'()*+,-./:;<=>?@[\]^`{|}~
 * Chars that are WhiteSpace
 *    TAB NEWLINE VT FF RETURN SPACE
 * DO NOT COUNT NEWLINE AS WHITESPACE
 */

static Byte *new_screen(int ro, int co)
{
	int li;

	if (screen != 0)
		free(screen);
	screensize = ro * co + 8;
	screen = (Byte *) xmalloc(screensize);
	// initialize the new screen. assume this will be a empty file.
	screen_erase();
	//   non-existant text[] lines start with a tilde (~).
	for (li = 1; li < ro - 1; li++) {
		screen[(li * co) + 0] = '~';
	}
	return (screen);
}

static Byte *new_text(int size)
{
	if (size < 10240)
		size = 10240;	// have a minimum size for new files
	if (text != 0) {
		//text -= 4;
		free(text);
	}
	text = (Byte *) xmalloc(size + 8);
	memset(text, '\0', size);	// clear new text[]
	//text += 4;		// leave some room for "oops"
	textend = text + size - 1;
	//textend -= 4;		// leave some root for "oops"
	return (text);
}

#ifdef CONFIG_FEATURE_VI_SEARCH
static int mycmp(Byte * s1, Byte * s2, int len)
{
	int i;

	i = strncmp((char *) s1, (char *) s2, len);
#ifdef CONFIG_FEATURE_VI_SETOPTS
	if (ignorecase) {
		i = strncasecmp((char *) s1, (char *) s2, len);
	}
#endif							/* CONFIG_FEATURE_VI_SETOPTS */
	return (i);
}

static Byte *char_search(Byte * p, Byte * pat, int dir, int range)	// search for pattern starting at p
{
#ifndef REGEX_SEARCH
	Byte *start, *stop;
	int len;

	len = strlen((char *) pat);
	if (dir == FORWARD) {
		stop = end - 1;	// assume range is p - end-1
		if (range == LIMITED)
			stop = next_line(p);	// range is to next line
		for (start = p; start < stop; start++) {
			if (mycmp(start, pat, len) == 0) {
				return (start);
			}
		}
	} else if (dir == BACK) {
		stop = text;	// assume range is text - p
		if (range == LIMITED)
			stop = prev_line(p);	// range is to prev line
		for (start = p - len; start >= stop; start--) {
			if (mycmp(start, pat, len) == 0) {
				return (start);
			}
		}
	}
	// pattern not found
	return (NULL);
#else							/*REGEX_SEARCH */
	char *q;
	struct re_pattern_buffer preg;
	int i;
	int size, range;

	re_syntax_options = RE_SYNTAX_POSIX_EXTENDED;
	preg.translate = 0;
	preg.fastmap = 0;
	preg.buffer = 0;
	preg.allocated = 0;

	// assume a LIMITED forward search
	q = next_line(p);
	q = end_line(q);
	q = end - 1;
	if (dir == BACK) {
		q = prev_line(p);
		q = text;
	}
	// count the number of chars to search over, forward or backward
	size = q - p;
	if (size < 0)
		size = p - q;
	// RANGE could be negative if we are searching backwards
	range = q - p;

	q = (char *) re_compile_pattern(pat, strlen((char *) pat), &preg);
	if (q != 0) {
		// The pattern was not compiled
		psbs("bad search pattern: \"%s\": %s", pat, q);
		i = 0;			// return p if pattern not compiled
		goto cs1;
	}

	q = p;
	if (range < 0) {
		q = p - size;
		if (q < text)
			q = text;
	}
	// search for the compiled pattern, preg, in p[]
	// range < 0-  search backward
	// range > 0-  search forward
	// 0 < start < size
	// re_search() < 0  not found or error
	// re_search() > 0  index of found pattern
	//            struct pattern    char     int    int    int     struct reg
	// re_search (*pattern_buffer,  *string, size,  start, range,  *regs)
	i = re_search(&preg, q, size, 0, range, 0);
	if (i == -1) {
		p = 0;
		i = 0;			// return NULL if pattern not found
	}
  cs1:
	if (dir == FORWARD) {
		p = p + i;
	} else {
		p = p - i;
	}
	return (p);
#endif							/*REGEX_SEARCH */
}
#endif							/* CONFIG_FEATURE_VI_SEARCH */

static Byte *char_insert(Byte * p, Byte c) // insert the char c at 'p'
{
	if (c == 22) {		// Is this an ctrl-V?
		p = stupid_insert(p, '^');	// use ^ to indicate literal next
		p--;			// backup onto ^
		refresh(FALSE);	// show the ^
		c = get_one_char();
		*p = c;
		p++;
		file_modified = TRUE;	// has the file been modified
	} else if (c == 27) {	// Is this an ESC?
		cmd_mode = 0;
		cmdcnt = 0;
		end_cmd_q();	// stop adding to q
		strcpy((char *) status_buffer, " ");	// clear the status buffer
		if ((p[-1] != '\n') && (dot>text)) {
			p--;
		}
	} else if (c == erase_char) {	// Is this a BS
		//     123456789
		if ((p[-1] != '\n') && (dot>text)) {
			p--;
			p = text_hole_delete(p, p);	// shrink buffer 1 char
#ifdef CONFIG_FEATURE_VI_DOT_CMD
			// also rmove char from last_modifying_cmd
			if (strlen((char *) last_modifying_cmd) > 0) {
				Byte *q;

				q = last_modifying_cmd;
				q[strlen((char *) q) - 1] = '\0';	// erase BS
				q[strlen((char *) q) - 1] = '\0';	// erase prev char
			}
#endif							/* CONFIG_FEATURE_VI_DOT_CMD */
		}
	} else {
		// insert a char into text[]
		Byte *sp;		// "save p"

		if (c == 13)
			c = '\n';	// translate \r to \n
		sp = p;			// remember addr of insert
		p = stupid_insert(p, c);	// insert the char
#ifdef CONFIG_FEATURE_VI_SETOPTS
		if (showmatch && strchr(")]}", *sp) != NULL) {
			showmatching(sp);
		}
		if (autoindent && c == '\n') {	// auto indent the new line
			Byte *q;

			q = prev_line(p);	// use prev line as templet
			for (; isblnk(*q); q++) {
				p = stupid_insert(p, *q);	// insert the char
			}
		}
#endif							/* CONFIG_FEATURE_VI_SETOPTS */
	}
	return (p);
}

static Byte *stupid_insert(Byte * p, Byte c) // stupidly insert the char c at 'p'
{
	p = text_hole_make(p, 1);
	if (p != 0) {
		*p = c;
		file_modified = TRUE;	// has the file been modified
		p++;
	}
	return (p);
}

static Byte find_range(Byte ** start, Byte ** stop, Byte c)
{
	Byte *save_dot, *p, *q;
	int cnt;

	save_dot = dot;
	p = q = dot;

	if (strchr("cdy><", c)) {
		// these cmds operate on whole lines
		p = q = begin_line(p);
		for (cnt = 1; cnt < cmdcnt; cnt++) {
			q = next_line(q);
		}
		q = end_line(q);
	} else if (strchr("^%$0bBeEft", c)) {
		// These cmds operate on char positions
		do_cmd(c);		// execute movement cmd
		q = dot;
	} else if (strchr("wW", c)) {
		do_cmd(c);		// execute movement cmd
		if (dot > text)
			dot--;		// move back off of next word
		if (dot > text && *dot == '\n')
			dot--;		// stay off NL
		q = dot;
	} else if (strchr("H-k{", c)) {
		// these operate on multi-lines backwards
		q = end_line(dot);	// find NL
		do_cmd(c);		// execute movement cmd
		dot_begin();
		p = dot;
	} else if (strchr("L+j}\r\n", c)) {
		// these operate on multi-lines forwards
		p = begin_line(dot);
		do_cmd(c);		// execute movement cmd
		dot_end();		// find NL
		q = dot;
	} else {
		c = 27;			// error- return an ESC char
		//break;
	}
	*start = p;
	*stop = q;
	if (q < p) {
		*start = q;
		*stop = p;
	}
	dot = save_dot;
	return (c);
}

static int st_test(Byte * p, int type, int dir, Byte * tested)
{
	Byte c, c0, ci;
	int test, inc;

	inc = dir;
	c = c0 = p[0];
	ci = p[inc];
	test = 0;

	if (type == S_BEFORE_WS) {
		c = ci;
		test = ((!isspace(c)) || c == '\n');
	}
	if (type == S_TO_WS) {
		c = c0;
		test = ((!isspace(c)) || c == '\n');
	}
	if (type == S_OVER_WS) {
		c = c0;
		test = ((isspace(c)));
	}
	if (type == S_END_PUNCT) {
		c = ci;
		test = ((ispunct(c)));
	}
	if (type == S_END_ALNUM) {
		c = ci;
		test = ((isalnum(c)) || c == '_');
	}
	*tested = c;
	return (test);
}

static Byte *skip_thing(Byte * p, int linecnt, int dir, int type)
{
	Byte c;

	while (st_test(p, type, dir, &c)) {
		// make sure we limit search to correct number of lines
		if (c == '\n' && --linecnt < 1)
			break;
		if (dir >= 0 && p >= end - 1)
			break;
		if (dir < 0 && p <= text)
			break;
		p += dir;		// move to next char
	}
	return (p);
}

// find matching char of pair  ()  []  {}
static Byte *find_pair(Byte * p, Byte c)
{
	Byte match, *q;
	int dir, level;

	match = ')';
	level = 1;
	dir = 1;			// assume forward
	switch (c) {
	case '(':
		match = ')';
		break;
	case '[':
		match = ']';
		break;
	case '{':
		match = '}';
		break;
	case ')':
		match = '(';
		dir = -1;
		break;
	case ']':
		match = '[';
		dir = -1;
		break;
	case '}':
		match = '{';
		dir = -1;
		break;
	}
	for (q = p + dir; text <= q && q < end; q += dir) {
		// look for match, count levels of pairs  (( ))
		if (*q == c)
			level++;	// increase pair levels
		if (*q == match)
			level--;	// reduce pair level
		if (level == 0)
			break;		// found matching pair
	}
	if (level != 0)
		q = NULL;		// indicate no match
	return (q);
}

#ifdef CONFIG_FEATURE_VI_SETOPTS
// show the matching char of a pair,  ()  []  {}
static void showmatching(Byte * p)
{
	Byte *q, *save_dot;

	// we found half of a pair
	q = find_pair(p, *p);	// get loc of matching char
	if (q == NULL) {
		indicate_error('3');	// no matching char
	} else {
		// "q" now points to matching pair
		save_dot = dot;	// remember where we are
		dot = q;		// go to new loc
		refresh(FALSE);	// let the user see it
		(void) mysleep(40);	// give user some time
		dot = save_dot;	// go back to old loc
		refresh(FALSE);
	}
}
#endif							/* CONFIG_FEATURE_VI_SETOPTS */

//  open a hole in text[]
static Byte *text_hole_make(Byte * p, int size)	// at "p", make a 'size' byte hole
{
	Byte *src, *dest;
	int cnt;

	if (size <= 0)
		goto thm0;
	src = p;
	dest = p + size;
	cnt = end - src;	// the rest of buffer
	if (memmove(dest, src, cnt) != dest) {
		psbs("can't create room for new characters");
	}
	memset(p, ' ', size);	// clear new hole
	end = end + size;	// adjust the new END
	file_modified = TRUE;	// has the file been modified
  thm0:
	return (p);
}

//  close a hole in text[]
static Byte *text_hole_delete(Byte * p, Byte * q) // delete "p" thru "q", inclusive
{
	Byte *src, *dest;
	int cnt, hole_size;

	// move forwards, from beginning
	// assume p <= q
	src = q + 1;
	dest = p;
	if (q < p) {		// they are backward- swap them
		src = p + 1;
		dest = q;
	}
	hole_size = q - p + 1;
	cnt = end - src;
	if (src < text || src > end)
		goto thd0;
	if (dest < text || dest >= end)
		goto thd0;
	if (src >= end)
		goto thd_atend;	// just delete the end of the buffer
	if (memmove(dest, src, cnt) != dest) {
		psbs("can't delete the character");
	}
  thd_atend:
	end = end - hole_size;	// adjust the new END
	if (dest >= end)
		dest = end - 1;	// make sure dest in below end-1
	if (end <= text)
		dest = end = text;	// keep pointers valid
	file_modified = TRUE;	// has the file been modified
  thd0:
	return (dest);
}

// copy text into register, then delete text.
// if dist <= 0, do not include, or go past, a NewLine
//
static Byte *yank_delete(Byte * start, Byte * stop, int dist, int yf)
{
	Byte *p;

	// make sure start <= stop
	if (start > stop) {
		// they are backwards, reverse them
		p = start;
		start = stop;
		stop = p;
	}
	if (dist <= 0) {
		// we can not cross NL boundaries
		p = start;
		if (*p == '\n')
			return (p);
		// dont go past a NewLine
		for (; p + 1 <= stop; p++) {
			if (p[1] == '\n') {
				stop = p;	// "stop" just before NewLine
				break;
			}
		}
	}
	p = start;
#ifdef CONFIG_FEATURE_VI_YANKMARK
	text_yank(start, stop, YDreg);
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
	if (yf == YANKDEL) {
		p = text_hole_delete(start, stop);
	}					// delete lines
	return (p);
}

static void show_help(void)
{
	puts("These features are available:"
#ifdef CONFIG_FEATURE_VI_SEARCH
	"\n\tPattern searches with / and ?"
#endif							/* CONFIG_FEATURE_VI_SEARCH */
#ifdef CONFIG_FEATURE_VI_DOT_CMD
	"\n\tLast command repeat with \'.\'"
#endif							/* CONFIG_FEATURE_VI_DOT_CMD */
#ifdef CONFIG_FEATURE_VI_YANKMARK
	"\n\tLine marking with  'x"
	"\n\tNamed buffers with  \"x"
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
#ifdef CONFIG_FEATURE_VI_READONLY
	"\n\tReadonly if vi is called as \"view\""
	"\n\tReadonly with -R command line arg"
#endif							/* CONFIG_FEATURE_VI_READONLY */
#ifdef CONFIG_FEATURE_VI_SET
	"\n\tSome colon mode commands with \':\'"
#endif							/* CONFIG_FEATURE_VI_SET */
#ifdef CONFIG_FEATURE_VI_SETOPTS
	"\n\tSettable options with \":set\""
#endif							/* CONFIG_FEATURE_VI_SETOPTS */
#ifdef CONFIG_FEATURE_VI_USE_SIGNALS
	"\n\tSignal catching- ^C"
	"\n\tJob suspend and resume with ^Z"
#endif							/* CONFIG_FEATURE_VI_USE_SIGNALS */
#ifdef CONFIG_FEATURE_VI_WIN_RESIZE
	"\n\tAdapt to window re-sizes"
#endif							/* CONFIG_FEATURE_VI_WIN_RESIZE */
	);
}

static void print_literal(Byte * buf, Byte * s) // copy s to buf, convert unprintable
{
	Byte c, b[2];

	b[1] = '\0';
	strcpy((char *) buf, "");	// init buf
	if (strlen((char *) s) <= 0)
		s = (Byte *) "(NULL)";
	for (; *s > '\0'; s++) {
		c = *s;
		if (*s > '~') {
			strcat((char *) buf, SOs);
			c = *s - 128;
		}
		if (*s < ' ') {
			strcat((char *) buf, "^");
			c += '@';
		}
		b[0] = c;
		strcat((char *) buf, (char *) b);
		if (*s > '~')
			strcat((char *) buf, SOn);
		if (*s == '\n') {
			strcat((char *) buf, "$");
		}
	}
}

#ifdef CONFIG_FEATURE_VI_DOT_CMD
static void start_new_cmd_q(Byte c)
{
	// release old cmd
	if (last_modifying_cmd != 0)
		free(last_modifying_cmd);
	// get buffer for new cmd
	last_modifying_cmd = (Byte *) xmalloc(BUFSIZ);
	memset(last_modifying_cmd, '\0', BUFSIZ);	// clear new cmd queue
	// if there is a current cmd count put it in the buffer first
	if (cmdcnt > 0)
		sprintf((char *) last_modifying_cmd, "%d", cmdcnt);
	// save char c onto queue
	last_modifying_cmd[strlen((char *) last_modifying_cmd)] = c;
	adding2q = 1;
	return;
}

static void end_cmd_q(void)
{
#ifdef CONFIG_FEATURE_VI_YANKMARK
	YDreg = 26;			// go back to default Yank/Delete reg
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
	adding2q = 0;
	return;
}
#endif							/* CONFIG_FEATURE_VI_DOT_CMD */

#if defined(CONFIG_FEATURE_VI_YANKMARK) || defined(CONFIG_FEATURE_VI_COLON) || defined(CONFIG_FEATURE_VI_CRASHME)
static Byte *string_insert(Byte * p, Byte * s) // insert the string at 'p'
{
	int cnt, i;

	i = strlen((char *) s);
	p = text_hole_make(p, i);
	strncpy((char *) p, (char *) s, i);
	for (cnt = 0; *s != '\0'; s++) {
		if (*s == '\n')
			cnt++;
	}
#ifdef CONFIG_FEATURE_VI_YANKMARK
	psb("Put %d lines (%d chars) from [%c]", cnt, i, what_reg());
#endif							/* CONFIG_FEATURE_VI_YANKMARK */
	return (p);
}
#endif							/* CONFIG_FEATURE_VI_YANKMARK || CONFIG_FEATURE_VI_COLON || CONFIG_FEATURE_VI_CRASHME */

#ifdef CONFIG_FEATURE_VI_YANKMARK
static Byte *text_yank(Byte * p, Byte * q, int dest)	// copy text into a register
{
	Byte *t;
	int cnt;

	if (q < p) {		// they are backwards- reverse them
		t = q;
		q = p;
		p = t;
	}
	cnt = q - p + 1;
	t = reg[dest];
	if (t != 0) {		// if already a yank register
		free(t);		//   free it
	}
	t = (Byte *) xmalloc(cnt + 1);	// get a new register
	memset(t, '\0', cnt + 1);	// clear new text[]
	strncpy((char *) t, (char *) p, cnt);	// copy text[] into bufer
	reg[dest] = t;
	return (p);
}

static Byte what_reg(void)
{
	Byte c;
	int i;

	i = 0;
	c = 'D';			// default to D-reg
	if (0 <= YDreg && YDreg <= 25)
		c = 'a' + (Byte) YDreg;
	if (YDreg == 26)
		c = 'D';
	if (YDreg == 27)
		c = 'U';
	return (c);
}

static void check_context(Byte cmd)
{
	// A context is defined to be "modifying text"
	// Any modifying command establishes a new context.

	if (dot < context_start || dot > context_end) {
		if (strchr((char *) modifying_cmds, cmd) != NULL) {
			// we are trying to modify text[]- make this the current context
			mark[27] = mark[26];	// move cur to prev
			mark[26] = dot;	// move local to cur
			context_start = prev_line(prev_line(dot));
			context_end = next_line(next_line(dot));
			//loiter= start_loiter= now;
		}
	}
	return;
}

static Byte *swap_context(Byte * p) // goto new context for '' command make this the current context
{
	Byte *tmp;

	// the current context is in mark[26]
	// the previous context is in mark[27]
	// only swap context if other context is valid
	if (text <= mark[27] && mark[27] <= end - 1) {
		tmp = mark[27];
		mark[27] = mark[26];
		mark[26] = tmp;
		p = mark[26];	// where we are going- previous context
		context_start = prev_line(prev_line(prev_line(p)));
		context_end = next_line(next_line(next_line(p)));
	}
	return (p);
}
#endif							/* CONFIG_FEATURE_VI_YANKMARK */

static int isblnk(Byte c) // is the char a blank or tab
{
	return (c == ' ' || c == '\t');
}

//----- Set terminal attributes --------------------------------
static void rawmode(void)
{
	tcgetattr(0, &term_orig);
	term_vi = term_orig;
	term_vi.c_lflag &= (~ICANON & ~ECHO);	// leave ISIG ON- allow intr's
	term_vi.c_iflag &= (~IXON & ~ICRNL);
	term_vi.c_oflag &= (~ONLCR);
#ifndef linux
	term_vi.c_cc[VMIN] = 1;
	term_vi.c_cc[VTIME] = 0;
#endif
	erase_char = term_vi.c_cc[VERASE];
	tcsetattr(0, TCSANOW, &term_vi);
}

static void cookmode(void)
{
	tcsetattr(0, TCSANOW, &term_orig);
}

#ifdef CONFIG_FEATURE_VI_WIN_RESIZE
//----- See what the window size currently is --------------------
static void window_size_get(int sig)
{
	int i;

	i = ioctl(0, TIOCGWINSZ, &winsize);
	if (i != 0) {
		// force 24x80
		winsize.ws_row = 24;
		winsize.ws_col = 80;
	}
	if (winsize.ws_row <= 1) {
		winsize.ws_row = 24;
	}
	if (winsize.ws_col <= 1) {
		winsize.ws_col = 80;
	}
	rows = (int) winsize.ws_row;
	columns = (int) winsize.ws_col;
}
#endif							/* CONFIG_FEATURE_VI_WIN_RESIZE */

//----- Come here when we get a window resize signal ---------
#ifdef CONFIG_FEATURE_VI_USE_SIGNALS
static void winch_sig(int sig)
{
	signal(SIGWINCH, winch_sig);
#ifdef CONFIG_FEATURE_VI_WIN_RESIZE
	window_size_get(0);
#endif							/* CONFIG_FEATURE_VI_WIN_RESIZE */
	new_screen(rows, columns);	// get memory for virtual screen
	redraw(TRUE);		// re-draw the screen
}

//----- Come here when we get a continue signal -------------------
static void cont_sig(int sig)
{
	rawmode();			// terminal to "raw"
	*status_buffer = '\0';	// clear the status buffer
	redraw(TRUE);		// re-draw the screen

	signal(SIGTSTP, suspend_sig);
	signal(SIGCONT, SIG_DFL);
	kill(getpid(), SIGCONT);
}

//----- Come here when we get a Suspend signal -------------------
static void suspend_sig(int sig)
{
	place_cursor(rows - 1, 0, FALSE);	// go to bottom of screen
	clear_to_eol();		// Erase to end of line
	cookmode();			// terminal to "cooked"

	signal(SIGCONT, cont_sig);
	signal(SIGTSTP, SIG_DFL);
	kill(getpid(), SIGTSTP);
}

//----- Come here when we get a signal ---------------------------
static void catch_sig(int sig)
{
	signal(SIGHUP, catch_sig);
	signal(SIGINT, catch_sig);
	signal(SIGTERM, catch_sig);
	longjmp(restart, sig);
}

static void alarm_sig(int sig)
{
	signal(SIGALRM, catch_sig);
	longjmp(restart, sig);
}

//----- Come here when we get a core dump signal -----------------
static void core_sig(int sig)
{
	signal(SIGQUIT, core_sig);
	signal(SIGILL, core_sig);
	signal(SIGTRAP, core_sig);
	signal(SIGIOT, core_sig);
	signal(SIGABRT, core_sig);
	signal(SIGFPE, core_sig);
	signal(SIGBUS, core_sig);
	signal(SIGSEGV, core_sig);
#ifdef SIGSYS
	signal(SIGSYS, core_sig);
#endif

	dot = bound_dot(dot);	// make sure "dot" is valid

	longjmp(restart, sig);
}
#endif							/* CONFIG_FEATURE_VI_USE_SIGNALS */

static int mysleep(int hund)	// sleep for 'h' 1/100 seconds
{
	// Don't hang- Wait 5/100 seconds-  1 Sec= 1000000
	FD_ZERO(&rfds);
	FD_SET(0, &rfds);
	tv.tv_sec = 0;
	tv.tv_usec = hund * 10000;
	select(1, &rfds, NULL, NULL, &tv);
	return (FD_ISSET(0, &rfds));
}

//----- IO Routines --------------------------------------------
static Byte readit(void)	// read (maybe cursor) key from stdin
{
	Byte c;
	int i, bufsiz, cnt, cmdindex;
	struct esc_cmds {
		Byte *seq;
		Byte val;
	};

	static struct esc_cmds esccmds[] = {
		{(Byte *) "OA", (Byte) VI_K_UP},	// cursor key Up
		{(Byte *) "OB", (Byte) VI_K_DOWN},	// cursor key Down
		{(Byte *) "OC", (Byte) VI_K_RIGHT},	// Cursor Key Right
		{(Byte *) "OD", (Byte) VI_K_LEFT},	// cursor key Left
		{(Byte *) "OH", (Byte) VI_K_HOME},	// Cursor Key Home
		{(Byte *) "OF", (Byte) VI_K_END},	// Cursor Key End
		{(Byte *) "", (Byte) VI_K_UP},	// cursor key Up
		{(Byte *) "", (Byte) VI_K_DOWN},	// cursor key Down
		{(Byte *) "", (Byte) VI_K_RIGHT},	// Cursor Key Right
		{(Byte *) "", (Byte) VI_K_LEFT},	// cursor key Left
		{(Byte *) "", (Byte) VI_K_HOME},	// Cursor Key Home
		{(Byte *) "", (Byte) VI_K_END},	// Cursor Key End
		{(Byte *) "[2~", (Byte) VI_K_INSERT},	// Cursor Key Insert
		{(Byte *) "[5~", (Byte) VI_K_PAGEUP},	// Cursor Key Page Up
		{(Byte *) "[6~", (Byte) VI_K_PAGEDOWN},	// Cursor Key Page Down
		{(Byte *) "OP", (Byte) VI_K_FUN1},	// Function Key F1
		{(Byte *) "OQ", (Byte) VI_K_FUN2},	// Function Key F2
		{(Byte *) "OR", (Byte) VI_K_FUN3},	// Function Key F3
		{(Byte *) "OS", (Byte) VI_K_FUN4},	// Function Key F4
		{(Byte *) "[15~", (Byte) VI_K_FUN5},	// Function Key F5
		{(Byte *) "[17~", (Byte) VI_K_FUN6},	// Function Key F6
		{(Byte *) "[18~", (Byte) VI_K_FUN7},	// Function Key F7
		{(Byte *) "[19~", (Byte) VI_K_FUN8},	// Function Key F8
		{(Byte *) "[20~", (Byte) VI_K_FUN9},	// Function Key F9
		{(Byte *) "[21~", (Byte) VI_K_FUN10},	// Function Key F10
		{(Byte *) "[23~", (Byte) VI_K_FUN11},	// Function Key F11
		{(Byte *) "[24~", (Byte) VI_K_FUN12},	// Function Key F12
		{(Byte *) "[11~", (Byte) VI_K_FUN1},	// Function Key F1
		{(Byte *) "[12~", (Byte) VI_K_FUN2},	// Function Key F2
		{(Byte *) "[13~", (Byte) VI_K_FUN3},	// Function Key F3
		{(Byte *) "[14~", (Byte) VI_K_FUN4},	// Function Key F4
	};

#define ESCCMDS_COUNT (sizeof(esccmds)/sizeof(struct esc_cmds))

	(void) alarm(0);	// turn alarm OFF while we wait for input
	// get input from User- are there already input chars in Q?
	bufsiz = strlen((char *) readbuffer);
	if (bufsiz <= 0) {
	  ri0:
		// the Q is empty, wait for a typed char
		bufsiz = read(0, readbuffer, BUFSIZ - 1);
		if (bufsiz < 0) {
			if (errno == EINTR)
				goto ri0;	// interrupted sys call
			if (errno == EBADF)
				editing = 0;
			if (errno == EFAULT)
				editing = 0;
			if (errno == EINVAL)
				editing = 0;
			if (errno == EIO)
				editing = 0;
			errno = 0;
			bufsiz = 0;
		}
		readbuffer[bufsiz] = '\0';
	}
	// return char if it is not part of ESC sequence
	if (readbuffer[0] != 27)
		goto ri1;

	// This is an ESC char. Is this Esc sequence?
	// Could be bare Esc key. See if there are any
	// more chars to read after the ESC. This would
	// be a Function or Cursor Key sequence.
	FD_ZERO(&rfds);
	FD_SET(0, &rfds);
	tv.tv_sec = 0;
	tv.tv_usec = 50000;	// Wait 5/100 seconds- 1 Sec=1000000

	// keep reading while there are input chars and room in buffer
	while (select(1, &rfds, NULL, NULL, &tv) > 0 && bufsiz <= (BUFSIZ - 5)) {
		// read the rest of the ESC string
		i = read(0, (void *) (readbuffer + bufsiz), BUFSIZ - bufsiz);
		if (i > 0) {
			bufsiz += i;
			readbuffer[bufsiz] = '\0';	// Terminate the string
		}
	}
	// Maybe cursor or function key?
	for (cmdindex = 0; cmdindex < ESCCMDS_COUNT; cmdindex++) {
		cnt = strlen((char *) esccmds[cmdindex].seq);
		i = strncmp((char *) esccmds[cmdindex].seq, (char *) readbuffer, cnt);
		if (i == 0) {
			// is a Cursor key- put derived value back into Q
			readbuffer[0] = esccmds[cmdindex].val;
			// squeeze out the ESC sequence
			for (i = 1; i < cnt; i++) {
				memmove(readbuffer + 1, readbuffer + 2, BUFSIZ - 2);
				readbuffer[BUFSIZ - 1] = '\0';
			}
			break;
		}
	}
  ri1:
	c = readbuffer[0];
	// remove one char from Q
	memmove(readbuffer, readbuffer + 1, BUFSIZ - 1);
	readbuffer[BUFSIZ - 1] = '\0';
	(void) alarm(3);	// we are done waiting for input, turn alarm ON
	return (c);
}

//----- IO Routines --------------------------------------------
static Byte get_one_char()
{
	static Byte c;

#ifdef CONFIG_FEATURE_VI_DOT_CMD
	// ! adding2q  && ioq == 0  read()
	// ! adding2q  && ioq != 0  *ioq
	// adding2q         *last_modifying_cmd= read()
	if (!adding2q) {
		// we are not adding to the q.
		// but, we may be reading from a q
		if (ioq == 0) {
			// there is no current q, read from STDIN
			c = readit();	// get the users input
		} else {
			// there is a queue to get chars from first
			c = *ioq++;
			if (c == '\0') {
				// the end of the q, read from STDIN
				free(ioq_start);
				ioq_start = ioq = 0;
				c = readit();	// get the users input
			}
		}
	} else {
		// adding STDIN chars to q
		c = readit();	// get the users input
		if (last_modifying_cmd != 0) {
			// add new char to q
			last_modifying_cmd[strlen((char *) last_modifying_cmd)] = c;
		}
	}
#else							/* CONFIG_FEATURE_VI_DOT_CMD */
	c = readit();		// get the users input
#endif							/* CONFIG_FEATURE_VI_DOT_CMD */
	return (c);			// return the char, where ever it came from
}

static Byte *get_input_line(Byte * prompt) // get input line- use "status line"
{
	Byte buf[BUFSIZ];
	Byte c;
	int i;
	static Byte *obufp = NULL;

	strcpy((char *) buf, (char *) prompt);
	*status_buffer = '\0';	// clear the status buffer
	place_cursor(rows - 1, 0, FALSE);	// go to Status line, bottom of screen
	clear_to_eol();		// clear the line
	write(1, prompt, strlen((char *) prompt));	// write out the :, /, or ? prompt

	for (i = strlen((char *) buf); i < BUFSIZ;) {
		c = get_one_char();	// read user input
		if (c == '\n' || c == '\r' || c == 27)
			break;		// is this end of input
		if (c == erase_char) {	// user wants to erase prev char
			i--;		// backup to prev char
			buf[i] = '\0';	// erase the char
			buf[i + 1] = '\0';	// null terminate buffer
			write(1, " ", 3);	// erase char on screen
			if (i <= 0) {	// user backs up before b-o-l, exit
				break;
			}
		} else {
			buf[i] = c;	// save char in buffer
			buf[i + 1] = '\0';	// make sure buffer is null terminated
			write(1, buf + i, 1);	// echo the char back to user
			i++;
		}
	}
	refresh(FALSE);
	if (obufp != NULL)
		free(obufp);
	obufp = (Byte *) xstrdup((char *) buf);
	return (obufp);
}

static int file_size(Byte * fn) // what is the byte size of "fn"
{
	struct stat st_buf;
	int cnt, sr;

	if (fn == 0 || strlen(fn) <= 0)
		return (-1);
	cnt = -1;
	sr = stat((char *) fn, &st_buf);	// see if file exists
	if (sr >= 0) {
		cnt = (int) st_buf.st_size;
	}
	return (cnt);
}

static int file_insert(Byte * fn, Byte * p, int size)
{
	int fd, cnt;

	cnt = -1;
#ifdef CONFIG_FEATURE_VI_READONLY
	readonly = FALSE;
#endif							/* CONFIG_FEATURE_VI_READONLY */
	if (fn == 0 || strlen((char*) fn) <= 0) {
		psbs("No filename given");
		goto fi0;
	}
	if (size == 0) {
		// OK- this is just a no-op
		cnt = 0;
		goto fi0;
	}
	if (size < 0) {
		psbs("Trying to insert a negative number (%d) of characters", size);
		goto fi0;
	}
	if (p < text || p > end) {
		psbs("Trying to insert file outside of memory");
		goto fi0;
	}

	// see if we can open the file
#ifdef CONFIG_FEATURE_VI_READONLY
	if (vi_readonly) goto fi1;		// do not try write-mode
#endif
	fd = open((char *) fn, O_RDWR);			// assume read & write
	if (fd < 0) {
		// could not open for writing- maybe file is read only
#ifdef CONFIG_FEATURE_VI_READONLY
  fi1:
#endif
		fd = open((char *) fn, O_RDONLY);	// try read-only
		if (fd < 0) {
			psbs("\"%s\" %s", fn, "could not open file");
			goto fi0;
		}
#ifdef CONFIG_FEATURE_VI_READONLY
		// got the file- read-only
		readonly = TRUE;
#endif							/* CONFIG_FEATURE_VI_READONLY */
	}
	p = text_hole_make(p, size);
	cnt = read(fd, p, size);
	close(fd);
	if (cnt < 0) {
		cnt = -1;
		p = text_hole_delete(p, p + size - 1);	// un-do buffer insert
		psbs("could not read file \"%s\"", fn);
	} else if (cnt < size) {
		// There was a partial read, shrink unused space text[]
		p = text_hole_delete(p + cnt, p + (size - cnt) - 1);	// un-do buffer insert
		psbs("could not read all of file \"%s\"", fn);
	}
	if (cnt >= size)
		file_modified = TRUE;
  fi0:
	return (cnt);
}

static int file_write(Byte * fn, Byte * first, Byte * last)
{
	int fd, cnt, charcnt;

	if (fn == 0) {
		psbs("No current filename");
		return (-1);
	}
	charcnt = 0;
	// FIXIT- use the correct umask()
	fd = open((char *) fn, (O_WRONLY | O_CREAT | O_TRUNC), 0664);
	if (fd < 0)
		return (-1);
	cnt = last - first + 1;
	charcnt = write(fd, first, cnt);
	if (charcnt == cnt) {
		// good write
		//file_modified= FALSE; // the file has not been modified
	} else {
		charcnt = 0;
	}
	close(fd);
	return (charcnt);
}

//----- Terminal Drawing ---------------------------------------
// The terminal is made up of 'rows' line of 'columns' columns.
// classicly this would be 24 x 80.
//  screen coordinates
//  0,0     ...     0,79
//  1,0     ...     1,79
//  .       ...     .
//  .       ...     .
//  22,0    ...     22,79
//  23,0    ...     23,79   status line
//

//----- Move the cursor to row x col (count from 0, not 1) -------
static void place_cursor(int row, int col, int opti)
{
	char cm1[BUFSIZ];
	char *cm;
	int l;
#ifdef CONFIG_FEATURE_VI_OPTIMIZE_CURSOR
	char cm2[BUFSIZ];
	Byte *screenp;
	// char cm3[BUFSIZ];
	int Rrow= last_row;
#endif							/* CONFIG_FEATURE_VI_OPTIMIZE_CURSOR */
	
	memset(cm1, '\0', BUFSIZ - 1);  // clear the buffer

	if (row < 0) row = 0;
	if (row >= rows) row = rows - 1;
	if (col < 0) col = 0;
	if (col >= columns) col = columns - 1;
	
	//----- 1.  Try the standard terminal ESC sequence
	sprintf((char *) cm1, CMrc, row + 1, col + 1);
	cm= cm1;
	if (! opti) goto pc0;

#ifdef CONFIG_FEATURE_VI_OPTIMIZE_CURSOR
	//----- find the minimum # of chars to move cursor -------------
	//----- 2.  Try moving with discreet chars (Newline, [back]space, ...)
	memset(cm2, '\0', BUFSIZ - 1);  // clear the buffer
	
	// move to the correct row
	while (row < Rrow) {
		// the cursor has to move up
		strcat(cm2, CMup);
		Rrow--;
	}
	while (row > Rrow) {
		// the cursor has to move down
		strcat(cm2, CMdown);
		Rrow++;
	}
	
	// now move to the correct column
	strcat(cm2, "\r");			// start at col 0
	// just send out orignal source char to get to correct place
	screenp = &screen[row * columns];	// start of screen line
	strncat(cm2, screenp, col);

	//----- 3.  Try some other way of moving cursor
	//---------------------------------------------

	// pick the shortest cursor motion to send out
	cm= cm1;
	if (strlen(cm2) < strlen(cm)) {
		cm= cm2;
	}  /* else if (strlen(cm3) < strlen(cm)) {
		cm= cm3;
	} */
#endif							/* CONFIG_FEATURE_VI_OPTIMIZE_CURSOR */
  pc0:
	l= strlen(cm);
	if (l) write(1, cm, l);			// move the cursor
}

//----- Erase from cursor to end of line -----------------------
static void clear_to_eol()
{
	write(1, Ceol, strlen(Ceol));	// Erase from cursor to end of line
}

//----- Erase from cursor to end of screen -----------------------
static void clear_to_eos()
{
	write(1, Ceos, strlen(Ceos));	// Erase from cursor to end of screen
}

//----- Start standout mode ------------------------------------
static void standout_start() // send "start reverse video" sequence
{
	write(1, SOs, strlen(SOs));	// Start reverse video mode
}

//----- End standout mode --------------------------------------
static void standout_end() // send "end reverse video" sequence
{
	write(1, SOn, strlen(SOn));	// End reverse video mode
}

//----- Flash the screen  --------------------------------------
static void flash(int h)
{
	standout_start();	// send "start reverse video" sequence
	redraw(TRUE);
	(void) mysleep(h);
	standout_end();		// send "end reverse video" sequence
	redraw(TRUE);
}

static void beep()
{
	write(1, bell, strlen(bell));	// send out a bell character
}

static void indicate_error(char c)
{
#ifdef CONFIG_FEATURE_VI_CRASHME
	if (crashme > 0)
		return;			// generate a random command
#endif							/* CONFIG_FEATURE_VI_CRASHME */
	if (err_method == 0) {
		beep();
	} else {
		flash(10);
	}
}

//----- Screen[] Routines --------------------------------------
//----- Erase the Screen[] memory ------------------------------
static void screen_erase()
{
	memset(screen, ' ', screensize);	// clear new screen
}

//----- Draw the status line at bottom of the screen -------------
static void show_status_line(void)
{
	static int last_cksum;
	int l, cnt, cksum;

	cnt = strlen((char *) status_buffer);
	for (cksum= l= 0; l < cnt; l++) { cksum += (int)(status_buffer[l]); }
	// don't write the status line unless it changes
	if (cnt > 0 && last_cksum != cksum) {
		last_cksum= cksum;		// remember if we have seen this line
		place_cursor(rows - 1, 0, FALSE);	// put cursor on status line
		write(1, status_buffer, cnt);
		clear_to_eol();
		place_cursor(crow, ccol, FALSE);	// put cursor back in correct place
	}
}

//----- format the status buffer, the bottom line of screen ------
// print status buffer, with STANDOUT mode
static void psbs(char *format, ...)
{
	va_list args;

	va_start(args, format);
	strcpy((char *) status_buffer, SOs);	// Terminal standout mode on
	vsprintf((char *) status_buffer + strlen((char *) status_buffer), format,
			 args);
	strcat((char *) status_buffer, SOn);	// Terminal standout mode off
	va_end(args);

	return;
}

// print status buffer
static void psb(char *format, ...)
{
	va_list args;

	va_start(args, format);
	vsprintf((char *) status_buffer, format, args);
	va_end(args);
	return;
}

static void ni(Byte * s) // display messages
{
	Byte buf[BUFSIZ];

	print_literal(buf, s);
	psbs("\'%s\' is not implemented", buf);
}

static void edit_status(void)	// show file status on status line
{
	int cur, tot, percent;

	cur = count_lines(text, dot);
	tot = count_lines(text, end - 1);
	//    current line         percent
	//   -------------    ~~ ----------
	//    total lines            100
	if (tot > 0) {
		percent = (100 * cur) / tot;
	} else {
		cur = tot = 0;
		percent = 100;
	}
	psb("\"%s\""
#ifdef CONFIG_FEATURE_VI_READONLY
		"%s"
#endif							/* CONFIG_FEATURE_VI_READONLY */
		"%s line %d of %d --%d%%--",
		(cfn != 0 ? (char *) cfn : "No file"),
#ifdef CONFIG_FEATURE_VI_READONLY
		((vi_readonly || readonly) ? " [Read only]" : ""),
#endif							/* CONFIG_FEATURE_VI_READONLY */
		(file_modified ? " [modified]" : ""),
		cur, tot, percent);
}

//----- Force refresh of all Lines -----------------------------
static void redraw(int full_screen)
{
	place_cursor(0, 0, FALSE);	// put cursor in correct place
	clear_to_eos();		// tel terminal to erase display
	screen_erase();		// erase the internal screen buffer
	refresh(full_screen);	// this will redraw the entire display
}

//----- Format a text[] line into a buffer ---------------------
static void format_line(Byte *dest, Byte *src, int li)
{
	int co;
	Byte c;
	
	for (co= 0; co < MAX_SCR_COLS; co++) {
		c= ' ';		// assume blank
		if (li > 0 && co == 0) {
			c = '~';        // not first line, assume Tilde
		}
		// are there chars in text[] and have we gone past the end
		if (text < end && src < end) {
			c = *src++;
		}
		if (c == '\n')
			break;
		if (c < ' ' || c > '~') {
			if (c == '\t') {
				c = ' ';
				//       co %    8     !=     7
				for (; (co % tabstop) != (tabstop - 1); co++) {
					dest[co] = c;
				}
			} else {
				dest[co++] = '^';
				c |= '@';       // make it visible
				c &= 0x7f;      // get rid of hi bit
			}
		}
		// the co++ is done here so that the column will
		// not be overwritten when we blank-out the rest of line
		dest[co] = c;
		if (src >= end)
			break;
	}
}

//----- Refresh the changed screen lines -----------------------
// Copy the source line from text[] into the buffer and note
// if the current screenline is different from the new buffer.
// If they differ then that line needs redrawing on the terminal.
//
static void refresh(int full_screen)
{
	static int old_offset;
	int li, changed;
	Byte buf[MAX_SCR_COLS];
	Byte *tp, *sp;		// pointer into text[] and screen[]
#ifdef CONFIG_FEATURE_VI_OPTIMIZE_CURSOR
	int last_li= -2;				// last line that changed- for optimizing cursor movement
#endif							/* CONFIG_FEATURE_VI_OPTIMIZE_CURSOR */

#ifdef CONFIG_FEATURE_VI_WIN_RESIZE
	window_size_get(0);
#endif							/* CONFIG_FEATURE_VI_WIN_RESIZE */
	sync_cursor(dot, &crow, &ccol);	// where cursor will be (on "dot")
	tp = screenbegin;	// index into text[] of top line

	// compare text[] to screen[] and mark screen[] lines that need updating
	for (li = 0; li < rows - 1; li++) {
		int cs, ce;				// column start & end
		memset(buf, ' ', MAX_SCR_COLS);		// blank-out the buffer
		buf[MAX_SCR_COLS-1] = 0;		// NULL terminate the buffer
		// format current text line into buf
		format_line(buf, tp, li);

		// skip to the end of the current text[] line
		while (tp < end && *tp++ != '\n') /*no-op*/ ;

		// see if there are any changes between vitual screen and buf
		changed = FALSE;	// assume no change
		cs= 0;
		ce= columns-1;
		sp = &screen[li * columns];	// start of screen line
		if (full_screen) {
			// force re-draw of every single column from 0 - columns-1
			goto re0;
		}
		// compare newly formatted buffer with virtual screen
		// look forward for first difference between buf and screen
		for ( ; cs <= ce; cs++) {
			if (buf[cs + offset] != sp[cs]) {
				changed = TRUE;	// mark for redraw
				break;
			}
		}

		// look backward for last difference between buf and screen
		for ( ; ce >= cs; ce--) {
			if (buf[ce + offset] != sp[ce]) {
				changed = TRUE;	// mark for redraw
				break;
			}
		}
		// now, cs is index of first diff, and ce is index of last diff

		// if horz offset has changed, force a redraw
		if (offset != old_offset) {
  re0:
			changed = TRUE;
		}

		// make a sanity check of columns indexes
		if (cs < 0) cs= 0;
		if (ce > columns-1) ce= columns-1;
		if (cs > ce) {  cs= 0;  ce= columns-1;  }
		// is there a change between vitual screen and buf
		if (changed) {
			//  copy changed part of buffer to virtual screen
			memmove(sp+cs, buf+(cs+offset), ce-cs+1);

			// move cursor to column of first change
			if (offset != old_offset) {
				// opti_cur_move is still too stupid
				// to handle offsets correctly
				place_cursor(li, cs, FALSE);
			} else {
#ifdef CONFIG_FEATURE_VI_OPTIMIZE_CURSOR
				// if this just the next line
				//  try to optimize cursor movement
				//  otherwise, use standard ESC sequence
				place_cursor(li, cs, li == (last_li+1) ? TRUE : FALSE);
				last_li= li;
#else							/* CONFIG_FEATURE_VI_OPTIMIZE_CURSOR */
				place_cursor(li, cs, FALSE);	// use standard ESC sequence
#endif							/* CONFIG_FEATURE_VI_OPTIMIZE_CURSOR */
			}

			// write line out to terminal
			write(1, sp+cs, ce-cs+1);
#ifdef CONFIG_FEATURE_VI_OPTIMIZE_CURSOR
			last_row = li;
#endif							/* CONFIG_FEATURE_VI_OPTIMIZE_CURSOR */
		}
	}

#ifdef CONFIG_FEATURE_VI_OPTIMIZE_CURSOR
	place_cursor(crow, ccol, (crow == last_row) ? TRUE : FALSE);
	last_row = crow;
#else
	place_cursor(crow, ccol, FALSE);
#endif							/* CONFIG_FEATURE_VI_OPTIMIZE_CURSOR */
	
	if (offset != old_offset)
		old_offset = offset;
}