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
|
/* vi: set sw=4 ts=4: */
/*
* Mini date implementation for busybox
*
* by Matthew Grant <grantma@anathoth.gen.nz>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdlib.h>
#include <errno.h>
#include <sys/time.h>
#include <unistd.h>
#include <time.h>
#include <stdio.h>
#include <string.h>
#include <getopt.h>
#include "busybox.h"
#define BB_DECLARE_EXTERN
#define bb_need_invalid_date
#define bb_need_memory_exhausted
#include "messages.c"
/* This 'date' command supports only 2 time setting formats,
all the GNU strftime stuff (its in libc, lets use it),
setting time using UTC and displaying int, as well as
an RFC 822 complient date output for shell scripting
mail commands */
/* Input parsing code is always bulky - used heavy duty libc stuff as
much as possible, missed out a lot of bounds checking */
/* Default input handling to save suprising some people */
struct tm *date_conv_time(struct tm *tm_time, const char *t_string)
{
int nr;
nr = sscanf(t_string, "%2d%2d%2d%2d%d",
&(tm_time->tm_mon),
&(tm_time->tm_mday),
&(tm_time->tm_hour),
&(tm_time->tm_min), &(tm_time->tm_year));
if (nr < 4 || nr > 5) {
error_msg_and_die(invalid_date, t_string);
}
/* correct for century - minor Y2K problem here? */
if (tm_time->tm_year >= 1900)
tm_time->tm_year -= 1900;
/* adjust date */
tm_time->tm_mon -= 1;
return (tm_time);
}
/* The new stuff for LRP */
struct tm *date_conv_ftime(struct tm *tm_time, const char *t_string)
{
struct tm t;
/* Parse input and assign appropriately to tm_time */
if (t=*tm_time,sscanf(t_string, "%d:%d:%d",
&t.tm_hour, &t.tm_min, &t.tm_sec) == 3) {
/* no adjustments needed */
} else if (t=*tm_time,sscanf(t_string, "%d:%d",
&t.tm_hour, &t.tm_min) == 2) {
/* no adjustments needed */
} else if (t=*tm_time,sscanf(t_string, "%d.%d-%d:%d:%d",
&t.tm_mon,
&t.tm_mday,
&t.tm_hour,
&t.tm_min, &t.tm_sec) == 5) {
t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
} else if (t=*tm_time,sscanf(t_string, "%d.%d-%d:%d",
&t.tm_mon,
&t.tm_mday,
&t.tm_hour, &t.tm_min) == 4) {
t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
} else if (t=*tm_time,sscanf(t_string, "%d.%d.%d-%d:%d:%d",
&t.tm_year,
&t.tm_mon,
&t.tm_mday,
&t.tm_hour,
&t.tm_min, &t.tm_sec) == 6) {
t.tm_year -= 1900; /* Adjust years */
t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
} else if (t=*tm_time,sscanf(t_string, "%d.%d.%d-%d:%d",
&t.tm_year,
&t.tm_mon,
&t.tm_mday,
&t.tm_hour, &t.tm_min) == 5) {
t.tm_year -= 1900; /* Adjust years */
t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
} else {
error_msg_and_die(invalid_date, t_string);
}
*tm_time = t;
return (tm_time);
}
int date_main(int argc, char **argv)
{
char *date_str = NULL;
char *date_fmt = NULL;
char *t_buff;
int c;
int set_time = 0;
int rfc822 = 0;
int utc = 0;
int use_arg = 0;
time_t tm;
struct tm tm_time;
/* Interpret command line args */
while ((c = getopt(argc, argv, "Rs:ud:")) != EOF) {
switch (c) {
case 'R':
rfc822 = 1;
break;
case 's':
set_time = 1;
if ((date_str != NULL) || ((date_str = optarg) == NULL)) {
show_usage();
}
break;
case 'u':
utc = 1;
if (putenv("TZ=UTC0") != 0)
error_msg_and_die(memory_exhausted);
break;
case 'd':
use_arg = 1;
if ((date_str != NULL) || ((date_str = optarg) == NULL))
show_usage();
break;
default:
show_usage();
}
}
if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+'))
date_fmt = &argv[optind][1]; /* Skip over the '+' */
else if (date_str == NULL) {
set_time = 1;
date_str = argv[optind];
}
#if 0
else {
error_msg("date_str='%s' date_fmt='%s'\n", date_str, date_fmt);
show_usage();
}
#endif
/* Now we have parsed all the information except the date format
which depends on whether the clock is being set or read */
time(&tm);
memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
/* Zero out fields - take her back to midnight! */
if (date_str != NULL) {
tm_time.tm_sec = 0;
tm_time.tm_min = 0;
tm_time.tm_hour = 0;
}
/* Process any date input to UNIX time since 1 Jan 1970 */
if (date_str != NULL) {
if (strchr(date_str, ':') != NULL) {
date_conv_ftime(&tm_time, date_str);
} else {
date_conv_time(&tm_time, date_str);
}
/* Correct any day of week and day of year etc fields */
tm = mktime(&tm_time);
if (tm < 0)
error_msg_and_die(invalid_date, date_str);
if ( utc ) {
if (putenv("TZ=UTC0") != 0)
error_msg_and_die(memory_exhausted);
}
/* if setting time, set it */
if (set_time) {
if (stime(&tm) < 0) {
perror_msg("cannot set date");
}
}
}
/* Display output */
/* Deal with format string */
if (date_fmt == NULL) {
date_fmt = (rfc822
? (utc
? "%a, %_d %b %Y %H:%M:%S GMT"
: "%a, %_d %b %Y %H:%M:%S %z")
: "%a %b %e %H:%M:%S %Z %Y");
} else if (*date_fmt == '\0') {
/* Imitate what GNU 'date' does with NO format string! */
printf("\n");
return EXIT_SUCCESS;
}
/* Handle special conversions */
if (strncmp(date_fmt, "%f", 2) == 0) {
date_fmt = "%Y.%m.%d-%H:%M:%S";
}
/* Print OUTPUT (after ALL that!) */
t_buff = xmalloc(201);
strftime(t_buff, 200, date_fmt, &tm_time);
printf("%s\n", t_buff);
return EXIT_SUCCESS;
}
|
