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
|
/* vi: set sw=4 ts=4: */
/*
* tee implementation for busybox
*
* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config TEE
//config: bool "tee (4.2 kb)"
//config: default y
//config: help
//config: tee is used to read from standard input and write
//config: to standard output and files.
//config:
//config:config FEATURE_TEE_USE_BLOCK_IO
//config: bool "Enable block I/O (larger/faster) instead of byte I/O"
//config: default y
//config: depends on TEE
//config: help
//config: Enable this option for a faster tee, at expense of size.
//applet:IF_TEE(APPLET(tee, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_TEE) += tee.o
/* BB_AUDIT SUSv3 compliant */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
//usage:#define tee_trivial_usage
//usage: "[-ai] [FILE]..."
//usage:#define tee_full_usage "\n\n"
//usage: "Copy stdin to each FILE, and also to stdout\n"
//usage: "\n -a Append to the given FILEs, don't overwrite"
//usage: "\n -i Ignore interrupt signals (SIGINT)"
//usage:
//usage:#define tee_example_usage
//usage: "$ echo \"Hello\" | tee /tmp/foo\n"
//usage: "$ cat /tmp/foo\n"
//usage: "Hello\n"
#include "libbb.h"
#include "common_bufsiz.h"
int tee_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int tee_main(int argc, char **argv)
{
const char *mode = "w\0a";
FILE **files;
FILE **fp;
char **names;
char **np;
char retval;
//TODO: make unconditional
#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
ssize_t c;
# define buf bb_common_bufsiz1
setup_common_bufsiz();
#else
int c;
#endif
retval = getopt32(argv, "ia"); /* 'a' must be 2nd */
argc -= optind;
argv += optind;
mode += (retval & 2); /* Since 'a' is the 2nd option... */
if (retval & 1) {
signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. (why?) */
}
retval = EXIT_SUCCESS;
/* gnu tee ignores SIGPIPE in case one of the output files is a pipe
* that doesn't consume all its input. Good idea... */
signal(SIGPIPE, SIG_IGN);
/* Allocate an array of FILE *'s, with one extra for a sentinel. */
fp = files = xzalloc(sizeof(FILE *) * (argc + 2));
np = names = argv - 1;
files[0] = stdout;
goto GOT_NEW_FILE;
do {
*fp = stdout;
if (NOT_LONE_DASH(*argv)) {
*fp = fopen_or_warn(*argv, mode);
if (*fp == NULL) {
retval = EXIT_FAILURE;
argv++;
continue;
}
}
*np = *argv++;
GOT_NEW_FILE:
setbuf(*fp, NULL); /* tee must not buffer output. */
fp++;
np++;
} while (*argv);
/* names[0] will be filled later */
#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
while ((c = safe_read(STDIN_FILENO, buf, COMMON_BUFSIZE)) > 0) {
fp = files;
do
fwrite(buf, 1, c, *fp);
while (*++fp);
}
if (c < 0) { /* Make sure read errors are signaled. */
retval = EXIT_FAILURE;
}
#else
setvbuf(stdout, NULL, _IONBF, 0);
while ((c = getchar()) != EOF) {
fp = files;
do
putc(c, *fp);
while (*++fp);
}
#endif
/* Now we need to check for i/o errors on stdin and the various
* output files. Since we know that the first entry in the output
* file table is stdout, we can save one "if ferror" test by
* setting the first entry to stdin and checking stdout error
* status with fflush_stdout_and_exit()... although fflush()ing
* is unnecessary here. */
np = names;
fp = files;
names[0] = (char *) bb_msg_standard_input;
files[0] = stdin;
do { /* Now check for input and output errors. */
/* Checking ferror should be sufficient, but we may want to fclose.
* If we do, remember not to close stdin! */
die_if_ferror(*fp++, *np++);
} while (*fp);
fflush_stdout_and_exit(retval);
}
|
