1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * tee implementation for busybox
|
---|
4 | *
|
---|
5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
|
---|
6 | *
|
---|
7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
---|
8 | */
|
---|
9 |
|
---|
10 | /* BB_AUDIT SUSv3 compliant */
|
---|
11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
|
---|
12 |
|
---|
13 | #include "libbb.h"
|
---|
14 | #include <signal.h>
|
---|
15 |
|
---|
16 | int tee_main(int argc, char **argv);
|
---|
17 | int tee_main(int argc, char **argv)
|
---|
18 | {
|
---|
19 | const char *mode = "w\0a";
|
---|
20 | FILE **files;
|
---|
21 | FILE **fp;
|
---|
22 | char **names;
|
---|
23 | char **np;
|
---|
24 | char retval;
|
---|
25 | #if ENABLE_FEATURE_TEE_USE_BLOCK_IO
|
---|
26 | ssize_t c;
|
---|
27 | # define buf bb_common_bufsiz1
|
---|
28 | #else
|
---|
29 | int c;
|
---|
30 | #endif
|
---|
31 | retval = getopt32(argv, "ia"); /* 'a' must be 2nd */
|
---|
32 | argc -= optind;
|
---|
33 | argv += optind;
|
---|
34 |
|
---|
35 | mode += (retval & 2); /* Since 'a' is the 2nd option... */
|
---|
36 |
|
---|
37 | if (retval & 1) {
|
---|
38 | signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. */
|
---|
39 | }
|
---|
40 | retval = EXIT_SUCCESS;
|
---|
41 | /* gnu tee ignores SIGPIPE in case one of the output files is a pipe
|
---|
42 | * that doesn't consume all its input. Good idea... */
|
---|
43 | signal(SIGPIPE, SIG_IGN); /* TODO - switch to sigaction. */
|
---|
44 |
|
---|
45 | /* Allocate an array of FILE *'s, with one extra for a sentinal. */
|
---|
46 | fp = files = xzalloc(sizeof(FILE *) * (argc + 2));
|
---|
47 | np = names = argv - 1;
|
---|
48 |
|
---|
49 | files[0] = stdout;
|
---|
50 | goto GOT_NEW_FILE;
|
---|
51 | do {
|
---|
52 | *fp = fopen_or_warn(*argv, mode);
|
---|
53 | if (*fp == NULL) {
|
---|
54 | retval = EXIT_FAILURE;
|
---|
55 | continue;
|
---|
56 | }
|
---|
57 | *np = *argv++;
|
---|
58 | GOT_NEW_FILE:
|
---|
59 | setbuf(*fp++, NULL); /* tee must not buffer output. */
|
---|
60 | np++;
|
---|
61 | } while (*argv);
|
---|
62 | /* names[0] will be filled later */
|
---|
63 |
|
---|
64 | #if ENABLE_FEATURE_TEE_USE_BLOCK_IO
|
---|
65 | while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) {
|
---|
66 | fp = files;
|
---|
67 | do
|
---|
68 | fwrite(buf, 1, c, *fp++);
|
---|
69 | while (*fp);
|
---|
70 | }
|
---|
71 | if (c < 0) { /* Make sure read errors are signaled. */
|
---|
72 | retval = EXIT_FAILURE;
|
---|
73 | }
|
---|
74 | #else
|
---|
75 | setvbuf(stdout, NULL, _IONBF, 0);
|
---|
76 | while ((c = getchar()) != EOF) {
|
---|
77 | fp = files;
|
---|
78 | do
|
---|
79 | putc(c, *fp++);
|
---|
80 | while (*fp);
|
---|
81 | }
|
---|
82 | #endif
|
---|
83 |
|
---|
84 | /* Now we need to check for i/o errors on stdin and the various
|
---|
85 | * output files. Since we know that the first entry in the output
|
---|
86 | * file table is stdout, we can save one "if ferror" test by
|
---|
87 | * setting the first entry to stdin and checking stdout error
|
---|
88 | * status with fflush_stdout_and_exit()... although fflush()ing
|
---|
89 | * is unnecessary here. */
|
---|
90 | np = names;
|
---|
91 | fp = files;
|
---|
92 | names[0] = (char *) bb_msg_standard_input;
|
---|
93 | files[0] = stdin;
|
---|
94 | do { /* Now check for input and output errors. */
|
---|
95 | /* Checking ferror should be sufficient, but we may want to fclose.
|
---|
96 | * If we do, remember not to close stdin! */
|
---|
97 | die_if_ferror(*fp++, *np++);
|
---|
98 | } while (*fp);
|
---|
99 |
|
---|
100 | fflush_stdout_and_exit(retval);
|
---|
101 | }
|
---|