Contents of /tags/mkinitrd-6_1_3/busybox/coreutils/tee.c
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Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
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File size: 2696 byte(s)
Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 2696 byte(s)
tagged 'mkinitrd-6_1_3'
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) MAIN_EXTERNALLY_VISIBLE; |
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 | //TODO: make unconditional |
26 | #if ENABLE_FEATURE_TEE_USE_BLOCK_IO |
27 | ssize_t c; |
28 | # define buf bb_common_bufsiz1 |
29 | #else |
30 | int c; |
31 | #endif |
32 | retval = getopt32(argv, "ia"); /* 'a' must be 2nd */ |
33 | argc -= optind; |
34 | argv += optind; |
35 | |
36 | mode += (retval & 2); /* Since 'a' is the 2nd option... */ |
37 | |
38 | if (retval & 1) { |
39 | signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. (why?) */ |
40 | } |
41 | retval = EXIT_SUCCESS; |
42 | /* gnu tee ignores SIGPIPE in case one of the output files is a pipe |
43 | * that doesn't consume all its input. Good idea... */ |
44 | signal(SIGPIPE, SIG_IGN); |
45 | |
46 | /* Allocate an array of FILE *'s, with one extra for a sentinal. */ |
47 | fp = files = xzalloc(sizeof(FILE *) * (argc + 2)); |
48 | np = names = argv - 1; |
49 | |
50 | files[0] = stdout; |
51 | goto GOT_NEW_FILE; |
52 | do { |
53 | *fp = stdout; |
54 | if (NOT_LONE_DASH(*argv)) { |
55 | *fp = fopen_or_warn(*argv, mode); |
56 | if (*fp == NULL) { |
57 | retval = EXIT_FAILURE; |
58 | argv++; |
59 | continue; |
60 | } |
61 | } |
62 | *np = *argv++; |
63 | GOT_NEW_FILE: |
64 | setbuf(*fp, NULL); /* tee must not buffer output. */ |
65 | fp++; |
66 | np++; |
67 | } while (*argv); |
68 | /* names[0] will be filled later */ |
69 | |
70 | #if ENABLE_FEATURE_TEE_USE_BLOCK_IO |
71 | while ((c = safe_read(STDIN_FILENO, buf, sizeof(buf))) > 0) { |
72 | fp = files; |
73 | do |
74 | fwrite(buf, 1, c, *fp++); |
75 | while (*fp); |
76 | } |
77 | if (c < 0) { /* Make sure read errors are signaled. */ |
78 | retval = EXIT_FAILURE; |
79 | } |
80 | #else |
81 | setvbuf(stdout, NULL, _IONBF, 0); |
82 | while ((c = getchar()) != EOF) { |
83 | fp = files; |
84 | do |
85 | putc(c, *fp++); |
86 | while (*fp); |
87 | } |
88 | #endif |
89 | |
90 | /* Now we need to check for i/o errors on stdin and the various |
91 | * output files. Since we know that the first entry in the output |
92 | * file table is stdout, we can save one "if ferror" test by |
93 | * setting the first entry to stdin and checking stdout error |
94 | * status with fflush_stdout_and_exit()... although fflush()ing |
95 | * is unnecessary here. */ |
96 | np = names; |
97 | fp = files; |
98 | names[0] = (char *) bb_msg_standard_input; |
99 | files[0] = stdin; |
100 | do { /* Now check for input and output errors. */ |
101 | /* Checking ferror should be sufficient, but we may want to fclose. |
102 | * If we do, remember not to close stdin! */ |
103 | die_if_ferror(*fp++, *np++); |
104 | } while (*fp); |
105 | |
106 | fflush_stdout_and_exit(retval); |
107 | } |