Contents of /trunk/mkinitrd-magellan/busybox/coreutils/tee.c
Parent Directory | Revision Log
Revision 532 -
(show annotations)
(download)
Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 2564 byte(s)
Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 2564 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
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 "busybox.h" |
14 | #include <signal.h> |
15 | |
16 | int tee_main(int argc, char **argv) |
17 | { |
18 | const char *mode = "w\0a"; |
19 | FILE **files; |
20 | FILE **fp; |
21 | char **names; |
22 | char **np; |
23 | int flags; |
24 | int retval = EXIT_SUCCESS; |
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 | flags = getopt32(argc, argv, "ia"); /* 'a' must be 2nd */ |
32 | argc -= optind; |
33 | argv += optind; |
34 | |
35 | mode += (flags & 2); /* Since 'a' is the 2nd option... */ |
36 | |
37 | if (flags & 1) { |
38 | signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. */ |
39 | } |
40 | /* gnu tee ignores SIGPIPE in case one of the output files is a pipe |
41 | * that doesn't consume all its input. Good idea... */ |
42 | signal(SIGPIPE, SIG_IGN); /* TODO - switch to sigaction. */ |
43 | |
44 | /* Allocate an array of FILE *'s, with one extra for a sentinal. */ |
45 | fp = files = xzalloc(sizeof(FILE *) * (argc + 2)); |
46 | np = names = argv - 1; |
47 | |
48 | files[0] = stdout; |
49 | goto GOT_NEW_FILE; |
50 | do { |
51 | *fp = fopen_or_warn(*argv, mode); |
52 | if (*fp == NULL) { |
53 | retval = EXIT_FAILURE; |
54 | continue; |
55 | } |
56 | *np = *argv++; |
57 | GOT_NEW_FILE: |
58 | setbuf(*fp++, NULL); /* tee must not buffer output. */ |
59 | np++; |
60 | } while (*argv); |
61 | /* names[0] will be filled later */ |
62 | |
63 | #if ENABLE_FEATURE_TEE_USE_BLOCK_IO |
64 | while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) { |
65 | fp = files; |
66 | do |
67 | fwrite(buf, 1, c, *fp++); |
68 | while (*fp); |
69 | } |
70 | if (c < 0) { /* Make sure read errors are signaled. */ |
71 | retval = EXIT_FAILURE; |
72 | } |
73 | #else |
74 | setvbuf(stdout, NULL, _IONBF, 0); |
75 | while ((c = getchar()) != EOF) { |
76 | fp = files; |
77 | do |
78 | putc(c, *fp++); |
79 | while (*fp); |
80 | } |
81 | #endif |
82 | |
83 | /* Now we need to check for i/o errors on stdin and the various |
84 | * output files. Since we know that the first entry in the output |
85 | * file table is stdout, we can save one "if ferror" test by |
86 | * setting the first entry to stdin and checking stdout error |
87 | * status with fflush_stdout_and_exit()... although fflush()ing |
88 | * is unnecessary here. */ |
89 | np = names; |
90 | fp = files; |
91 | names[0] = (char *) bb_msg_standard_input; |
92 | files[0] = stdin; |
93 | do { /* Now check for input and output errors. */ |
94 | /* Checking ferror should be sufficient, but we may want to fclose. |
95 | * If we do, remember not to close stdin! */ |
96 | die_if_ferror(*fp++, *np++); |
97 | } while (*fp); |
98 | |
99 | fflush_stdout_and_exit(retval); |
100 | } |