source: branches/3.2/mindi-busybox/coreutils/tee.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 3.0 KB
Line 
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 source tree.
8 */
9
10/* BB_AUDIT SUSv3 compliant */
11/* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
12
13//usage:#define tee_trivial_usage
14//usage:       "[-ai] [FILE]..."
15//usage:#define tee_full_usage "\n\n"
16//usage:       "Copy stdin to each FILE, and also to stdout\n"
17//usage:     "\n    -a  Append to the given FILEs, don't overwrite"
18//usage:     "\n    -i  Ignore interrupt signals (SIGINT)"
19//usage:
20//usage:#define tee_example_usage
21//usage:       "$ echo \"Hello\" | tee /tmp/foo\n"
22//usage:       "$ cat /tmp/foo\n"
23//usage:       "Hello\n"
24
25#include "libbb.h"
26
27int tee_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
28int tee_main(int argc, char **argv)
29{
30    const char *mode = "w\0a";
31    FILE **files;
32    FILE **fp;
33    char **names;
34    char **np;
35    char retval;
36//TODO: make unconditional
37#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
38    ssize_t c;
39# define buf bb_common_bufsiz1
40#else
41    int c;
42#endif
43    retval = getopt32(argv, "ia");  /* 'a' must be 2nd */
44    argc -= optind;
45    argv += optind;
46
47    mode += (retval & 2);   /* Since 'a' is the 2nd option... */
48
49    if (retval & 1) {
50        signal(SIGINT, SIG_IGN); /* TODO - switch to sigaction. (why?) */
51    }
52    retval = EXIT_SUCCESS;
53    /* gnu tee ignores SIGPIPE in case one of the output files is a pipe
54     * that doesn't consume all its input.  Good idea... */
55    signal(SIGPIPE, SIG_IGN);
56
57    /* Allocate an array of FILE *'s, with one extra for a sentinel. */
58    fp = files = xzalloc(sizeof(FILE *) * (argc + 2));
59    np = names = argv - 1;
60
61    files[0] = stdout;
62    goto GOT_NEW_FILE;
63    do {
64        *fp = stdout;
65        if (NOT_LONE_DASH(*argv)) {
66            *fp = fopen_or_warn(*argv, mode);
67            if (*fp == NULL) {
68                retval = EXIT_FAILURE;
69                argv++;
70                continue;
71            }
72        }
73        *np = *argv++;
74 GOT_NEW_FILE:
75        setbuf(*fp, NULL);  /* tee must not buffer output. */
76        fp++;
77        np++;
78    } while (*argv);
79    /* names[0] will be filled later */
80
81#if ENABLE_FEATURE_TEE_USE_BLOCK_IO
82    while ((c = safe_read(STDIN_FILENO, buf, sizeof(buf))) > 0) {
83        fp = files;
84        do
85            fwrite(buf, 1, c, *fp);
86        while (*++fp);
87    }
88    if (c < 0) {        /* Make sure read errors are signaled. */
89        retval = EXIT_FAILURE;
90    }
91#else
92    setvbuf(stdout, NULL, _IONBF, 0);
93    while ((c = getchar()) != EOF) {
94        fp = files;
95        do
96            putc(c, *fp);
97        while (*++fp);
98    }
99#endif
100
101    /* Now we need to check for i/o errors on stdin and the various
102     * output files.  Since we know that the first entry in the output
103     * file table is stdout, we can save one "if ferror" test by
104     * setting the first entry to stdin and checking stdout error
105     * status with fflush_stdout_and_exit()... although fflush()ing
106     * is unnecessary here. */
107    np = names;
108    fp = files;
109    names[0] = (char *) bb_msg_standard_input;
110    files[0] = stdin;
111    do {    /* Now check for input and output errors. */
112        /* Checking ferror should be sufficient, but we may want to fclose.
113         * If we do, remember not to close stdin! */
114        die_if_ferror(*fp++, *np++);
115    } while (*fp);
116
117    fflush_stdout_and_exit(retval);
118}
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