source: branches/2.2.2/mindi-busybox/coreutils/tee.c @ 1247

Last change on this file since 1247 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 3.2 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 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23/* BB_AUDIT SUSv3 compliant */
24/* http://www.opengroup.org/onlinepubs/007904975/utilities/tee.html */
25
26#include <stdio.h>
27#include <stdlib.h>
28#include <signal.h>
29#include <unistd.h>
30#include "busybox.h"
31
32int tee_main(int argc, char **argv)
33{
34    const char *mode = "w\0a";
35    FILE **files;
36    FILE **p;
37    char **filenames;
38    int flags;
39    int retval = EXIT_SUCCESS;
40#ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
41    ssize_t c;
42# define buf bb_common_bufsiz1
43#else
44    int c;
45#endif
46
47    flags = bb_getopt_ulflags(argc, argv, "ia");    /* 'a' must be 2nd */
48
49    mode += (flags & 2);    /* Since 'a' is the 2nd option... */
50
51    if (flags & 1) {
52        signal(SIGINT, SIG_IGN);    /* TODO - switch to sigaction.*/
53    }
54
55    /* gnu tee ignores SIGPIPE in case one of the output files is a pipe
56     * that doesn't consume all its input.  Good idea... */
57    signal(SIGPIPE, SIG_IGN);       /* TODO - switch to sigaction.*/
58
59    /* Allocate an array of FILE *'s, with one extra for a sentinal. */
60    p = files = (FILE **)xmalloc(sizeof(FILE *) * (argc - optind + 2));
61    *p = stdout;
62    argv += optind - 1;
63    filenames = argv - 1;
64    *filenames = (char *) bb_msg_standard_input;    /* for later */
65    goto GOT_NEW_FILE;
66
67    do {
68        if ((*p = bb_wfopen(*argv, mode)) == NULL) {
69            retval = EXIT_FAILURE;
70            continue;
71        }
72        filenames[(int)(p - files)] = *argv;
73    GOT_NEW_FILE:
74        setbuf(*p, NULL);   /* tee must not buffer output. */
75        ++p;
76    } while (*++argv);
77
78    *p = NULL;              /* Store the sentinal value. */
79
80#ifdef CONFIG_FEATURE_TEE_USE_BLOCK_IO
81    while ((c = safe_read(STDIN_FILENO, buf, BUFSIZ)) > 0) {
82        for (p=files ; *p ; p++) {
83            fwrite(buf, 1, c, *p);
84        }
85    }
86
87    if (c < 0) {            /* Make sure read errors are signaled. */
88        retval = EXIT_FAILURE;
89    }
90
91#else
92    setvbuf(stdout, NULL, _IONBF, 0);
93    while ((c = getchar()) != EOF) {
94        for (p=files ; *p ; p++) {
95            putc(c, *p);
96        }
97    }
98#endif
99
100    /* Now we need to check for i/o errors on stdin and the various
101     * output files.  Since we know that the first entry in the output
102     * file table is stdout, we can save one "if ferror" test by
103     * setting the first entry to stdin and checking stdout error
104     * status with bb_fflush_stdout_and_exit()... although fflush()ing
105     * is unnecessary here. */
106
107    p = files;
108    *p = stdin;
109    do {        /* Now check for (input and) output errors. */
110        /* Checking ferror should be sufficient, but we may want to fclose.
111         * If we do, remember not to close stdin! */
112        bb_xferror(*p, filenames[(int)(p - files)]);
113    } while (*++p);
114
115    bb_fflush_stdout_and_exit(retval);
116}
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