source: branches/3.2/mindi-busybox/coreutils/cat.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: 1.6 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * cat implementation for busybox
4 *
5 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
6 *
7 * Licensed under GPLv2, see file LICENSE in this source tree.
8 */
9
10/* BB_AUDIT SUSv3 compliant */
11/* http://www.opengroup.org/onlinepubs/007904975/utilities/cat.html */
12
13//kbuild:lib-$(CONFIG_CAT)     += cat.o
14//kbuild:lib-$(CONFIG_MORE)    += cat.o # more uses it if stdout isn't a tty
15//kbuild:lib-$(CONFIG_LESS)    += cat.o # less too
16//kbuild:lib-$(CONFIG_CRONTAB) += cat.o # crontab -l
17
18//config:config CAT
19//config:   bool "cat"
20//config:   default y
21//config:   help
22//config:     cat is used to concatenate files and print them to the standard
23//config:     output. Enable this option if you wish to enable the 'cat' utility.
24
25//usage:#define cat_trivial_usage
26//usage:       "[FILE]..."
27//usage:#define cat_full_usage "\n\n"
28//usage:       "Concatenate FILEs and print them to stdout"
29//usage:
30//usage:#define cat_example_usage
31//usage:       "$ cat /proc/uptime\n"
32//usage:       "110716.72 17.67"
33
34#include "libbb.h"
35
36/* This is a NOFORK applet. Be very careful! */
37
38
39int bb_cat(char **argv)
40{
41    int fd;
42    int retval = EXIT_SUCCESS;
43
44    if (!*argv)
45        argv = (char**) &bb_argv_dash;
46
47    do {
48        fd = open_or_warn_stdin(*argv);
49        if (fd >= 0) {
50            /* This is not a xfunc - never exits */
51            off_t r = bb_copyfd_eof(fd, STDOUT_FILENO);
52            if (fd != STDIN_FILENO)
53                close(fd);
54            if (r >= 0)
55                continue;
56        }
57        retval = EXIT_FAILURE;
58    } while (*++argv);
59
60    return retval;
61}
62
63int cat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
64int cat_main(int argc UNUSED_PARAM, char **argv)
65{
66    getopt32(argv, "u");
67    argv += optind;
68    return bb_cat(argv);
69}
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