busybox/coreutils/cat.c
Denys Vlasenko af3f420116 Convert all coreutils/* applets to "new style" applet definitions
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-11-23 14:46:56 +01:00

68 lines
1.5 KiB
C

/* vi: set sw=4 ts=4: */
/*
* cat implementation for busybox
*
* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config CAT
//config: bool "cat"
//config: default y
//config: help
//config: cat is used to concatenate files and print them to the standard
//config: output. Enable this option if you wish to enable the 'cat' utility.
//applet:IF_CAT(APPLET_NOFORK(cat, cat, BB_DIR_BIN, BB_SUID_DROP, cat))
//kbuild:lib-$(CONFIG_CAT) += cat.o
/* BB_AUDIT SUSv3 compliant */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/cat.html */
//usage:#define cat_trivial_usage
//usage: "[FILE]..."
//usage:#define cat_full_usage "\n\n"
//usage: "Concatenate FILEs and print them to stdout"
//usage:
//usage:#define cat_example_usage
//usage: "$ cat /proc/uptime\n"
//usage: "110716.72 17.67"
#include "libbb.h"
/* This is a NOFORK applet. Be very careful! */
int bb_cat(char **argv)
{
int fd;
int retval = EXIT_SUCCESS;
if (!*argv)
argv = (char**) &bb_argv_dash;
do {
fd = open_or_warn_stdin(*argv);
if (fd >= 0) {
/* This is not a xfunc - never exits */
off_t r = bb_copyfd_eof(fd, STDOUT_FILENO);
if (fd != STDIN_FILENO)
close(fd);
if (r >= 0)
continue;
}
retval = EXIT_FAILURE;
} while (*++argv);
return retval;
}
int cat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int cat_main(int argc UNUSED_PARAM, char **argv)
{
getopt32(argv, "u");
argv += optind;
return bb_cat(argv);
}