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/* 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-$(CONFIG_CAT) += cat.o
// For -n:
//kbuild:lib-$(CONFIG_CAT) += nl.o
/* BB_AUDIT SUSv3 compliant */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/cat.html */
//usage:#define cat_trivial_usage
//usage: "[-n] [FILE]..."
//usage:#define cat_full_usage "\n\n"
//usage: "Concatenate FILEs and print them to stdout"
//usage: "\n -n Number output lines"
/*
Longopts not implemented yet:
--number-nonblank number nonempty output lines, overrides -n
--number number all output lines
Not implemented yet:
-A, --show-all equivalent to -vET
-e equivalent to -vE
-E, --show-ends display $ at end of each line
-s, --squeeze-blank suppress repeated empty output lines
-t equivalent to -vT
-T, --show-tabs display TAB characters as ^I
-v, --show-nonprinting use ^ and M- notation, except for LFD and TAB
*/
//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)
{
struct number_state ns;
unsigned opt;
/* -u is ignored */
opt = getopt32(argv, "nbu");
argv += optind;
if (!(opt & 3)) /* no -n or -b */
return bb_cat(argv);
if (!*argv)
*--argv = (char*)"-";
ns.width = 6;
ns.start = 1;
ns.inc = 1;
ns.sep = "\t";
ns.empty_str = "\n";
ns.all = !(opt & 2); /* -n without -b */
ns.nonempty = (opt & 2); /* -b (with or without -n) */
do {
print_numbered_lines(&ns, *argv);
} while (*++argv);
fflush_stdout_and_exit(EXIT_SUCCESS);
}
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