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76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* cat implementation for busybox
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*
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* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//config:config CAT
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//config: bool "cat"
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//config: default y
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//config: help
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//config: cat is used to concatenate files and print them to the standard
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//config: output. Enable this option if you wish to enable the 'cat' utility.
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//applet:IF_CAT(APPLET_NOFORK(cat, cat, BB_DIR_BIN, BB_SUID_DROP, cat))
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//kbuild:lib-$(CONFIG_CAT) += cat.o
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/* BB_AUDIT SUSv3 compliant */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/cat.html */
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//usage:#define cat_trivial_usage
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//usage: "[-n] [FILE]..."
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//usage:#define cat_full_usage "\n\n"
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//usage: "Concatenate FILEs and print them to stdout"
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//usage: "\n -n Number output lines"
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/*
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Longopts not implemented yet:
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--number-nonblank number nonempty output lines, overrides -n
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--number number all output lines
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Not implemented yet:
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-A, --show-all equivalent to -vET
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-e equivalent to -vE
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-E, --show-ends display $ at end of each line
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-s, --squeeze-blank suppress repeated empty output lines
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-t equivalent to -vT
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-T, --show-tabs display TAB characters as ^I
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-v, --show-nonprinting use ^ and M- notation, except for LFD and TAB
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*/
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//usage:
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//usage:#define cat_example_usage
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//usage: "$ cat /proc/uptime\n"
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//usage: "110716.72 17.67"
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#include "libbb.h"
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/* This is a NOFORK applet. Be very careful! */
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int cat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int cat_main(int argc UNUSED_PARAM, char **argv)
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{
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struct number_state ns;
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unsigned opt;
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/* -u is ignored */
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opt = getopt32(argv, "nbu");
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argv += optind;
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if (!(opt & 3)) /* no -n or -b */
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return bb_cat(argv);
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if (!*argv)
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*--argv = (char*)"-";
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ns.width = 6;
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ns.start = 1;
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ns.inc = 1;
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ns.sep = "\t";
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ns.empty_str = "\n";
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ns.all = !(opt & 2); /* -n without -b */
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ns.nonempty = (opt & 2); /* -b (with or without -n) */
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do {
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print_numbered_lines(&ns, *argv);
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} while (*++argv);
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fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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