211 lines
6.0 KiB
C
211 lines
6.0 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 (5.6 kb)"
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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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//config:
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//config:config FEATURE_CATN
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//config: bool "Enable -n and -b options"
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//config: default y
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//config: depends on CAT
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//config: help
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//config: -n numbers all output lines while -b numbers nonempty output lines.
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//config:
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//config:config FEATURE_CATV
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//config: bool "cat -v[etA]"
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//config: default y
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//config: depends on CAT
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//config: help
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//config: Display nonprinting characters as escape sequences
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//applet:IF_CAT(APPLET(cat, BB_DIR_BIN, BB_SUID_DROP))
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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:#if ENABLE_FEATURE_CATN || ENABLE_FEATURE_CATV
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//usage:#define cat_trivial_usage
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//usage: "[-" IF_FEATURE_CATN("nb") IF_FEATURE_CATV("vteA") "] [FILE]..."
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//usage:#else
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//usage:#define cat_trivial_usage
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//usage: "[FILE]..."
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//usage:#endif
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//usage:#define cat_full_usage "\n\n"
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//usage: "Print FILEs to stdout\n"
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//usage: IF_FEATURE_CATN(
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//usage: "\n -n Number output lines"
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//usage: "\n -b Number nonempty lines"
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//usage: )
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//usage: IF_FEATURE_CATV(
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//usage: "\n -v Show nonprinting characters as ^x or M-x"
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//usage: "\n -t ...and tabs as ^I"
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//usage: "\n -e ...and end lines with $"
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//usage: "\n -A Same as -vte"
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//usage: )
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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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--show-nonprinting use ^ and M- notation, except for LFD and TAB
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--show-all equivalent to -vet
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Not implemented yet:
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-E, --show-ends display $ at end of each line (-e sans -v)
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-T, --show-tabs display TAB characters as ^I (-t sans -v)
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-s, --squeeze-blank suppress repeated empty output lines
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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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#include "common_bufsiz.h"
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#if ENABLE_FEATURE_CATV
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/*
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* cat -v implementation for busybox
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*
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* Copyright (C) 2006 Rob Landley <rob@landley.net>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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/* Rob had "cat -v" implemented as a separate applet, catv.
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* See "cat -v considered harmful" at
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* http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz
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* From USENIX Summer Conference Proceedings, 1983
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* """
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* The talk reviews reasons for UNIX's popularity and shows, using UCB cat
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* as a primary example, how UNIX has grown fat. cat isn't for printing
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* files with line numbers, it isn't for compressing multiple blank lines,
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* it's not for looking at non-printing ASCII characters, it's for
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* concatenating files.
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* We are reminded that ls isn't the place for code to break a single column
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* into multiple ones, and that mailnews shouldn't have its own more
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* processing or joke encryption code.
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* """
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*
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* I agree with the argument. Unfortunately, this ship has sailed (1983...).
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* There are dozens of Linux distros and each of them has "cat" which supports -v.
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* It's unrealistic for us to "reeducate" them to use our, incompatible way
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* to achieve "cat -v" effect. The actual effect would be "users pissed off
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* by gratuitous incompatibility".
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*/
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#define CAT_OPT_e (1<<0)
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#define CAT_OPT_t (1<<1)
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#define CAT_OPT_v (1<<2)
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/* -A occupies bit (1<<3) */
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#define CAT_OPT_n ((1<<4) * ENABLE_FEATURE_CATN)
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#define CAT_OPT_b ((1<<5) * ENABLE_FEATURE_CATN)
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static int catv(unsigned opts, char **argv)
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{
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int retval = EXIT_SUCCESS;
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int fd;
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#if ENABLE_FEATURE_CATN
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unsigned lineno = 0;
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unsigned eol_char = (opts & (CAT_OPT_n|CAT_OPT_b)) ? '\n' : 0x100;
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unsigned skip_num_on = (opts & CAT_OPT_b) ? '\n' : 0x100;
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bool eol_seen = 1;
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#endif
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BUILD_BUG_ON(CAT_OPT_e != VISIBLE_ENDLINE);
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BUILD_BUG_ON(CAT_OPT_t != VISIBLE_SHOW_TABS);
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#if 0 /* These consts match, we can just pass "opts" to visible() */
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if (opts & CAT_OPT_e)
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flags |= VISIBLE_ENDLINE;
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if (opts & CAT_OPT_t)
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flags |= VISIBLE_SHOW_TABS;
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#endif
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#define read_buf bb_common_bufsiz1
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setup_common_bufsiz();
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do {
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fd = open_or_warn_stdin(*argv);
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if (fd < 0) {
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retval = EXIT_FAILURE;
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continue;
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}
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for (;;) {
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int i, res;
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res = read(fd, read_buf, COMMON_BUFSIZE);
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if (res < 0)
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retval = EXIT_FAILURE;
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if (res <= 0)
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break;
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for (i = 0; i < res; i++) {
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unsigned char c = read_buf[i];
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char buf[sizeof("M-^c")];
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#if ENABLE_FEATURE_CATN
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if (eol_seen && c != skip_num_on)
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printf("%6u ", ++lineno);
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eol_seen = (c == eol_char);
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#endif
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visible(c, buf, opts);
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fputs(buf, stdout);
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}
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}
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if (ENABLE_FEATURE_CLEAN_UP && fd)
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close(fd);
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} while (*++argv);
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fflush_stdout_and_exit(retval);
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}
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#undef CAT_OPT_n
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#undef CAT_OPT_b
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#endif
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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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unsigned opts;
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IF_FEATURE_CATV(opt_complementary = "Aetv"; /* -A == -vet */)
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/* -u is ignored ("unbuffered") */
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opts = getopt32(argv, IF_FEATURE_CATV("etvA") IF_FEATURE_CATN("nb") "u");
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argv += optind;
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/* Read from stdin if there's nothing else to do. */
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if (!argv[0])
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*--argv = (char*)"-";
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#if ENABLE_FEATURE_CATV
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if (opts & 7)
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return catv(opts, argv);
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opts >>= 4;
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#endif
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#if ENABLE_FEATURE_CATN
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# define CAT_OPT_n (1<<0)
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# define CAT_OPT_b (1<<1)
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if (opts & (CAT_OPT_n|CAT_OPT_b)) { /* -n or -b */
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struct number_state ns;
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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 = !(opts & CAT_OPT_b); /* -n without -b */
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ns.nonempty = (opts & CAT_OPT_b); /* -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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/*opts >>= 2;*/
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#endif
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return bb_cat(argv);
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}
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