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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 (5.6 kb)"
//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.
//config:
//config:config FEATURE_CATN
//config: bool "Enable -n and -b options"
//config: default y
//config: depends on CAT
//config: help
//config: -n numbers all output lines while -b numbers nonempty output lines.
//config:
//config:config FEATURE_CATV
//config: bool "cat -v[etA]"
//config: default y
//config: depends on CAT
//config: help
//config: Display nonprinting characters as escape sequences
//applet:IF_CAT(APPLET(cat, BB_DIR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_CAT) += cat.o
/* BB_AUDIT SUSv3 compliant */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/cat.html */
//usage:#if ENABLE_FEATURE_CATN || ENABLE_FEATURE_CATV
//usage:#define cat_trivial_usage
//usage: "[-" IF_FEATURE_CATN("nb") IF_FEATURE_CATV("vteA") "] [FILE]..."
//usage:#else
//usage:#define cat_trivial_usage
//usage: "[FILE]..."
//usage:#endif
//usage:#define cat_full_usage "\n\n"
//usage: "Print FILEs to stdout\n"
//usage: IF_FEATURE_CATN(
//usage: "\n -n Number output lines"
//usage: "\n -b Number nonempty lines"
//usage: )
//usage: IF_FEATURE_CATV(
//usage: "\n -v Show nonprinting characters as ^x or M-x"
//usage: "\n -t ...and tabs as ^I"
//usage: "\n -e ...and end lines with $"
//usage: "\n -A Same as -vte"
//usage: )
/*
Longopts not implemented yet:
--number-nonblank number nonempty output lines, overrides -n
--number number all output lines
--show-nonprinting use ^ and M- notation, except for LFD and TAB
--show-all equivalent to -vet
Not implemented yet:
-E, --show-ends display $ at end of each line (-e sans -v)
-T, --show-tabs display TAB characters as ^I (-t sans -v)
-s, --squeeze-blank suppress repeated empty output lines
*/
//usage:
//usage:#define cat_example_usage
//usage: "$ cat /proc/uptime\n"
//usage: "110716.72 17.67"
#include "libbb.h"
#include "common_bufsiz.h"
#if ENABLE_FEATURE_CATV
/*
* cat -v implementation for busybox
*
* Copyright (C) 2006 Rob Landley <rob@landley.net>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/* Rob had "cat -v" implemented as a separate applet, catv.
* See "cat -v considered harmful" at
* http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz
* From USENIX Summer Conference Proceedings, 1983
* """
* The talk reviews reasons for UNIX's popularity and shows, using UCB cat
* as a primary example, how UNIX has grown fat. cat isn't for printing
* files with line numbers, it isn't for compressing multiple blank lines,
* it's not for looking at non-printing ASCII characters, it's for
* concatenating files.
* We are reminded that ls isn't the place for code to break a single column
* into multiple ones, and that mailnews shouldn't have its own more
* processing or joke encryption code.
* """
*
* I agree with the argument. Unfortunately, this ship has sailed (1983...).
* There are dozens of Linux distros and each of them has "cat" which supports -v.
* It's unrealistic for us to "reeducate" them to use our, incompatible way
* to achieve "cat -v" effect. The actual effect would be "users pissed off
* by gratuitous incompatibility".
*/
#define CAT_OPT_e (1<<0)
#define CAT_OPT_t (1<<1)
#define CAT_OPT_v (1<<2)
/* -A occupies bit (1<<3) */
#define CAT_OPT_n ((1<<4) * ENABLE_FEATURE_CATN)
#define CAT_OPT_b ((1<<5) * ENABLE_FEATURE_CATN)
static int catv(unsigned opts, char **argv)
{
int retval = EXIT_SUCCESS;
int fd;
#if ENABLE_FEATURE_CATN
unsigned lineno = 0;
unsigned eol_char = (opts & (CAT_OPT_n|CAT_OPT_b)) ? '\n' : 0x100;
unsigned skip_num_on = (opts & CAT_OPT_b) ? '\n' : 0x100;
bool eol_seen = 1;
#endif
BUILD_BUG_ON(CAT_OPT_e != VISIBLE_ENDLINE);
BUILD_BUG_ON(CAT_OPT_t != VISIBLE_SHOW_TABS);
#if 0 /* These consts match, we can just pass "opts" to visible() */
if (opts & CAT_OPT_e)
flags |= VISIBLE_ENDLINE;
if (opts & CAT_OPT_t)
flags |= VISIBLE_SHOW_TABS;
#endif
#define read_buf bb_common_bufsiz1
setup_common_bufsiz();
do {
fd = open_or_warn_stdin(*argv);
if (fd < 0) {
retval = EXIT_FAILURE;
continue;
}
for (;;) {
int i, res;
res = read(fd, read_buf, COMMON_BUFSIZE);
if (res < 0)
retval = EXIT_FAILURE;
if (res <= 0)
break;
for (i = 0; i < res; i++) {
unsigned char c = read_buf[i];
char buf[sizeof("M-^c")];
#if ENABLE_FEATURE_CATN
if (eol_seen && c != skip_num_on)
printf("%6u ", ++lineno);
eol_seen = (c == eol_char);
#endif
visible(c, buf, opts);
fputs(buf, stdout);
}
}
if (ENABLE_FEATURE_CLEAN_UP && fd)
close(fd);
} while (*++argv);
fflush_stdout_and_exit(retval);
}
#undef CAT_OPT_n
#undef CAT_OPT_b
#endif
int cat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int cat_main(int argc UNUSED_PARAM, char **argv)
{
unsigned opts;
opts = getopt32(argv, IF_FEATURE_CATV("^")
/* -u is ignored ("unbuffered") */
IF_FEATURE_CATV("etvA")IF_FEATURE_CATN("nb")"u"
IF_FEATURE_CATV("\0" "Aetv" /* -A == -vet */)
);
argv += optind;
/* Read from stdin if there's nothing else to do. */
if (!argv[0])
*--argv = (char*)"-";
#if ENABLE_FEATURE_CATV
if (opts & 7)
return catv(opts, argv);
opts >>= 4;
#endif
#if ENABLE_FEATURE_CATN
# define CAT_OPT_n (1<<0)
# define CAT_OPT_b (1<<1)
if (opts & (CAT_OPT_n|CAT_OPT_b)) { /* -n or -b */
struct number_state ns;
ns.width = 6;
ns.start = 1;
ns.inc = 1;
ns.sep = "\t";
ns.empty_str = "\n";
ns.all = !(opts & CAT_OPT_b); /* -n without -b */
ns.nonempty = (opts & CAT_OPT_b); /* -b (with or without -n) */
do {
print_numbered_lines(&ns, *argv);
} while (*++argv);
fflush_stdout_and_exit(EXIT_SUCCESS);
}
/*opts >>= 2;*/
#endif
return bb_cat(argv);
}
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