catv: convert this bbox-specific applet into "cat -v"
function old new delta cat_main 150 320 +170 packed_usage 31511 31552 +41 applet_install_loc 190 189 -1 applet_main 1516 1512 -4 applet_names 2618 2613 -5 catv_main 227 - -227 ------------------------------------------------------------------------------ (add/remove: 0/2 grow/shrink: 2/3 up/down: 211/-237) Total: -26 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
140
coreutils/cat.c
140
coreutils/cat.c
@@ -12,8 +12,15 @@
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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_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_NOFORK(cat, cat, BB_DIR_BIN, BB_SUID_DROP, cat))
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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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@@ -21,22 +28,27 @@
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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: "[-nb"IF_FEATURE_CATV("vteA")"] [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: "Print FILEs to stdout\n"
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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: 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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--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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-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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-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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-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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@@ -44,19 +56,111 @@
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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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/* This is a NOFORK applet. Be very careful! */
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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 actuall effect would be "users pissed off
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* by gratuitous incompatibility".
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*/
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#define CATV_OPT_e (1<<0)
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#define CATV_OPT_t (1<<1)
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#define CATV_OPT_v (1<<2)
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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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BUILD_BUG_ON(CATV_OPT_e != VISIBLE_ENDLINE);
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BUILD_BUG_ON(CATV_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 & CATV_OPT_e)
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flags |= VISIBLE_ENDLINE;
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if (opts & CATV_OPT_t)
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flags |= VISIBLE_SHOW_TABS;
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#endif
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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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#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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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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#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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struct number_state ns;
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unsigned opt;
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unsigned opts;
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/* -u is ignored */
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opt = getopt32(argv, "nbu");
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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")"nbu");
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argv += optind;
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if (!(opt & 3)) /* no -n or -b */
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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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//BUG: -v,-e,-t,-A ignore -nb
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opts >>= 4;
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#endif
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#define CAT_OPT_n (1<<0)
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#define CAT_OPT_b (1<<1)
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#define CAT_OPT_u (1<<2)
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if (!(opts & (CAT_OPT_n|CAT_OPT_b))) /* no -n or -b */
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return bb_cat(argv);
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if (!*argv)
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@@ -66,8 +170,8 @@ int cat_main(int argc UNUSED_PARAM, char **argv)
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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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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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@@ -1,96 +0,0 @@
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/* vi: set sw=4 ts=4: */
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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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/* 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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//config:config CATV
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//config: bool "catv"
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//config: default y
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//config: help
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//config: Display nonprinting characters as escape sequences (like some
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//config: implementations' cat -v option).
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//applet:IF_CATV(APPLET(catv, BB_DIR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_CATV) += catv.o
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//usage:#define catv_trivial_usage
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//usage: "[-etv] [FILE]..."
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//usage:#define catv_full_usage "\n\n"
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//usage: "Display nonprinting characters as ^x or M-x\n"
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//usage: "\n -e End each line with $"
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//usage: "\n -t Show tabs as ^I"
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//usage: "\n -v Don't use ^x or M-x escapes"
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#include "libbb.h"
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#include "common_bufsiz.h"
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#define CATV_OPT_e (1<<0)
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#define CATV_OPT_t (1<<1)
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#define CATV_OPT_v (1<<2)
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struct BUG_const_mismatch {
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char BUG_const_mismatch[
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CATV_OPT_e == VISIBLE_ENDLINE && CATV_OPT_t == VISIBLE_SHOW_TABS
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? 1 : -1
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];
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};
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int catv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int catv_main(int argc UNUSED_PARAM, char **argv)
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{
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int retval = EXIT_SUCCESS;
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int fd;
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unsigned opts;
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opts = getopt32(argv, "etv");
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argv += optind;
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#if 0 /* These consts match, we can just pass "opts" to visible() */
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if (opts & CATV_OPT_e)
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flags |= VISIBLE_ENDLINE;
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if (opts & CATV_OPT_t)
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flags |= VISIBLE_SHOW_TABS;
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#endif
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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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#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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if (opts & CATV_OPT_v) {
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putchar(c);
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} else {
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char buf[sizeof("M-^c")];
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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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}
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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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