97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/* 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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