1 /* vi: set sw=4 ts=4: */
3 * cat -v implementation for busybox
5 * Copyright (C) 2006 Rob Landley <rob@landley.net>
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 /* See "Cat -v considered harmful" at
11 * http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz */
17 //config: Display nonprinting characters as escape sequences (like some
18 //config: implementations' cat -v option).
20 //applet:IF_CATV(APPLET(catv, BB_DIR_BIN, BB_SUID_DROP))
22 //kbuild:lib-$(CONFIG_CATV) += catv.o
24 //usage:#define catv_trivial_usage
25 //usage: "[-etv] [FILE]..."
26 //usage:#define catv_full_usage "\n\n"
27 //usage: "Display nonprinting characters as ^x or M-x\n"
28 //usage: "\n -e End each line with $"
29 //usage: "\n -t Show tabs as ^I"
30 //usage: "\n -v Don't use ^x or M-x escapes"
33 #include "common_bufsiz.h"
35 #define CATV_OPT_e (1<<0)
36 #define CATV_OPT_t (1<<1)
37 #define CATV_OPT_v (1<<2)
38 struct BUG_const_mismatch {
39 char BUG_const_mismatch[
40 CATV_OPT_e == VISIBLE_ENDLINE && CATV_OPT_t == VISIBLE_SHOW_TABS
45 int catv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
46 int catv_main(int argc UNUSED_PARAM, char **argv)
48 int retval = EXIT_SUCCESS;
51 opts = getopt32(argv, "etv");
53 #if 0 /* These consts match, we can just pass "opts" to visible() */
54 if (opts & CATV_OPT_e)
55 flags |= VISIBLE_ENDLINE;
56 if (opts & CATV_OPT_t)
57 flags |= VISIBLE_SHOW_TABS;
60 /* Read from stdin if there's nothing else to do. */
64 #define read_buf bb_common_bufsiz1
65 setup_common_bufsiz();
67 fd = open_or_warn_stdin(*argv);
69 retval = EXIT_FAILURE;
75 res = read(fd, read_buf, COMMON_BUFSIZE);
77 retval = EXIT_FAILURE;
80 for (i = 0; i < res; i++) {
81 unsigned char c = read_buf[i];
82 if (opts & CATV_OPT_v) {
85 char buf[sizeof("M-^c")];
86 visible(c, buf, opts);
91 if (ENABLE_FEATURE_CLEAN_UP && fd)
95 fflush_stdout_and_exit(retval);