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 */
13 //usage:#define catv_trivial_usage
14 //usage: "[-etv] [FILE]..."
15 //usage:#define catv_full_usage "\n\n"
16 //usage: "Display nonprinting characters as ^x or M-x\n"
17 //usage: "\n -e End each line with $"
18 //usage: "\n -t Show tabs as ^I"
19 //usage: "\n -v Don't use ^x or M-x escapes"
22 #include "common_bufsiz.h"
24 #define CATV_OPT_e (1<<0)
25 #define CATV_OPT_t (1<<1)
26 #define CATV_OPT_v (1<<2)
27 struct BUG_const_mismatch
{
28 char BUG_const_mismatch
[
29 CATV_OPT_e
== VISIBLE_ENDLINE
&& CATV_OPT_t
== VISIBLE_SHOW_TABS
34 int catv_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
35 int catv_main(int argc UNUSED_PARAM
, char **argv
)
37 int retval
= EXIT_SUCCESS
;
40 opts
= getopt32(argv
, "etv");
42 #if 0 /* These consts match, we can just pass "opts" to visible() */
43 if (opts
& CATV_OPT_e
)
44 flags
|= VISIBLE_ENDLINE
;
45 if (opts
& CATV_OPT_t
)
46 flags
|= VISIBLE_SHOW_TABS
;
49 /* Read from stdin if there's nothing else to do. */
53 #define read_buf bb_common_bufsiz1
54 setup_common_bufsiz();
56 fd
= open_or_warn_stdin(*argv
);
58 retval
= EXIT_FAILURE
;
64 res
= read(fd
, read_buf
, COMMON_BUFSIZE
);
66 retval
= EXIT_FAILURE
;
69 for (i
= 0; i
< res
; i
++) {
70 unsigned char c
= read_buf
[i
];
71 if (opts
& CATV_OPT_v
) {
74 char buf
[sizeof("M-^c")];
75 visible(c
, buf
, opts
);
80 if (ENABLE_FEATURE_CLEAN_UP
&& fd
)
84 fflush_stdout_and_exit(retval
);