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"
23 #define CATV_OPT_e (1<<0)
24 #define CATV_OPT_t (1<<1)
25 #define CATV_OPT_v (1<<2)
26 struct BUG_const_mismatch
{
27 char BUG_const_mismatch
[
28 CATV_OPT_e
== VISIBLE_ENDLINE
&& CATV_OPT_t
== VISIBLE_SHOW_TABS
33 int catv_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
34 int catv_main(int argc UNUSED_PARAM
, char **argv
)
36 int retval
= EXIT_SUCCESS
;
39 opts
= getopt32(argv
, "etv");
41 #if 0 /* These consts match, we can just pass "opts" to visible() */
42 if (opts
& CATV_OPT_e
)
43 flags
|= VISIBLE_ENDLINE
;
44 if (opts
& CATV_OPT_t
)
45 flags
|= VISIBLE_SHOW_TABS
;
48 /* Read from stdin if there's nothing else to do. */
52 fd
= open_or_warn_stdin(*argv
);
54 retval
= EXIT_FAILURE
;
60 #define read_buf bb_common_bufsiz1
61 res
= read(fd
, read_buf
, COMMON_BUFSIZE
);
63 retval
= EXIT_FAILURE
;
66 for (i
= 0; i
< res
; i
++) {
67 unsigned char c
= read_buf
[i
];
68 if (opts
& CATV_OPT_v
) {
71 char buf
[sizeof("M-^c")];
72 visible(c
, buf
, opts
);
77 if (ENABLE_FEATURE_CLEAN_UP
&& fd
)
81 fflush_stdout_and_exit(retval
);