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 int catv_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
24 int catv_main(int argc UNUSED_PARAM
, char **argv
)
26 int retval
= EXIT_SUCCESS
;
30 flags
= getopt32(argv
, "etv");
31 #define CATV_OPT_e (1<<0)
32 #define CATV_OPT_t (1<<1)
33 #define CATV_OPT_v (1<<2)
37 /* Read from stdin if there's nothing else to do. */
41 fd
= open_or_warn_stdin(*argv
);
43 retval
= EXIT_FAILURE
;
49 #define read_buf bb_common_bufsiz1
50 res
= read(fd
, read_buf
, COMMON_BUFSIZE
);
52 retval
= EXIT_FAILURE
;
55 for (i
= 0; i
< res
; i
++) {
56 unsigned char c
= read_buf
[i
];
58 if (c
> 126 && (flags
& CATV_OPT_v
)) {
68 if (flags
& CATV_OPT_e
)
70 } else if (flags
& (c
==9 ? CATV_OPT_t
: CATV_OPT_v
)) {
78 if (ENABLE_FEATURE_CLEAN_UP
&& fd
)
82 fflush_stdout_and_exit(retval
);