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-rw-r--r--coreutils/catv.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/coreutils/catv.c b/coreutils/catv.c
new file mode 100644
index 000000000..66f30693a
--- /dev/null
+++ b/coreutils/catv.c
@@ -0,0 +1,69 @@
1/* vi: set sw=4 ts=4: */
2/*
3 * cat -v implementation for busybox
4 *
5 * Copyright (C) 2006 Rob Landley <rob@landley.net>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10/* See "Cat -v considered harmful" at
11 * http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz */
12
13#include "busybox.h"
14
15int catv_main(int argc, char **argv)
16{
17 int retval = EXIT_SUCCESS, fd;
18 unsigned flags;
19
20 flags = getopt32(argc, argv, "etv");
21#define CATV_OPT_e (1<<0)
22#define CATV_OPT_t (1<<1)
23#define CATV_OPT_v (1<<2)
24 flags ^= CATV_OPT_v;
25
26 argv += optind;
27 do {
28 /* Read from stdin if there's nothing else to do. */
29 fd = 0;
30 if (*argv && 0 > (fd = xopen(*argv, O_RDONLY)))
31 retval = EXIT_FAILURE;
32 else for (;;) {
33 int i, res;
34
35 res = read(fd, bb_common_bufsiz1, sizeof(bb_common_bufsiz1));
36 if (res < 0)
37 retval = EXIT_FAILURE;
38 if (res < 1)
39 break;
40 for (i = 0; i < res; i++) {
41 char c = bb_common_bufsiz1[i];
42
43 if (c > 126 && (flags & CATV_OPT_v)) {
44 if (c == 127) {
45 printf("^?");
46 continue;
47 } else {
48 printf("M-");
49 c -= 128;
50 }
51 }
52 if (c < 32) {
53 if (c == 10) {
54 if (flags & CATV_OPT_e)
55 putchar('$');
56 } else if (flags & (c==9 ? CATV_OPT_t : CATV_OPT_v)) {
57 printf("^%c", c+'@');
58 continue;
59 }
60 }
61 putchar(c);
62 }
63 }
64 if (ENABLE_FEATURE_CLEAN_UP && fd)
65 close(fd);
66 } while (*++argv);
67
68 fflush_stdout_and_exit(retval);
69}