blob: e3499c59787947c56f64522312d1f46fcce55190
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 source tree. |
8 | */ |
9 | |
10 | /* See "Cat -v considered harmful" at |
11 | * http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz */ |
12 | |
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" |
20 | |
21 | #include "libbb.h" |
22 | |
23 | int catv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
24 | int catv_main(int argc UNUSED_PARAM, char **argv) |
25 | { |
26 | int retval = EXIT_SUCCESS; |
27 | int fd; |
28 | unsigned opts; |
29 | #define CATV_OPT_e (1<<0) |
30 | #define CATV_OPT_t (1<<1) |
31 | #define CATV_OPT_v (1<<2) |
32 | typedef char BUG_const_mismatch[ |
33 | CATV_OPT_e == VISIBLE_ENDLINE && CATV_OPT_t == VISIBLE_SHOW_TABS |
34 | ? 1 : -1 |
35 | ]; |
36 | |
37 | opts = getopt32(argv, "etv"); |
38 | argv += optind; |
39 | #if 0 /* These consts match, we can just pass "opts" to visible() */ |
40 | if (opts & CATV_OPT_e) |
41 | flags |= VISIBLE_ENDLINE; |
42 | if (opts & CATV_OPT_t) |
43 | flags |= VISIBLE_SHOW_TABS; |
44 | #endif |
45 | |
46 | /* Read from stdin if there's nothing else to do. */ |
47 | if (!argv[0]) |
48 | *--argv = (char*)"-"; |
49 | do { |
50 | fd = open_or_warn_stdin(*argv); |
51 | if (fd < 0) { |
52 | retval = EXIT_FAILURE; |
53 | continue; |
54 | } |
55 | for (;;) { |
56 | int i, res; |
57 | |
58 | #define read_buf bb_common_bufsiz1 |
59 | res = read(fd, read_buf, COMMON_BUFSIZE); |
60 | if (res < 0) |
61 | retval = EXIT_FAILURE; |
62 | if (res <= 0) |
63 | break; |
64 | for (i = 0; i < res; i++) { |
65 | unsigned char c = read_buf[i]; |
66 | if (opts & CATV_OPT_v) { |
67 | putchar(c); |
68 | } else { |
69 | char buf[sizeof("M-^c")]; |
70 | visible(c, buf, opts); |
71 | fputs(buf, stdout); |
72 | } |
73 | } |
74 | } |
75 | if (ENABLE_FEATURE_CLEAN_UP && fd) |
76 | close(fd); |
77 | } while (*++argv); |
78 | |
79 | fflush_stdout_and_exit(retval); |
80 | } |
81 |