blob: 00c38d486ade6b718999b7b0026ce6fb951ca8c2
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * cat implementation for busybox |
4 | * |
5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org> |
6 | * |
7 | * Licensed under GPLv2, see file LICENSE in this source tree. |
8 | */ |
9 | |
10 | /* BB_AUDIT SUSv3 compliant */ |
11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/cat.html */ |
12 | |
13 | //kbuild:lib-$(CONFIG_CAT) += cat.o |
14 | //kbuild:lib-$(CONFIG_MORE) += cat.o # more uses it if stdout isn't a tty |
15 | //kbuild:lib-$(CONFIG_LESS) += cat.o # less too |
16 | //kbuild:lib-$(CONFIG_CRONTAB) += cat.o # crontab -l |
17 | |
18 | //config:config CAT |
19 | //config: bool "cat" |
20 | //config: default y |
21 | //config: help |
22 | //config: cat is used to concatenate files and print them to the standard |
23 | //config: output. Enable this option if you wish to enable the 'cat' utility. |
24 | |
25 | //usage:#define cat_trivial_usage |
26 | //usage: "[FILE]..." |
27 | //usage:#define cat_full_usage "\n\n" |
28 | //usage: "Concatenate FILEs and print them to stdout" |
29 | //usage: |
30 | //usage:#define cat_example_usage |
31 | //usage: "$ cat /proc/uptime\n" |
32 | //usage: "110716.72 17.67" |
33 | |
34 | #include "libbb.h" |
35 | |
36 | /* This is a NOFORK applet. Be very careful! */ |
37 | |
38 | |
39 | int bb_cat(char **argv) |
40 | { |
41 | int fd; |
42 | int retval = EXIT_SUCCESS; |
43 | |
44 | if (!*argv) |
45 | argv = (char**) &bb_argv_dash; |
46 | |
47 | do { |
48 | fd = open_or_warn_stdin(*argv); |
49 | if (fd >= 0) { |
50 | /* This is not a xfunc - never exits */ |
51 | off_t r = bb_copyfd_eof(fd, STDOUT_FILENO); |
52 | if (fd != STDIN_FILENO) |
53 | close(fd); |
54 | if (r >= 0) |
55 | continue; |
56 | } |
57 | retval = EXIT_FAILURE; |
58 | } while (*++argv); |
59 | |
60 | return retval; |
61 | } |
62 | |
63 | int cat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
64 | int cat_main(int argc UNUSED_PARAM, char **argv) |
65 | { |
66 | getopt32(argv, "u"); |
67 | argv += optind; |
68 | return bb_cat(argv); |
69 | } |
70 |