blob: 65978887e149bc939c2184b61efb7e67480cffb0
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 | //config:config CAT |
10 | //config: bool "cat" |
11 | //config: default y |
12 | //config: help |
13 | //config: cat is used to concatenate files and print them to the standard |
14 | //config: output. Enable this option if you wish to enable the 'cat' utility. |
15 | |
16 | //applet:IF_CAT(APPLET_NOFORK(cat, cat, BB_DIR_BIN, BB_SUID_DROP, cat)) |
17 | |
18 | //kbuild:lib-$(CONFIG_CAT) += cat.o |
19 | |
20 | /* BB_AUDIT SUSv3 compliant */ |
21 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/cat.html */ |
22 | |
23 | //usage:#define cat_trivial_usage |
24 | //usage: "[FILE]..." |
25 | //usage:#define cat_full_usage "\n\n" |
26 | //usage: "Concatenate FILEs and print them to stdout" |
27 | //usage: |
28 | //usage:#define cat_example_usage |
29 | //usage: "$ cat /proc/uptime\n" |
30 | //usage: "110716.72 17.67" |
31 | |
32 | #include "libbb.h" |
33 | |
34 | /* This is a NOFORK applet. Be very careful! */ |
35 | |
36 | |
37 | int bb_cat(char **argv) |
38 | { |
39 | int fd; |
40 | int retval = EXIT_SUCCESS; |
41 | |
42 | if (!*argv) |
43 | argv = (char**) &bb_argv_dash; |
44 | |
45 | do { |
46 | fd = open_or_warn_stdin(*argv); |
47 | if (fd >= 0) { |
48 | /* This is not a xfunc - never exits */ |
49 | off_t r = bb_copyfd_eof(fd, STDOUT_FILENO); |
50 | if (fd != STDIN_FILENO) |
51 | close(fd); |
52 | if (r >= 0) |
53 | continue; |
54 | } |
55 | retval = EXIT_FAILURE; |
56 | } while (*++argv); |
57 | |
58 | return retval; |
59 | } |
60 | |
61 | int cat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
62 | int cat_main(int argc UNUSED_PARAM, char **argv) |
63 | { |
64 | getopt32(argv, "u"); |
65 | argv += optind; |
66 | return bb_cat(argv); |
67 | } |
68 |