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 |