| /* vi: set sw=4 ts=4: */ |
| /* |
| * cat implementation for busybox |
| * |
| * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org> |
| * |
| * Licensed under GPLv2, see file LICENSE in this source tree. |
| */ |
| //config:config CAT |
| //config: bool "cat" |
| //config: default y |
| //config: help |
| //config: cat is used to concatenate files and print them to the standard |
| //config: output. Enable this option if you wish to enable the 'cat' utility. |
| |
| //applet:IF_CAT(APPLET_NOFORK(cat, cat, BB_DIR_BIN, BB_SUID_DROP, cat)) |
| |
| //kbuild:lib-$(CONFIG_CAT) += cat.o |
| |
| /* BB_AUDIT SUSv3 compliant */ |
| /* http://www.opengroup.org/onlinepubs/007904975/utilities/cat.html */ |
| |
| //usage:#define cat_trivial_usage |
| //usage: "[FILE]..." |
| //usage:#define cat_full_usage "\n\n" |
| //usage: "Concatenate FILEs and print them to stdout" |
| //usage: |
| //usage:#define cat_example_usage |
| //usage: "$ cat /proc/uptime\n" |
| //usage: "110716.72 17.67" |
| |
| #include "libbb.h" |
| |
| /* This is a NOFORK applet. Be very careful! */ |
| |
| |
| int bb_cat(char **argv) |
| { |
| int fd; |
| int retval = EXIT_SUCCESS; |
| |
| if (!*argv) |
| argv = (char**) &bb_argv_dash; |
| |
| do { |
| fd = open_or_warn_stdin(*argv); |
| if (fd >= 0) { |
| /* This is not a xfunc - never exits */ |
| off_t r = bb_copyfd_eof(fd, STDOUT_FILENO); |
| if (fd != STDIN_FILENO) |
| close(fd); |
| if (r >= 0) |
| continue; |
| } |
| retval = EXIT_FAILURE; |
| } while (*++argv); |
| |
| return retval; |
| } |
| |
| int cat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int cat_main(int argc UNUSED_PARAM, char **argv) |
| { |
| getopt32(argv, "u"); |
| argv += optind; |
| return bb_cat(argv); |
| } |