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