release/src/router/busybox/coreutils/basename.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini basename implementation for busybox
   4  *
   5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9
  10 /* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
  11  *
  12  * Changes:
  13  * 1) Now checks for too many args.  Need at least one and at most two.
  14  * 2) Don't check for options, as per SUSv3.
  15  * 3) Save some space by using strcmp().  Calling strncmp() here was silly.
  16  */
  17
  18 /* BB_AUDIT SUSv3 compliant */
  19 /* http://www.opengroup.org/onlinepubs/007904975/utilities/basename.html */
  20
  21 //kbuild:lib-$(CONFIG_BASENAME) += basename.o
  22
  23 //config:config BASENAME
  24 //config:       bool "basename"
  25 //config:       default y
  26 //config:       help
  27 //config:         basename is used to strip the directory and suffix from filenames,
  28 //config:         leaving just the filename itself. Enable this option if you wish
  29 //config:         to enable the 'basename' utility.
  30
  31 //usage:#define basename_trivial_usage
  32 //usage:       "FILE [SUFFIX]"
  33 //usage:#define basename_full_usage "\n\n"
  34 //usage:       "Strip directory path and .SUFFIX from FILE\n"
  35 //usage:
  36 //usage:#define basename_example_usage
  37 //usage:       "$ basename /usr/local/bin/foo\n"
  38 //usage:       "foo\n"
  39 //usage:       "$ basename /usr/local/bin/\n"
  40 //usage:       "bin\n"
  41 //usage:       "$ basename /foo/bar.txt .txt\n"
  42 //usage:       "bar"
  43
  44 #include "libbb.h"
  45
  46 /* This is a NOFORK applet. Be very careful! */
  47
  48 int basename_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  49 int basename_main(int argc, char **argv)
  50 {
  51         size_t m, n;
  52         char *s;
  53
  54         if (argv[1] && strcmp(argv[1], "--") == 0) {
  55                 argv++;
  56                 argc--;
  57         }
  58
  59         if ((unsigned)(argc-2) >= 2) {
  60                 bb_show_usage();
  61         }
  62
  63         /* It should strip slash: /abc/def/ -> def */
  64         s = bb_get_last_path_component_strip(*++argv);
  65
  66         m = strlen(s);
  67         if (*++argv) {
  68                 n = strlen(*argv);
  69                 if ((m > n) && (strcmp(s+m-n, *argv) == 0)) {
  70                         m -= n;
  71                         /*s[m] = '\0'; - redundant */
  72                 }
  73         }
  74
  75         /* puts(s) will do, but we can do without stdio this way: */
  76         s[m++] = '\n';
  77         /* NB: != is correct here: */
  78         return full_write(STDOUT_FILENO, s, m) != (ssize_t)m;
  79 }