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 #include "libbb.h"
  32
  33 /* This is a NOFORK applet. Be very careful! */
  34
  35 int basename_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  36 int basename_main(int argc, char **argv)
  37 {
  38         size_t m, n;
  39         char *s;
  40
  41         if ((unsigned)(argc-2) >= 2) {
  42                 bb_show_usage();
  43         }
  44
  45         /* It should strip slash: /abc/def/ -> def */
  46         s = bb_get_last_path_component_strip(*++argv);
  47
  48         m = strlen(s);
  49         if (*++argv) {
  50                 n = strlen(*argv);
  51                 if ((m > n) && (strcmp(s+m-n, *argv) == 0)) {
  52                         m -= n;
  53                         /*s[m] = '\0'; - redundant */
  54                 }
  55         }
  56
  57         /* puts(s) will do, but we can do without stdio this way: */
  58         s[m++] = '\n';
  59         /* NB: != is correct here: */
  60         return full_write(STDOUT_FILENO, s, m) != (ssize_t)m;
  61 }