lib/basename.c

   1 /* basename.c -- return the last element in a path
   2    Copyright (C) 1990, 1998, 1999 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #if HAVE_CONFIG_H
  19 # include <config.h>
  20 #endif
  21
  22 #include <basename.h>
  23
  24 #ifndef FILESYSTEM_PREFIX_LEN
  25 # define FILESYSTEM_PREFIX_LEN(Filename) 0
  26 #endif
  27
  28 #ifndef ISSLASH
  29 # define ISSLASH(C) ((C) == '/')
  30 #endif
  31
  32 /* In general, we can't use the builtin `basename' function if available,
  33    since it has different meanings in different environments.
  34    In some environments the builtin `basename' modifies its argument.
  35    If NAME is all slashes, be sure to return `/'.  */
  36
  37 char *
  38 base_name (char const *name)
  39 {
  40   char const *base = name += FILESYSTEM_PREFIX_LEN (name);
  41   int all_slashes = 1;
  42   char const *p;
  43
  44   for (p = name; *p; p++)
  45     {
  46       if (ISSLASH (*p))
  47         base = p + 1;
  48       else
  49         all_slashes = 0;
  50     }
  51
  52   /* If NAME is all slashes, arrange to return `/'.  */
  53   if (*base == '\0' && ISSLASH (*name) && all_slashes)
  54     --base;
  55
  56   return (char *) base;
  57 }