gnu/dist/gettext/gettext-tools/lib/basename.c

   1 /* Return the name-within-directory of a file name.
   2    Copyright (C) 1996-1999, 2000-2002, 2004 Free Software Foundation, Inc.
   3
   4    NOTE: The canonical source of this file is maintained with the GNU C Library.
   5    Bugs can be reported to bug-glibc@gnu.org.
   6
   7    This program is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published by the
   9    Free Software Foundation; either version 2, or (at your option) any
  10    later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  20    USA.  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 # include <config.h>
  24 #endif
  25
  26 /* Specification.  */
  27 #include "basename.h"
  28
  29 #if !(__GLIBC__ >= 2)
  30
  31 #include <stdio.h>
  32 #include <assert.h>
  33
  34 #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__
  35   /* Win32, Cygwin, OS/2, DOS */
  36 # define HAS_DEVICE(P) \
  37     ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \
  38      && (P)[1] == ':')
  39 # define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
  40 # define ISSLASH(C) ((C) == '/' || (C) == '\\')
  41 #endif
  42
  43 #ifndef FILE_SYSTEM_PREFIX_LEN
  44 # define FILE_SYSTEM_PREFIX_LEN(Filename) 0
  45 #endif
  46
  47 #ifndef ISSLASH
  48 # define ISSLASH(C) ((C) == '/')
  49 #endif
  50
  51 #ifndef _LIBC
  52 /* We cannot generally use the name `basename' since XPG defines an unusable
  53    variant of the function but we cannot use it.  */
  54 # undef basename
  55 # define basename gnu_basename
  56 #endif
  57
  58 /* In general, we can't use the builtin `basename' function if available,
  59    since it has different meanings in different environments.
  60    In some environments the builtin `basename' modifies its argument.
  61    If NAME is all slashes, be sure to return `/'.  */
  62
  63 char *
  64 basename (char const *name)
  65 {
  66   char const *base = name += FILE_SYSTEM_PREFIX_LEN (name);
  67   int all_slashes = 1;
  68   char const *p;
  69
  70   for (p = name; *p; p++)
  71     {
  72       if (ISSLASH (*p))
  73         base = p + 1;
  74       else
  75         all_slashes = 0;
  76     }
  77
  78   /* If NAME is all slashes, arrange to return `/'.  */
  79   if (*base == '\0' && ISSLASH (*name) && all_slashes)
  80     --base;
  81
  82   /* Make sure the last byte is not a slash.  */
  83   assert (all_slashes || !ISSLASH (*(p - 1)));
  84
  85   return (char *) base;
  86 }
  87
  88 #endif