libiberty/lbasename.c

   1 /* Libiberty basename.  Like basename, but is not overridden by the
   2    system C library.
   3    Copyright (C) 2001 Free Software Foundation, Inc.
   4
   5 This file is part of the libiberty library.
   6 Libiberty is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU Library General Public
   8 License as published by the Free Software Foundation; either
   9 version 2 of the License, or (at your option) any later version.
  10
  11 Libiberty is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 Library General Public License for more details.
  15
  16 You should have received a copy of the GNU Library General Public
  17 License along with libiberty; see the file COPYING.LIB.  If
  18 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /*
  22
  23 @deftypefn Replacement {const char*} lbasename (const char *@var{name})
  24
  25 Given a pointer to a string containing a typical pathname
  26 (@samp{/usr/src/cmd/ls/ls.c} for example), returns a pointer to the
  27 last component of the pathname (@samp{ls.c} in this case).  The
  28 returned pointer is guaranteed to lie within the original
  29 string.  This latter fact is not true of many vendor C
  30 libraries, which return special strings or modify the passed
  31 strings for particular input.
  32
  33 In particular, the empty string returns the same empty string,
  34 and a path ending in @code{/} returns the empty string after it.
  35
  36 @end deftypefn
  37
  38 */
  39
  40 #include "ansidecl.h"
  41 #include "libiberty.h"
  42 #include "safe-ctype.h"
  43
  44 #ifndef DIR_SEPARATOR
  45 #  define DIR_SEPARATOR '/'
  46 #endif
  47
  48 #if defined (_WIN32) || defined (__MSDOS__) \
  49     || defined (__DJGPP__) || defined (__OS2__)
  50 #  define HAVE_DOS_BASED_FILE_SYSTEM
  51 #  ifndef DIR_SEPARATOR_2
  52 #    define DIR_SEPARATOR_2 '\\'
  53 #  endif
  54 #endif
  55
  56 /* Define IS_DIR_SEPARATOR. VMS uses '::', ':', '[...]' and '<...>' to
  57    separate the different components of a file specification.  It's a
  58    bit of a stretch to call ':', ']' and '>' directory separators, so
  59    just define the test to find the file name component.  */
  60 #ifdef VMS
  61 #  define IS_DIR_SEPARATOR(ch) ((ch) == ':' || (ch) == ']' || (ch) == '>')
  62 #else
  63 #  ifndef DIR_SEPARATOR_2
  64 #    define IS_DIR_SEPARATOR(ch) ((ch) == DIR_SEPARATOR)
  65 #  else
  66 #    define IS_DIR_SEPARATOR(ch) \
  67         (((ch) == DIR_SEPARATOR) || ((ch) == DIR_SEPARATOR_2))
  68 #  endif
  69 #endif
  70
  71 const char *
  72 lbasename (name)
  73      const char *name;
  74 {
  75   const char *base;
  76
  77 #if defined (HAVE_DOS_BASED_FILE_SYSTEM)
  78   /* Skip over a possible disk name.  */
  79   if (ISALPHA (name[0]) && name[1] == ':')
  80     name += 2;
  81 #endif
  82
  83   for (base = name; *name; name++)
  84     if (IS_DIR_SEPARATOR (*name))
  85       base = name + 1;
  86
  87   return base;
  88 }