lbasename.c: New file.

[thirdparty/gcc.git] / libiberty / lbasename.c

diff --git a/libiberty/lbasename.c b/libiberty/lbasename.c
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+/* Libiberty basename.  Like basename, but is not overridden by the
+   system C library.
+   Copyright (C) 2001 Free Software Foundation, Inc.
+
+This file is part of the libiberty library.
+Libiberty is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+Libiberty is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with libiberty; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/*
+NAME
+       lbasename -- return pointer to last component of a pathname
+
+SYNOPSIS
+       char *lbasename (const char *name)
+
+DESCRIPTION
+       Given a pointer to a string containing a typical pathname
+       (/usr/src/cmd/ls/ls.c for example), returns a pointer to the
+       last component of the pathname ("ls.c" in this case).  The
+       returned pointer is guaranteed to lie within the original
+       string.  This latter fact is not true of many vendor C
+       libraries, which return special strings or modify the passed
+       strings for particular input.
+
+       In particular, the empty string returns the same empty string,
+       and a path ending in '/' returns the empty string after it.
+*/
+
+#include "ansidecl.h"
+#include "libiberty.h"
+#include "safe-ctype.h"
+
+#ifndef DIR_SEPARATOR
+#  define DIR_SEPARATOR '/'
+#endif
+
+#if defined (_WIN32) || defined (__MSDOS__) \
+    || defined (__DJGPP__) || defined (__OS2__)
+#  define HAVE_DOS_BASED_FILE_SYSTEM
+#  ifndef DIR_SEPARATOR_2 
+#    define DIR_SEPARATOR_2 '\\'
+#  endif
+#endif
+
+/* Define IS_DIR_SEPARATOR. VMS uses '::', ':', '[...]' and '<...>' to
+   separate the different components of a file specification.  It's a
+   bit of a stretch to call ':', ']' and '>' directory separators, so
+   just define the test to find the file name component.  */
+#ifdef VMS
+#  define IS_DIR_SEPARATOR(ch) ((ch) == ':' || (ch) == ']' || (ch) == '>')
+#else
+#  ifndef DIR_SEPARATOR_2
+#    define IS_DIR_SEPARATOR(ch) ((ch) == DIR_SEPARATOR)
+#  else
+#    define IS_DIR_SEPARATOR(ch) \
+       (((ch) == DIR_SEPARATOR) || ((ch) == DIR_SEPARATOR_2))
+#  endif
+#endif
+
+char *
+lbasename (name)
+     const char *name;
+{
+  const char *base;
+
+#if defined (HAVE_DOS_BASED_FILE_SYSTEM)
+  /* Skip over a possible disk name.  */
+  if (ISALPHA (name[0]) && name[1] == ':') 
+    name += 2;
+#endif
+
+  for (base = name; *name; name++)
+    if (IS_DIR_SEPARATOR (*name))
+      base = name + 1;
+
+  return (char *) base;
+}