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/* basename.c
*
* $Id$
*
* Provides an implementation of the "basename" function, conforming
* to SUSv3, with extensions to accommodate Win32 drive designators,
* and suitable for use on native Microsoft(R) Win32 platforms.
*
* Written by Keith Marshall <keithmarshall@users.sourceforge.net>
*
* This is free software. You may redistribute and/or modify it as you
* see fit, without restriction of copyright.
*
* This software is provided "as is", in the hope that it may be useful,
* but WITHOUT WARRANTY OF ANY KIND, not even any implied warranty of
* MERCHANTABILITY, nor of FITNESS FOR ANY PARTICULAR PURPOSE. At no
* time will the author accept any form of liability for any damages,
* however caused, resulting from the use of this software.
*
*/
#include <stdio.h>
#include <string.h>
#include <libgen.h>
#ifndef __cdecl /* If compiling on any non-Win32 platform ... */
#define __cdecl /* this may not be defined. */
#endif
__cdecl char *basename( char *path )
{
char *retname;
static char retfail[] = ".";
if( path && *path )
{
/* step over the drive designator, if present ...
* (FIXME: maybe should confirm *path is a valid drive designator).
*/
if( path[1] == ':' )
path += 2;
/* check again, just to ensure we still have a non-empty path name ... */
if( *path )
{
/* and, when we do ...
* scan from left to right, to the char after the final dir separator
*/
for( retname = path ; *path ; ++path )
{
if( (*path == '/') || (*path == '\\') )
{
/* we found a dir separator ...
* step over it, and any others which immediately follow it
*/
while( (*path == '/') || (*path == '\\') )
++path;
/* if we didn't reach the end of the path string ... */
if( *path )
/* then we have a new candidate for the base name */
retname = path;
/* otherwise ...
* strip off any trailing dir separators which we found
*/
else while( (path > retname) && ((*--path == '/') || (*path == '\\')) )
*path = '\0';
}
}
/* retname now points at the resolved base name ...
* if it's not empty, then we return it as it is, otherwise ...
* we must have had only dir separators in the original path name,
* so we return "/".
*/
return *retname ? retname : strcpy( retfail, "/" );
}
/* or we had an empty residual path name, after the drive designator,
* in which case we simply fall through ...
*/
}
/* and, if we get to here ...
* the path name is either NULL, or it decomposes to an empty string;
* in either case, we return the default value of "." in our static buffer,
* (but strcpy it, just in case the caller trashed it after a previous call).
*/
return strcpy( retfail, "." );
}
/* $RCSfile$: end of file */
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