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