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basename.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2008 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * basename(3) implementation
 */

#include <ast_std.h>

#if defined(__EXPORT__)
#define extern    __EXPORT__
#endif

extern char *basename(register char *pathname)
{
      register char *first, *last;
      for(first=last=pathname; *last; last++);
      /* back over trailing '/' */
      if(last>first)
            while(*--last=='/' && last > first);
      if(last==first && *last=='/')
      {
            /* all '/' or "" */
            if(*first=='/')
                  if(*++last=='/')  /* keep leading // */
                        last++;
      }
      else
      {
            for(first=last++;first>pathname && *first!='/';first--);
            if(*first=='/')
                  first++;
      }
      *last = 0;
      return(first);
}

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