1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2010 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                  Common Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*            http://www.opensource.org/licenses/cpl1.0.txt             *
11*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#pragma prototyped
23/*
24 * dirname(3) implementation
25 */
26
27#include <ast_std.h>
28
29#if defined(__EXPORT__)
30#define extern	__EXPORT__
31#endif
32
33extern char *dirname(register char *pathname)
34{
35	register char  *last;
36	/* go to end of path */
37	for(last=pathname; *last; last++);
38	/* back over trailing '/' */
39	while(last>pathname && *--last=='/');
40	/* back over non-slash chars */
41	for(;last>pathname && *last!='/';last--);
42	if(last==pathname)
43	{
44		/* all '/' or "" */
45		if(*last!='/')
46			*last = '.';
47		/* preserve // */
48		else if(last[1]=='/')
49			last++;
50	}
51	else
52	{
53		/* back over trailing '/' */
54		for(;*last=='/' && last > pathname; last--);
55		/* preserve // */
56		if(last==pathname && *pathname=='/' && pathname[1]=='/')
57			last++;
58	}
59	*(last + 1) = 0;
60	return(pathname);
61}
62