1da2e3ebdSchin /***********************************************************************
2da2e3ebdSchin *                                                                      *
3da2e3ebdSchin *               This software is part of the ast package               *
4*b30d1939SAndy Fiddaman *          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5da2e3ebdSchin *                      and is licensed under the                       *
6*b30d1939SAndy Fiddaman *                 Eclipse Public License, Version 1.0                  *
77c2fbfb3SApril Chin *                    by AT&T Intellectual Property                     *
8da2e3ebdSchin *                                                                      *
9da2e3ebdSchin *                A copy of the License is available at                 *
10*b30d1939SAndy Fiddaman *          http://www.eclipse.org/org/documents/epl-v10.html           *
11*b30d1939SAndy Fiddaman *         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
12da2e3ebdSchin *                                                                      *
13da2e3ebdSchin *              Information and Software Systems Research               *
14da2e3ebdSchin *                            AT&T Research                             *
15da2e3ebdSchin *                           Florham Park NJ                            *
16da2e3ebdSchin *                                                                      *
17da2e3ebdSchin *                 Glenn Fowler <gsf@research.att.com>                  *
18da2e3ebdSchin *                  David Korn <dgk@research.att.com>                   *
19da2e3ebdSchin *                   Phong Vo <kpv@research.att.com>                    *
20da2e3ebdSchin *                                                                      *
21da2e3ebdSchin ***********************************************************************/
22da2e3ebdSchin #pragma prototyped
23da2e3ebdSchin /*
24da2e3ebdSchin  * dirname(3) implementation
25da2e3ebdSchin  */
26da2e3ebdSchin 
27da2e3ebdSchin #include <ast_std.h>
28da2e3ebdSchin 
29da2e3ebdSchin #if defined(__EXPORT__)
30da2e3ebdSchin #define extern	__EXPORT__
31da2e3ebdSchin #endif
32da2e3ebdSchin 
dirname(register char * pathname)33da2e3ebdSchin extern char *dirname(register char *pathname)
34da2e3ebdSchin {
35da2e3ebdSchin 	register char  *last;
36da2e3ebdSchin 	/* go to end of path */
37da2e3ebdSchin 	for(last=pathname; *last; last++);
38da2e3ebdSchin 	/* back over trailing '/' */
39da2e3ebdSchin 	while(last>pathname && *--last=='/');
40da2e3ebdSchin 	/* back over non-slash chars */
41da2e3ebdSchin 	for(;last>pathname && *last!='/';last--);
42da2e3ebdSchin 	if(last==pathname)
43da2e3ebdSchin 	{
44da2e3ebdSchin 		/* all '/' or "" */
45da2e3ebdSchin 		if(*last!='/')
46da2e3ebdSchin 			*last = '.';
47da2e3ebdSchin 		/* preserve // */
48da2e3ebdSchin 		else if(last[1]=='/')
49da2e3ebdSchin 			last++;
50da2e3ebdSchin 	}
51da2e3ebdSchin 	else
52da2e3ebdSchin 	{
53da2e3ebdSchin 		/* back over trailing '/' */
54da2e3ebdSchin 		for(;*last=='/' && last > pathname; last--);
55da2e3ebdSchin 		/* preserve // */
56da2e3ebdSchin 		if(last==pathname && *pathname=='/' && pathname[1]=='/')
57da2e3ebdSchin 			last++;
58da2e3ebdSchin 	}
59da2e3ebdSchin 	*(last + 1) = 0;
60da2e3ebdSchin 	return(pathname);
61da2e3ebdSchin }
62