1/*********************************************************************** 2* * 3* This software is part of the ast package * 4* Copyright (c) 1985-2011 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