14887Schin /*********************************************************************** 24887Schin * * 34887Schin * This software is part of the ast package * 4*12068SRoger.Faulkner@Oracle.COM * Copyright (c) 1985-2010 AT&T Intellectual Property * 54887Schin * and is licensed under the * 64887Schin * Common Public License, Version 1.0 * 78462SApril.Chin@Sun.COM * by AT&T Intellectual Property * 84887Schin * * 94887Schin * A copy of the License is available at * 104887Schin * http://www.opensource.org/licenses/cpl1.0.txt * 114887Schin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 124887Schin * * 134887Schin * Information and Software Systems Research * 144887Schin * AT&T Research * 154887Schin * Florham Park NJ * 164887Schin * * 174887Schin * Glenn Fowler <gsf@research.att.com> * 184887Schin * David Korn <dgk@research.att.com> * 194887Schin * Phong Vo <kpv@research.att.com> * 204887Schin * * 214887Schin ***********************************************************************/ 224887Schin #pragma prototyped 234887Schin /* 244887Schin * dirname(3) implementation 254887Schin */ 264887Schin 274887Schin #include <ast_std.h> 284887Schin 294887Schin #if defined(__EXPORT__) 304887Schin #define extern __EXPORT__ 314887Schin #endif 324887Schin dirname(register char * pathname)334887Schinextern char *dirname(register char *pathname) 344887Schin { 354887Schin register char *last; 364887Schin /* go to end of path */ 374887Schin for(last=pathname; *last; last++); 384887Schin /* back over trailing '/' */ 394887Schin while(last>pathname && *--last=='/'); 404887Schin /* back over non-slash chars */ 414887Schin for(;last>pathname && *last!='/';last--); 424887Schin if(last==pathname) 434887Schin { 444887Schin /* all '/' or "" */ 454887Schin if(*last!='/') 464887Schin *last = '.'; 474887Schin /* preserve // */ 484887Schin else if(last[1]=='/') 494887Schin last++; 504887Schin } 514887Schin else 524887Schin { 534887Schin /* back over trailing '/' */ 544887Schin for(;*last=='/' && last > pathname; last--); 554887Schin /* preserve // */ 564887Schin if(last==pathname && *pathname=='/' && pathname[1]=='/') 574887Schin last++; 584887Schin } 594887Schin *(last + 1) = 0; 604887Schin return(pathname); 614887Schin } 62