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 * Eclipse Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.eclipse.org/org/documents/epl-v10.html * 11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) * 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 * Glenn Fowler 25 * AT&T Bell Laboratories 26 * 27 * return path to file a/b with access mode using : separated dirs 28 * both a and b may be 0 29 * if a==".." then relative paths in dirs are ignored 30 * if (mode&PATH_REGULAR) then path must not be a directory 31 * if (mode&PATH_ABSOLUTE) then path must be rooted 32 * path returned in path buffer 33 */ 34 35 #define _AST_API_H 1 36 37 #include <ast.h> 38 39 char* pathaccess(char * path,const char * dirs,const char * a,const char * b,int mode)40 pathaccess(char* path, const char* dirs, const char* a, const char* b, int mode) 41 { 42 return pathaccess_20100601(dirs, a, b, mode, path, PATH_MAX); 43 } 44 45 #undef _AST_API_H 46 47 #include <ast_api.h> 48 49 char* pathaccess_20100601(register const char * dirs,const char * a,const char * b,register int mode,register char * path,size_t size)50 pathaccess_20100601(register const char* dirs, const char* a, const char* b, register int mode, register char* path, size_t size) 51 { 52 int sib = a && a[0] == '.' && a[1] == '.' && a[2] == 0; 53 int sep = ':'; 54 char cwd[PATH_MAX]; 55 56 do 57 { 58 dirs = pathcat(dirs, sep, a, b, path, size); 59 pathcanon(path, size, 0); 60 if ((!sib || *path == '/') && pathexists(path, mode)) 61 { 62 if (*path == '/' || !(mode & PATH_ABSOLUTE)) 63 return path; 64 dirs = getcwd(cwd, sizeof(cwd)); 65 sep = 0; 66 } 67 } while (dirs); 68 return 0; 69 } 70