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 39char* 40pathaccess(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 49char* 50pathaccess_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