1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 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 * Glenn Fowler 25 * AT&T Research 26 * 27 * return full path to p with mode access using $PATH 28 * a!=0 enables related root search 29 * a!=0 && a!="" searches a dir first 30 * the related root must have a bin subdir 31 * p==0 sets the cached relative dir to a 32 * full path returned in path buffer 33 * if path==0 then the space is malloc'd 34 */ 35 36 #include <ast.h> 37 38 char* 39 pathpath(register char* path, const char* p, const char* a, int mode) 40 { 41 register char* s; 42 char* x; 43 char buf[PATH_MAX]; 44 45 static char* cmd; 46 47 if (!path) 48 path = buf; 49 if (!p) 50 { 51 if (cmd) 52 free(cmd); 53 cmd = a ? strdup(a) : (char*)0; 54 return 0; 55 } 56 if (strlen(p) < PATH_MAX) 57 { 58 strcpy(path, p); 59 if (pathexists(path, mode)) 60 { 61 if (*p != '/' && (mode & PATH_ABSOLUTE)) 62 { 63 getcwd(buf, sizeof(buf)); 64 s = buf + strlen(buf); 65 sfsprintf(s, sizeof(buf) - (s - buf), "/%s", p); 66 if (path != buf) 67 strcpy(path, buf); 68 } 69 return (path == buf) ? strdup(path) : path; 70 } 71 } 72 if (*p == '/') 73 a = 0; 74 else if (s = (char*)a) 75 { 76 x = s; 77 if (strchr(p, '/')) 78 { 79 a = p; 80 p = ".."; 81 } 82 else 83 a = 0; 84 if ((!cmd || *cmd) && (strchr(s, '/') || (s = cmd))) 85 { 86 if (!cmd && *s == '/') 87 cmd = strdup(s); 88 if (strlen(s) < (sizeof(buf) - 6)) 89 { 90 s = strcopy(path, s); 91 for (;;) 92 { 93 do if (s <= path) goto normal; while (*--s == '/'); 94 do if (s <= path) goto normal; while (*--s != '/'); 95 strcpy(s + 1, "bin"); 96 if (pathexists(path, PATH_EXECUTE)) 97 { 98 if (s = pathaccess(path, path, p, a, mode)) 99 return path == buf ? strdup(s) : s; 100 goto normal; 101 } 102 } 103 normal: ; 104 } 105 } 106 } 107 x = !a && strchr(p, '/') ? "" : pathbin(); 108 if (!(s = pathaccess(path, x, p, a, mode)) && !*x && (x = getenv("FPATH"))) 109 s = pathaccess(path, x, p, a, mode); 110 return (s && path == buf) ? strdup(s) : s; 111 } 112