1*4887Schin /*********************************************************************** 2*4887Schin * * 3*4887Schin * This software is part of the ast package * 4*4887Schin * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5*4887Schin * and is licensed under the * 6*4887Schin * Common Public License, Version 1.0 * 7*4887Schin * by AT&T Knowledge Ventures * 8*4887Schin * * 9*4887Schin * A copy of the License is available at * 10*4887Schin * http://www.opensource.org/licenses/cpl1.0.txt * 11*4887Schin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12*4887Schin * * 13*4887Schin * Information and Software Systems Research * 14*4887Schin * AT&T Research * 15*4887Schin * Florham Park NJ * 16*4887Schin * * 17*4887Schin * Glenn Fowler <gsf@research.att.com> * 18*4887Schin * David Korn <dgk@research.att.com> * 19*4887Schin * Phong Vo <kpv@research.att.com> * 20*4887Schin * * 21*4887Schin ***********************************************************************/ 22*4887Schin #pragma prototyped 23*4887Schin /* 24*4887Schin * Glenn Fowler 25*4887Schin * AT&T Research 26*4887Schin * 27*4887Schin * return full path to p with mode access using $PATH 28*4887Schin * a!=0 enables related root search 29*4887Schin * a!=0 && a!="" searches a dir first 30*4887Schin * the related root must have a bin subdir 31*4887Schin * p==0 sets the cached relative dir to a 32*4887Schin * full path returned in path buffer 33*4887Schin * if path==0 then the space is malloc'd 34*4887Schin */ 35*4887Schin 36*4887Schin #include <ast.h> 37*4887Schin 38*4887Schin char* 39*4887Schin pathpath(register char* path, const char* p, const char* a, int mode) 40*4887Schin { 41*4887Schin register char* s; 42*4887Schin char* x; 43*4887Schin char buf[PATH_MAX]; 44*4887Schin 45*4887Schin static char* cmd; 46*4887Schin 47*4887Schin if (!path) 48*4887Schin path = buf; 49*4887Schin if (!p) 50*4887Schin { 51*4887Schin if (cmd) 52*4887Schin free(cmd); 53*4887Schin cmd = a ? strdup(a) : (char*)0; 54*4887Schin return 0; 55*4887Schin } 56*4887Schin if (strlen(p) < PATH_MAX) 57*4887Schin { 58*4887Schin strcpy(path, p); 59*4887Schin if (pathexists(path, mode)) 60*4887Schin { 61*4887Schin if (*p != '/' && (mode & PATH_ABSOLUTE)) 62*4887Schin { 63*4887Schin getcwd(buf, sizeof(buf)); 64*4887Schin s = buf + strlen(buf); 65*4887Schin sfsprintf(s, sizeof(buf) - (s - buf), "/%s", p); 66*4887Schin if (path != buf) 67*4887Schin strcpy(path, buf); 68*4887Schin } 69*4887Schin return (path == buf) ? strdup(path) : path; 70*4887Schin } 71*4887Schin } 72*4887Schin if (*p == '/') 73*4887Schin a = 0; 74*4887Schin else if (s = (char*)a) 75*4887Schin { 76*4887Schin x = s; 77*4887Schin if (strchr(p, '/')) 78*4887Schin { 79*4887Schin a = p; 80*4887Schin p = ".."; 81*4887Schin } 82*4887Schin else 83*4887Schin a = 0; 84*4887Schin if ((!cmd || *cmd) && (strchr(s, '/') || (s = cmd))) 85*4887Schin { 86*4887Schin if (!cmd && *s == '/') 87*4887Schin cmd = strdup(s); 88*4887Schin if (strlen(s) < (sizeof(buf) - 6)) 89*4887Schin { 90*4887Schin s = strcopy(path, s); 91*4887Schin for (;;) 92*4887Schin { 93*4887Schin do if (s <= path) goto normal; while (*--s == '/'); 94*4887Schin do if (s <= path) goto normal; while (*--s != '/'); 95*4887Schin strcpy(s + 1, "bin"); 96*4887Schin if (pathexists(path, PATH_EXECUTE)) 97*4887Schin { 98*4887Schin if (s = pathaccess(path, path, p, a, mode)) 99*4887Schin return path == buf ? strdup(s) : s; 100*4887Schin goto normal; 101*4887Schin } 102*4887Schin } 103*4887Schin normal: ; 104*4887Schin } 105*4887Schin } 106*4887Schin } 107*4887Schin x = !a && strchr(p, '/') ? "" : pathbin(); 108*4887Schin if (!(s = pathaccess(path, x, p, a, mode)) && !*x && (x = getenv("FPATH"))) 109*4887Schin s = pathaccess(path, x, p, a, mode); 110*4887Schin return (s && path == buf) ? strdup(s) : s; 111*4887Schin } 112