1 /** \ingroup popt 2 * \file popt/findme.c 3 */ 4 5 /* (C) 1998-2002 Red Hat, Inc. -- Licensing details are in the COPYING 6 file accompanying popt source distributions, available from 7 ftp://ftp.rpm.org/pub/rpm/dist. */ 8 9 #include "system.h" 10 #include "findme.h" 11 #include <unistd.h> 12 13 const char * findProgramPath(const char * argv0) 14 { 15 char * path = getenv("PATH"); 16 char * pathbuf; 17 char * start, * chptr; 18 char * buf; 19 20 if (argv0 == NULL) return NULL; /* XXX can't happen */ 21 /* If there is a / in the argv[0], it has to be an absolute path */ 22 if (strchr(argv0, '/')) 23 return xstrdup(argv0); 24 25 if (path == NULL) return NULL; 26 27 start = pathbuf = alloca(strlen(path) + 1); 28 buf = malloc(strlen(path) + strlen(argv0) + sizeof("/")); 29 if (buf == NULL) return NULL; /* XXX can't happen */ 30 strcpy(pathbuf, path); 31 32 chptr = NULL; 33 /*@-branchstate@*/ 34 do { 35 if ((chptr = strchr(start, ':'))) 36 *chptr = '\0'; 37 sprintf(buf, "%s/%s", start, argv0); 38 39 if (!access(buf, X_OK)) 40 return buf; 41 42 if (chptr) 43 start = chptr + 1; 44 else 45 start = NULL; 46 } while (start && *start); 47 /*@=branchstate@*/ 48 49 free(buf); 50 51 return NULL; 52 } 53
