popt/findme.c

   1 /** \ingroup popt
   2  * \file popt/findme.c
   3  */
   4
   5 /* (C) 1998-2000 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
  12 const char * findProgramPath(const char * argv0) {
  13     char * path = getenv("PATH");
  14     char * pathbuf;
  15     char * start, * chptr;
  16     char * buf;
  17
  18     if (argv0 == NULL) return NULL;     /* XXX can't happen */
  19     /* If there is a / in the argv[0], it has to be an absolute path */
  20     if (strchr(argv0, '/'))
  21         return xstrdup(argv0);
  22
  23     if (path == NULL) return NULL;
  24
  25     start = pathbuf = alloca(strlen(path) + 1);
  26     buf = malloc(strlen(path) + strlen(argv0) + sizeof("/"));
  27     if (buf == NULL) return NULL;       /* XXX can't happen */
  28     strcpy(pathbuf, path);
  29
  30     chptr = NULL;
  31     /*@-branchstate@*/
  32     do {
  33         if ((chptr = strchr(start, ':')))
  34             *chptr = '\0';
  35         sprintf(buf, "%s/%s", start, argv0);
  36
  37         if (!access(buf, X_OK))
  38             return buf;
  39
  40         if (chptr)
  41             start = chptr + 1;
  42         else
  43             start = NULL;
  44     } while (start && *start);
  45     /*@=branchstate@*/
  46
  47     free(buf);
  48
  49     return NULL;
  50 }