src/findme.c

   1 /* (C) 1998 Red Hat Software, Inc. -- Licensing details are in the COPYING
   2    file accompanying popt source distributions, available from
   3    ftp://ftp.redhat.com/pub/code/popt */
   4
   5 #ifdef HAVE_CONFIG_H
   6 #include "config.h"
   7 #endif
   8
   9 #include "poptalloca.h"
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #ifdef HAVE_UNISTD_H
  14 #  include <unistd.h>
  15 #endif
  16 #ifdef __NeXT
  17 /* access macros are not declared in non posix mode in unistd.h -
  18  don't try to use posix on NeXTstep 3.3 ! */
  19 #include <libc.h>
  20 #endif
  21
  22 #include "findme.h"
  23
  24 const char * findProgramPath(const char * argv0) {
  25     char * path = getenv("PATH");
  26     char * pathbuf;
  27     char * start, * chptr;
  28     char * buf;
  29
  30     /* If there is a / in the argv[0], it has to be an absolute
  31        path */
  32     if (strchr(argv0, '/'))
  33         return strdup(argv0);
  34
  35     if (!path) return NULL;
  36
  37     start = pathbuf = alloca(strlen(path) + 1);
  38     buf = malloc(strlen(path) + strlen(argv0) + 2);
  39     strcpy(pathbuf, path);
  40
  41     chptr = NULL;
  42     do {
  43         if ((chptr = strchr(start, ':')))
  44             *chptr = '\0';
  45         sprintf(buf, "%s/%s", start, argv0);
  46
  47         if (!access(buf, X_OK))
  48             return buf;
  49
  50         if (chptr)
  51             start = chptr + 1;
  52         else
  53             start = NULL;
  54     } while (start && *start);
  55
  56     free(buf);
  57
  58     return NULL;
  59 }