newlib/libc/argz/envz_merge.c

   1 /* Copyright (C) 2002 by  Red Hat, Incorporated. All rights reserved.
   2  *
   3  * Permission to use, copy, modify, and distribute this software
   4  * is freely granted, provided that this notice is preserved.
   5  */
   6
   7 #include <errno.h>
   8 #include <sys/types.h>
   9 #include <string.h>
  10 #include <stdlib.h>
  11 #include <argz.h>
  12 #include <envz.h>
  13
  14 error_t
  15 envz_merge (char **envz,
  16        size_t *envz_len,
  17        const char *envz2,
  18        size_t envz2_len,
  19        int override)
  20 {
  21   char *entry = NULL;
  22   char *name_str = NULL;
  23   char *val_str = NULL;
  24   char *name_iter = NULL;
  25   int retval = 0;
  26
  27   while((entry = argz_next((char *)envz2, envz2_len, entry)) && !retval)
  28     {
  29       if (!override)
  30         {
  31           name_str = strdup (entry);
  32           name_iter = strchr(name_str, '=');
  33           if(name_iter)
  34             *name_iter = '\0';
  35
  36           if(!envz_entry(*envz, *envz_len, name_str))
  37             {
  38               retval = argz_add(envz, envz_len, entry);
  39             }
  40           free(name_str);
  41         }
  42       else
  43         {
  44           name_str = strdup (entry);
  45           name_iter = strchr(name_str, '=');
  46           if(name_iter)
  47             {
  48               *name_iter = '\0';
  49               val_str = name_iter + 1;
  50             }
  51           else
  52             {
  53               val_str = NULL;
  54             }
  55
  56           retval = envz_add(envz, envz_len, name_str, val_str);
  57           free(name_str);
  58         }
  59     }
  60   return retval;
  61 }