newlib/libc/argz/envz_get.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 <envz.h>
  12
  13 #include "buf_findstr.h"
  14
  15 char *
  16 envz_get (const char *envz,
  17        size_t envz_len,
  18        const char *name)
  19 {
  20   char *buf_ptr = (char *)envz;
  21   size_t buf_len = envz_len;
  22
  23   while(buf_len)
  24     {
  25       if (_buf_findstr(name, &buf_ptr, &buf_len))
  26         {
  27           if (*buf_ptr == '=')
  28             {
  29               buf_ptr++;
  30               return (char *)buf_ptr;
  31             }
  32           else
  33             {
  34               if (*buf_ptr == '\0')
  35                 /* NULL entry. */
  36                 return NULL;
  37             }
  38         }
  39     }
  40   /* No matching entries found. */
  41   return NULL;
  42 }