toolchain/gcc/newlib/libc/argz/envz_entry.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 _DEFUN (envz_entry, (envz, envz_len, name),
  17        const char *envz _AND
  18        size_t envz_len _AND
  19        const char *name)
  20 {
  21   char *buf_ptr = (char *)envz;
  22   size_t buf_len = envz_len;
  23
  24   while(buf_len)
  25     {
  26       if (_buf_findstr(name, &buf_ptr, &buf_len))
  27         {
  28           if (buf_ptr)
  29             {
  30               if (*buf_ptr == '=' || *buf_ptr == '\0')
  31                 {
  32                   buf_ptr--;
  33
  34                   /* Move buf_ptr back to start of entry. */
  35                   while(*buf_ptr != '\0' && buf_ptr != envz) buf_ptr--;
  36
  37                   if(*buf_ptr == '\0')
  38                     buf_ptr++;
  39
  40                   return (char *)buf_ptr;
  41                 }
  42             }
  43         }
  44     }
  45   return 0;
  46 }