newlib/libc/argz/envz_strip.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 void
  15 envz_strip (char **envz,
  16        size_t *envz_len)
  17 {
  18   char *entry = 0;
  19   int len = 0;
  20   int null_found = 0;
  21
  22   while((entry = argz_next(*envz, *envz_len, entry)))
  23     {
  24       if(!strchr(entry, '='))
  25         {
  26           null_found = 1;
  27           len = strlen(entry) + 1;
  28           /* Make sure this is not the last entry in envz. If it is, it
  29            will be chopped off by the realloc anyway.*/
  30           if(*envz + *envz_len != entry + len - 1)
  31             {
  32               memmove(entry, entry + len, *envz + *envz_len - entry - len);
  33             }
  34           *envz_len -= len;
  35         }
  36     }
  37   if(null_found)
  38     {
  39       *envz = (char *)realloc(*envz, *envz_len);
  40     }
  41 }