libc/stdlib/getenv.c

   1 /* getenv.c for uClibc
   2  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
   3  *
   4  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   5  */
   6
   7 #include <string.h>
   8 #include <unistd.h>
   9 #include <stdlib.h>
  10
  11
  12 /* IEEE Std 1003.1-2001 says getenv need not be thread safe, so
  13  * don't bother locking access to __environ */
  14 char *getenv(const char *var)
  15 {
  16     int len;
  17     char **ep;
  18
  19     if (!(ep=__environ))
  20         return NULL;
  21     len = strlen(var);
  22     while(*ep) {
  23         if (memcmp(var, *ep, len) == 0 && (*ep)[len] == '=') {
  24             return *ep + len + 1;
  25         }
  26         ep++;
  27     }
  28     return NULL;
  29 }
  30 libc_hidden_weak(getenv)