lib/libc/compat/stdlib/compat_putenv.c

   1 /*      $NetBSD: compat_putenv.c,v 1.2 2012/04/22 15:55:41 christos Exp $       */
   2
   3 /*-
   4  * Copyright (c) 2012 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Christos Zoulas.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 #include <sys/cdefs.h>
  32 #if defined(LIBC_SCCS) && !defined(lint)
  33 __RCSID("$NetBSD: compat_putenv.c,v 1.2 2012/04/22 15:55:41 christos Exp $");
  34 #endif /* LIBC_SCCS and not lint */
  35
  36 #define __LIBC12_SOURCE__
  37 #include "namespace.h"
  38
  39 #include <assert.h>
  40 #include <errno.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <compat/include/stdlib.h>
  44
  45 #include "env.h"
  46 #include "reentrant.h"
  47 #include "local.h"
  48
  49 #ifdef __weak_alias
  50 __weak_alias(putenv,_putenv)
  51 #endif
  52
  53 __warn_references(putenv,
  54     "warning: reference to compatibility putenv();"
  55     " include <stdlib.h> for correct reference")
  56
  57 /*
  58  * putenv(name) --
  59  *      This version implicitly copies the string for compatibility.
  60  */
  61 int
  62 putenv(char *name)
  63 {
  64         size_t l_name;
  65         char *copy;
  66         int rv;
  67
  68         _DIAGASSERT(name != NULL);
  69
  70         l_name = __envvarnamelen(name, true);
  71         if (l_name == 0) {
  72                 errno = EINVAL;
  73                 return -1;
  74         }
  75
  76         if ((copy = strdup(name)) == NULL)
  77                 return -1;
  78         copy[l_name++] = '\0';
  79
  80         rv = setenv(copy, copy + l_name, 1);
  81
  82         free(copy);
  83         return rv;
  84 }