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compat_putenv.c revision 1.2 
      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 }
     85