Libc-1244.50.9.tar.gz

[apple/libc.git] / stdlib / FreeBSD / putenv.c

/*-
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)putenv.c	8.2 (Berkeley) 3/27/94";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/stdlib/putenv.c,v 1.6 2007/05/01 16:02:41 ache Exp $");

#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <db.h>
#include <crt_externs.h>
#include <errno.h> 

extern struct owned_ptr *__env_owned;

#ifdef LEGACY_CRT1_ENVIRON
extern char **_saved_environ;
#endif /* LEGACY_CRT1_ENVIRON */

__private_extern__ int __init__env_owned_locked(int);
__private_extern__ int __setenv_locked(const char *, const char *, int, int, char ***, struct owned_ptr *);
__private_extern__ void __environ_lock(void);
__private_extern__ void __environ_unlock(void);

#ifndef BUILDING_VARIANT
/*
 * _putenvp -- SPI using an arbitrary pointer to string array (the array must
 * have been created with malloc) and an env state, created by _allocenvstate().
 *	Returns ptr to value associated with name, if any, else NULL.
 */
int
_putenvp(char *str, char ***envp, void *state)
{
	__environ_lock();
	if (__init__env_owned_locked(1)) {
		__environ_unlock();
		return (-1);
	}
	int ret = __setenv_locked(str, NULL, 1, 0, envp,
			(state ? (struct owned_ptr *)state : __env_owned));
	__environ_unlock();
	return ret;
}
#endif /* BUILDING_VARIANT */

int
putenv(str)
	char *str;
{
	int ret;
	int copy;

#if __DARWIN_UNIX03
	if (str == NULL || *str == 0 || index(str, '=') == NULL) {
		errno = EINVAL;
		return (-1);
	}
#else /* !__DARWIN_UNIX03 */
	if (index(str, '=') == NULL)
		return (-1);
#endif /* __DARWIN_UNIX03 */

#if __DARWIN_UNIX03
	copy = 0;
#else /* !__DARWIN_UNIX03 */
	copy = -1;
#endif /* __DARWIN_UNIX03 */

	__environ_lock();
	if (__init__env_owned_locked(1)) {
		__environ_unlock();
		return (-1);
	}
	ret = __setenv_locked(str, NULL, 1, copy, _NSGetEnviron(), __env_owned);
#ifdef LEGACY_CRT1_ENVIRON
	_saved_environ = *_NSGetEnviron();
#endif /* LEGACY_CRT1_ENVIRON */
	__environ_unlock();
	return ret;
}