NetBSD/lib/libc/gen/execle.c

/*	$NetBSD: execle.c,v 1.6 2000/01/22 22:19:09 mycroft Exp $	*/

/*-
 * Copyright (c) 1991, 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)exec.c	8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: execle.c,v 1.6 2000/01/22 22:19:09 mycroft Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"
#include <stdlib.h>
#include <unistd.h>

#if __STDC__
#include <stdarg.h>
#define VA_START(ap, last)	va_start(ap, last)
#else
#include <varargs.h>
#define VA_START(ap, last)	va_start(ap)
#endif

#ifdef __weak_alias
__weak_alias(execle,_execle)
#endif

int
#if __STDC__
execle(const char *name, const char *arg, ...)
#else
execle(name, arg, va_alist)
	const char *name;
	const char *arg;
	va_dcl
#endif
{
#if defined(__i386__) || defined(__m68k__) || defined(__ns32k__)
	va_list ap;
	char **envp;

	VA_START(ap, arg);
	while ((va_arg(ap, char *)) != NULL)
		;
	envp = va_arg(ap, char **);
	va_end(ap);

	return execve(name, (char **) &arg, envp);
#else
	va_list ap;
	char **argv, **envp;
	int i;

	VA_START(ap, arg);
	for (i = 2; va_arg(ap, char *) != NULL; i++)
		;
	va_end(ap);

	argv = alloca (i * sizeof (char *));
	
	VA_START(ap, arg);
	argv[0] = (char *) arg;
	for (i = 1; (argv[i] = (char *) va_arg(ap, char *)) != NULL; i++) 
		;
	envp = (char **) va_arg(ap, char **);
	va_end(ap);

	return execve(name, argv, envp);
#endif
}