adtools/clib2

/*
 * $Id: unistd_execle.c,v 1.3 2006-08-02 06:49:47 obarthel Exp $
 *
 * :ts=4
 *
 * Portable ISO 'C' (1994) runtime library for the Amiga computer
 * Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Neither the name of Olaf Barthel nor the names of contributors
 *     may be used to endorse or promote products derived from this
 *     software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
 */

#ifndef _UNISTD_HEADERS_H
#include "unistd_headers.h"
#endif /* _UNISTD_HEADERS_H */

/****************************************************************************/

/* The following is not part of the ISO 'C' (1994) standard. */

/****************************************************************************/

int
execle(const char *path, const char *arg0, ...)
{
    char ** argv = NULL;
    int result = -1;
    size_t argc = 0;
    va_list args;
    char **envp;

    /* If there are any, count the number of arguments supplied */
    if(arg0 != NULL)
    {
        argc = 1;

        va_start(args,arg0);

        while(va_arg(args,const char *) != NULL)
            argc++;

        va_end(args);
    }

    /* Allocate enough memory for the entire argument list
       plus the terminating NULL */
    argv = (char **)malloc(sizeof(*argv) * (argc + 1));
    if(argv == NULL)
    {
        __set_errno(ENOMEM);
        goto out;
    }

    va_start(args,arg0);

    if(argc > 0)
    {
        size_t i;

        argv[0] = (char *)arg0;

        for(i = 1 ; i < argc ; i++)
            argv[i] = va_arg(args,char *);

        /* Skip the NULL terminator */
        (void)va_arg(args, char **);
    }

    envp = va_arg(args, char **);

    va_end(args);

    argv[argc] = NULL;

    result = execve(path,(char * const *)argv, envp );

 out:

    if(argv != NULL)
        free(argv);

    return(result);
}