/*-
 * Copyright (c) 1996
 *	David Parsons.  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 David Parsons
 *      (orc@pell.chi.il.us)
 * 4. My name may not 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.
 */
static char rcsid[] = "$Header: /home/orc/src/CVS/listmgr/addarg.c,v 1.4 1996/04/23 03:32:23 orc Exp $";
/*
 * addarg() adds an argument to an arglist
 */
#include <string.h>
#include <malloc.h>

int
addarg(int *argc, char ***argv, char *arg, int arglen)
{
#define ARGC	(*argc)
#define ARGV	(*argv)

    if ((ARGV = realloc(ARGV, (1+ARGC) * sizeof *ARGV)) == 0)
	return -1;
    if (arg == 0)
	ARGV[ARGC] = 0;
    else {
	if (arglen < 0)
	    ARGV[ARGC] = strdup(arg);
	else if ((ARGV[ARGC] = malloc(arglen+1)) != 0) {
	    strncpy(ARGV[ARGC], arg, arglen);
	    ARGV[ARGC][arglen] = 0;
	}
	if (ARGV[ARGC] == 0)
	    return -1;
    }
    return ++ARGC;
} /* addarg */