/*	$OpenBSD: k_concat.c,v 1.2 1997/12/09 07:57:20 art Exp $	*/
/* $KTH: k_concat.c,v 1.5 1997/05/02 08:56:39 joda Exp $ */

/*
 * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * 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 Kungliga Tekniska
 *      Högskolan and its contributors.
 * 
 * 4. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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 "krb_locl.h"

int
k_concat (char *s, size_t len, ...)
{
    int ret;
    va_list args;

    va_start(args, len);
    ret = k_vconcat (s, len, args);
    va_end(args);
    return ret;
}

int
k_vconcat (char *s, size_t len, va_list args)
{
    const char *a;

    while ((a = va_arg(args, const char*))) {
	size_t n = strlen (a);

	if (n >= len)
	    return -1;
	strncpy (s, a, n);
	s += n;
	len -= n;
    }
    *s = '\0';
    return 0;
}

size_t
k_vmconcat (char **s, size_t max_len, va_list args)
{
    const char *a;
    char *p, *q;
    size_t len = 0;
    *s = NULL;
    p = malloc(1);
    if(p == NULL)
	return 0;
    *p = 0;
    len = 1;
    while ((a = va_arg(args, const char*))) {
	size_t n = strlen (a);
	
	if(max_len && len + n > max_len){
	    free(p);
	    p = NULL;
	    return 0;
	}
	q = realloc(p, len + n);
	if(q == NULL){
	    free(p);
	    p = NULL;
	    return 0;
	}
	p = q;
	len += n;
	strcat(p, a);
    }
    *s = p;
    return len;
}

size_t
k_mconcat (char **s, size_t max_len, ...)
{
    int ret;
    va_list args;

    va_start(args, max_len);
    ret = k_vmconcat (s, max_len, args);
    va_end(args);
    return ret;
}