/*    $OpenBSD: strlcat.c,v 1.19 2019/01/25 00:19:25 millert Exp $    */
/*    $OpenBSD: strlcpy.c,v 1.16 2019/01/25 00:19:25 millert Exp $    */

/*
 * Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <string.h>


size_t
strlcat(char *dst, const char *src, size_t dsize)
{
    const char *odst = dst;
    const char *osrc = src;
    size_t n = dsize;
    size_t dlen;

    if(!dst || !src)
        return 0;
    if(n == 0)
        return 0;
    while(n-- != 0 && *dst != '\0')
        dst++;
    dlen = dst - odst;
    n = dsize - dlen;

    if(n-- == 0)
        return (dlen + strlen(src));
    while(*src != '\0') {
        if(n != 0) {
            *dst++ = *src;
            n--;
        }
        src++;
    }
    *dst = '\0';

    return(dlen + (src - osrc));
}


size_t
strlcpy(char *dst, const char *src, size_t dsize)
{
    const char *osrc = src;
    size_t nleft = dsize;

    if(!dst || !src)
        return 0;
    if(nleft == 0)
        return 0;
    while(--nleft != 0) {
        if((*dst++ = *src++) == '\0')
            break;
    }

    if(nleft == 0) {
        *dst = '\0';
        while(*src++);
    }

    return(src - osrc - 1);
}


