ubgpsuite/lonetix/strncatz.c

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2021-06-07 16:55:13 +02:00
// SPDX-License-Identifier: LGPL-3.0-or-later
/**
* \file strncatz.c
*
* Implements `Df_strncatz()`.
*
* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
* \author Lorenzo Cogotti
*/
// THIS CODE IS DERIVED FROM OpenBSD strlcat.c
// ORIGINAL LICENSE TERMS FOLLOW:
/* $OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $ */
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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.
*/
// ORIGINAL LICENSE TERMS END ***
#include "strlib.h"
#include <string.h>
size_t Df_strncatz(char *dst, const char *src, size_t n)
{
char *d = dst;
const char *s = src;
size_t left = n;
size_t dlen;
// Find the end of dst and adjust bytes left but don't go past end
while (left-- != 0 && *d != '\0') d++;
dlen = d - dst;
left = n - dlen;
if (left == 0)
return dlen + strlen(s);
while (*s != '\0') {
if (left != 1) {
*d++ = *s;
left--;
}
s++;
}
*d = '\0';
return dlen + (s - src); // count does not include NUL
}