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82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
4 years ago
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// SPDX-License-Identifier: LGPL-3.0-or-later
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/**
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* \file strncatz.c
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*
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* Implements `Df_strncatz()`.
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*
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* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
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* \author Lorenzo Cogotti
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*/
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// THIS CODE IS DERIVED FROM OpenBSD strlcat.c
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// ORIGINAL LICENSE TERMS FOLLOW:
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/* $OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// ORIGINAL LICENSE TERMS END ***
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#include "strlib.h"
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#include <string.h>
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size_t Df_strncatz(char *dst, const char *src, size_t n)
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{
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char *d = dst;
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const char *s = src;
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size_t left = n;
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size_t dlen;
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// Find the end of dst and adjust bytes left but don't go past end
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while (left-- != 0 && *d != '\0') d++;
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dlen = d - dst;
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left = n - dlen;
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if (left == 0)
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return dlen + strlen(s);
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while (*s != '\0') {
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if (left != 1) {
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*d++ = *s;
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left--;
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}
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s++;
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}
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*d = '\0';
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return dlen + (s - src); // count does not include NUL
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}
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