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60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
// SPDX-License-Identifier: LGPL-3.0-or-later
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/**
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* \file strncpyz.c
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*
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* Implements `Df_strncpyz()`.
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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 strlcpy.c
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// ORIGINAL LICENSE TERMS FOLLOW:
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/* $OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 millert Exp $ */
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/*
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* Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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// ORIGINAL LICENSE TERMS END ***
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#include "strlib.h"
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size_t Df_strncpyz(char *dst, const char *src, size_t n)
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{
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const char *osrc = src;
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size_t nleft = n;
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// Copy as many bytes as will fit
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if (nleft > 0) {
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while (--nleft != 0) {
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if ((*dst++ = *src++) == '\0')
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break;
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}
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}
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// Not enough room in dst, add NUL and traverse rest of src
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if (nleft == 0) {
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if (n > 0)
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*dst = '\0'; // NUL-terminate dst
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while (*src++ != '\0');
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}
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return src - osrc - 1; // count does not include NUL
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}
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