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68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/* $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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/**
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* @file strlcpy.c
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* @author Todd C. Miller
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* @date 1998, 2015
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* @copyright ISC License
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*/
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#include <sys/types.h>
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#include <string.h>
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#ifndef strlcpy
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/**
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* Safe version of strncpy() from OpenBSD
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* @param dst Destination string
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* @param src Source string
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* @param dsize Total maximum size of @p dst
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*
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* This function copies string @p src to buffer @p dst of size @p dsize
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* bytes. At most dsize-1 chars will be copied. Always NUL terminates
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* (unless dsize==0).
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*
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* @returns strlen(src); if retval >= dsize, truncation occurred.
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*/
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size_t
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strlcpy(char *dst, const char *src, size_t dsize)
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{
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const char *osrc = src;
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size_t nleft = dsize;
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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 (dsize != 0)
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*dst = '\0'; /* NUL-terminate dst */
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while (*src++)
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;
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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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#endif
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