1/* $OpenBSD: strlcpy.c,v 1.11 2006/05/05 15:27:38 millert Exp $ */ 2 3/* 4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19/* OPENBSD ORIGINAL: lib/libc/string/strlcpy.c */ 20 21/* clang-format off */ 22 23#include "openbsd-compat.h" 24 25#ifndef HAVE_STRLCPY 26 27#include <sys/types.h> 28#include <string.h> 29 30/* 31 * Copy src to string dst of size siz. At most siz-1 characters 32 * will be copied. Always NUL terminates (unless siz == 0). 33 * Returns strlen(src); if retval >= siz, truncation occurred. 34 */ 35size_t 36strlcpy(char *dst, const char *src, size_t siz) 37{ 38 char *d = dst; 39 const char *s = src; 40 size_t n = siz; 41 42 /* Copy as many bytes as will fit */ 43 if (n != 0) { 44 while (--n != 0) { 45 if ((*d++ = *s++) == '\0') 46 break; 47 } 48 } 49 50 /* Not enough room in dst, add NUL and traverse rest of src */ 51 if (n == 0) { 52 if (siz != 0) 53 *d = '\0'; /* NUL-terminate dst */ 54 while (*s++) 55 ; 56 } 57 58 return(s - src - 1); /* count does not include NUL */ 59} 60 61#endif /* !HAVE_STRLCPY */ 62/* clang-format on */ 63