1236769Sobrien/* $NetBSD: strlcpy.c,v 1.3 2007/06/04 18:19:27 christos Exp $ */ 2236769Sobrien/* $OpenBSD: strlcpy.c,v 1.7 2003/04/12 21:56:39 millert Exp $ */ 3236769Sobrien 4236769Sobrien/* 5236769Sobrien * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 6236769Sobrien * 7236769Sobrien * Permission to use, copy, modify, and distribute this software for any 8236769Sobrien * purpose with or without fee is hereby granted, provided that the above 9236769Sobrien * copyright notice and this permission notice appear in all copies. 10236769Sobrien * 11236769Sobrien * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL 12236769Sobrien * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 13236769Sobrien * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE 14236769Sobrien * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15236769Sobrien * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 16236769Sobrien * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 17236769Sobrien * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18236769Sobrien */ 19236769Sobrien 20236769Sobrien#ifdef HAVE_CONFIG_H 21236769Sobrien# include <config.h> 22236769Sobrien#endif 23236769Sobrien#ifndef HAVE_STRLCPY 24236769Sobrien 25236769Sobrien#include <sys/cdefs.h> 26236769Sobrien 27236769Sobrien#include <sys/types.h> 28236769Sobrien#include <string.h> 29236769Sobrien 30236769Sobrien/* 31236769Sobrien * Copy src to string dst of size siz. At most siz-1 characters 32236769Sobrien * will be copied. Always NUL terminates (unless siz == 0). 33236769Sobrien * Returns strlen(src); if retval >= siz, truncation occurred. 34236769Sobrien */ 35236769Sobriensize_t 36236769Sobrienstrlcpy(char *dst, const char *src, size_t siz) 37236769Sobrien{ 38236769Sobrien char *d = dst; 39236769Sobrien const char *s = src; 40236769Sobrien size_t n = siz; 41236769Sobrien 42236769Sobrien if (!dst || !src) 43236769Sobrien return 0; 44236769Sobrien 45236769Sobrien /* Copy as many bytes as will fit */ 46236769Sobrien if (n != 0 && --n != 0) { 47236769Sobrien do { 48236769Sobrien if ((*d++ = *s++) == 0) 49236769Sobrien break; 50236769Sobrien } while (--n != 0); 51236769Sobrien } 52236769Sobrien 53236769Sobrien /* Not enough room in dst, add NUL and traverse rest of src */ 54236769Sobrien if (n == 0) { 55236769Sobrien if (siz != 0) 56236769Sobrien *d = '\0'; /* NUL-terminate dst */ 57236769Sobrien while (*s++) 58236769Sobrien ; 59236769Sobrien } 60236769Sobrien 61236769Sobrien return(s - src - 1); /* count does not include NUL */ 62236769Sobrien} 63236769Sobrien#endif 64