strlcpy.c revision 1.1
1/* $NetBSD: strlcpy.c,v 1.1 2005/12/20 19:28:52 christos Exp $ */ 2/* $OpenBSD: strlcpy.c,v 1.7 2003/04/12 21:56:39 millert Exp $ */ 3 4/* 5 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL 12 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 13 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE 14 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 16 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 17 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20#if !defined(_KERNEL) && !defined(_STANDALONE) 21#if HAVE_NBTOOL_CONFIG_H 22#include "nbtool_config.h" 23#endif 24 25#include <sys/cdefs.h> 26#if defined(LIBC_SCCS) && !defined(lint) 27__RCSID("$NetBSD: strlcpy.c,v 1.1 2005/12/20 19:28:52 christos Exp $"); 28#endif /* LIBC_SCCS and not lint */ 29 30#ifdef _LIBC 31#include "namespace.h" 32#endif 33#include <sys/types.h> 34#include <assert.h> 35#include <string.h> 36 37#ifdef _LIBC 38# ifdef __weak_alias 39__weak_alias(strlcpy, _strlcpy) 40# endif 41#endif 42#else 43#include <lib/libkern/libkern.h> 44#endif /* !_KERNEL && !_STANDALONE */ 45 46 47#if !HAVE_STRLCPY 48/* 49 * Copy src to string dst of size siz. At most siz-1 characters 50 * will be copied. Always NUL terminates (unless siz == 0). 51 * Returns strlen(src); if retval >= siz, truncation occurred. 52 */ 53size_t 54#ifdef _LIBC 55_strlcpy(dst, src, siz) 56#else 57strlcpy(dst, src, siz) 58#endif 59 char *dst; 60 const char *src; 61 size_t siz; 62{ 63 char *d = dst; 64 const char *s = src; 65 size_t n = siz; 66 67 _DIAGASSERT(dst != NULL); 68 _DIAGASSERT(src != NULL); 69 70 /* Copy as many bytes as will fit */ 71 if (n != 0 && --n != 0) { 72 do { 73 if ((*d++ = *s++) == 0) 74 break; 75 } while (--n != 0); 76 } 77 78 /* Not enough room in dst, add NUL and traverse rest of src */ 79 if (n == 0) { 80 if (siz != 0) 81 *d = '\0'; /* NUL-terminate dst */ 82 while (*s++) 83 ; 84 } 85 86 return(s - src - 1); /* count does not include NUL */ 87} 88#endif 89