1 /* $NetBSD: strlcpy.c,v 1.3 2007/06/04 18:19:27 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 (at) 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 #include <LibConfig.h> 20 21 #if !defined(_KERNEL) && !defined(_STANDALONE) 22 #if HAVE_NBTOOL_CONFIG_H 23 #include "nbtool_config.h" 24 #endif 25 26 #include <sys/cdefs.h> 27 #if defined(LIBC_SCCS) && !defined(lint) 28 __RCSID("$NetBSD: strlcpy.c,v 1.3 2007/06/04 18:19:27 christos Exp $"); 29 #endif /* LIBC_SCCS and not lint */ 30 31 #ifdef _LIBC 32 #include "namespace.h" 33 #endif 34 #include <sys/types.h> 35 #include <assert.h> 36 #include <string.h> 37 38 #ifdef _LIBC 39 # ifdef __weak_alias 40 __weak_alias(strlcpy, _strlcpy) 41 # endif 42 #endif 43 #else 44 #include <lib/libkern/libkern.h> 45 #endif /* !_KERNEL && !_STANDALONE */ 46 47 48 #if !HAVE_STRLCPY 49 /* 50 * Copy src to string dst of size siz. At most siz-1 characters 51 * will be copied. Always NUL terminates (unless siz == 0). 52 * Returns strlen(src); if retval >= siz, truncation occurred. 53 */ 54 size_t 55 strlcpy(char *dst, const char *src, size_t siz) 56 { 57 char *d = dst; 58 const char *s = src; 59 size_t n = siz; 60 61 _DIAGASSERT(dst != NULL); 62 _DIAGASSERT(src != NULL); 63 64 /* Copy as many bytes as will fit */ 65 if (n != 0 && --n != 0) { 66 do { 67 if ((*d++ = *s++) == 0) 68 break; 69 } while (--n != 0); 70 } 71 72 /* Not enough room in dst, add NUL and traverse rest of src */ 73 if (n == 0) { 74 if (siz != 0) 75 *d = '\0'; /* NUL-terminate dst */ 76 while (*s++) 77 ; 78 } 79 80 return(s - src - 1); /* count does not include NUL */ 81 } 82 #endif 83
