1 /* $NetBSD: strlcpy.c,v 1.2 2015/01/22 03:48:07 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_CONFIG_H 22 #include "config.h" 23 #endif 24 25 #include <sys/cdefs.h> 26 #if defined(LIBC_SCCS) && !defined(lint) 27 __RCSID("$NetBSD: strlcpy.c,v 1.2 2015/01/22 03:48:07 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 */ 53 size_t 54 strlcpy(char *dst, const char *src, size_t siz) 55 { 56 char *d = dst; 57 const char *s = src; 58 size_t n = siz; 59 60 /* Copy as many bytes as will fit */ 61 if (n != 0 && --n != 0) { 62 do { 63 if ((*d++ = *s++) == 0) 64 break; 65 } while (--n != 0); 66 } 67 68 /* Not enough room in dst, add NUL and traverse rest of src */ 69 if (n == 0) { 70 if (siz != 0) 71 *d = '\0'; /* NUL-terminate dst */ 72 while (*s++) 73 ; 74 } 75 76 return(s - src - 1); /* count does not include NUL */ 77 } 78 #endif 79