1 /* $NetBSD: strlcpy.c,v 1.2 2009/06/30 02:44:52 agc 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 #include "compat.h" 21 22 #include <sys/types.h> 23 #include <assert.h> 24 #include <string.h> 25 26 27 #if !HAVE_STRLCPY 28 /* 29 * Copy src to string dst of size siz. At most siz-1 characters 30 * will be copied. Always NUL terminates (unless siz == 0). 31 * Returns strlen(src); if retval >= siz, truncation occurred. 32 */ 33 size_t 34 #ifdef _LIBC 35 _strlcpy(dst, src, siz) 36 #else 37 strlcpy(dst, src, siz) 38 #endif 39 char *dst; 40 const char *src; 41 size_t siz; 42 { 43 char *d = dst; 44 const char *s = src; 45 size_t n = siz; 46 47 _DIAGASSERT(dst != NULL); 48 _DIAGASSERT(src != NULL); 49 50 /* Copy as many bytes as will fit */ 51 if (n != 0 && --n != 0) { 52 do { 53 if ((*d++ = *s++) == 0) 54 break; 55 } while (--n != 0); 56 } 57 58 /* Not enough room in dst, add NUL and traverse rest of src */ 59 if (n == 0) { 60 if (siz != 0) 61 *d = '\0'; /* NUL-terminate dst */ 62 while (*s++) 63 ; 64 } 65 66 return(s - src - 1); /* count does not include NUL */ 67 } 68 #endif 69