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