1 /* $OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $ */ 2 3 /* 4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 /* OPENBSD ORIGINAL: lib/libc/string/strlcpy.c */ 20 #include "file.h" 21 #ifndef lint 22 FILE_RCSID("@(#)$File: strlcpy.c,v 1.3 2022/09/13 18:46:07 christos Exp $") 23 #endif 24 25 #include <sys/types.h> 26 #include <string.h> 27 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 strlcpy(char *dst, const char *src, size_t siz) 35 { 36 char *d = dst; 37 const char *s = src; 38 size_t n = siz; 39 40 /* Copy as many bytes as will fit */ 41 if (n != 0 && --n != 0) { 42 do { 43 if ((*d++ = *s++) == 0) 44 break; 45 } while (--n != 0); 46 } 47 48 /* Not enough room in dst, add NUL and traverse rest of src */ 49 if (n == 0) { 50 if (siz != 0) 51 *d = '\0'; /* NUL-terminate dst */ 52 while (*s++) 53 ; 54 } 55 56 return(s - src - 1); /* count does not include NUL */ 57 } 58