1 /* $OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 millert Exp $ */ 2 3 /* 4 * Copyright (c) 1998, 2015 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 #include <config.h> 20 21 #include <stddef.h> 22 #include <string.h> 23 24 #include "portability.h" 25 26 /* 27 * Copy string src to buffer dst of size dsize. At most dsize-1 28 * chars will be copied. Always NUL terminates (unless dsize == 0). 29 * Returns strlen(src); if retval >= dsize, truncation occurred. 30 */ 31 size_t 32 pcapint_strlcpy(char * restrict dst, const char * restrict src, size_t dsize) 33 { 34 const char *osrc = src; 35 size_t nleft = dsize; 36 37 /* Copy as many bytes as will fit. */ 38 if (nleft != 0) { 39 while (--nleft != 0) { 40 if ((*dst++ = *src++) == '\0') 41 break; 42 } 43 } 44 45 /* Not enough room in dst, add NUL and traverse rest of src. */ 46 if (nleft == 0) { 47 if (dsize != 0) 48 *dst = '\0'; /* NUL-terminate dst */ 49 while (*src++) 50 ; 51 } 52 53 return(src - osrc - 1); /* count does not include NUL */ 54 } 55