1 /* $OpenBSD: wcslcat.c,v 1.4 2011/07/24 15:21:28 millert Exp $ */ 2 /* $NetBSD: wcslcat.c,v 1.2 2001/01/03 14:33:02 lukem 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 THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/types.h> 21 #include <wchar.h> 22 23 /* 24 * Appends src to string dst of size siz (unlike wcsncat, siz is the 25 * full size of dst, not space left). At most siz-1 characters 26 * will be copied. Always NUL terminates (unless siz <= wcslen(dst)). 27 * Returns wcslen(src) + MIN(siz, wcslen(initial dst)). 28 * If retval >= siz, truncation occurred. 29 */ 30 size_t 31 wcslcat(wchar_t *dst, const wchar_t *src, size_t siz) 32 { 33 wchar_t *d = dst; 34 const wchar_t *s = src; 35 size_t n = siz; 36 size_t dlen; 37 38 /* Find the end of dst and adjust bytes left but don't go past end */ 39 while (n-- != 0 && *d != '\0') 40 d++; 41 dlen = d - dst; 42 n = siz - dlen; 43 44 if (n == 0) 45 return(dlen + wcslen(s)); 46 while (*s != '\0') { 47 if (n != 1) { 48 *d++ = *s; 49 n--; 50 } 51 s++; 52 } 53 *d = '\0'; 54 55 return(dlen + (s - src)); /* count does not include NUL */ 56 } 57