1 /* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */ 2 3 /* $OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $ */ 4 5 /* 6 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21 #include "includes.h" 22 #ifndef HAVE_STRLCAT 23 24 #if defined(LIBC_SCCS) && !defined(lint) 25 static char *rcsid = "$OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $"; 26 #endif /* LIBC_SCCS and not lint */ 27 28 #include <sys/types.h> 29 #include <string.h> 30 31 /* 32 * Appends src to string dst of size siz (unlike strncat, siz is the 33 * full size of dst, not space left). At most siz-1 characters 34 * will be copied. Always NUL terminates (unless siz <= strlen(dst)). 35 * Returns strlen(src) + MIN(siz, strlen(initial dst)). 36 * If retval >= siz, truncation occurred. 37 */ 38 size_t 39 strlcat(char *dst, const char *src, size_t siz) 40 { 41 register char *d = dst; 42 register const char *s = src; 43 register size_t n = siz; 44 size_t dlen; 45 46 /* Find the end of dst and adjust bytes left but don't go past end */ 47 while (n-- != 0 && *d != '\0') 48 d++; 49 dlen = d - dst; 50 n = siz - dlen; 51 52 if (n == 0) 53 return(dlen + strlen(s)); 54 while (*s != '\0') { 55 if (n != 1) { 56 *d++ = *s; 57 n--; 58 } 59 s++; 60 } 61 *d = '\0'; 62 63 return(dlen + (s - src)); /* count does not include NUL */ 64 } 65 66 #endif /* !HAVE_STRLCAT */ 67