1 /* compat/strlcat.c */ 2 3 /*- 4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 /* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */ 31 32 #include "config.h" 33 #ifndef HAVE_STRLCAT 34 35 #include <sys/types.h> 36 #include <string.h> 37 38 /* 39 * Appends src to string dst of size siz (unlike strncat, siz is the 40 * full size of dst, not space left). At most siz-1 characters 41 * will be copied. Always NUL terminates (unless siz <= strlen(dst)). 42 * Returns strlen(src) + MIN(siz, strlen(initial dst)). 43 * If retval >= siz, truncation occurred. 44 */ 45 size_t 46 strlcat(char *dst, const char *src, size_t siz) 47 { 48 char *d = dst; 49 const char *s = src; 50 size_t n = siz; 51 size_t dlen; 52 53 /* Find the end of dst and adjust bytes left but don't go past end */ 54 while (n-- != 0 && *d != '\0') 55 d++; 56 dlen = d - dst; 57 n = siz - dlen; 58 59 if (n == 0) 60 return(dlen + strlen(s)); 61 while (*s != '\0') { 62 if (n != 1) { 63 *d++ = *s; 64 n--; 65 } 66 s++; 67 } 68 *d = '\0'; 69 70 return(dlen + (s - src)); /* count does not include NUL */ 71 } 72 73 #endif /* !HAVE_STRLCAT */ 74