strlcat.c
上传用户:awang829
上传日期:2019-07-14
资源大小:2356k
文件大小:2k
- /* $OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $ */
- /*
- * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
- * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- #if defined(LIBC_SCCS) && !defined(lint)
- static char *rcsid = "$OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $";
- #endif /* LIBC_SCCS and not lint */
- #include <sys/types.h>
- #include <string.h>
- /*
- * Appends src to string dst of size siz (unlike strncat, siz is the
- * full size of dst, not space left). At most siz-1 characters
- * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
- * Returns strlen(src) + MIN(siz, strlen(initial dst)).
- * If retval >= siz, truncation occurred.
- */
- size_t
- strlcat(char *dst, const char *src, size_t siz)
- {
- register char *d = dst;
- register const char *s = src;
- register size_t n = siz;
- size_t dlen;
- /* Find the end of dst and adjust bytes left but don't go past end */
- while (n-- != 0 && *d != ' ')
- d++;
- dlen = d - dst;
- n = siz - dlen;
- if (n == 0)
- return(dlen + strlen(s));
- while (*s != ' ') {
- if (n != 1) {
- *d++ = *s;
- n--;
- }
- s++;
- }
- *d = ' ';
- return(dlen + (s - src)); /* count does not include NUL */
- }