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# missing/strlcat.c

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    00001 /*      $OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $     */
    00002
    00003 /*
    00004  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
    00005  * All rights reserved.
    00006  *
    00007  * Redistribution and use in source and binary forms, with or without
    00008  * modification, are permitted provided that the following conditions
    00009  * are met:
    00010  * 1. Redistributions of source code must retain the above copyright
    00011  *    notice, this list of conditions and the following disclaimer.
    00012  * 2. Redistributions in binary form must reproduce the above copyright
    00013  *    notice, this list of conditions and the following disclaimer in the
    00014  *    documentation and/or other materials provided with the distribution.
    00015  * 3. The name of the author may not be used to endorse or promote products
    00016  *    derived from this software without specific prior written permission.
    00017  *
    00018  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
    00019  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
    00020  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
    00021  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
    00022  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    00023  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
    00024  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
    00025  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
    00026  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
    00027  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    00028  */
    00029
    00030 #if defined(LIBC_SCCS) && !defined(lint)
    00031 static char *rcsid = "$OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $";
    00032 #endif /* LIBC_SCCS and not lint */
    00033
    00034 #include <sys/types.h>
    00035 #include <string.h>
    00036
    00037 /*
    00038  * Appends src to string dst of size siz (unlike strncat, siz is the
    00039  * full size of dst, not space left).  At most siz-1 characters
    00040  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
    00041  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
    00042  * If retval >= siz, truncation occurred.
    00043  */
    00044 size_t
    00045 strlcat(dst, src, siz)
    00046         char *dst;
    00047         const char *src;
    00048         size_t siz;
    00049 {
    00050         register char *d = dst;
    00051         register const char *s = src;
    00052         register size_t n = siz;
    00053         size_t dlen;
    00054
    00055         /* Find the end of dst and adjust bytes left but don't go past end */
    00056         while (n-- != 0 && *d != '\0')
    00057                 d++;
    00058         dlen = d - dst;
    00059         n = siz - dlen;
    00060
    00061         if (n == 0)
    00062                 return(dlen + strlen(s));
    00063         while (*s != '\0') {
    00064                 if (n != 1) {
    00065                         *d++ = *s;
    00066                         n--;
    00067                 }
    00068                 s++;
    00069         }
    00070         *d = '\0';
    00071
    00072         return(dlen + (s - src));       /* count does not include NUL */
    00073 }
    00074