tstrlcat.c - scribo - Email-based phlog generator
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       tstrlcat.c (1812B)
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            1 /* NOTE: This code was adapted from openbsd-compat/strlcat.c in OpenSSH */
            2 
            3 /*        $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie 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 /* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */
           22 
           23 #include <sys/types.h>
           24 #include <string.h>
           25 
           26 /*
           27  * Appends src to string dst of size siz (unlike strncat, siz is the
           28  * full size of dst, not space left).  At most siz-1 characters
           29  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
           30  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
           31  * If retval >= siz, truncation occurred.
           32  */
           33 size_t
           34 strlcat(char *dst, const char *src, size_t siz)
           35 {
           36         char *d = dst;
           37         const char *s = src;
           38         size_t n = siz;
           39         size_t dlen;
           40 
           41         /* Find the end of dst and adjust bytes left but don't go past end */
           42         while (n-- != 0 && *d != '\0')
           43                 d++;
           44         dlen = d - dst;
           45         n = siz - dlen;
           46 
           47         if (n == 0)
           48                 return(dlen + strlen(s));
           49         while (*s != '\0') {
           50                 if (n != 1) {
           51                         *d++ = *s;
           52                         n--;
           53                 }
           54                 s++;
           55         }
           56         *d = '\0';
           57 
           58         return(dlen + (s - src));        /* count does not include NUL */
           59 }
           60 
           61