strlcat.c - sfeed - RSS and Atom parser
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       strlcat.c (1723B)
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            1 /*        $OpenBSD: strlcat.c,v 1.15 2015/03/02 21:41:08 millert Exp $        */
            2 
            3 /*
            4  * Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com>
            5  *
            6  * Permission to use, copy, modify, and distribute this software for any
            7  * purpose with or without fee is hereby granted, provided that the above
            8  * copyright notice and this permission notice appear in all copies.
            9  *
           10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
           11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
           12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
           13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
           14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
           15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
           16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
           17  */
           18 
           19 #include <string.h>
           20 
           21 /*
           22  * Appends src to string dst of size dsize (unlike strncat, dsize is the
           23  * full size of dst, not space left).  At most dsize-1 characters
           24  * will be copied.  Always NUL terminates (unless dsize <= strlen(dst)).
           25  * Returns strlen(src) + MIN(dsize, strlen(initial dst)).
           26  * If retval >= dsize, truncation occurred.
           27  */
           28 size_t
           29 strlcat(char *dst, const char *src, size_t dsize)
           30 {
           31         const char *odst = dst;
           32         const char *osrc = src;
           33         size_t n = dsize;
           34         size_t dlen;
           35 
           36         /* Find the end of dst and adjust bytes left but don't go past end. */
           37         while (n-- != 0 && *dst != '\0')
           38                 dst++;
           39         dlen = dst - odst;
           40         n = dsize - dlen;
           41 
           42         if (n-- == 0)
           43                 return(dlen + strlen(src));
           44         while (*src != '\0') {
           45                 if (n != 0) {
           46                         *dst++ = *src;
           47                         n--;
           48                 }
           49                 src++;
           50         }
           51         *dst = '\0';
           52 
           53         return(dlen + (src - osrc));        /* count does not include NUL */
           54 }