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       ---
       strlcat.c (1746B)
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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 <sys/types.h>
           20 #include <string.h>
           21 
           22 /*
           23  * Appends src to string dst of size dsize (unlike strncat, dsize is the
           24  * full size of dst, not space left).  At most dsize-1 characters
           25  * will be copied.  Always NUL terminates (unless dsize <= strlen(dst)).
           26  * Returns strlen(src) + MIN(dsize, strlen(initial dst)).
           27  * If retval >= dsize, truncation occurred.
           28  */
           29 size_t
           30 strlcat(char *dst, const char *src, size_t dsize)
           31 {
           32         const char *odst = dst;
           33         const char *osrc = src;
           34         size_t n = dsize;
           35         size_t dlen;
           36 
           37         /* Find the end of dst and adjust bytes left but don't go past end. */
           38         while (n-- != 0 && *dst != '\0')
           39                 dst++;
           40         dlen = dst - odst;
           41         n = dsize - dlen;
           42 
           43         if (n-- == 0)
           44                 return(dlen + strlen(src));
           45         while (*src != '\0') {
           46                 if (n != 0) {
           47                         *dst++ = *src;
           48                         n--;
           49                 }
           50                 src++;
           51         }
           52         *dst = '\0';
           53 
           54         return(dlen + (src - osrc));        /* count does not include NUL */
           55 }