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Annotation of mandoc/compat_strlcat.c, Revision 1.5

1.5     ! schwarze    1: /*     $Id$    */
1.1       kristaps    2: /*     $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $      */
                      3:
                      4: /*
                      5:  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
                      6:  *
                      7:  * Permission to use, copy, modify, and distribute this software for any
                      8:  * purpose with or without fee is hereby granted, provided that the above
                      9:  * copyright notice and this permission notice appear in all copies.
                     10:  *
                     11:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     12:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     13:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     14:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     15:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     16:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     17:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     18:  */
1.5     ! schwarze   19: #include "config.h"
1.1       kristaps   20:
                     21: #include <sys/types.h>
                     22: #include <string.h>
                     23:
                     24: /*
                     25:  * Appends src to string dst of size siz (unlike strncat, siz is the
                     26:  * full size of dst, not space left).  At most siz-1 characters
                     27:  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
                     28:  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
                     29:  * If retval >= siz, truncation occurred.
                     30:  */
                     31: size_t
                     32: strlcat(char *dst, const char *src, size_t siz)
                     33: {
                     34:        char *d = dst;
                     35:        const char *s = src;
                     36:        size_t n = siz;
                     37:        size_t dlen;
                     38:
                     39:        /* Find the end of dst and adjust bytes left but don't go past end */
                     40:        while (n-- != 0 && *d != '\0')
                     41:                d++;
                     42:        dlen = d - dst;
                     43:        n = siz - dlen;
                     44:
                     45:        if (n == 0)
                     46:                return(dlen + strlen(s));
                     47:        while (*s != '\0') {
                     48:                if (n != 1) {
                     49:                        *d++ = *s;
                     50:                        n--;
                     51:                }
                     52:                s++;
                     53:        }
                     54:        *d = '\0';
                     55:
                     56:        return(dlen + (s - src));       /* count does not include NUL */
                     57: }