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Annotation of mandoc/compat_strlcat.c, Revision 1.6

1.6     ! schwarze    1: /*     $Id: compat_strlcat.c,v 1.5 2020/06/15 01:37:15 schwarze Exp $  */
        !             2: /*     $OpenBSD: strlcat.c,v 1.19 2019/01/25 00:19:25 millert Exp $    */
1.1       kristaps    3:
                      4: /*
1.6     ! schwarze    5:  * Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
1.1       kristaps    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: /*
1.6     ! schwarze   25:  * Appends src to string dst of size dsize (unlike strncat, dsize is the
        !            26:  * full size of dst, not space left).  At most dsize-1 characters
        !            27:  * will be copied.  Always NUL terminates (unless dsize <= strlen(dst)).
        !            28:  * Returns strlen(src) + MIN(dsize, strlen(initial dst)).
        !            29:  * If retval >= dsize, truncation occurred.
1.1       kristaps   30:  */
                     31: size_t
1.6     ! schwarze   32: strlcat(char *dst, const char *src, size_t dsize)
1.1       kristaps   33: {
1.6     ! schwarze   34:        const char *odst = dst;
        !            35:        const char *osrc = src;
        !            36:        size_t n = dsize;
1.1       kristaps   37:        size_t dlen;
                     38:
1.6     ! schwarze   39:        /* Find the end of dst and adjust bytes left but don't go past end. */
        !            40:        while (n-- != 0 && *dst != '\0')
        !            41:                dst++;
        !            42:        dlen = dst - odst;
        !            43:        n = dsize - dlen;
        !            44:
        !            45:        if (n-- == 0)
        !            46:                return(dlen + strlen(src));
        !            47:        while (*src != '\0') {
        !            48:                if (n != 0) {
        !            49:                        *dst++ = *src;
1.1       kristaps   50:                        n--;
                     51:                }
1.6     ! schwarze   52:                src++;
1.1       kristaps   53:        }
1.6     ! schwarze   54:        *dst = '\0';
1.1       kristaps   55:
1.6     ! schwarze   56:        return(dlen + (src - osrc));    /* count does not include NUL */
1.1       kristaps   57: }