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Annotation of mandoc/compat_strlcat.c, Revision 1.2

1.2     ! kristaps    1: #ifdef HAVE_CONFIG_H
        !             2: #include "config.h"
        !             3: #endif
        !             4:
1.1       kristaps    5: #ifdef HAVE_STRLCAT
                      6:
                      7: int dummy;
                      8:
                      9: #else
                     10:
                     11: /*     $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $      */
                     12:
                     13: /*
                     14:  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
                     15:  *
                     16:  * Permission to use, copy, modify, and distribute this software for any
                     17:  * purpose with or without fee is hereby granted, provided that the above
                     18:  * copyright notice and this permission notice appear in all copies.
                     19:  *
                     20:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     21:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     22:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     23:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     24:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     25:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     26:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     27:  */
                     28:
                     29: #include <sys/types.h>
                     30: #include <string.h>
                     31:
                     32: /*
                     33:  * Appends src to string dst of size siz (unlike strncat, siz is the
                     34:  * full size of dst, not space left).  At most siz-1 characters
                     35:  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
                     36:  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
                     37:  * If retval >= siz, truncation occurred.
                     38:  */
                     39: size_t
                     40: strlcat(char *dst, const char *src, size_t siz)
                     41: {
                     42:        char *d = dst;
                     43:        const char *s = src;
                     44:        size_t n = siz;
                     45:        size_t dlen;
                     46:
                     47:        /* Find the end of dst and adjust bytes left but don't go past end */
                     48:        while (n-- != 0 && *d != '\0')
                     49:                d++;
                     50:        dlen = d - dst;
                     51:        n = siz - dlen;
                     52:
                     53:        if (n == 0)
                     54:                return(dlen + strlen(s));
                     55:        while (*s != '\0') {
                     56:                if (n != 1) {
                     57:                        *d++ = *s;
                     58:                        n--;
                     59:                }
                     60:                s++;
                     61:        }
                     62:        *d = '\0';
                     63:
                     64:        return(dlen + (s - src));       /* count does not include NUL */
                     65: }
                     66:
                     67: #endif