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Annotation of mandoc/compat_strlcpy.c, Revision 1.5

1.5     ! schwarze    1: /*     $Id$    */
1.1       kristaps    2: /*     $OpenBSD: strlcpy.c,v 1.11 2006/05/05 15:27:38 millert 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:  * Copy src to string dst of size siz.  At most siz-1 characters
                     26:  * will be copied.  Always NUL terminates (unless siz == 0).
                     27:  * Returns strlen(src); if retval >= siz, truncation occurred.
                     28:  */
                     29: size_t
                     30: strlcpy(char *dst, const char *src, size_t siz)
                     31: {
                     32:        char *d = dst;
                     33:        const char *s = src;
                     34:        size_t n = siz;
                     35:
                     36:        /* Copy as many bytes as will fit */
                     37:        if (n != 0) {
                     38:                while (--n != 0) {
                     39:                        if ((*d++ = *s++) == '\0')
                     40:                                break;
                     41:                }
                     42:        }
                     43:
                     44:        /* Not enough room in dst, add NUL and traverse rest of src */
                     45:        if (n == 0) {
                     46:                if (siz != 0)
                     47:                        *d = '\0';              /* NUL-terminate dst */
                     48:                while (*s++)
                     49:                        ;
                     50:        }
                     51:
                     52:        return(s - src - 1);    /* count does not include NUL */
                     53: }