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       ---
       strlcpy.c (1599B)
       ---
            1 /*        $OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 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  * Copy string src to buffer dst of size dsize.  At most dsize-1
           24  * chars will be copied.  Always NUL terminates (unless dsize == 0).
           25  * Returns strlen(src); if retval >= dsize, truncation occurred.
           26  */
           27 size_t
           28 strlcpy(char *dst, const char *src, size_t dsize)
           29 {
           30         const char *osrc = src;
           31         size_t nleft = dsize;
           32 
           33         /* Copy as many bytes as will fit. */
           34         if (nleft != 0) {
           35                 while (--nleft != 0) {
           36                         if ((*dst++ = *src++) == '\0')
           37                                 break;
           38                 }
           39         }
           40 
           41         /* Not enough room in dst, add NUL and traverse rest of src. */
           42         if (nleft == 0) {
           43                 if (dsize != 0)
           44                         *dst = '\0';                /* NUL-terminate dst */
           45                 while (*src++)
           46                         ;
           47         }
           48 
           49         return(src - osrc - 1);        /* count does not include NUL */
           50 }