strlcpy.c - sic - simple irc client
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       ---
       strlcpy.c (1487B)
       ---
            1 /*
            2  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
            3  *
            4  * Permission to use, copy, modify, and distribute this software for any
            5  * purpose with or without fee is hereby granted, provided that the above
            6  * copyright notice and this permission notice appear in all copies.
            7  *
            8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
            9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
           10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
           11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
           12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
           13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
           14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
           15  */
           16 
           17 #include <string.h>
           18 #include <sys/types.h>
           19 
           20 /*
           21  * Copy src to string dst of size siz. At most siz-1 characters
           22  * will be copied. Always NUL terminates (unless siz == 0).
           23  * Returns strlen(src); if retval >= siz, truncation occurred.
           24  */
           25 size_t
           26 strlcpy(char *dst, const char *src, size_t siz)
           27 {
           28         char *d = dst;
           29         const char *s = src;
           30         size_t n = siz;
           31         /* Copy as many bytes as will fit */
           32         if (n != 0) {
           33                 while (--n != 0) {
           34                         if ((*d++ = *s++) == '\0')
           35                                 break;
           36                 }
           37         }
           38         /* Not enough room in dst, add NUL and traverse rest of src */
           39         if (n == 0) {
           40                 if (siz != 0)
           41                         *d = '\0'; /* NUL-terminate dst */
           42                 while (*s++)
           43                         ;
           44         }
           45         return(s - src - 1); /* count does not include NUL */
           46 }