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# missing/strlcpy.c

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    00001 /*      $OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $     */
    00002
    00003 /*
    00004  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
    00005  * All rights reserved.
    00006  *
    00007  * Redistribution and use in source and binary forms, with or without
    00008  * modification, are permitted provided that the following conditions
    00009  * are met:
    00010  * 1. Redistributions of source code must retain the above copyright
    00011  *    notice, this list of conditions and the following disclaimer.
    00012  * 2. Redistributions in binary form must reproduce the above copyright
    00013  *    notice, this list of conditions and the following disclaimer in the
    00014  *    documentation and/or other materials provided with the distribution.
    00015  * 3. The name of the author may not be used to endorse or promote products
    00016  *    derived from this software without specific prior written permission.
    00017  *
    00018  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
    00019  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
    00020  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
    00021  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
    00022  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    00023  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
    00024  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
    00025  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
    00026  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
    00027  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    00028  */
    00029
    00030 #if defined(LIBC_SCCS) && !defined(lint)
    00031 static char *rcsid = "$OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $";
    00032 #endif /* LIBC_SCCS and not lint */
    00033
    00034 #include <sys/types.h>
    00035 #include <string.h>
    00036
    00037 /*
    00038  * Copy src to string dst of size siz.  At most siz-1 characters
    00039  * will be copied.  Always NUL terminates (unless siz == 0).
    00040  * Returns strlen(src); if retval >= siz, truncation occurred.
    00041  */
    00042 size_t
    00043 strlcpy(dst, src, siz)
    00044         char *dst;
    00045         const char *src;
    00046         size_t siz;
    00047 {
    00048         register char *d = dst;
    00049         register const char *s = src;
    00050         register size_t n = siz;
    00051
    00052         /* Copy as many bytes as will fit */
    00053         if (n != 0 && --n != 0) {
    00054                 do {
    00055                         if ((*d++ = *s++) == 0)
    00056                                 break;
    00057                 } while (--n != 0);
    00058         }
    00059
    00060         /* Not enough room in dst, add NUL and traverse rest of src */
    00061         if (n == 0) {
    00062                 if (siz != 0)
    00063                         *d = '\0';              /* NUL-terminate dst */
    00064                 while (*s++)
    00065                         ;
    00066         }
    00067
    00068         return(s - src - 1);    /* count does not include NUL */
    00069 }
    00070