Ruby 1.9.3p327(2012-11-10revision37606)
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 "ruby/missing.h"
00035 #include <sys/types.h>
00036 #include <string.h>
00037 
00038 /*
00039  * Copy src to string dst of size siz.  At most siz-1 characters
00040  * will be copied.  Always NUL terminates (unless siz == 0).
00041  * Returns strlen(src); if retval >= siz, truncation occurred.
00042  */
00043 size_t
00044 strlcpy(dst, src, siz)
00045         char *dst;
00046         const char *src;
00047         size_t siz;
00048 {
00049         register char *d = dst;
00050         register const char *s = src;
00051         register size_t n = siz;
00052 
00053         /* Copy as many bytes as will fit */
00054         if (n != 0 && --n != 0) {
00055                 do {
00056                         if ((*d++ = *s++) == 0)
00057                                 break;
00058                 } while (--n != 0);
00059         }
00060 
00061         /* Not enough room in dst, add NUL and traverse rest of src */
00062         if (n == 0) {
00063                 if (siz != 0)
00064                         *d = '\0';              /* NUL-terminate dst */
00065                 while (*s++)
00066                         ;
00067         }
00068 
00069         return(s - src - 1);    /* count does not include NUL */
00070 }
00071