Libc-825.25.tar.gz

[apple/libc.git] / string / strlcat.c

diff --git a/string/strlcat.c b/string/strlcat.c
index 7ec53b1fb0ba44a79701e4b056952eb84d093f1f..ac4416359a26ae78e881c6922cab0ab152c7ccbe 100644 (file)
--- a/string/strlcat.c
+++ b/string/strlcat.c
@@ -1,74 +1,38 @@
 /*
- * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
- * All rights reserved.
+ * Copyright (c) 2011 Apple, Inc. All rights reserved.
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- *    derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
- * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
  */
 
-#if defined(LIBC_SCCS) && !defined(lint)
-static char *rcsid = "$OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $";
-#endif /* LIBC_SCCS and not lint */
-#ifndef lint
-static const char rcsid[] =
-  "$FreeBSD: src/lib/libc/string/strlcat.c,v 1.2.4.2 2001/07/09 23:30:06 obrien Exp $";
-#endif
-
-#include <sys/types.h>
-#include <string.h>
-
-/*
- * Appends src to string dst of size siz (unlike strncat, siz is the
- * full size of dst, not space left).  At most siz-1 characters
- * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
- * Returns strlen(initial dst) + strlen(src); if retval >= siz,
- * truncation occurred.
- */
-size_t strlcat(dst, src, siz)
-       char *dst;
-       const char *src;
-       size_t siz;
-{
-       register char *d = dst;
-       register const char *s = src;
-       register size_t n = siz;
-       size_t dlen;
-
-       /* Find the end of dst and adjust bytes left but don't go past end */
-       while (n-- != 0 && *d != '\0')
-               d++;
-       dlen = d - dst;
-       n = siz - dlen;
-
-       if (n == 0)
-               return(dlen + strlen(s));
-       while (*s != '\0') {
-               if (n != 1) {
-                       *d++ = *s;
-                       n--;
-               }
-               s++;
-       }
-       *d = '\0';
+#include <strings.h>
 
-       return(dlen + (s - src));       /* count does not include NUL */
+size_t
+strlcat(char * restrict dst, const char * restrict src, size_t maxlen) {
+    const size_t srclen = strlen(src);
+    const size_t dstlen = strnlen(dst, maxlen);
+    if (dstlen == maxlen) return maxlen+srclen;
+    if (srclen < maxlen-dstlen) {
+        memcpy(dst+dstlen, src, srclen+1);
+    } else {
+        memcpy(dst+dstlen, src, maxlen-1);
+        dst[dstlen+maxlen-1] = '\0';
+    }
+    return dstlen + srclen;
 }