[*] Initial commit

lonetix/strncatz.c

@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+/**
+ * \file strncatz.c
+ *
+ * Implements `Df_strncatz()`.
+ *
+ * \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
+ * \author    Lorenzo Cogotti
+ */
+
+// THIS CODE IS DERIVED FROM OpenBSD strlcat.c
+// ORIGINAL LICENSE TERMS FOLLOW:
+
+/* $OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $ */
+
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
+ * 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.
+ */
+
+// ORIGINAL LICENSE TERMS END ***
+
+#include "strlib.h"
+
+#include <string.h>
+
+size_t Df_strncatz(char *dst, const char *src, size_t n)
+{
+	char *d = dst;
+	const char *s = src;
+
+	size_t left = n;
+	size_t dlen;
+
+	// Find the end of dst and adjust bytes left but don't go past end
+	while (left-- != 0 && *d != '\0') d++;
+
+	dlen = d - dst;
+	left = n - dlen;
+
+	if (left == 0)
+		return dlen + strlen(s);
+
+	while (*s != '\0') {
+		if (left != 1) {
+			*d++ = *s;
+			left--;
+		}
+
+		s++;
+	}
+
+	*d = '\0';
+
+	return dlen + (s - src); // count does not include NUL
+}