[*] Initial commit

lonetix/strncpyz.c

@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+/**
+ * \file strncpyz.c
+ *
+ * Implements `Df_strncpyz()`.
+ *
+ * \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
+ * \author    Lorenzo Cogotti
+ */
+
+// THIS CODE IS DERIVED FROM OpenBSD strlcpy.c
+// ORIGINAL LICENSE TERMS FOLLOW:
+
+/* $OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 millert Exp $ */
+
+/*
+ * Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+// ORIGINAL LICENSE TERMS END ***
+
+#include "strlib.h"
+
+size_t Df_strncpyz(char *dst, const char *src, size_t n)
+{
+	const char *osrc = src;
+	size_t nleft     = n;
+
+	// Copy as many bytes as will fit
+	if (nleft > 0) {
+		while (--nleft != 0) {
+			if ((*dst++ = *src++) == '\0')
+				break;
+		}
+	}
+
+	// Not enough room in dst, add NUL and traverse rest of src
+	if (nleft == 0) {
+		if (n > 0)
+			*dst = '\0';  // NUL-terminate dst
+
+		while (*src++ != '\0');
+	}
+
+	return src - osrc - 1;  // count does not include NUL
+}