1 files changed, 45 insertions, 0 deletions
diff --git a/lib/strlcpy.c b/lib/strlcpy.c
new file mode 100644
index 0000000..74ea9cb
--- /dev/null
+++ b/lib/strlcpy.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/* Copy a null-terminated string to a fixed-size buffer, with length checking.
+ * Copyright (C) 2016 Free Software Foundation, Inc.
+ * This file is part of the GNU C Library.
+ */
+
+/* adapted for Quagga from glibc patch submission originally from
+ * Florian Weimer <fweimer@redhat.com>, 2016-05-18 */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <string.h>
+
+#ifndef HAVE_STRLCPY
+#undef strlcpy
+
+size_t strlcpy(char *__restrict dest,
+	       const char *__restrict src, size_t destsize);
+
+size_t strlcpy(char *__restrict dest,
+	       const char *__restrict src, size_t destsize)
+{
+	size_t src_length = strlen(src);
+
+	if (__builtin_expect(src_length >= destsize, 0)) {
+		if (destsize > 0) {
+			/*
+			 * Copy the leading portion of the string.  The last
+			 * character is subsequently overwritten with the NUL
+			 * terminator, but the destination destsize is usually
+			 * a multiple of a small power of two, so writing it
+			 * twice should be more efficient than copying an odd
+			 * number of bytes.
+			 */
+			memcpy(dest, src, destsize);
+			dest[destsize - 1] = '\0';
+		}
+	} else
+		/* Copy the string and its terminating NUL character.  */
+		memcpy(dest, src, src_length + 1);
+	return src_length;
+}
+#endif /* HAVE_STRLCPY */