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-rw-r--r--lib/strlcpy.c58
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diff --git a/lib/strlcpy.c b/lib/strlcpy.c
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+/* 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.
+ *
+ * The GNU C Library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * The GNU C Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with the GNU C Library; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+/* 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 */