1 files changed, 75 insertions, 0 deletions
diff --git a/lib/defaults.c b/lib/defaults.c
new file mode 100644
index 000000000..cfc8fa27f
--- /dev/null
+++ b/lib/defaults.c
@@ -0,0 +1,75 @@
+/*
+ * FRR switchable defaults.
+ * Copyright (c) 2017-2019  David Lamparter, for NetDEF, Inc.
+ *
+ * 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.
+ */
+
+#include <zebra.h>
+
+#include "defaults.h"
+#include "libfrr.h"
+#include "version.h"
+
+static int version_value(int ch)
+{
+	/* non-ASCII shouldn't happen */
+	if (ch < 0 || ch >= 128)
+		return 2;
+
+	/* ~foo sorts older than nothing */
+	if (ch == '~')
+		return 0;
+	if (ch == '\0')
+		return 1;
+	if (isalpha(ch))
+		return 0x100 + tolower(ch);
+
+	/* punctuation and digits (and everything else) */
+	return 0x200 + ch;
+}
+
+int frr_version_cmp(const char *aa, const char *bb)
+{
+	const char *apos = aa, *bpos = bb;
+
+	/* || is correct, we won't scan past the end of a string since that
+	 * doesn't compare equal to anything else */
+	while (apos[0] || bpos[0]) {
+		if (isdigit((unsigned char)apos[0]) &&
+		    isdigit((unsigned char)bpos[0])) {
+			unsigned long av, bv;
+			char *aend = NULL, *bend = NULL;
+
+			av = strtoul(apos, &aend, 10);
+			bv = strtoul(bpos, &bend, 10);
+			if (av < bv)
+				return -1;
+			if (av > bv)
+				return 1;
+
+			apos = aend;
+			bpos = bend;
+			continue;
+		}
+
+		int a = version_value(*apos++);
+		int b = version_value(*bpos++);
+
+		if (a < b)
+			return -1;
+		if (a > b)
+			return 1;
+	}
+	return 0;
+}