Add a set of simple version comparison helpers

[ccan] / ccan / version / _info

diff --git a/ccan/version/_info b/ccan/version/_info
new file mode 100644 (file)
index 0000000..3aad1e8
--- /dev/null
+++ b/ccan/version/_info
@@ -0,0 +1,37 @@
+#include <string.h>
+#include "config.h"
+
+/**
+ * version - helper functions for major.minor-style version numbers
+ *
+ * This code provides some helper functions to deal with version numbers in
+ * the form major.minor.
+ *
+ * Author: Peter Hutterer <peter.hutterer@who-t.net>
+ * Maintainer: Peter Hutterer <peter.hutterer@who-t.net>
+ * License: BSD-MIT
+ *
+ * Example:
+ *     struct version a = version(1, 0);
+ *     struct version b = version(2, 2);
+ *
+ *     if (version_cmp(a, b) < 0)
+ *             printf("Feature supported in version 2.2 but we have %d.%d\n",
+ *                     version_major(a), version_minor(a));
+ *
+ *     if (version_cmp(a, version(3, 4)) < 0)
+ *             printf("Feature only supported in version 3.4\n");
+ *
+ */
+int main(int argc, char *argv[])
+{
+       /* Expect exactly one argument */
+       if (argc != 2)
+               return 1;
+
+       if (strcmp(argv[1], "depends") == 0) {
+               return 0;
+       }
+
+       return 1;
+}