feat: add initial routing function

include/lnm/http/consts.h

@@ -13,6 +13,7 @@ typedef enum lnm_http_method {
   lnm_http_method_patch,
   lnm_http_method_delete,
   lnm_http_method_head,
+  lnm_http_method_total,
 } lnm_http_method;
 
 extern const char *lnm_http_status_names[][32];

include/lnm/http/router.h

@@ -0,0 +1,39 @@
+#ifndef LNM_HTTP_ROUTER
+#define LNM_HTTP_ROUTER
+
+#include "lnm/common.h"
+#include "lnm/http/consts.h"
+
+typedef struct lnm_http_route lnm_http_route;
+
+typedef struct lnm_http_router lnm_http_router;
+
+typedef enum lnm_http_route_err {
+  lnm_http_route_err_match = 0,
+  lnm_http_route_err_unknown_route = 1,
+  lnm_http_route_err_unknown_method = 2,
+} lnm_http_route_err;
+
+/**
+ * Allocate and initialize a new http_router.
+ */
+lnm_err lnm_http_router_init(lnm_http_router **out);
+
+void lnm_http_router_free(lnm_http_router *router);
+
+lnm_err lnm_http_router_add(lnm_http_route **out, lnm_http_router *http_router,
+                            lnm_http_method method, const char *path);
+
+/**
+ * Add all of the child router's routes to the parent router, under the given
+ * route prefix.
+ */
+lnm_err lnm_http_router_nest(lnm_http_router *parent,
+                             const lnm_http_router *child, const char *prefix);
+
+lnm_http_route_err lnm_http_router_route(const lnm_http_route **out,
+                                         const lnm_http_router *router,
+                                         lnm_http_method method,
+                                         const char *path);
+
+#endif