feat(lnm): write server init code

lnm/include/lnm/common.h

@@ -23,6 +23,7 @@ typedef enum {
   lnm_err_failed_network,
   lnm_err_failed_poll,
   lnm_err_not_setup,
+  lnm_err_bad_regex
 } lnm_err;
 
 #endif

lnm/include/lnm/http/loop.h

@@ -0,0 +1,70 @@
+#ifndef LNM_HTTP_LOOP
+#define LNM_HTTP_LOOP
+
+#include "lnm/common.h"
+
+typedef struct lnm_loop lnm_http_loop;
+
+typedef struct lnm_http_conn lnm_http_conn;
+
+typedef struct lnm_http_step lnm_http_step;
+
+typedef struct lnm_http_route lnm_http_route;
+
+typedef lnm_err (*lnm_http_step_fn)(lnm_http_conn *conn);
+
+/**
+ * Initialize a new `lnm_http_loop`.
+ *
+ * @param out where to store pointer to new `lnm_http_loop`
+ */
+lnm_err lnm_http_loop_init(lnm_http_loop **out);
+
+/**
+ * Initialize a first step
+ *
+ * @param out where to store pointer to new `lnm_http_step`
+ * @param fn step function associated with the step
+ */
+lnm_err lnm_http_step_init(lnm_http_step **out, lnm_http_step_fn fn);
+
+/**
+ * Append the given step fn to the step.
+ *
+ * @param out where to store pointer to new `lnm_http_step`
+ * @param step step to append new step to
+ * @param fn step funcitonn
+ */
+lnm_err lnm_http_step_append(lnm_http_step **out, lnm_http_step *step,
+                             lnm_http_step_fn fn);
+
+/**
+ * Initialize a new route of type literal.
+ *
+ * @param out where to store pointer to new `lnm_http_route`
+ * @param path literal path to match
+ * @param step step to process request with
+ */
+lnm_err lnm_http_route_init_literal(lnm_http_route **out, const char *path,
+                                    lnm_http_step *step);
+
+/**
+ * Initialize a new route of type regex.
+ *
+ * @param out where to store pointer to new `lnm_http_route`
+ * @param pattern regex pattern
+ * @param regex_group_count how many regex groups are contained in the pattern
+ * @param step step to process request with
+ */
+lnm_err lnm_http_route_init_regex(lnm_http_route **out, const char *pattern,
+                                  int regex_group_count, lnm_http_step *step);
+
+/**
+ * Add a new route to the HTTP route.
+ *
+ * @param hl HTTP loop to modify
+ * @param route route to add
+ */
+void lnm_http_loop_route_add(lnm_http_loop *hl, lnm_http_route *route);
+
+#endif

lnm/include/lnm/loop.h

@@ -30,7 +30,7 @@ typedef struct {
   } w;
 } lnm_loop_conn;
 
-typedef struct {
+typedef struct lnm_loop {
   int listen_fd;
   struct {
     lnm_loop_conn **arr;