refactor: started lnm library

lnm/include/lnm/common.h

@@ -0,0 +1,25 @@
+#ifndef LNM_COMMON
+#define LNM_COMMON
+
+#define LNM_RES(x)                                                             \
+  {                                                                            \
+    lnm_err res = x;                                                           \
+    if (res != lnm_err_ok)                                                     \
+      return res;                                                              \
+  }
+
+#define LNM_RES2(x, e)                                                         \
+  {                                                                            \
+    lnm_err res = x;                                                           \
+    if (res != lnm_err_ok) {                                                   \
+      e;                                                                       \
+      return res;                                                              \
+    }                                                                          \
+  }
+
+typedef enum {
+  lnm_err_ok = 0,
+  lnm_err_failed_alloc,
+} lnm_err;
+
+#endif

lnm/include/lnm/loop.h

@@ -0,0 +1,42 @@
+#ifndef LNM_LOOP
+#define LNM_LOOP
+
+#include <stdlib.h>
+
+#include "lnm/common.h"
+
+#define LNM_LOOP_BUF_SIZE 4096
+
+typedef enum {
+  lnm_loop_state_req = 0,
+  lnm_loop_state_res,
+  lnm_loop_state_end,
+} lnm_loop_state;
+
+typedef struct {
+  int fd;
+  lnm_loop_state state;
+  void *ctx;
+  struct {
+    char buf[LNM_LOOP_BUF_SIZE];
+    size_t size;
+    size_t read;
+  } r;
+  struct {
+    char buf[LNM_LOOP_BUF_SIZE];
+    size_t size;
+    size_t written;
+  } w;
+} lnm_loop_conn;
+
+typedef struct {
+  struct {
+    lnm_loop_conn **arr;
+    size_t len;
+  } conns;
+  void *gctx;
+  lnm_err (*ctx_init)(void **out, void *gctx);
+  void (*ctx_free)(void *ctx);
+} lnm_loop;
+
+#endif