wip: vt parsing: initial csi/osc dispatching

terminal.h

@@ -0,0 +1,70 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stddef.h>
+
+struct cell {
+    char c[5];
+    uint32_t foreground;
+    uint32_t background;
+    bool dirty;
+};
+
+struct grid {
+    int cols;
+    int rows;
+    int cell_width;
+    int cell_height;
+
+    int cursor;
+    struct cell *cells;
+
+    uint32_t foreground;
+    uint32_t background;
+
+    bool dirty;
+    bool all_dirty;
+};
+
+struct vt {
+    int state;  /* enum state */
+    struct {
+        struct {
+            unsigned value;
+            struct {
+                unsigned value[16];
+                size_t idx;
+            } sub;
+        } v[16];
+        size_t idx;
+    } params;
+    struct {
+        uint8_t data[2];
+        size_t idx;
+    } intermediates;
+    struct {
+        uint8_t data[1024];
+        size_t idx;
+    } osc;
+    struct {
+        uint8_t data[4];
+        size_t idx;
+        size_t left;
+    } utf8;
+    bool bold;
+    bool dim;
+    bool italic;
+    bool underline;
+    bool strikethrough;
+    bool blink;
+    bool conceal;
+    bool reverse;
+    uint32_t foreground;
+    uint32_t background;
+};
+
+struct terminal {
+    struct vt vt;
+    struct grid grid;
+};