Initial patterm project

internal/vt/ghostty_cgo.go

@@ -0,0 +1,38 @@
+//go:build !nocgo
+
+package vt
+
+/*
+// This preamble must contain DECLARATIONS ONLY — cgo refuses to compile
+// a file that both defines functions in its preamble and has //export
+// directives. The helper definitions live in ghostty.go's preamble.
+
+#include <stdint.h>
+#include <stddef.h>
+#include <ghostty/vt.h>
+*/
+import "C"
+
+import (
+	"runtime/cgo"
+	"unsafe"
+)
+
+//export pattermGhosttyWritePty
+func pattermGhosttyWritePty(_ C.GhosttyTerminal, userdata unsafe.Pointer, data *C.uint8_t, length C.size_t) {
+	if userdata == nil || data == nil || length == 0 {
+		return
+	}
+	h := cgo.Handle(uintptr(userdata))
+	v := h.Value()
+	e, ok := v.(*GhosttyEmulator)
+	if !ok || e == nil {
+		return
+	}
+	cb := e.writePTYCallback()
+	if cb == nil {
+		return
+	}
+	buf := C.GoBytes(unsafe.Pointer(data), C.int(length))
+	cb(buf)
+}