M xywrun.c → xywrun.c

@@ -262,12 +262,59 @@ // Console device
     {&xyw_memory[0xff10], 0, 0, console_output},
     // Clock device
     {&xyw_memory[0xff20], clock_init, clock_input, 0},
+    // File device
+    {&xyw_memory[0xff30], 0, 0, 0},
     // Display device
     {&xyw_memory[0xff40], 0, display_input, display_output},
     // ...
 };
 // clang-format on
 
+char *title, *description, *author, *date;
+xyw_byte width, height;
+
+static void process_metadata()
+{
+    if ((xyw_memory[0x0003] == 0x1C | XYW_MODE_W) && xyw_memory[0x0004] == '-' && xyw_memory[0x0005] == '-' && xyw_memory[0x0006] == '-')
+    {
+        // JMPw found followed by ---, read metadata
+        xyw_word p = 0x0007;
+
+        title = (char *)&xyw_memory[p];
+        while (p < MEMORY_SIZE && xyw_memory[p] != 0)
+            p++;
+        if (p >= MEMORY_SIZE)
+            return;
+        p++;
+
+        description = (char *)&xyw_memory[p];
+        while (p < MEMORY_SIZE && xyw_memory[p] != 0)
+            p++;
+        if (p >= MEMORY_SIZE)
+            return;
+        p++;
+
+        author = (char *)&xyw_memory[p];
+        while (p < MEMORY_SIZE && xyw_memory[p] != 0)
+            p++;
+        if (p >= MEMORY_SIZE)
+            return;
+        p++;
+
+        date = (char *)&xyw_memory[p];
+        while (p < MEMORY_SIZE && xyw_memory[p] != 0)
+            p++; // skip date string
+        if (p >= MEMORY_SIZE)
+            return;
+        p++;
+
+        if (p + 1 >= MEMORY_SIZE)
+            return;
+        width = xyw_memory[p++];
+        height = xyw_memory[p++];
+    }
+}
+
 //// Main run function
 int xyw_run(const char *input)
 {
@@ -296,6 +343,8 @@ {
             xyw_devices[i].init(xyw_devices[i].data);
         }
     }
+    // Process metadata
+    process_metadata();
     // Set direct page to device page by default
     xyw_memory[SYSTEM_PAGE] = 0xff;
     // Initialize fenster