Merge pull request #15 from sylr/fix-panic-large-screen

Fix integer overflow panic on large display

src/main.zig

@@ -132,7 +132,7 @@ var bg: [MAX_COLOR][]u8 = undefined;
 
 // cache fg/bg ansi codes
 pub fn initColor() void {
-    var color_idx: u16 = 0;
+    var color_idx: u32 = 0;
     while (color_idx < MAX_COLOR) : (color_idx += 1) {
         fg[color_idx] = std.fmt.allocPrint(allocator, "{s}38;5;{d}m", .{ csi, color_idx }) catch unreachable;
         bg[color_idx] = std.fmt.allocPrint(allocator, "{s}48;5;{d}m", .{ csi, color_idx }) catch unreachable;
@@ -369,7 +369,7 @@ pub fn showGrayscale() void {
     var fg_idx: u8 = 15;
     emit(fg[fg_idx]);
 
-    var bg_idx: u16 = 232;
+    var bg_idx: u32 = 232;
     while (bg_idx < 256) : (bg_idx += 1) {
         if (bg_idx > 243) {
             fg_idx = 0;
@@ -548,10 +548,10 @@ pub fn freeBuf() void {
 
 pub fn showDoomFire() void {
     //term size => fire size
-    const FIRE_H: u16 = @as(u16, @intCast(term_sz.height)) * 2;
-    const FIRE_W: u16 = @as(u16, @intCast(term_sz.width));
-    const FIRE_SZ: u16 = FIRE_H * FIRE_W;
-    const FIRE_LAST_ROW: u16 = (FIRE_H - 1) * FIRE_W;
+    const FIRE_H: u32 = @as(u32, @intCast(term_sz.height)) * 2;
+    const FIRE_W: u32 = @as(u32, @intCast(term_sz.width));
+    const FIRE_SZ: u32 = FIRE_H * FIRE_W;
+    const FIRE_LAST_ROW: u32 = (FIRE_H - 1) * FIRE_W;
 
     //colors - tinker w/palette as needed!
     const fire_palette = [_]u8{ 0, 233, 234, 52, 53, 88, 89, 94, 95, 96, 130, 131, 132, 133, 172, 214, 215, 220, 220, 221, 3, 226, 227, 230, 195, 230 };
@@ -564,7 +564,7 @@ pub fn showDoomFire() void {
     defer allocator.free(screen_buf);
 
     //init buffer
-    var buf_idx: u16 = 0;
+    var buf_idx: u32 = 0;
     while (buf_idx < FIRE_SZ) : (buf_idx += 1) {
         screen_buf[buf_idx] = fire_black;
     }
@@ -583,22 +583,22 @@ pub fn showDoomFire() void {
 
     //scope cache ////////////////////
     //scope cache - update fire buf
-    var doFire_x: u16 = 0;
-    var doFire_y: u16 = 0;
-    var doFire_idx: u16 = 0;
+    var doFire_x: u32 = 0;
+    var doFire_y: u32 = 0;
+    var doFire_idx: u32 = 0;
 
     //scope cache - spread fire
     var spread_px: u8 = 0;
     var spread_rnd_idx: u8 = 0;
-    var spread_dst: u16 = 0;
+    var spread_dst: u32 = 0;
 
     //scope cache - frame reset
     const init_frame = std.fmt.allocPrint(allocator, "{s}{s}{s}", .{ cursor_home, bg[0], fg[0] }) catch unreachable;
     defer allocator.free(init_frame);
 
     //scope cache - fire 2 screen buffer
-    var frame_x: u16 = 0;
-    var frame_y: u16 = 0;
+    var frame_x: u32 = 0;
+    var frame_y: u32 = 0;
     var px_hi: u8 = fire_black;
     var px_lo: u8 = fire_black;
     var px_prev_hi = px_hi;
@@ -711,7 +711,7 @@ const win32 = struct {
     pub const CONSOLE_SCREEN_BUFFER_INFO = extern struct {
         dwSize: COORD,
         dwCursorPosition: COORD,
-        wAttributes: u16,
+        wAttributes: u32,
         srWindow: SMALL_RECT,
         dwMaximumWindowSize: COORD,
     };