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fix(renderer): integer overflows

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Yves Biener
2025-02-14 20:57:48 +01:00
parent bbe6f4741e
commit 4cda202873
2 changed files with 25 additions and 10 deletions
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10
src/render.zig
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@@ -37,17 +37,17 @@ pub const Buffered = struct {
defer this.size = size;
if (!this.created) {
this.screen = this.allocator.alloc(Cell, size.cols * size.rows) catch @panic("render.zig: Out of memory.");
this.screen = this.allocator.alloc(Cell, @as(usize, size.cols) * @as(usize, size.rows)) catch @panic("render.zig: Out of memory.");
@memset(this.screen, .{});
this.virtual_screen = this.allocator.alloc(Cell, size.cols * size.rows) catch @panic("render.zig: Out of memory.");
this.virtual_screen = this.allocator.alloc(Cell, @as(usize, size.cols) * @as(usize, size.rows)) catch @panic("render.zig: Out of memory.");
@memset(this.virtual_screen, .{});
this.created = true;
} else {
this.allocator.free(this.screen);
this.screen = this.allocator.alloc(Cell, size.cols * size.rows) catch @panic("render.zig: Out of memory.");
this.screen = this.allocator.alloc(Cell, @as(usize, size.cols) * @as(usize, size.rows)) catch @panic("render.zig: Out of memory.");
@memset(this.screen, .{});
this.allocator.free(this.virtual_screen);
this.virtual_screen = this.allocator.alloc(Cell, size.cols * size.rows) catch @panic("render.zig: Out of memory.");
this.virtual_screen = this.allocator.alloc(Cell, @as(usize, size.cols) * @as(usize, size.rows)) catch @panic("render.zig: Out of memory.");
@memset(this.virtual_screen, .{});
}
try this.clear();
@@ -69,7 +69,7 @@ pub const Buffered = struct {
var idx: usize = 0;
var vs = this.virtual_screen;
const anchor = (viewport.anchor.row * this.size.cols) + viewport.anchor.col;
const anchor: usize = (@as(usize, viewport.anchor.row) * @as(usize, this.size.cols)) + @as(usize, viewport.anchor.col);
blk: for (0..viewport.rows) |row| {
for (0..viewport.cols) |col| {