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terminal: charset table should be len 256, not 255

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This commit is contained in:
Mitchell Hashimoto
2023-08-31 20:45:13 -07:00
parent f4fef559fb
commit 36756cc866
1 changed files with 8 additions and 7 deletions
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15
src/terminal/charsets.zig
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@ -85,14 +85,15 @@ const dec_special = tech: {
break :tech table; break :tech table;
}; };
const max_u8 = std.math.maxInt(u8); /// Our table length is 256 so we can contain all ASCII chars.
const table_len = std.math.maxInt(u8) + 1;
/// Creates a table that maps ASCII to ASCII as a getting started point. /// Creates a table that maps ASCII to ASCII as a getting started point.
fn initTable() [max_u8]u16 { fn initTable() [table_len]u16 {
var result: [max_u8]u16 = undefined; var result: [table_len]u16 = undefined;
var i: usize = 0; var i: usize = 0;
while (i < max_u8) : (i += 1) result[i] = @intCast(i); while (i < table_len) : (i += 1) result[i] = @intCast(i);
assert(i == max_u8); assert(i == table_len);
return result; return result;
} }
@ -105,9 +106,9 @@ test {
const table = @field(Charset, field.name).table(); const table = @field(Charset, field.name).table();
// Yes, I could use `max_u8` here, but I want to explicitly use a // Yes, I could use `table_len` here, but I want to explicitly use a
// hardcoded constant so that if there are miscompilations or a comptime // hardcoded constant so that if there are miscompilations or a comptime
// issue, we catch it. // issue, we catch it.
try testing.expectEqual(@as(usize, 255), table.len); try testing.expectEqual(@as(usize, 256), table.len);
} }
} }