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config: C API read allows any packed struct that fits in c int

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This commit is contained in:
Mitchell Hashimoto
2023-12-13 18:54:41 -08:00
parent 6b94252da6
commit 4e0916d397
1 changed files with 12 additions and 5 deletions
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17
src/config/c_get.zig
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@ -39,17 +39,24 @@ pub fn get(config: *const Config, k: Key, ptr_raw: *anyopaque) bool {
ptr.* = @floatCast(value);
},
Color => {
const ptr: *c_uint = @ptrCast(@alignCast(ptr_raw));
ptr.* = @as(c_uint, @as(u24, @bitCast(value)));
},
else => |T| switch (@typeInfo(T)) {
.Enum => {
const ptr: *[*:0]const u8 = @ptrCast(@alignCast(ptr_raw));
ptr.* = @tagName(value);
},
.Struct => |info| {
// Packed structs that are less than or equal to the
// size of a C int can be passed directly as their
// bit representation.
if (info.layout != .Packed) return false;
const Backing = info.backing_integer orelse return false;
if (@bitSizeOf(Backing) > @bitSizeOf(c_uint)) return false;
const ptr: *c_uint = @ptrCast(@alignCast(ptr_raw));
ptr.* = @intCast(@as(Backing, @bitCast(value)));
},
else => return false,
},
}