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std.io.Writer.writeStructEndian: fix packed structs

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Andrew Kelley 2025-07-09 19:04:21 -07:00
parent dce08d9a57
commit aa1bdb43e0
1 changed files with 17 additions and 6 deletions
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23
lib/std/io/Writer.zig
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@ -794,12 +794,23 @@ pub fn writeStruct(w: *Writer, value: anytype) Error!void {
/// comptime-known and matches host endianness. /// comptime-known and matches host endianness.
/// TODO: make sure this value is not a reference type /// TODO: make sure this value is not a reference type
pub inline fn writeStructEndian(w: *Writer, value: anytype, endian: std.builtin.Endian) Error!void { pub inline fn writeStructEndian(w: *Writer, value: anytype, endian: std.builtin.Endian) Error!void {
if (native_endian == endian) { switch (@typeInfo(@TypeOf(value))) {
return w.writeStruct(value); .@"struct" => |info| switch (info.layout) {
} else { .auto => @compileError("ill-defined memory layout"),
var copy = value; .@"extern" => {
std.mem.byteSwapAllFields(@TypeOf(value), &copy); if (native_endian == endian) {
return w.writeStruct(copy); return w.writeStruct(value);
} else {
var copy = value;
std.mem.byteSwapAllFields(@TypeOf(value), &copy);
return w.writeStruct(copy);
}
},
.@"packed" => {
return writeInt(w, info.backing_integer.?, @bitCast(value), endian);
},
},
else => @compileError("not a struct"),
} }
} }