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make writeIntSlice functions work for signed integers

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Matthew Borkowski 2021-05-22 14:03:06 -04:00 committed by Andrew Kelley
parent 97a2f4e7ae
commit 54f774f796
1 changed files with 26 additions and 2 deletions
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28
lib/std/mem.zig
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@ -1444,7 +1444,7 @@ pub fn writeIntSliceLittle(comptime T: type, buffer: []u8, value: T) void {
// TODO I want to call writeIntLittle here but comptime eval facilities aren't good enough
const uint = std.meta.Int(.unsigned, @typeInfo(T).Int.bits);
var bits = @truncate(uint, value);
var bits = @bitCast(uint, value);
for (buffer) |*b| {
b.* = @truncate(u8, bits);
bits >>= 8;
@ -1464,7 +1464,7 @@ pub fn writeIntSliceBig(comptime T: type, buffer: []u8, value: T) void {
// TODO I want to call writeIntBig here but comptime eval facilities aren't good enough
const uint = std.meta.Int(.unsigned, @typeInfo(T).Int.bits);
var bits = @truncate(uint, value);
var bits = @bitCast(uint, value);
var index: usize = buffer.len;
while (index != 0) {
index -= 1;
@ -2028,6 +2028,30 @@ fn testWriteIntImpl() !void {
0x00,
0x00,
}));
writeIntSlice(i16, bytes[0..], @as(i16, -21555), Endian.Little);
try testing.expect(eql(u8, &bytes, &[_]u8{
0xCD,
0xAB,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
}));
writeIntSlice(i16, bytes[0..], @as(i16, -21555), Endian.Big);
try testing.expect(eql(u8, &bytes, &[_]u8{
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0xAB,
0xCD,
}));
}
/// Returns the smallest number in a slice. O(n).