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Handle sentinel slices in std.mem.zeroes

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Fixes #13256
This commit is contained in:
IntegratedQuantum 2022-11-09 16:33:48 +01:00 committed by Andrew Kelley
parent c1fc15f913
commit 11c1ddfc97
1 changed files with 10 additions and 1 deletions
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11
lib/std/mem.zig
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@ -285,7 +285,14 @@ pub fn zeroes(comptime T: type) T {
.Pointer => |ptr_info| {
switch (ptr_info.size) {
.Slice => {
return &[_]ptr_info.child{};
if (ptr_info.sentinel) |sentinel| {
if (ptr_info.child == u8 and @ptrCast(*const u8, sentinel).* == 0) {
return ""; // A special case for the most common use-case: null-terminated strings.
}
@compileError("Can't set a sentinel slice to zero. This would require allocating memory.");
} else {
return &[_]ptr_info.child{};
}
},
.C => {
return null;
@ -373,6 +380,7 @@ test "zeroes" {
optional: ?*u8,
c_pointer: [*c]u8,
slice: []u8,
nullTerminatedString: [:0]const u8,
},
array: [2]u32,
@ -403,6 +411,7 @@ test "zeroes" {
try testing.expectEqual(@as(?*u8, null), b.pointers.optional);
try testing.expectEqual(@as([*c]u8, null), b.pointers.c_pointer);
try testing.expectEqual(@as([]u8, &[_]u8{}), b.pointers.slice);
try testing.expectEqual(@as([:0]const u8, ""), b.pointers.nullTerminatedString);
for (b.array) |e| {
try testing.expectEqual(@as(u32, 0), e);
}