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Use stack fallback allocator to usually avoid extra heap allocation in getEnvVarOwned

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This commit is contained in:
Ryan Liptak 2024-02-09 19:28:57 -08:00
parent 68b87918df
commit abd250bb9c
1 changed files with 4 additions and 2 deletions
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6
lib/std/process.zig
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@ -393,8 +393,10 @@ pub const GetEnvVarOwnedError = error{
pub fn getEnvVarOwned(allocator: Allocator, key: []const u8) GetEnvVarOwnedError![]u8 {
if (builtin.os.tag == .windows) {
const result_w = blk: {
const key_w = try std.unicode.wtf8ToWtf16LeAllocZ(allocator, key);
defer allocator.free(key_w);
var stack_alloc = std.heap.stackFallback(256 * @sizeOf(u16), allocator);
const stack_allocator = stack_alloc.get();
const key_w = try std.unicode.wtf8ToWtf16LeAllocZ(stack_allocator, key);
defer stack_allocator.free(key_w);
break :blk std.os.getenvW(key_w) orelse return error.EnvironmentVariableNotFound;
};