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behavior tests: remove "variadic functions" dependency on std lib

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This commit is contained in:
Andrew Kelley 2025-08-27 15:17:55 -07:00
parent ea3471288a
commit 4f510dba10
1 changed files with 21 additions and 14 deletions
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35
test/behavior/var_args.zig
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@ -200,35 +200,42 @@ test "variadic functions" {
if (builtin.cpu.arch.isSPARC() and builtin.zig_backend == .stage2_llvm) return error.SkipZigTest; // https://github.com/ziglang/zig/issues/23718
const S = struct {
fn printf(list_ptr: *std.array_list.Managed(u8), format: [*:0]const u8, ...) callconv(.c) void {
fn printf(buffer: [*]u8, format: [*:0]const u8, ...) callconv(.c) void {
var ap = @cVaStart();
defer @cVaEnd(&ap);
vprintf(list_ptr, format, &ap);
vprintf(buffer, format, &ap);
}
fn vprintf(
list: *std.array_list.Managed(u8),
format: [*:0]const u8,
ap: *std.builtin.VaList,
) callconv(.c) void {
for (std.mem.span(format)) |c| switch (c) {
fn vprintf(buffer: [*]u8, format: [*:0]const u8, ap: *std.builtin.VaList) callconv(.c) void {
var i: usize = 0;
for (format[0..3]) |byte| switch (byte) {
's' => {
const arg = @cVaArg(ap, [*:0]const u8);
list.writer().print("{s}", .{arg}) catch return;
buffer[i..][0..5].* = arg[0..5].*;
i += 5;
},
'd' => {
const arg = @cVaArg(ap, c_int);
list.writer().print("{d}", .{arg}) catch return;
switch (arg) {
1 => {
buffer[i] = '1';
i += 1;
},
5 => {
buffer[i] = '5';
i += 1;
},
else => unreachable,
}
},
else => unreachable,
};
}
};
var list = std.array_list.Managed(u8).init(std.testing.allocator);
defer list.deinit();
S.printf(&list, "dsd", @as(c_int, 1), @as([*:0]const u8, "hello"), @as(c_int, 5));
try std.testing.expectEqualStrings("1hello5", list.items);
var buffer: [7]u8 = undefined;
S.printf(&buffer, "dsd", @as(c_int, 1), @as([*:0]const u8, "hello"), @as(c_int, 5));
try expect(std.mem.eql(u8, &buffer, "1hello5"));
}
test "copy VaList" {