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const std = @import("std");
const builtin = @import("builtin");
const expect = std.testing.expect;
test "memmove and memset intrinsics" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
try testMemmoveMemset();
try comptime testMemmoveMemset();
}
fn testMemmoveMemset() !void {
var foo: [20]u8 = undefined;
@memset(foo[0..10], 'A');
@memset(foo[10..20], 'B');
try expect(foo[0] == 'A');
try expect(foo[11] == 'B');
try expect(foo[19] == 'B');
@memmove(foo[10..20], foo[0..10]);
try expect(foo[0] == 'A');
try expect(foo[11] == 'A');
try expect(foo[19] == 'A');
}
test "@memmove with both operands single-ptr-to-array, one is null-terminated" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
try testMemmoveBothSinglePtrArrayOneIsNullTerminated();
try comptime testMemmoveBothSinglePtrArrayOneIsNullTerminated();
}
fn testMemmoveBothSinglePtrArrayOneIsNullTerminated() !void {
var buf: [100]u8 = undefined;
const suffix = "hello";
@memmove(buf[buf.len - suffix.len ..], suffix);
try expect(buf[95] == 'h');
try expect(buf[96] == 'e');
try expect(buf[97] == 'l');
try expect(buf[98] == 'l');
try expect(buf[99] == 'o');
const start = buf.len - suffix.len - 3;
const end = start + suffix.len;
@memmove(buf[start..end], buf[buf.len - suffix.len ..]);
try expect(buf[92] == 'h');
try expect(buf[93] == 'e');
try expect(buf[94] == 'l');
try expect(buf[95] == 'l');
try expect(buf[96] == 'o');
try expect(buf[97] == 'l');
try expect(buf[98] == 'l');
try expect(buf[99] == 'o');
@memmove(buf[start + 2 .. end + 2], buf[start..end]);
try expect(buf[92] == 'h');
try expect(buf[93] == 'e');
try expect(buf[94] == 'h');
try expect(buf[95] == 'e');
try expect(buf[96] == 'l');
try expect(buf[97] == 'l');
try expect(buf[98] == 'o');
try expect(buf[99] == 'o');
}
test "@memmove dest many pointer" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
try testMemmoveDestManyPtr();
try comptime testMemmoveDestManyPtr();
}
fn testMemmoveDestManyPtr() !void {
var str = "hello".*;
var buf: [8]u8 = undefined;
var len: usize = 5;
_ = &len;
@memmove(@as([*]u8, @ptrCast(&buf)), @as([*]const u8, @ptrCast(&str))[0..len]);
try expect(buf[0] == 'h');
try expect(buf[1] == 'e');
try expect(buf[2] == 'l');
try expect(buf[3] == 'l');
try expect(buf[4] == 'o');
@memmove(buf[3..].ptr, buf[0..len]);
try expect(buf[0] == 'h');
try expect(buf[1] == 'e');
try expect(buf[2] == 'l');
try expect(buf[3] == 'h');
try expect(buf[4] == 'e');
try expect(buf[5] == 'l');
try expect(buf[6] == 'l');
try expect(buf[7] == 'o');
@memmove(buf[2..7].ptr, buf[3 .. len + 3]);
try expect(buf[0] == 'h');
try expect(buf[1] == 'e');
try expect(buf[2] == 'h');
try expect(buf[3] == 'e');
try expect(buf[4] == 'l');
try expect(buf[5] == 'l');
try expect(buf[6] == 'o');
try expect(buf[7] == 'o');
}
test "@memmove slice" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
try testMemmoveSlice();
try comptime testMemmoveSlice();
}
fn testMemmoveSlice() !void {
var buf: [8]u8 = undefined;
const dst1: []u8 = buf[0..5];
const dst2: []u8 = buf[3..8];
const dst3: []u8 = buf[2..7];
const src: []const u8 = "hello";
@memmove(dst1, src);
try expect(buf[0] == 'h');
try expect(buf[1] == 'e');
try expect(buf[2] == 'l');
try expect(buf[3] == 'l');
try expect(buf[4] == 'o');
@memmove(dst2, dst1);
try expect(buf[0] == 'h');
try expect(buf[1] == 'e');
try expect(buf[2] == 'l');
try expect(buf[3] == 'h');
try expect(buf[4] == 'e');
try expect(buf[5] == 'l');
try expect(buf[6] == 'l');
try expect(buf[7] == 'o');
@memmove(dst3, dst2);
try expect(buf[0] == 'h');
try expect(buf[1] == 'e');
try expect(buf[2] == 'h');
try expect(buf[3] == 'e');
try expect(buf[4] == 'l');
try expect(buf[5] == 'l');
try expect(buf[6] == 'o');
try expect(buf[7] == 'o');
}
comptime {
const S = struct {
buffer: [8]u8 = undefined,
fn set(self: *@This(), items: []const u8) void {
@memmove(self.buffer[0..items.len], items);
@memmove(self.buffer[3..], self.buffer[0..items.len]);
@memmove(self.buffer[2 .. 2 + items.len], self.buffer[3..]);
}
};
var s = S{};
s.set("hello");
if (!std.mem.eql(u8, s.buffer[0..8], "hehelloo")) @compileError("bad");
}
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