bcmp.zig (874B) - Raw
1 const std = @import("std"); 2 const common = @import("./common.zig"); 3 4 comptime { 5 @export(&bcmp, .{ .name = "bcmp", .linkage = common.linkage, .visibility = common.visibility }); 6 } 7 8 pub fn bcmp(vl: [*]allowzero const u8, vr: [*]allowzero const u8, n: usize) callconv(.c) c_int { 9 @setRuntimeSafety(false); 10 11 var index: usize = 0; 12 while (index != n) : (index += 1) { 13 if (vl[index] != vr[index]) { 14 return 1; 15 } 16 } 17 18 return 0; 19 } 20 21 test "bcmp" { 22 const base_arr = &[_]u8{ 1, 1, 1 }; 23 const arr1 = &[_]u8{ 1, 1, 1 }; 24 const arr2 = &[_]u8{ 1, 0, 1 }; 25 const arr3 = &[_]u8{ 1, 2, 1 }; 26 27 try std.testing.expect(bcmp(base_arr[0..], arr1[0..], base_arr.len) == 0); 28 try std.testing.expect(bcmp(base_arr[0..], arr2[0..], base_arr.len) != 0); 29 try std.testing.expect(bcmp(base_arr[0..], arr3[0..], base_arr.len) != 0); 30 }