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//! Stream operations
const kata = @import("kata");
const sys = @import("sys");
const types = @import("types.zig");
const ERROR_RESULT: u64 = @bitCast(@as(i64, -1));
const EAGAIN_RESULT: u64 = @bitCast(@as(i64, -2));
pub fn view(fd: types.Descriptor, buffer: []u8) types.Error!usize {
const result = sys.syscall(.view, .{ fd, @intFromPtr(buffer.ptr), buffer.len });
if (result == ERROR_RESULT) {
return types.Error.ReadFailed;
}
return result;
}
pub fn mark(fd: types.Descriptor, data: []const u8, color: u32) types.Error!usize {
const result = sys.syscall(.mark, .{ fd, @intFromPtr(data.ptr), data.len, color });
if (result == ERROR_RESULT) {
return types.Error.WriteFailed;
}
return result;
}
pub fn getchar() types.Error!u8 {
while (true) {
const result = sys.syscall(.getkeychar, .{});
if (result != EAGAIN_RESULT) {
if (result != ERROR_RESULT) {
return @truncate(result);
}
return types.Error.ReadFailed;
}
kata.yield();
}
}
pub fn wipe() void {
_ = sys.syscall(.wipe, .{});
}
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