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Clean up serialize_display_bounded_length

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David Tolnay 2017-04-13 16:36:24 -07:00
parent f45b83f0c1
commit fb7964fde7
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1 changed files with 20 additions and 26 deletions
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46
serde/src/ser/impls.rs
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@ -369,34 +369,30 @@ impl Serialize for Duration {
////////////////////////////////////////////////////////////////////////////////
/// Seralize the `$value` that implements Display as a string,
/// when that string is statically known to never have more than
/// a constant `$MAX_LEN` bytes.
/// Serialize a value that implements `Display` as a string, when that string is
/// statically known to never have more than a constant `MAX_LEN` bytes.
///
/// Panics if the Display impl tries to write more than `$MAX_LEN` bytes.
/// Panics if the `Display` impl tries to write more than `MAX_LEN` bytes.
#[cfg(feature = "std")]
macro_rules! serialize_display_bounded_length {
($value: expr, $MAX_LEN: expr, $serializer: expr) => {
{
let mut buffer: [u8; $MAX_LEN] = unsafe { mem::uninitialized() };
let remaining_len;
{
let mut remaining = &mut buffer[..];
write!(remaining, "{}", $value).unwrap();
remaining_len = remaining.len()
}
let written_len = buffer.len() - remaining_len;
let written = &buffer[..written_len];
($value:expr, $max:expr, $serializer:expr) => {{
let mut buffer: [u8; $max] = unsafe { mem::uninitialized() };
let remaining_len = {
let mut remaining = &mut buffer[..];
write!(remaining, "{}", $value).unwrap();
remaining.len()
};
let written_len = buffer.len() - remaining_len;
let written = &buffer[..written_len];
// write! only provides fmt::Formatter to Display implementations,
// which has methods write_str and write_char but no method to write arbitrary bytes.
// Therefore, `written` is well-formed in UTF-8.
let written_str = unsafe {
str::from_utf8_unchecked(written)
};
$serializer.serialize_str(written_str)
}
}
// write! only provides fmt::Formatter to Display implementations, which
// has methods write_str and write_char but no method to write arbitrary
// bytes. Therefore `written` must be valid UTF-8.
let written_str = unsafe {
str::from_utf8_unchecked(written)
};
$serializer.serialize_str(written_str)
}}
}
#[cfg(feature = "std")]
@ -436,8 +432,6 @@ impl Serialize for net::Ipv6Addr {
}
}
////////////////////////////////////////////////////////////////////////////////
#[cfg(feature = "std")]
impl Serialize for net::SocketAddr {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>