diff options
Diffstat (limited to 'library/core')
| -rw-r--r-- | library/core/src/fmt/num.rs | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/library/core/src/fmt/num.rs b/library/core/src/fmt/num.rs index 4467b37bd45..ba30518d70b 100644 --- a/library/core/src/fmt/num.rs +++ b/library/core/src/fmt/num.rs @@ -208,7 +208,11 @@ macro_rules! impl_Display { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { #[cfg(not(feature = "optimize_for_size"))] { - self._fmt(true, f) + const MAX_DEC_N: usize = $unsigned::MAX.ilog(10) as usize + 1; + // Buffer decimals for $unsigned with right alignment. + let mut buf = [MaybeUninit::<u8>::uninit(); MAX_DEC_N]; + + f.pad_integral(true, "", self._fmt(&mut buf)) } #[cfg(feature = "optimize_for_size")] { @@ -222,7 +226,11 @@ macro_rules! impl_Display { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { #[cfg(not(feature = "optimize_for_size"))] { - return self.unsigned_abs()._fmt(*self >= 0, f); + const MAX_DEC_N: usize = $unsigned::MAX.ilog(10) as usize + 1; + // Buffer decimals for $unsigned with right alignment. + let mut buf = [MaybeUninit::<u8>::uninit(); MAX_DEC_N]; + + f.pad_integral(*self >= 0, "", self.unsigned_abs()._fmt(&mut buf)) } #[cfg(feature = "optimize_for_size")] { @@ -233,10 +241,13 @@ macro_rules! impl_Display { #[cfg(not(feature = "optimize_for_size"))] impl $unsigned { - fn _fmt(self, is_nonnegative: bool, f: &mut fmt::Formatter<'_>) -> fmt::Result { - const MAX_DEC_N: usize = $unsigned::MAX.ilog(10) as usize + 1; - // Buffer decimals for $unsigned with right alignment. - let mut buf = [MaybeUninit::<u8>::uninit(); MAX_DEC_N]; + #[doc(hidden)] + #[unstable( + feature = "fmt_internals", + reason = "specialized method meant to only be used by `SpecToString` implementation", + issue = "none" + )] + pub fn _fmt<'a>(self, buf: &'a mut [MaybeUninit::<u8>]) -> &'a str { // Count the number of bytes in buf that are not initialized. let mut offset = buf.len(); // Consume the least-significant decimals from a working copy. @@ -301,13 +312,12 @@ macro_rules! impl_Display { // SAFETY: All buf content since offset is set. let written = unsafe { buf.get_unchecked(offset..) }; // SAFETY: Writes use ASCII from the lookup table exclusively. - let as_str = unsafe { + unsafe { str::from_utf8_unchecked(slice::from_raw_parts( MaybeUninit::slice_as_ptr(written), written.len(), )) - }; - f.pad_integral(is_nonnegative, "", as_str) + } } })* |