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+mod exponent;
+mod mantissa;
+
+use self::exponent::*;
+use self::mantissa::*;
+use crate::common;
+use crate::d2s::{self, *};
+use crate::f2s::*;
+use core::ptr;
+#[cfg(feature = "no-panic")]
+use no_panic::no_panic;
+
+/// Print f64 to the given buffer and return number of bytes written.
+///
+/// At most 24 bytes will be written.
+///
+/// ## Special cases
+///
+/// This function **does not** check for NaN or infinity. If the input
+/// number is not a finite float, the printed representation will be some
+/// correctly formatted but unspecified numerical value.
+///
+/// Please check [`is_finite`] yourself before calling this function, or
+/// check [`is_nan`] and [`is_infinite`] and handle those cases yourself.
+///
+/// [`is_finite`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_finite
+/// [`is_nan`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_nan
+/// [`is_infinite`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_infinite
+///
+/// ## Safety
+///
+/// The `result` pointer argument must point to sufficiently many writable bytes
+/// to hold Ryū's representation of `f`.
+///
+/// ## Example
+///
+/// ```
+/// use std::{mem::MaybeUninit, slice, str};
+///
+/// let f = 1.234f64;
+///
+/// unsafe {
+/// let mut buffer = [MaybeUninit::<u8>::uninit(); 24];
+/// let len = ryu::raw::format64(f, buffer.as_mut_ptr() as *mut u8);
+/// let slice = slice::from_raw_parts(buffer.as_ptr() as *const u8, len);
+/// let print = str::from_utf8_unchecked(slice);
+/// assert_eq!(print, "1.234");
+/// }
+/// ```
+#[must_use]
+#[cfg_attr(feature = "no-panic", no_panic)]
+pub unsafe fn format64(f: f64, result: *mut u8) -> usize {
+ let bits = f.to_bits();
+ let sign = ((bits >> (DOUBLE_MANTISSA_BITS + DOUBLE_EXPONENT_BITS)) & 1) != 0;
+ let ieee_mantissa = bits & ((1u64 << DOUBLE_MANTISSA_BITS) - 1);
+ let ieee_exponent =
+ (bits >> DOUBLE_MANTISSA_BITS) as u32 & ((1u32 << DOUBLE_EXPONENT_BITS) - 1);
+
+ let mut index = 0isize;
+ if sign {
+ *result = b'-';
+ index += 1;
+ }
+
+ if ieee_exponent == 0 && ieee_mantissa == 0 {
+ ptr::copy_nonoverlapping(b"0.0".as_ptr(), result.offset(index), 3);
+ return sign as usize + 3;
+ }
+
+ let v = d2d(ieee_mantissa, ieee_exponent);
+
+ let length = d2s::decimal_length17(v.mantissa) as isize;
+ let k = v.exponent as isize;
+ let kk = length + k; // 10^(kk-1) <= v < 10^kk
+ debug_assert!(k >= -324);
+
+ if 0 <= k && kk <= 16 {
+ // 1234e7 -> 12340000000.0
+ write_mantissa_long(v.mantissa, result.offset(index + length));
+ for i in length..kk {
+ *result.offset(index + i) = b'0';
+ }
+ *result.offset(index + kk) = b'.';
+ *result.offset(index + kk + 1) = b'0';
+ index as usize + kk as usize + 2
+ } else if 0 < kk && kk <= 16 {
+ // 1234e-2 -> 12.34
+ write_mantissa_long(v.mantissa, result.offset(index + length + 1));
+ ptr::copy(result.offset(index + 1), result.offset(index), kk as usize);
+ *result.offset(index + kk) = b'.';
+ index as usize + length as usize + 1
+ } else if -5 < kk && kk <= 0 {
+ // 1234e-6 -> 0.001234
+ *result.offset(index) = b'0';
+ *result.offset(index + 1) = b'.';
+ let offset = 2 - kk;
+ for i in 2..offset {
+ *result.offset(index + i) = b'0';
+ }
+ write_mantissa_long(v.mantissa, result.offset(index + length + offset));
+ index as usize + length as usize + offset as usize
+ } else if length == 1 {
+ // 1e30
+ *result.offset(index) = b'0' + v.mantissa as u8;
+ *result.offset(index + 1) = b'e';
+ index as usize + 2 + write_exponent3(kk - 1, result.offset(index + 2))
+ } else {
+ // 1234e30 -> 1.234e33
+ write_mantissa_long(v.mantissa, result.offset(index + length + 1));
+ *result.offset(index) = *result.offset(index + 1);
+ *result.offset(index + 1) = b'.';
+ *result.offset(index + length + 1) = b'e';
+ index as usize
+ + length as usize
+ + 2
+ + write_exponent3(kk - 1, result.offset(index + length + 2))
+ }
+}
+
+/// Print f32 to the given buffer and return number of bytes written.
+///
+/// At most 16 bytes will be written.
+///
+/// ## Special cases
+///
+/// This function **does not** check for NaN or infinity. If the input
+/// number is not a finite float, the printed representation will be some
+/// correctly formatted but unspecified numerical value.
+///
+/// Please check [`is_finite`] yourself before calling this function, or
+/// check [`is_nan`] and [`is_infinite`] and handle those cases yourself.
+///
+/// [`is_finite`]: https://doc.rust-lang.org/std/primitive.f32.html#method.is_finite
+/// [`is_nan`]: https://doc.rust-lang.org/std/primitive.f32.html#method.is_nan
+/// [`is_infinite`]: https://doc.rust-lang.org/std/primitive.f32.html#method.is_infinite
+///
+/// ## Safety
+///
+/// The `result` pointer argument must point to sufficiently many writable bytes
+/// to hold Ryū's representation of `f`.
+///
+/// ## Example
+///
+/// ```
+/// use std::{mem::MaybeUninit, slice, str};
+///
+/// let f = 1.234f32;
+///
+/// unsafe {
+/// let mut buffer = [MaybeUninit::<u8>::uninit(); 16];
+/// let len = ryu::raw::format32(f, buffer.as_mut_ptr() as *mut u8);
+/// let slice = slice::from_raw_parts(buffer.as_ptr() as *const u8, len);
+/// let print = str::from_utf8_unchecked(slice);
+/// assert_eq!(print, "1.234");
+/// }
+/// ```
+#[must_use]
+#[cfg_attr(feature = "no-panic", no_panic)]
+pub unsafe fn format32(f: f32, result: *mut u8) -> usize {
+ let bits = f.to_bits();
+ let sign = ((bits >> (FLOAT_MANTISSA_BITS + FLOAT_EXPONENT_BITS)) & 1) != 0;
+ let ieee_mantissa = bits & ((1u32 << FLOAT_MANTISSA_BITS) - 1);
+ let ieee_exponent = (bits >> FLOAT_MANTISSA_BITS) & ((1u32 << FLOAT_EXPONENT_BITS) - 1);
+
+ let mut index = 0isize;
+ if sign {
+ *result = b'-';
+ index += 1;
+ }
+
+ if ieee_exponent == 0 && ieee_mantissa == 0 {
+ ptr::copy_nonoverlapping(b"0.0".as_ptr(), result.offset(index), 3);
+ return sign as usize + 3;
+ }
+
+ let v = f2d(ieee_mantissa, ieee_exponent);
+
+ let length = common::decimal_length9(v.mantissa) as isize;
+ let k = v.exponent as isize;
+ let kk = length + k; // 10^(kk-1) <= v < 10^kk
+ debug_assert!(k >= -45);
+
+ if 0 <= k && kk <= 13 {
+ // 1234e7 -> 12340000000.0
+ write_mantissa(v.mantissa, result.offset(index + length));
+ for i in length..kk {
+ *result.offset(index + i) = b'0';
+ }
+ *result.offset(index + kk) = b'.';
+ *result.offset(index + kk + 1) = b'0';
+ index as usize + kk as usize + 2
+ } else if 0 < kk && kk <= 13 {
+ // 1234e-2 -> 12.34
+ write_mantissa(v.mantissa, result.offset(index + length + 1));
+ ptr::copy(result.offset(index + 1), result.offset(index), kk as usize);
+ *result.offset(index + kk) = b'.';
+ index as usize + length as usize + 1
+ } else if -6 < kk && kk <= 0 {
+ // 1234e-6 -> 0.001234
+ *result.offset(index) = b'0';
+ *result.offset(index + 1) = b'.';
+ let offset = 2 - kk;
+ for i in 2..offset {
+ *result.offset(index + i) = b'0';
+ }
+ write_mantissa(v.mantissa, result.offset(index + length + offset));
+ index as usize + length as usize + offset as usize
+ } else if length == 1 {
+ // 1e30
+ *result.offset(index) = b'0' + v.mantissa as u8;
+ *result.offset(index + 1) = b'e';
+ index as usize + 2 + write_exponent2(kk - 1, result.offset(index + 2))
+ } else {
+ // 1234e30 -> 1.234e33
+ write_mantissa(v.mantissa, result.offset(index + length + 1));
+ *result.offset(index) = *result.offset(index + 1);
+ *result.offset(index + 1) = b'.';
+ *result.offset(index + length + 1) = b'e';
+ index as usize
+ + length as usize
+ + 2
+ + write_exponent2(kk - 1, result.offset(index + length + 2))
+ }
+}
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