| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/ryu-1.0.13/src/pretty/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../ryu/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../ryu/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">mod </span>exponent; |
| <span class="kw">mod </span>mantissa; |
| |
| <span class="kw">use </span><span class="self">self</span>::exponent::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="self">self</span>::mantissa::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::common; |
| <span class="kw">use </span><span class="kw">crate</span>::d2s::{<span class="self">self</span>, <span class="kw-2">*</span>}; |
| <span class="kw">use </span><span class="kw">crate</span>::f2s::<span class="kw-2">*</span>; |
| <span class="kw">use </span>core::ptr; |
| <span class="attribute">#[cfg(feature = <span class="string">"no-panic"</span>)] |
| </span><span class="kw">use </span>no_panic::no_panic; |
| |
| <span class="doccomment">/// 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"); |
| /// } |
| /// ``` |
| </span><span class="attribute">#[must_use] |
| #[cfg_attr(feature = <span class="string">"no-panic"</span>, no_panic)] |
| </span><span class="kw">pub unsafe fn </span>format64(f: f64, result: <span class="kw-2">*mut </span>u8) -> usize { |
| <span class="kw">let </span>bits = f.to_bits(); |
| <span class="kw">let </span>sign = ((bits >> (DOUBLE_MANTISSA_BITS + DOUBLE_EXPONENT_BITS)) & <span class="number">1</span>) != <span class="number">0</span>; |
| <span class="kw">let </span>ieee_mantissa = bits & ((<span class="number">1u64 </span><< DOUBLE_MANTISSA_BITS) - <span class="number">1</span>); |
| <span class="kw">let </span>ieee_exponent = |
| (bits >> DOUBLE_MANTISSA_BITS) <span class="kw">as </span>u32 & ((<span class="number">1u32 </span><< DOUBLE_EXPONENT_BITS) - <span class="number">1</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>index = <span class="number">0isize</span>; |
| <span class="kw">if </span>sign { |
| <span class="kw-2">*</span>result = <span class="string">b'-'</span>; |
| index += <span class="number">1</span>; |
| } |
| |
| <span class="kw">if </span>ieee_exponent == <span class="number">0 </span>&& ieee_mantissa == <span class="number">0 </span>{ |
| ptr::copy_nonoverlapping(<span class="string">b"0.0"</span>.as_ptr(), result.offset(index), <span class="number">3</span>); |
| <span class="kw">return </span>sign <span class="kw">as </span>usize + <span class="number">3</span>; |
| } |
| |
| <span class="kw">let </span>v = d2d(ieee_mantissa, ieee_exponent); |
| |
| <span class="kw">let </span>length = d2s::decimal_length17(v.mantissa) <span class="kw">as </span>isize; |
| <span class="kw">let </span>k = v.exponent <span class="kw">as </span>isize; |
| <span class="kw">let </span>kk = length + k; <span class="comment">// 10^(kk-1) <= v < 10^kk |
| </span><span class="macro">debug_assert!</span>(k >= -<span class="number">324</span>); |
| |
| <span class="kw">if </span><span class="number">0 </span><= k && kk <= <span class="number">16 </span>{ |
| <span class="comment">// 1234e7 -> 12340000000.0 |
| </span>write_mantissa_long(v.mantissa, result.offset(index + length)); |
| <span class="kw">for </span>i <span class="kw">in </span>length..kk { |
| <span class="kw-2">*</span>result.offset(index + i) = <span class="string">b'0'</span>; |
| } |
| <span class="kw-2">*</span>result.offset(index + kk) = <span class="string">b'.'</span>; |
| <span class="kw-2">*</span>result.offset(index + kk + <span class="number">1</span>) = <span class="string">b'0'</span>; |
| index <span class="kw">as </span>usize + kk <span class="kw">as </span>usize + <span class="number">2 |
| </span>} <span class="kw">else if </span><span class="number">0 </span>< kk && kk <= <span class="number">16 </span>{ |
| <span class="comment">// 1234e-2 -> 12.34 |
| </span>write_mantissa_long(v.mantissa, result.offset(index + length + <span class="number">1</span>)); |
| ptr::copy(result.offset(index + <span class="number">1</span>), result.offset(index), kk <span class="kw">as </span>usize); |
| <span class="kw-2">*</span>result.offset(index + kk) = <span class="string">b'.'</span>; |
| index <span class="kw">as </span>usize + length <span class="kw">as </span>usize + <span class="number">1 |
| </span>} <span class="kw">else if </span>-<span class="number">5 </span>< kk && kk <= <span class="number">0 </span>{ |
| <span class="comment">// 1234e-6 -> 0.001234 |
| </span><span class="kw-2">*</span>result.offset(index) = <span class="string">b'0'</span>; |
| <span class="kw-2">*</span>result.offset(index + <span class="number">1</span>) = <span class="string">b'.'</span>; |
| <span class="kw">let </span>offset = <span class="number">2 </span>- kk; |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">2</span>..offset { |
| <span class="kw-2">*</span>result.offset(index + i) = <span class="string">b'0'</span>; |
| } |
| write_mantissa_long(v.mantissa, result.offset(index + length + offset)); |
| index <span class="kw">as </span>usize + length <span class="kw">as </span>usize + offset <span class="kw">as </span>usize |
| } <span class="kw">else if </span>length == <span class="number">1 </span>{ |
| <span class="comment">// 1e30 |
| </span><span class="kw-2">*</span>result.offset(index) = <span class="string">b'0' </span>+ v.mantissa <span class="kw">as </span>u8; |
| <span class="kw-2">*</span>result.offset(index + <span class="number">1</span>) = <span class="string">b'e'</span>; |
| index <span class="kw">as </span>usize + <span class="number">2 </span>+ write_exponent3(kk - <span class="number">1</span>, result.offset(index + <span class="number">2</span>)) |
| } <span class="kw">else </span>{ |
| <span class="comment">// 1234e30 -> 1.234e33 |
| </span>write_mantissa_long(v.mantissa, result.offset(index + length + <span class="number">1</span>)); |
| <span class="kw-2">*</span>result.offset(index) = <span class="kw-2">*</span>result.offset(index + <span class="number">1</span>); |
| <span class="kw-2">*</span>result.offset(index + <span class="number">1</span>) = <span class="string">b'.'</span>; |
| <span class="kw-2">*</span>result.offset(index + length + <span class="number">1</span>) = <span class="string">b'e'</span>; |
| index <span class="kw">as </span>usize |
| + length <span class="kw">as </span>usize |
| + <span class="number">2 |
| </span>+ write_exponent3(kk - <span class="number">1</span>, result.offset(index + length + <span class="number">2</span>)) |
| } |
| } |
| |
| <span class="doccomment">/// 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"); |
| /// } |
| /// ``` |
| </span><span class="attribute">#[must_use] |
| #[cfg_attr(feature = <span class="string">"no-panic"</span>, no_panic)] |
| </span><span class="kw">pub unsafe fn </span>format32(f: f32, result: <span class="kw-2">*mut </span>u8) -> usize { |
| <span class="kw">let </span>bits = f.to_bits(); |
| <span class="kw">let </span>sign = ((bits >> (FLOAT_MANTISSA_BITS + FLOAT_EXPONENT_BITS)) & <span class="number">1</span>) != <span class="number">0</span>; |
| <span class="kw">let </span>ieee_mantissa = bits & ((<span class="number">1u32 </span><< FLOAT_MANTISSA_BITS) - <span class="number">1</span>); |
| <span class="kw">let </span>ieee_exponent = (bits >> FLOAT_MANTISSA_BITS) & ((<span class="number">1u32 </span><< FLOAT_EXPONENT_BITS) - <span class="number">1</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>index = <span class="number">0isize</span>; |
| <span class="kw">if </span>sign { |
| <span class="kw-2">*</span>result = <span class="string">b'-'</span>; |
| index += <span class="number">1</span>; |
| } |
| |
| <span class="kw">if </span>ieee_exponent == <span class="number">0 </span>&& ieee_mantissa == <span class="number">0 </span>{ |
| ptr::copy_nonoverlapping(<span class="string">b"0.0"</span>.as_ptr(), result.offset(index), <span class="number">3</span>); |
| <span class="kw">return </span>sign <span class="kw">as </span>usize + <span class="number">3</span>; |
| } |
| |
| <span class="kw">let </span>v = f2d(ieee_mantissa, ieee_exponent); |
| |
| <span class="kw">let </span>length = common::decimal_length9(v.mantissa) <span class="kw">as </span>isize; |
| <span class="kw">let </span>k = v.exponent <span class="kw">as </span>isize; |
| <span class="kw">let </span>kk = length + k; <span class="comment">// 10^(kk-1) <= v < 10^kk |
| </span><span class="macro">debug_assert!</span>(k >= -<span class="number">45</span>); |
| |
| <span class="kw">if </span><span class="number">0 </span><= k && kk <= <span class="number">13 </span>{ |
| <span class="comment">// 1234e7 -> 12340000000.0 |
| </span>write_mantissa(v.mantissa, result.offset(index + length)); |
| <span class="kw">for </span>i <span class="kw">in </span>length..kk { |
| <span class="kw-2">*</span>result.offset(index + i) = <span class="string">b'0'</span>; |
| } |
| <span class="kw-2">*</span>result.offset(index + kk) = <span class="string">b'.'</span>; |
| <span class="kw-2">*</span>result.offset(index + kk + <span class="number">1</span>) = <span class="string">b'0'</span>; |
| index <span class="kw">as </span>usize + kk <span class="kw">as </span>usize + <span class="number">2 |
| </span>} <span class="kw">else if </span><span class="number">0 </span>< kk && kk <= <span class="number">13 </span>{ |
| <span class="comment">// 1234e-2 -> 12.34 |
| </span>write_mantissa(v.mantissa, result.offset(index + length + <span class="number">1</span>)); |
| ptr::copy(result.offset(index + <span class="number">1</span>), result.offset(index), kk <span class="kw">as </span>usize); |
| <span class="kw-2">*</span>result.offset(index + kk) = <span class="string">b'.'</span>; |
| index <span class="kw">as </span>usize + length <span class="kw">as </span>usize + <span class="number">1 |
| </span>} <span class="kw">else if </span>-<span class="number">6 </span>< kk && kk <= <span class="number">0 </span>{ |
| <span class="comment">// 1234e-6 -> 0.001234 |
| </span><span class="kw-2">*</span>result.offset(index) = <span class="string">b'0'</span>; |
| <span class="kw-2">*</span>result.offset(index + <span class="number">1</span>) = <span class="string">b'.'</span>; |
| <span class="kw">let </span>offset = <span class="number">2 </span>- kk; |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">2</span>..offset { |
| <span class="kw-2">*</span>result.offset(index + i) = <span class="string">b'0'</span>; |
| } |
| write_mantissa(v.mantissa, result.offset(index + length + offset)); |
| index <span class="kw">as </span>usize + length <span class="kw">as </span>usize + offset <span class="kw">as </span>usize |
| } <span class="kw">else if </span>length == <span class="number">1 </span>{ |
| <span class="comment">// 1e30 |
| </span><span class="kw-2">*</span>result.offset(index) = <span class="string">b'0' </span>+ v.mantissa <span class="kw">as </span>u8; |
| <span class="kw-2">*</span>result.offset(index + <span class="number">1</span>) = <span class="string">b'e'</span>; |
| index <span class="kw">as </span>usize + <span class="number">2 </span>+ write_exponent2(kk - <span class="number">1</span>, result.offset(index + <span class="number">2</span>)) |
| } <span class="kw">else </span>{ |
| <span class="comment">// 1234e30 -> 1.234e33 |
| </span>write_mantissa(v.mantissa, result.offset(index + length + <span class="number">1</span>)); |
| <span class="kw-2">*</span>result.offset(index) = <span class="kw-2">*</span>result.offset(index + <span class="number">1</span>); |
| <span class="kw-2">*</span>result.offset(index + <span class="number">1</span>) = <span class="string">b'.'</span>; |
| <span class="kw-2">*</span>result.offset(index + length + <span class="number">1</span>) = <span class="string">b'e'</span>; |
| index <span class="kw">as </span>usize |
| + length <span class="kw">as </span>usize |
| + <span class="number">2 |
| </span>+ write_exponent2(kk - <span class="number">1</span>, result.offset(index + length + <span class="number">2</span>)) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="ryu" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
