Convert strtold to Rust

build.rs

@@ -1,36 +0,0 @@
-extern crate cc;
-
-use std::{env, fs};
-
-fn get_target() -> String {
-    env::var("TARGET").unwrap_or(
-        option_env!("TARGET").map_or("x86_64-unknown-redox".to_string(), |x| x.to_string()),
-    )
-}
-
-fn main() {
-    let _crate_dir = env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR not set");
-    let target = get_target();
-
-    println!("cargo:rerun-if-changed=src/c");
-
-    let mut cc_builder = &mut cc::Build::new();
-
-    cc_builder = cc_builder.flag("-nostdinc").flag("-nostdlib");
-
-    if target.starts_with("aarch64") {
-        cc_builder = cc_builder.flag("-mno-outline-atomics")
-    }
-
-    cc_builder
-        .flag("-fno-stack-protector")
-        .flag("-Wno-expansion-to-defined")
-        .files(
-            fs::read_dir("src/c")
-                .expect("src/c directory missing")
-                .map(|res| res.expect("read_dir error").path()),
-        )
-        .compile("relibc_c");
-
-    println!("cargo:rustc-link-lib=static=relibc_c");
-}

src/c/stdlib.c

@@ -1,5 +0,0 @@
-double strtod(const char *nptr, char **endptr);
-
-long double strtold(const char *nptr, char **endptr) {
-    return (long double)strtod(nptr, endptr);
-}

src/header/stdlib/cbindgen.toml

@@ -6,5 +6,8 @@ style = "Type"
 no_includes = true
 cpp_compat = true
 
+[export.rename]
+"c_longdouble" = "long double"
+
 [enum]
 prefix_with_name = true

src/header/stdlib/mod.rs

@@ -1479,7 +1479,11 @@ pub unsafe extern "C" fn strtol(s: *const c_char, endptr: *mut *mut c_char, base
     )
 }
 
-// TODO: strtold(), when long double is available
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/strtold.html>.
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn strtold(s: *const c_char, endptr: *mut *mut c_char) -> c_longdouble {
+    strto_float_impl!(c_longdouble, s, endptr)
+}
 
 /// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/strtol.html>.
 #[unsafe(no_mangle)]

src/lib.rs

@@ -16,6 +16,7 @@
 #![feature(asm_const)]
 #![feature(c_variadic)]
 #![feature(core_intrinsics)]
+#![feature(f128)]
 #![feature(macro_derive)]
 #![feature(maybe_uninit_slice)]
 #![feature(lang_items)]

src/platform/types.rs

@@ -31,6 +31,7 @@ pub type c_int = i32;
 pub type c_uint = u32;
 pub type c_float = f32;
 pub type c_double = f64;
+pub type c_longdouble = f128;
 pub type c_longlong = i64;
 pub type c_ulonglong = u64;
 pub type intmax_t = i64;