Copy definitions from core::ffi and centralize them

(backport <#4256>)
(cherry picked from commit 95446f4)

[ include the necessary changes for psp, which isn't part of the
  original commit since the target is not present on main - Trevor ]

Author: pheki

src/fuchsia/mod.rs

@@ -7,16 +7,6 @@ use crate::prelude::*;
 
 // PUB_TYPE
 
-pub type c_schar = i8;
-pub type c_uchar = u8;
-pub type c_short = i16;
-pub type c_ushort = u16;
-pub type c_int = i32;
-pub type c_uint = u32;
-pub type c_float = f32;
-pub type c_double = f64;
-pub type c_longlong = i64;
-pub type c_ulonglong = u64;
 pub type intmax_t = i64;
 pub type uintmax_t = u64;
 
@@ -88,9 +78,6 @@ pub type fsblkcnt_t = c_ulonglong;
 pub type fsfilcnt_t = c_ulonglong;
 pub type rlim_t = c_ulonglong;
 
-pub type c_long = i64;
-pub type c_ulong = u64;
-
 // FIXME(fuchsia): why are these uninhabited types? that seems... wrong?
 // Presumably these should be `()` or an `extern type` (when that stabilizes).
 #[cfg_attr(feature = "extra_traits", derive(Debug))]

src/hermit.rs

@@ -2,24 +2,11 @@
 
 use crate::prelude::*;
 
-pub type c_schar = i8;
-pub type c_uchar = u8;
-pub type c_short = i16;
-pub type c_ushort = u16;
-pub type c_int = i32;
-pub type c_uint = u32;
-pub type c_long = i64;
-pub type c_ulong = u64;
-pub type c_longlong = i64;
-pub type c_ulonglong = u64;
 pub type intmax_t = i64;
 pub type uintmax_t = u64;
 pub type intptr_t = isize;
 pub type uintptr_t = usize;
 
-pub type c_float = f32;
-pub type c_double = f64;
-
 pub type size_t = usize;
 pub type ssize_t = isize;
 pub type ptrdiff_t = isize;

src/lib.rs

@@ -41,138 +41,106 @@ cfg_if! {
 
 pub use core::ffi::c_void;
 
-cfg_if! {
-    // This configuration comes from `rust-lang/rust` in `library/core/src/ffi/mod.rs`.
-    if #[cfg(all(
-        not(windows),
-        // FIXME(ctest): just use `target_vendor` = "apple"` once `ctest` supports it
-        not(any(
-            target_os = "macos",
-            target_os = "ios",
-            target_os = "tvos",
-            target_os = "watchos",
-            target_os = "visionos",
-        )),
-        any(
-            target_arch = "aarch64",
-            target_arch = "arm",
-            target_arch = "csky",
-            target_arch = "hexagon",
-            target_arch = "msp430",
-            target_arch = "powerpc",
-            target_arch = "powerpc64",
-            target_arch = "riscv64",
-            target_arch = "riscv32",
-            target_arch = "s390x",
-            target_arch = "xtensa",
-        )
-    ))] {
-        pub type c_char = u8;
-    } else {
-        pub type c_char = i8;
-    }
-}
-
 cfg_if! {
     if #[cfg(windows)] {
-        mod fixed_width_ints;
-        pub use crate::fixed_width_ints::*;
+        mod primitives;
+        pub use crate::primitives::*;
 
         mod windows;
         pub use crate::windows::*;
 
         prelude!();
     } else if #[cfg(target_os = "fuchsia")] {
-        mod fixed_width_ints;
-        pub use crate::fixed_width_ints::*;
+        mod primitives;
+        pub use crate::primitives::*;
 
         mod fuchsia;
         pub use crate::fuchsia::*;
 
         prelude!();
     } else if #[cfg(target_os = "switch")] {
-        mod fixed_width_ints;
-        pub use fixed_width_ints::*;
+        mod primitives;
+        pub use primitives::*;
 
         mod switch;
         pub use switch::*;
 
         prelude!();
     } else if #[cfg(target_os = "psp")] {
-        mod fixed_width_ints;
-        pub use crate::fixed_width_ints::*;
+        mod primitives;
+        pub use primitives::*;
 
         mod psp;
         pub use crate::psp::*;
 
         prelude!();
     } else if #[cfg(target_os = "vxworks")] {
-        mod fixed_width_ints;
-        pub use crate::fixed_width_ints::*;
+        mod primitives;
+        pub use crate::primitives::*;
 
         mod vxworks;
         pub use crate::vxworks::*;
 
         prelude!();
     } else if #[cfg(target_os = "solid_asp3")] {
-        mod fixed_width_ints;
-        pub use crate::fixed_width_ints::*;
+        mod primitives;
+        pub use crate::primitives::*;
 
         mod solid;
         pub use crate::solid::*;
 
         prelude!();
     } else if #[cfg(unix)] {
-        mod fixed_width_ints;
-        pub use crate::fixed_width_ints::*;
+        mod primitives;
+        pub use crate::primitives::*;
 
         mod unix;
         pub use crate::unix::*;
 
         prelude!();
     } else if #[cfg(target_os = "hermit")] {
-        mod fixed_width_ints;
-        pub use crate::fixed_width_ints::*;
+        mod primitives;
+        pub use crate::primitives::*;
 
         mod hermit;
         pub use crate::hermit::*;
 
         prelude!();
     } else if #[cfg(target_os = "teeos")] {
-        mod fixed_width_ints;
-        pub use fixed_width_ints::*;
+        mod primitives;
+        pub use primitives::*;
 
         mod teeos;
         pub use teeos::*;
 
         prelude!();
     } else if #[cfg(target_os = "trusty")] {
-        mod fixed_width_ints;
-        pub use crate::fixed_width_ints::*;
+        mod primitives;
+        pub use crate::primitives::*;
 
         mod trusty;
         pub use crate::trusty::*;
 
         prelude!();
     } else if #[cfg(all(target_env = "sgx", target_vendor = "fortanix"))] {
-        mod fixed_width_ints;
-        pub use crate::fixed_width_ints::*;
+        mod primitives;
+        pub use crate::primitives::*;
 
         mod sgx;
         pub use crate::sgx::*;
 
         prelude!();
     } else if #[cfg(any(target_env = "wasi", target_os = "wasi"))] {
-        mod fixed_width_ints;
-        pub use crate::fixed_width_ints::*;
+        mod primitives;
+        pub use crate::primitives::*;
 
         mod wasi;
         pub use crate::wasi::*;
 
         prelude!();
     } else if #[cfg(target_os = "xous")] {
-        mod fixed_width_ints;
-        pub use crate::fixed_width_ints::*;
+        mod primitives;
+        pub use crate::primitives::*;
 
         mod xous;
         pub use crate::xous::*;

src/fixed_width_ints.rs renamed to src/primitives.rs

@@ -1,6 +1,67 @@
-//! This module contains type aliases for C's fixed-width integer types .
+//! This module contains type aliases for C's platform-specific types
+//! and fixed-width integer types.
 //!
-//! These aliases are deprecated: use the Rust types instead.
+//! The platform-specific types definitions were taken from rust-lang/rust in
+//! library/core/src/ffi/primitives.rs
+//!
+//! The fixed-width integer aliases are deprecated: use the Rust types instead.
+
+pub type c_schar = i8;
+pub type c_uchar = u8;
+pub type c_short = i16;
+pub type c_ushort = u16;
+
+pub type c_longlong = i64;
+pub type c_ulonglong = u64;
+
+pub type c_float = f32;
+pub type c_double = f64;
+
+cfg_if! {
+    if #[cfg(all(
+        not(windows),
+        not(target_vendor = "apple"),
+        any(
+            target_arch = "aarch64",
+            target_arch = "arm",
+            target_arch = "csky",
+            target_arch = "hexagon",
+            target_arch = "msp430",
+            target_arch = "powerpc",
+            target_arch = "powerpc64",
+            target_arch = "riscv32",
+            target_arch = "riscv64",
+            target_arch = "s390x",
+            target_arch = "xtensa",
+        )
+    ))] {
+        pub type c_char = u8;
+    } else {
+        // On every other target, c_char is signed.
+        pub type c_char = i8;
+    }
+}
+
+cfg_if! {
+    if #[cfg(any(target_arch = "avr", target_arch = "msp430"))] {
+        pub type c_int = i16;
+        pub type c_uint = u16;
+    } else {
+        pub type c_int = i32;
+        pub type c_uint = u32;
+    }
+}
+
+cfg_if! {
+    if #[cfg(all(target_pointer_width = "64", not(windows)))] {
+        pub type c_long = i64;
+        pub type c_ulong = u64;
+    } else {
+        // The minimal size of `long` in the C standard is 32 bits
+        pub type c_long = i32;
+        pub type c_ulong = u32;
+    }
+}
 
 #[deprecated(since = "0.2.55", note = "Use i8 instead.")]
 pub type int8_t = i8;

src/psp.rs

@@ -6,16 +6,6 @@
 
 use crate::prelude::*;
 
-pub type c_schar = i8;
-pub type c_uchar = u8;
-pub type c_short = i16;
-pub type c_ushort = u16;
-pub type c_int = i32;
-pub type c_uint = u32;
-pub type c_float = f32;
-pub type c_double = f64;
-pub type c_longlong = i64;
-pub type c_ulonglong = u64;
 pub type intmax_t = i64;
 pub type uintmax_t = u64;
 
@@ -25,9 +15,6 @@ pub type intptr_t = isize;
 pub type uintptr_t = usize;
 pub type ssize_t = isize;
 
-pub type c_long = i64;
-pub type c_ulong = u64;
-
 pub type SceKernelVTimerHandler = unsafe extern "C" fn(
     uid: SceUid,
     arg1: *mut SceKernelSysClock,

src/sgx.rs

@@ -1,15 +1,5 @@
 //! SGX C types definition
 
-pub type c_schar = i8;
-pub type c_uchar = u8;
-pub type c_short = i16;
-pub type c_ushort = u16;
-pub type c_int = i32;
-pub type c_uint = u32;
-pub type c_float = f32;
-pub type c_double = f64;
-pub type c_longlong = i64;
-pub type c_ulonglong = u64;
 pub type intmax_t = i64;
 pub type uintmax_t = u64;
 
@@ -19,8 +9,5 @@ pub type intptr_t = isize;
 pub type uintptr_t = usize;
 pub type ssize_t = isize;
 
-pub type c_long = i64;
-pub type c_ulong = u64;
-
 pub const INT_MIN: c_int = -2147483648;
 pub const INT_MAX: c_int = 2147483647;

src/solid/aarch64.rs

@@ -1,3 +1 @@
 pub type wchar_t = u32;
-pub type c_long = i64;
-pub type c_ulong = u64;

src/solid/arm.rs

@@ -1,3 +1 @@
 pub type wchar_t = u32;
-pub type c_long = i32;
-pub type c_ulong = u32;

src/solid/mod.rs

@@ -4,16 +4,6 @@
 
 use crate::prelude::*;
 
-pub type c_schar = i8;
-pub type c_uchar = u8;
-pub type c_short = i16;
-pub type c_ushort = u16;
-pub type c_int = i32;
-pub type c_uint = u32;
-pub type c_float = f32;
-pub type c_double = f64;
-pub type c_longlong = i64;
-pub type c_ulonglong = u64;
 pub type intmax_t = i64;
 pub type uintmax_t = u64;
 

src/switch.rs

@@ -1,15 +1,5 @@
 //! Switch C type definitions
 
-pub type c_schar = i8;
-pub type c_uchar = u8;
-pub type c_short = i16;
-pub type c_ushort = u16;
-pub type c_int = i32;
-pub type c_uint = u32;
-pub type c_float = f32;
-pub type c_double = f64;
-pub type c_longlong = i64;
-pub type c_ulonglong = u64;
 pub type intmax_t = i64;
 pub type uintmax_t = u64;
 
@@ -20,8 +10,6 @@ pub type uintptr_t = usize;
 pub type ssize_t = isize;
 
 pub type off_t = i64;
-pub type c_long = i64;
-pub type c_ulong = u64;
 pub type wchar_t = u32;
 
 pub const INT_MIN: c_int = -2147483648;