Use core::ffi over std::os::raw and libc::c_* (#692)

`core::ffi` is the preferred way to access these type definitions.
Begin removing uses of the versions from `libc`.

`libc::c_void` is not exactly the same as `core::ffi::c_void` but
some code has tried using them interchangeably (like in io-surface).

`libc::size_t` is `usize` on all current platforms.

cocoa-foundation/Cargo.toml

@@ -16,7 +16,6 @@ default-target = "x86_64-apple-darwin"
 [dependencies]
 block = "0.1"
 bitflags = "2"
-libc = "0.2"
 core-foundation = { default-features = false, path = "../core-foundation", version = "0.10" }
 core-graphics-types = { default-features = false, path = "../core-graphics-types", version = "0.2" }
 objc = "0.2.3"

cocoa-foundation/src/foundation.rs

@@ -12,20 +12,19 @@
 use crate::base::{id, nil, BOOL, NO, SEL};
 use bitflags::bitflags;
 use block::Block;
-use libc;
+use core::ffi::{c_char, c_double, c_ulong, c_ulonglong, c_void};
 use objc::{class, msg_send, sel, sel_impl};
-use std::os::raw::c_void;
 use std::ptr;
 
 #[cfg(target_pointer_width = "32")]
-pub type NSInteger = libc::c_int;
+pub type NSInteger = core::ffi::c_int;
 #[cfg(target_pointer_width = "32")]
-pub type NSUInteger = libc::c_uint;
+pub type NSUInteger = core::ffi::c_uint;
 
 #[cfg(target_pointer_width = "64")]
-pub type NSInteger = libc::c_long;
+pub type NSInteger = core::ffi::c_long;
 #[cfg(target_pointer_width = "64")]
-pub type NSUInteger = libc::c_ulong;
+pub type NSUInteger = core::ffi::c_ulong;
 
 pub const NSIntegerMax: NSInteger = NSInteger::max_value();
 pub const NSNotFound: NSInteger = NSIntegerMax;
@@ -245,7 +244,7 @@ impl NSProcessInfo for id {
     }
 }
 
-pub type NSTimeInterval = libc::c_double;
+pub type NSTimeInterval = c_double;
 
 pub trait NSArray: Sized {
     unsafe fn array(_: Self) -> id {
@@ -401,7 +400,7 @@ pub trait NSDictionary: Sized {
     unsafe fn fileOwnerAccountID(self) -> id;
     unsafe fn fileOwnerAccountName(self) -> id;
     unsafe fn filePosixPermissions(self) -> NSUInteger;
-    unsafe fn fileSize(self) -> libc::c_ulonglong;
+    unsafe fn fileSize(self) -> c_ulonglong;
     unsafe fn fileSystemFileNumber(self) -> NSUInteger;
     unsafe fn fileSystemNumber(self) -> NSInteger;
     unsafe fn fileType(self) -> id;
@@ -581,7 +580,7 @@ impl NSDictionary for id {
         msg_send![self, filePosixPermissions]
     }
 
-    unsafe fn fileSize(self) -> libc::c_ulonglong {
+    unsafe fn fileSize(self) -> c_ulonglong {
         msg_send![self, fileSize]
     }
 
@@ -616,7 +615,7 @@ impl NSDictionary for id {
 
 bitflags! {
     #[derive(Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
-    pub struct NSEnumerationOptions: libc::c_ulonglong {
+    pub struct NSEnumerationOptions: c_ulonglong {
         const NSEnumerationConcurrent = 1 << 0;
         const NSEnumerationReverse = 1 << 1;
     }
@@ -639,7 +638,7 @@ pub trait NSString: Sized {
 
     unsafe fn stringByAppendingString_(self, other: id) -> id;
     unsafe fn init_str(self, string: &str) -> Self;
-    unsafe fn UTF8String(self) -> *const libc::c_char;
+    unsafe fn UTF8String(self) -> *const c_char;
     unsafe fn len(self) -> usize;
     unsafe fn isEqualToString(self, string: &str) -> bool;
     unsafe fn substringWithRange(self, range: NSRange) -> id;
@@ -667,7 +666,7 @@ impl NSString for id {
         msg_send![self, lengthOfBytesUsingEncoding: UTF8_ENCODING]
     }
 
-    unsafe fn UTF8String(self) -> *const libc::c_char {
+    unsafe fn UTF8String(self) -> *const c_char {
         msg_send![self, UTF8String]
     }
 
@@ -690,10 +689,10 @@ impl NSDate for id {}
 
 #[repr(C)]
 struct NSFastEnumerationState {
-    pub state: libc::c_ulong,
+    pub state: c_ulong,
     pub items_ptr: *mut id,
-    pub mutations_ptr: *mut libc::c_ulong,
-    pub extra: [libc::c_ulong; 5],
+    pub mutations_ptr: *mut c_ulong,
+    pub extra: [c_ulong; 5],
 }
 
 const NS_FAST_ENUM_BUF_SIZE: usize = 16;
@@ -701,7 +700,7 @@ const NS_FAST_ENUM_BUF_SIZE: usize = 16;
 pub struct NSFastIterator {
     state: NSFastEnumerationState,
     buffer: [id; NS_FAST_ENUM_BUF_SIZE],
-    mut_val: Option<libc::c_ulong>,
+    mut_val: Option<c_ulong>,
     len: usize,
     idx: usize,
     object: id,
@@ -1596,7 +1595,7 @@ impl NSData for id {
 
 bitflags! {
     #[derive(Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
-    pub struct NSDataReadingOptions: libc::c_ulonglong {
+    pub struct NSDataReadingOptions: c_ulonglong {
        const NSDataReadingMappedIfSafe = 1 << 0;
        const NSDataReadingUncached = 1 << 1;
        const NSDataReadingMappedAlways = 1 << 3;
@@ -1605,7 +1604,7 @@ bitflags! {
 
 bitflags! {
     #[derive(Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
-    pub struct NSDataBase64EncodingOptions: libc::c_ulonglong {
+    pub struct NSDataBase64EncodingOptions: c_ulonglong {
         const NSDataBase64Encoding64CharacterLineLength = 1 << 0;
         const NSDataBase64Encoding76CharacterLineLength = 1 << 1;
         const NSDataBase64EncodingEndLineWithCarriageReturn = 1 << 4;
@@ -1615,14 +1614,14 @@ bitflags! {
 
 bitflags! {
     #[derive(Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
-    pub struct NSDataBase64DecodingOptions: libc::c_ulonglong {
+    pub struct NSDataBase64DecodingOptions: c_ulonglong {
        const NSDataBase64DecodingIgnoreUnknownCharacters = 1 << 0;
     }
 }
 
 bitflags! {
     #[derive(Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
-    pub struct NSDataWritingOptions: libc::c_ulonglong {
+    pub struct NSDataWritingOptions: c_ulonglong {
         const NSDataWritingAtomic = 1 << 0;
         const NSDataWritingWithoutOverwriting = 1 << 1;
     }
@@ -1630,7 +1629,7 @@ bitflags! {
 
 bitflags! {
     #[derive(Clone, Copy, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
-    pub struct NSDataSearchOptions: libc::c_ulonglong {
+    pub struct NSDataSearchOptions: c_ulonglong {
         const NSDataSearchBackwards = 1 << 0;
         const NSDataSearchAnchored = 1 << 1;
     }