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.

core-foundation-sys/src/array.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{Boolean, CFAllocatorRef, CFComparatorFunction, CFIndex, CFRange, CFTypeID};
 use crate::string::CFStringRef;

core-foundation-sys/src/attributed_string.rs

@@ -11,7 +11,7 @@ use crate::base::{Boolean, CFAllocatorRef, CFIndex, CFRange, CFTypeID, CFTypeRef
 use crate::dictionary::CFDictionaryRef;
 use crate::string::CFMutableStringRef;
 use crate::string::CFStringRef;
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 #[repr(C)]
 pub struct __CFAttributedString(c_void);

core-foundation-sys/src/bag.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{Boolean, CFAllocatorRef, CFHashCode, CFIndex, CFTypeID};
 use crate::string::CFStringRef;

core-foundation-sys/src/base.rs

@@ -8,8 +8,8 @@
 // except according to those terms.
 
 use crate::string::CFStringRef;
+use core::ffi::{c_int, c_short, c_uchar, c_uint, c_ushort, c_void};
 use std::cmp::Ordering;
-use std::os::raw::{c_int, c_short, c_uchar, c_uint, c_ushort, c_void};
 
 pub type Boolean = u8;
 pub type mach_port_t = c_uint;

core-foundation-sys/src/binary_heap.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{Boolean, CFAllocatorRef, CFComparisonResult, CFIndex, CFTypeID};
 use crate::string::CFStringRef;

core-foundation-sys/src/bit_vector.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{Boolean, CFAllocatorRef, CFIndex, CFRange, CFTypeID, UInt32, UInt8};
 

core-foundation-sys/src/bundle.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::array::CFArrayRef;
 #[cfg(target_os = "macos")]
@@ -17,7 +17,7 @@ use crate::dictionary::CFDictionaryRef;
 use crate::error::CFErrorRef;
 use crate::string::CFStringRef;
 use crate::url::CFURLRef;
-use std::os::raw::{c_int, c_uint};
+use core::ffi::{c_int, c_uint};
 
 #[repr(C)]
 pub struct __CFBundle(c_void);

core-foundation-sys/src/calendar.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::{c_char, c_void};
+use core::ffi::{c_char, c_void};
 
 use crate::base::{Boolean, CFAllocatorRef, CFIndex, CFOptionFlags, CFRange, CFTypeID};
 use crate::date::{CFAbsoluteTime, CFTimeInterval};

core-foundation-sys/src/characterset.rs

@@ -10,7 +10,7 @@
 use crate::base::{Boolean, CFAllocatorRef, CFIndex, CFRange, CFTypeID, UTF32Char};
 use crate::data::CFDataRef;
 use crate::string::{CFStringRef, UniChar};
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 pub type CFCharacterSetPredefinedSet = CFIndex;
 

core-foundation-sys/src/data.rs

@@ -8,7 +8,7 @@
 // except according to those terms.
 
 use crate::base::{CFAllocatorRef, CFIndex, CFOptionFlags, CFRange, CFTypeID};
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 #[repr(C)]
 pub struct __CFData(c_void);

core-foundation-sys/src/date.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{CFAllocatorRef, CFComparisonResult, CFTypeID};
 

core-foundation-sys/src/date_formatter.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{Boolean, CFAllocatorRef, CFIndex, CFOptionFlags, CFRange, CFTypeID, CFTypeRef};
 use crate::date::{CFAbsoluteTime, CFDateRef};

core-foundation-sys/src/dictionary.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{Boolean, CFAllocatorRef, CFHashCode, CFIndex, CFTypeID};
 use crate::string::CFStringRef;

core-foundation-sys/src/error.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{CFAllocatorRef, CFIndex, CFTypeID};
 use crate::dictionary::CFDictionaryRef;

core-foundation-sys/src/file_security.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 #[cfg(feature = "mac_os_10_8_features")]
 use crate::base::CFOptionFlags;

core-foundation-sys/src/filedescriptor.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::{c_int, c_void};
+use core::ffi::{c_int, c_void};
 
 use crate::base::{Boolean, CFAllocatorRef, CFIndex, CFOptionFlags, CFTypeID};
 use crate::runloop::CFRunLoopSourceRef;

core-foundation-sys/src/locale.rs

@@ -12,7 +12,7 @@ use crate::base::{CFAllocatorRef, CFIndex, CFTypeID, CFTypeRef, LangCode, Region
 use crate::dictionary::CFDictionaryRef;
 use crate::notification_center::CFNotificationName;
 use crate::string::CFStringRef;
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 #[repr(C)]
 pub struct __CFLocale(c_void);

core-foundation-sys/src/mach_port.rs

@@ -11,7 +11,7 @@ use crate::base::{mach_port_t, Boolean};
 pub use crate::base::{CFAllocatorRef, CFIndex, CFTypeID};
 use crate::runloop::CFRunLoopSourceRef;
 use crate::string::CFStringRef;
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 #[repr(C)]
 pub struct __CFMachPort(c_void);

core-foundation-sys/src/messageport.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{Boolean, CFAllocatorRef, CFIndex, CFTypeID, SInt32};
 use crate::data::CFDataRef;

core-foundation-sys/src/notification_center.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{Boolean, CFIndex, CFOptionFlags, CFTypeID};
 use crate::dictionary::CFDictionaryRef;

core-foundation-sys/src/number.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{Boolean, CFAllocatorRef, CFComparisonResult, CFIndex, CFTypeID};
 

core-foundation-sys/src/number_formatter.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::{c_double, c_void};
+use core::ffi::{c_double, c_void};
 
 use crate::base::{Boolean, CFAllocatorRef, CFIndex, CFOptionFlags, CFRange, CFTypeID, CFTypeRef};
 use crate::locale::CFLocaleRef;

core-foundation-sys/src/plugin.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::array::CFArrayRef;
 use crate::base::{Boolean, CFAllocatorRef, CFIndex, CFTypeID};

core-foundation-sys/src/runloop.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::array::CFArrayRef;
 use crate::base::{

core-foundation-sys/src/set.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{Boolean, CFAllocatorRef, CFHashCode, CFIndex, CFTypeID};
 use crate::string::CFStringRef;

core-foundation-sys/src/socket.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{Boolean, CFAllocatorRef, CFIndex, CFOptionFlags, CFTypeID, SInt32, UInt16};
 use crate::data::CFDataRef;
@@ -31,9 +31,9 @@ pub type CFSocketCallBack = extern "C" fn(
     info: *mut c_void,
 );
 #[cfg(not(target_os = "windows"))]
-pub type CFSocketNativeHandle = std::os::raw::c_int;
+pub type CFSocketNativeHandle = core::ffi::c_int;
 #[cfg(target_os = "windows")]
-pub type CFSocketNativeHandle = std::os::raw::c_ulong;
+pub type CFSocketNativeHandle = core::ffi::c_ulong;
 
 pub const kCFSocketSuccess: CFSocketError = 0;
 pub const kCFSocketError: CFSocketError = -1;

core-foundation-sys/src/stream.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::{c_int, c_void};
+use core::ffi::{c_int, c_void};
 
 use crate::base::{
     Boolean, CFAllocatorRef, CFIndex, CFOptionFlags, CFTypeID, CFTypeRef, SInt32, UInt32, UInt8,

core-foundation-sys/src/string.rs

@@ -16,7 +16,7 @@ use crate::characterset::CFCharacterSetRef;
 use crate::data::CFDataRef;
 use crate::dictionary::CFDictionaryRef;
 use crate::locale::CFLocaleRef;
-use std::os::raw::{c_char, c_double, c_ulong, c_ushort, c_void};
+use core::ffi::{c_char, c_double, c_ulong, c_ushort, c_void};
 
 pub type CFStringCompareFlags = CFOptionFlags;
 pub const kCFCompareCaseInsensitive: CFStringCompareFlags = 1;

core-foundation-sys/src/string_tokenizer.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::array::CFMutableArrayRef;
 use crate::base::{CFAllocatorRef, CFIndex, CFOptionFlags, CFRange, CFTypeID, CFTypeRef};

core-foundation-sys/src/timezone.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::array::CFArrayRef;
 use crate::base::{Boolean, CFAllocatorRef, CFIndex, CFTypeID};

core-foundation-sys/src/tree.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{CFAllocatorRef, CFComparatorFunction, CFIndex, CFTypeID};
 use crate::string::CFStringRef;

core-foundation-sys/src/url.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::array::CFArrayRef;
 use crate::base::{

core-foundation-sys/src/url_enumerator.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::array::CFArrayRef;
 use crate::base::{Boolean, CFAllocatorRef, CFIndex, CFOptionFlags, CFTypeID};

core-foundation-sys/src/user_notification.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{CFAllocatorRef, CFIndex, CFOptionFlags, CFTypeID, SInt32};
 use crate::date::CFTimeInterval;

core-foundation-sys/src/uuid.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{CFAllocatorRef, CFTypeID};
 use crate::string::CFStringRef;

core-foundation-sys/src/xml_node.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::{c_char, c_void};
+use core::ffi::{c_char, c_void};
 
 use crate::array::CFArrayRef;
 use crate::base::{Boolean, CFAllocatorRef, CFIndex, CFTypeID};

core-foundation-sys/src/xml_parser.rs

@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use crate::base::{Boolean, CFAllocatorRef, CFIndex, CFOptionFlags, CFTypeID};
 use crate::data::CFDataRef;