Move towlower and towupper to wctype.h and Implement it

This patch creates wctype.h and impelementat two functions
that belong to that header file towupper and towlower. These
functions are building blocks for wcscasecmp and wcsncasecmp
which are utilized by binutils.

The implementation for towlower and towupper seams to be complex
so this implementation is mimicking that of musl libc

src/header/mod.rs

@@ -59,3 +59,4 @@ pub mod time;
 pub mod unistd;
 pub mod utime;
 pub mod wchar;
+pub mod wctype;

src/header/wchar/mod.rs

@@ -3,14 +3,13 @@
 use core::{char, ffi::VaList as va_list, mem, ptr, slice, usize};
 
 use crate::{
-    header::{ctype::isspace, errno::ERANGE, stdio::*, stdlib::MB_CUR_MAX, string, time::*},
+    header::{
+        ctype::isspace, errno::ERANGE, stdio::*, stdlib::MB_CUR_MAX, string, time::*, wctype::*,
+    },
     platform::{self, types::*},
 };
 
 mod utf8;
-
-const WEOF: wint_t = 0xFFFF_FFFFu32;
-
 #[repr(C)]
 #[derive(Clone, Copy)]
 pub struct mbstate_t;
@@ -27,7 +26,7 @@ pub unsafe extern "C" fn btowc(c: c_int) -> wint_t {
     let mut ps: mbstate_t = mbstate_t;
     let mut wc: wchar_t = 0;
     let saved_errno = platform::errno;
-    let status = mbrtowc(&mut wc, &c as (*const c_char), 1, &mut ps);
+    let status = mbrtowc(&mut wc, &c as *const c_char, 1, &mut ps);
     if status == usize::max_value() || status == usize::max_value() - 1 {
         platform::errno = saved_errno;
         return WEOF;
@@ -238,16 +237,6 @@ pub extern "C" fn swscanf(s: *const wchar_t, format: *const wchar_t, ap: va_list
     unimplemented!();
 }
 
-// #[no_mangle]
-pub extern "C" fn towlower(wc: wint_t) -> wint_t {
-    unimplemented!();
-}
-
-// #[no_mangle]
-pub extern "C" fn towupper(wc: wint_t) -> wint_t {
-    unimplemented!();
-}
-
 // #[no_mangle]
 pub extern "C" fn ungetwc(wc: wint_t, stream: *mut FILE) -> wint_t {
     unimplemented!();

src/header/wctype/casecmp.rs

@@ -0,0 +1,406 @@
+use crate::platform::types::*;
+const tab: [c_uchar; 2666] = [
+    7, 8, 9, 10, 11, 12, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 13, 6, 6, 14, 6, 6, 6, 6, 6, 6, 6, 6, 15,
+    16, 17, 18, 6, 19, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 20, 21, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 22, 23, 6, 6, 6, 24, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 25, 6, 6, 6, 6, 26, 6, 6, 6, 6, 6, 6, 6, 27, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    28, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 29, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 30, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 36, 43, 43, 43,
+    43, 43, 43, 43, 43, 1, 0, 84, 86, 86, 86, 86, 86, 86, 86, 86, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 24, 0, 0, 0, 43, 43, 43, 43, 43, 43, 43, 7, 43, 43, 91, 86, 86, 86, 86,
+    86, 86, 86, 74, 86, 86, 5, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 36,
+    80, 121, 49, 80, 49, 80, 49, 56, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80,
+    78, 49, 2, 78, 13, 13, 78, 3, 78, 0, 36, 110, 0, 78, 49, 38, 110, 81, 78, 36, 80, 78, 57, 20,
+    129, 27, 29, 29, 83, 49, 80, 49, 80, 13, 49, 80, 49, 80, 49, 80, 27, 83, 36, 80, 49, 2, 92,
+    123, 92, 123, 92, 123, 92, 123, 92, 123, 20, 121, 92, 123, 92, 123, 92, 45, 43, 73, 3, 72, 3,
+    120, 92, 123, 20, 0, 150, 10, 1, 43, 40, 6, 6, 0, 42, 6, 42, 42, 43, 7, 187, 181, 43, 30, 0,
+    43, 7, 43, 43, 43, 1, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43,
+    43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 1, 43, 43, 43, 43, 43, 43, 43, 43, 43,
+    43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 42, 43, 43, 43, 43, 43, 43, 43, 43, 43,
+    43, 43, 43, 43, 205, 70, 205, 43, 0, 37, 43, 7, 1, 6, 1, 85, 86, 86, 86, 86, 86, 85, 86, 86, 2,
+    36, 129, 129, 129, 129, 129, 21, 129, 129, 129, 0, 0, 43, 0, 178, 209, 178, 209, 178, 209, 178,
+    209, 0, 0, 205, 204, 1, 0, 215, 215, 215, 215, 215, 131, 129, 129, 129, 129, 129, 129, 129,
+    129, 129, 129, 172, 172, 172, 172, 172, 172, 172, 172, 172, 172, 28, 0, 0, 0, 0, 0, 49, 80, 49,
+    80, 49, 80, 49, 80, 49, 80, 49, 2, 0, 0, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49,
+    80, 49, 80, 49, 80, 78, 49, 80, 49, 80, 78, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49,
+    80, 49, 2, 135, 166, 135, 166, 135, 166, 135, 166, 135, 166, 135, 166, 135, 166, 135, 166, 42,
+    43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 0, 0, 0, 84, 86, 86, 86, 86, 86, 86, 86, 86,
+    86, 86, 86, 86, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 84, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86, 12, 0, 12, 42, 43, 43, 43, 43,
+    43, 43, 43, 43, 43, 43, 43, 43, 43, 7, 42, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 42, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43,
+    43, 43, 43, 43, 43, 43, 43, 86, 86, 108, 129, 21, 0, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43,
+    43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43,
+    43, 43, 43, 43, 43, 43, 43, 43, 7, 108, 3, 65, 43, 43, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86,
+    86, 86, 86, 86, 44, 86, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43,
+    43, 43, 43, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 108, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 37, 6,
+    37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37,
+    6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 86, 122, 158, 38, 6, 37,
+    6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6, 37, 6,
+    37, 6, 1, 43, 43, 79, 86, 86, 44, 43, 127, 86, 86, 57, 43, 43, 85, 86, 86, 43, 43, 79, 86, 86,
+    44, 43, 127, 86, 86, 129, 55, 117, 91, 123, 92, 43, 43, 79, 86, 86, 2, 172, 4, 0, 0, 57, 43,
+    43, 85, 86, 86, 43, 43, 79, 86, 86, 44, 43, 43, 86, 86, 50, 19, 129, 87, 0, 111, 129, 126, 201,
+    215, 126, 45, 129, 129, 14, 126, 57, 127, 111, 87, 0, 129, 129, 126, 21, 0, 126, 3, 43, 43, 43,
+    43, 43, 43, 43, 43, 43, 43, 43, 43, 7, 43, 36, 43, 151, 43, 43, 43, 43, 43, 43, 43, 43, 43, 42,
+    43, 43, 43, 43, 43, 86, 86, 86, 86, 86, 128, 129, 129, 129, 129, 57, 187, 42, 43, 43, 43, 43,
+    43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43,
+    43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 1, 129, 129, 129, 129, 129, 129, 129, 129, 129,
+    129, 129, 129, 129, 129, 129, 201, 172, 172, 172, 172, 172, 172, 172, 172, 172, 172, 172, 172,
+    172, 172, 172, 208, 13, 0, 78, 49, 2, 180, 193, 193, 215, 215, 36, 80, 49, 80, 49, 80, 49, 80,
+    49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80,
+    49, 80, 215, 215, 83, 193, 71, 212, 215, 215, 215, 5, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43,
+    43, 43, 7, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 78, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 49, 80, 13, 0, 0, 0, 0, 0, 36, 80,
+    49, 80, 49, 80, 49, 80, 49, 80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 121, 92,
+    123, 92, 123, 79, 123, 92, 123, 92, 123, 92, 123, 92, 123, 92, 123, 92, 123, 92, 123, 92, 123,
+    92, 123, 92, 45, 43, 43, 121, 20, 92, 123, 92, 45, 121, 42, 92, 39, 92, 123, 92, 123, 92, 123,
+    164, 0, 10, 180, 92, 123, 92, 123, 79, 3, 42, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43,
+    43, 43, 43, 43, 43, 43, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 72, 0, 0, 0, 0, 0, 0, 0, 0, 0, 42, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43,
+    43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 43, 43, 43, 43, 43, 43, 43, 43, 7,
+    0, 72, 86, 86, 86, 86, 86, 86, 86, 86, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 85, 86, 86, 86, 86, 86, 86,
+    86, 86, 86, 86, 86, 86, 14, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 36, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 7, 0, 86, 86, 86,
+    86, 86, 86, 86, 86, 86, 86, 86, 86, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 36, 43, 43, 43, 43, 43,
+    43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 7, 0, 0, 0, 0, 86, 86, 86, 86, 86, 86, 86, 86, 86,
+    86, 86, 86, 86, 86, 86, 86, 86, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 42, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 86, 86, 86, 86, 86, 86, 86, 86, 86,
+    86, 14, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 42, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 86, 86, 86, 86, 86, 86, 86, 86, 86, 86,
+    14, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 85, 86, 86,
+    86, 86, 86, 86, 86, 86, 86, 86, 14, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+];
+const rules: [c_int; 240] = [
+    0x0, 0x2001, -0x2000, 0x1dbf00, 0x2e700, 0x7900, 0x2402, 0x101, -0x100, 0x0, 0x201, -0x200,
+    -0xc6ff, -0xe800, -0x78ff, -0x12c00, 0xc300, 0xd201, 0xce01, 0xcd01, 0x4f01, 0xca01, 0xcb01,
+    0xcf01, 0x6100, 0xd301, 0xd101, 0xa300, 0xd501, 0x8200, 0xd601, 0xda01, 0xd901, 0xdb01, 0x3800,
+    0x3, -0x4f00, -0x60ff, -0x37ff, 0x242802, 0x0, 0x101, -0x100, -0xcd00, -0xda00, -0x81ff,
+    0x2a2b01, -0xa2ff, 0x2a2801, 0x2a3f00, -0xc2ff, 0x4501, 0x4701, 0x2a1f00, 0x2a1c00, 0x2a1e00,
+    -0xd200, -0xce00, -0xca00, -0xcb00, 0xa54f00, 0xa54b00, -0xcf00, 0xa52800, 0xa54400, -0xd100,
+    -0xd300, 0x29f700, 0xa54100, 0x29fd00, -0xd500, -0xd600, 0x29e700, 0xa54300, 0xa52a00, -0x4500,
+    -0xd900, -0x4700, -0xdb00, 0xa51500, 0xa51200, 0x4c2402, 0x0, 0x2001, -0x2000, 0x101, -0x100,
+    0x5400, 0x7401, 0x2601, 0x2501, 0x4001, 0x3f01, -0x2600, -0x2500, -0x1f00, -0x4000, -0x3f00,
+    0x801, -0x3e00, -0x3900, -0x2f00, -0x3600, -0x800, -0x5600, -0x5000, 0x700, -0x7400, -0x3bff,
+    -0x6000, -0x6ff, 0x701a02, 0x101, -0x100, 0x2001, -0x2000, 0x5001, 0xf01, -0xf00, 0x0, 0x3001,
+    -0x3000, 0x101, -0x100, 0x0, 0xbc000, 0x1c6001, 0x0, 0x97d001, 0x801, -0x800, 0x8a0502, 0x0,
+    -0xbbfff, -0x186200, 0x89c200, -0x182500, -0x186e00, -0x186d00, -0x186400, -0x186300,
+    -0x185c00, 0x0, 0x8a3800, 0x8a0400, 0xee600, 0x101, -0x100, 0x0, -0x3b00, -0x1dbeff, 0x8f1d02,
+    0x800, -0x7ff, 0x0, 0x5600, -0x55ff, 0x4a00, 0x6400, 0x8000, 0x7000, 0x7e00, 0x900, -0x49ff,
+    -0x8ff, -0x1c2500, -0x63ff, -0x6fff, -0x7fff, -0x7dff, 0xac0502, 0x0, 0x1001, -0x1000, 0x1c01,
+    0x101, -0x1d5cff, -0x20beff, -0x2045ff, -0x1c00, 0xb10b02, 0x101, -0x100, 0x3001, -0x3000, 0x0,
+    -0x29f6ff, -0xee5ff, -0x29e6ff, -0x2a2b00, -0x2a2800, -0x2a1bff, -0x29fcff, -0x2a1eff,
+    -0x2a1dff, -0x2a3eff, 0x0, -0x1c6000, 0x0, 0x101, -0x100, 0xbc0c02, 0x0, 0x101, -0x100,
+    -0xa543ff, 0x3a001, -0x8a03ff, -0xa527ff, 0x3000, -0xa54eff, -0xa54aff, -0xa540ff, -0xa511ff,
+    -0xa529ff, -0xa514ff, -0x2fff, -0xa542ff, -0x8a37ff, 0x0, -0x97d000, -0x3a000, 0x0, 0x2001,
+    -0x2000, 0x0, 0x2801, -0x2800, 0x0, 0x4001, -0x4000, 0x0, 0x2001, -0x2000, 0x0, 0x2001,
+    -0x2000, 0x0, 0x2201, -0x2200,
+];
+const rulebases: [c_uchar; 512] = [
+    0, 6, 39, 81, 111, 119, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 124, 0, 0, 127, 0, 0, 0, 0, 0, 0, 0, 0,
+    131, 142, 146, 151, 0, 170, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 180, 196, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 198, 201, 0, 0, 0, 219, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 222, 0, 0, 0, 0, 225, 0, 0, 0, 0, 0, 0, 0, 228, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 231, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 234, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 237, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+];
+const exceptions: [[c_uchar; 2]; 200] = [
+    [48, 12],
+    [49, 13],
+    [120, 14],
+    [127, 15],
+    [128, 16],
+    [129, 17],
+    [134, 18],
+    [137, 19],
+    [138, 19],
+    [142, 20],
+    [143, 21],
+    [144, 22],
+    [147, 19],
+    [148, 23],
+    [149, 24],
+    [150, 25],
+    [151, 26],
+    [154, 27],
+    [156, 25],
+    [157, 28],
+    [158, 29],
+    [159, 30],
+    [166, 31],
+    [169, 31],
+    [174, 31],
+    [177, 32],
+    [178, 32],
+    [183, 33],
+    [191, 34],
+    [197, 35],
+    [200, 35],
+    [203, 35],
+    [221, 36],
+    [242, 35],
+    [246, 37],
+    [247, 38],
+    [32, 45],
+    [58, 46],
+    [61, 47],
+    [62, 48],
+    [63, 49],
+    [64, 49],
+    [67, 50],
+    [68, 51],
+    [69, 52],
+    [80, 53],
+    [81, 54],
+    [82, 55],
+    [83, 56],
+    [84, 57],
+    [89, 58],
+    [91, 59],
+    [92, 60],
+    [97, 61],
+    [99, 62],
+    [101, 63],
+    [102, 64],
+    [104, 65],
+    [105, 66],
+    [106, 64],
+    [107, 67],
+    [108, 68],
+    [111, 66],
+    [113, 69],
+    [114, 70],
+    [117, 71],
+    [125, 72],
+    [130, 73],
+    [135, 74],
+    [137, 75],
+    [138, 76],
+    [139, 76],
+    [140, 77],
+    [146, 78],
+    [157, 79],
+    [158, 80],
+    [69, 87],
+    [123, 29],
+    [124, 29],
+    [125, 29],
+    [127, 88],
+    [134, 89],
+    [136, 90],
+    [137, 90],
+    [138, 90],
+    [140, 91],
+    [142, 92],
+    [143, 92],
+    [172, 93],
+    [173, 94],
+    [174, 94],
+    [175, 94],
+    [194, 95],
+    [204, 96],
+    [205, 97],
+    [206, 97],
+    [207, 98],
+    [208, 99],
+    [209, 100],
+    [213, 101],
+    [214, 102],
+    [215, 103],
+    [240, 104],
+    [241, 105],
+    [242, 106],
+    [243, 107],
+    [244, 108],
+    [245, 109],
+    [249, 110],
+    [253, 45],
+    [254, 45],
+    [255, 45],
+    [80, 105],
+    [81, 105],
+    [82, 105],
+    [83, 105],
+    [84, 105],
+    [85, 105],
+    [86, 105],
+    [87, 105],
+    [88, 105],
+    [89, 105],
+    [90, 105],
+    [91, 105],
+    [92, 105],
+    [93, 105],
+    [94, 105],
+    [95, 105],
+    [130, 0],
+    [131, 0],
+    [132, 0],
+    [133, 0],
+    [134, 0],
+    [135, 0],
+    [136, 0],
+    [137, 0],
+    [192, 117],
+    [207, 118],
+    [128, 137],
+    [129, 138],
+    [130, 139],
+    [133, 140],
+    [134, 141],
+    [112, 157],
+    [113, 157],
+    [118, 158],
+    [119, 158],
+    [120, 159],
+    [121, 159],
+    [122, 160],
+    [123, 160],
+    [124, 161],
+    [125, 161],
+    [179, 162],
+    [186, 163],
+    [187, 163],
+    [188, 164],
+    [190, 165],
+    [195, 162],
+    [204, 164],
+    [218, 166],
+    [219, 166],
+    [229, 106],
+    [234, 167],
+    [235, 167],
+    [236, 110],
+    [243, 162],
+    [248, 168],
+    [249, 168],
+    [250, 169],
+    [251, 169],
+    [252, 164],
+    [38, 176],
+    [42, 177],
+    [43, 178],
+    [78, 179],
+    [132, 8],
+    [98, 186],
+    [99, 187],
+    [100, 188],
+    [101, 189],
+    [102, 190],
+    [109, 191],
+    [110, 192],
+    [111, 193],
+    [112, 194],
+    [126, 195],
+    [127, 195],
+    [125, 207],
+    [141, 208],
+    [148, 209],
+    [171, 210],
+    [172, 211],
+    [173, 212],
+    [176, 213],
+    [177, 214],
+    [178, 215],
+    [196, 216],
+    [197, 217],
+    [198, 218],
+];
+
+pub fn casemap(mut c: u32, dir: i32) -> wint_t {
+    if c >= 0x20000 {
+        return c;
+    }
+    let c0 = c;
+    let b = c >> 8;
+    c &= 255;
+    let x = c / 3;
+    let y = c % 3;
+    /* lookup entry in two-level base-6 table */
+    let mut v: c_uint = tab[(tab[b as usize] as u32 * 86 + x) as usize] as c_uint;
+    let mt: [c_uint; 3] = [2048, 342, 57];
+    v = (v * mt[y as usize] >> 11) % 6;
+
+    /* use the bit vector out of the tables as an index into
+     * a block-specific set of rules and decode the rule into
+     * a type and a case-mapping delta. */
+    let mut r: c_int = rules[(rulebases[b as usize] as c_uint + v) as usize];
+    let mut rt: c_uint = (r & 255) as c_uint;
+    let mut rd: c_int = r >> 8;
+
+    /* rules 0/1 are simple lower/upper case with a delta.
+     * apply according to desired mapping direction. */
+    if rt < 2 {
+        let tmp = -((rt ^ dir as c_uint) as c_int) as c_uint;
+        return c0.wrapping_add(rd as c_uint & tmp);
+    }
+
+    /* binary search. endpoints of the binary search for
+     * this block are stored in the rule delta field. */
+    let mut xn: c_uint = (rd & 0xff) as c_uint;
+    let mut xb: c_uint = rd as c_uint >> 8;
+    while xn != 0 {
+        let attempt: c_uint = exceptions[(xb + xn / 2) as usize][0] as c_uint;
+        if attempt == c {
+            r = rules[exceptions[(xb + xn / 2) as usize][1] as usize];
+            rt = r as c_uint & 255;
+            rd = r >> 8;
+            if rt < 2 {
+                let tmp = -((rt ^ dir as c_uint) as c_int) as c_uint;
+                return c0.wrapping_add(rd as c_uint & tmp);
+            }
+            /* Hard-coded for the four exceptional titlecase */
+            if dir == 0 {
+                return c0 + 1;
+            } else {
+                return c0 - 1;
+            }
+        } else if attempt > c {
+            xn /= 2;
+        } else {
+            xb += xn / 2;
+            xn -= xn / 2;
+        }
+    }
+    return c0;
+}

src/header/wctype/cbindgen.toml

@@ -0,0 +1,10 @@
+sys_includes = ["stddef.h", "stdint.h", "time.h", "stdio.h" ]
+include_guard = "_WCTYPE_H"
+header = ""
+language = "C"
+style = "Type"
+no_includes = true
+cpp_compat = true
+
+[enum]
+prefix_with_name = true

src/header/wctype/mod.rs

@@ -0,0 +1,17 @@
+//! wchar implementation for Redox, following http://pubs.opengroup.org/onlinepubs/7908799/xsh/wchar.h.html
+
+use crate::platform::types::*;
+
+mod casecmp;
+use casecmp::casemap;
+pub const WEOF: wint_t = 0xFFFF_FFFFu32;
+
+#[no_mangle]
+pub extern "C" fn towlower(wc: wint_t) -> wint_t {
+    casemap(wc, 0)
+}
+
+#[no_mangle]
+pub extern "C" fn towupper(wc: wint_t) -> wint_t {
+    casemap(wc, 1)
+}