Consolidate wctomb/mbtowc calls for POSIX-1.2008

- Remove charset parameter from low level __foo_wctomb/__foo_mbtowc calls.
- Instead, create array of function for ISO and Windows codepages to point
  to function which does not require to evaluate the charset string on
  each call.  Create matching helper functions.  I.e., __iso_wctomb,
  __iso_mbtowc, __cp_wctomb and __cp_mbtowc are functions returning the
  right function pointer now.
- Create __WCTOMB/__MBTOWC macros utilizing per-reent locale and replace
  calls to __wctomb/__mbtowc with calls to __WCTOMB/__MBTOWC.
- Drop global __wctomb/__mbtowc vars.
- Utilize aforementioned changes in Cygwin to get rid of charset in other,
  calling functions and simplify the code.
- In Cygwin restrict global cygheap locale info to the job performed
  by internal_setlocale.  Use UTF-8 instead of ASCII on the fly in
  internal conversion functions.
- In Cygwin dll_entry, make sure to initialize a TLS area with a NULL
  _REENT->_locale pointer.  Add comment to explain why.

Signed-off by: Corinna Vinschen <corinna@vinschen.de>

2 files changed, 2 insertions, 3 deletions

diff --git a/newlib/libc/ctype/isprint.c b/newlib/libc/ctype/isprint.c
index 87254f4bc..172a2333b 100644
--- a/newlib/libc/ctype/isprint.c
+++ b/newlib/libc/ctype/isprint.c
@@ -56,6 +56,6 @@ _DEFUN(isgraph,(c),int c)
 int
 _DEFUN(isprint,(c),int c)
 {
-	return(__ctype_ptr__[c+1] & (_P|_U|_L|_N|_B));
+	return(__CTYPE_PTR[c+1] & (_P|_U|_L|_N|_B));
 }
 
diff --git a/newlib/libc/ctype/local.h b/newlib/libc/ctype/local.h
index 1a16520a7..b3788e218 100644
--- a/newlib/libc/ctype/local.h
+++ b/newlib/libc/ctype/local.h
@@ -1,6 +1,7 @@
 /* wctrans constants */
 
 #include <_ansi.h>
+#include "../locale/setlocale.h"
 
 /* valid values for wctrans_t */
 #define WCT_TOLOWER 1
@@ -20,8 +21,6 @@
 #define WC_UPPER	11
 #define WC_XDIGIT	12
 
-extern char *__locale_charset(_NOARGS);
-
 /* internal function to translate JP to Unicode */
 #ifdef __CYGWIN__
 /* Under Cygwin, the incoming wide character is already given in UTF due