[newlib-cygwin] Drop global __ctype_ptr__ entirely in favor of using locale_t::ctype_ptr

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=e97109184ab0a2de680a90a432d94f86e5be7b0f

commit e97109184ab0a2de680a90a432d94f86e5be7b0f
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Thu Aug 25 14:18:31 2016 +0200

    Drop global __ctype_ptr__ entirely in favor of using locale_t::ctype_ptr
    
    Keep __ctype_ptr__ available on Cygwin only, for backward compatibility
    with existing apps referencing it via the ctype macros.
    
    Otherwise initialize __global_locale.ctype_ptr and __C_locale.ctype_ptr
    and use them throughout.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 newlib/libc/ctype/ctype_.c  | 31 +++++++------------------------
 newlib/libc/ctype/ctype_.h  | 18 ++++++++++++++++++
 newlib/libc/locale/locale.c | 21 ++++++++-------------
 winsup/cygwin/ctype.cc      |  8 ++++----
 4 files changed, 37 insertions(+), 41 deletions(-)

diff --git a/newlib/libc/ctype/ctype_.c b/newlib/libc/ctype/ctype_.c
index 8945c56..9e3cdcf 100644
--- a/newlib/libc/ctype/ctype_.c
+++ b/newlib/libc/ctype/ctype_.c
@@ -35,7 +35,7 @@
 static char sccsid[] = "@(#)ctype_.c	5.6 (Berkeley) 6/1/90";
 #endif /* LIBC_SCCS and not lint */
 
-#include <ctype.h>
+#include "ctype_.h"
 #include "../locale/setlocale.h"
 
 #define _CTYPE_DATA_0_127 \
@@ -74,10 +74,6 @@ static char sccsid[] = "@(#)ctype_.c	5.6 (Berkeley) 6/1/90";
 	0,	0,	0,	0,	0,	0,	0,	0, \
 	0,	0,	0,	0,	0,	0,	0,	0
 
-#if (defined(__GNUC__) && !defined(__CHAR_UNSIGNED__) && !defined(COMPACT_CTYPE)) || defined (__CYGWIN__)
-#define ALLOW_NEGATIVE_CTYPE_INDEX
-#endif
-
 #if defined(_MB_CAPABLE)
 #if defined(_MB_EXTENDED_CHARSETS_ISO)
 #include "ctype_iso.h"
@@ -91,7 +87,7 @@ static char sccsid[] = "@(#)ctype_.c	5.6 (Berkeley) 6/1/90";
 /* No static const on Cygwin since it's referenced and potentially overwritten
    for compatibility with older applications. */
 #ifndef __CYGWIN__
-static _CONST
+_CONST
 #endif
 char _ctype_b[128 + 256] = {
 	_CTYPE_DATA_128_255,
@@ -99,12 +95,10 @@ char _ctype_b[128 + 256] = {
 	_CTYPE_DATA_128_255
 };
 
-#ifndef _MB_CAPABLE
-_CONST
-#endif
-char __EXPORT *__ctype_ptr__ = (char *) _ctype_b + 127;
-
 #  ifdef __CYGWIN__
+/* For backward compatibility */
+char __EXPORT *__ctype_ptr__ = DEFAULT_CTYPE_PTR;
+
 #    ifdef __x86_64__
 __asm__ ("					\n\
         .data					\n\
@@ -137,11 +131,6 @@ _CONST char _ctype_[1 + 256] = {
 	_CTYPE_DATA_128_255
 };
 
-#ifndef _MB_CAPABLE
-_CONST
-#endif
-char *__ctype_ptr__ = (char *) _ctype_;
-
 #endif	/* !ALLOW_NEGATIVE_CTYPE_INDEX */
 
 #if defined(_MB_CAPABLE)
@@ -191,15 +180,9 @@ __set_ctype (struct __locale_t *loc, const char *charset)
 #  endif
     }
 #  if defined(ALLOW_NEGATIVE_CTYPE_INDEX)
-  if (loc)
-    loc->ctype_ptr = ctype_ptr + 127;
-  else
-    __ctype_ptr__ = ctype_ptr + 127;
+  loc->ctype_ptr = ctype_ptr + 127;
 #  else
-  if (loc)
-    loc->ctype_ptr = ctype_ptr;
-  else
-    __ctype_ptr__ = ctype_ptr;
+  loc->ctype_ptr = ctype_ptr;
 #  endif
 }
 #endif /* !__CYGWIN__ */
diff --git a/newlib/libc/ctype/ctype_.h b/newlib/libc/ctype/ctype_.h
new file mode 100644
index 0000000..3b59a27
--- /dev/null
+++ b/newlib/libc/ctype/ctype_.h
@@ -0,0 +1,18 @@
+#include <ctype.h>
+
+#if (defined(__GNUC__) && !defined(__CHAR_UNSIGNED__) && !defined(COMPACT_CTYPE)) || defined (__CYGWIN__)
+#define ALLOW_NEGATIVE_CTYPE_INDEX
+#endif
+
+#ifdef ALLOW_NEGATIVE_CTYPE_INDEX
+
+  extern char _ctype_b[];
+# define DEFAULT_CTYPE_PTR	((char *) _ctype_b + 127)
+
+#else	/* !ALLOW_NEGATIVE_CTYPE_INDEX */
+
+  extern char _ctype_[];
+# define DEFAULT_CTYPE_PTR	((char *) _ctype_)
+
+#endif	/* !ALLOW_NEGATIVE_CTYPE_INDEX */
+
diff --git a/newlib/libc/locale/locale.c b/newlib/libc/locale/locale.c
index fe04395..b7ced4d 100644
--- a/newlib/libc/locale/locale.c
+++ b/newlib/libc/locale/locale.c
@@ -172,13 +172,13 @@ No supporting OS subroutines are required.
 
 #include <newlib.h>
 #include <errno.h>
-#include <ctype.h>
 #include <string.h>
 #include <limits.h>
 #include <reent.h>
 #include <stdlib.h>
 #include <wchar.h>
 #include "setlocale.h"
+#include "../ctype/ctype_.h"
 #include "../stdlib/local.h"
 
 #ifdef __CYGWIN__ /* Has to be kept available as exported symbol for
@@ -225,7 +225,7 @@ const struct __locale_t __C_locale =
   __ascii_wctomb,
   __ascii_mbtowc,
   0,
-  NULL,
+  DEFAULT_CTYPE_PTR,
   {
     ".", "", "", "", "", "", "", "", "", "",
     CHAR_MAX, CHAR_MAX, CHAR_MAX, CHAR_MAX,
@@ -266,7 +266,7 @@ struct __locale_t __global_locale =
   __ascii_mbtowc,
 #endif
   0,
-  NULL,
+  DEFAULT_CTYPE_PTR,
   {
     ".", "", "", "", "", "", "", "", "", "",
     CHAR_MAX, CHAR_MAX, CHAR_MAX, CHAR_MAX,
@@ -901,7 +901,7 @@ restart:
 #endif
       loc->wctomb = l_wctomb;
       loc->mbtowc = l_mbtowc;
-      __set_ctype (loc == __get_global_locale () ? NULL : loc, charset);
+      __set_ctype (loc, charset);
       /* Determine the width for the "CJK Ambiguous Width" category of
          characters. This is used in wcwidth(). Assume single width for
          single-byte charsets, and double width for multi-byte charsets
@@ -988,20 +988,15 @@ _DEFUN_VOID (__locale_mb_cur_max)
 }
 
 const char *
-__locale_ctype_ptr (void)
+__locale_ctype_ptr_l (struct __locale_t *locale)
 {
-  /* Only check if the current thread/reent has a locale.  ctype_ptr is unused
-     in __global_locale, rather the global variable __ctype_ptr__ is used. */
-  extern char *__ctype_ptr__;
-  return __get_locale_r (_REENT) ? __get_locale_r (_REENT)->ctype_ptr
-				 : __ctype_ptr__;
+  return locale->ctype_ptr;
 }
 
 const char *
-__locale_ctype_ptr_l (struct __locale_t *locale)
+__locale_ctype_ptr (void)
 {
-  extern char *__ctype_ptr__;
-  return locale->ctype_ptr ?: __ctype_ptr__;
+  return __get_current_locale (_REENT)->ctype_ptr;
 }
 
 #ifndef _REENT_ONLY
diff --git a/winsup/cygwin/ctype.cc b/winsup/cygwin/ctype.cc
index 3eb6b34..0fe243b 100644
--- a/winsup/cygwin/ctype.cc
+++ b/winsup/cygwin/ctype.cc
@@ -64,10 +64,10 @@ __set_ctype (struct __locale_t *loc, const char *charset)
 	}
       ctype_ptr = (char *) _ctype_b;
     }
-  if (loc)
-    loc->ctype_ptr = ctype_ptr + 127;
-  else
-    __ctype_ptr__ = ctype_ptr + 127;
+  loc->ctype_ptr = ctype_ptr + 127;
+  /* For backward compatibilty */
+  if (loc == __get_global_locale ())
+    __ctype_ptr__ = loc->ctype_ptr;
 }
 
 } /* extern "C" */