gh-108765: Python.h no longer includes <ctype.h> (#108831)

Remove <ctype.h> in C files which don't use it; only sre.c and
_decimal.c still use it.

Remove _PY_PORT_CTYPE_UTF8_ISSUE code from pyport.h:

* Code added by commit b5047fd01948ab108edcc1b3c2c901d915814cfd
  in 2004 for MacOSX and FreeBSD.
* Test removed by commit 52ddaefb6bab1a74ecffe8519c02735794ebfbe1
  in 2007, since Python str type now uses locale independent
  functions like Py_ISALPHA() and Py_TOLOWER() and the Unicode
  database.

Modules/_sre/sre.c replaces _PY_PORT_CTYPE_UTF8_ISSUE with new
functions: sre_isalnum(), sre_tolower(), sre_toupper().

Remove unused includes:

* _localemodule.c: remove <stdio.h>.
* getargs.c: remove <float.h>.
* dynload_win.c: remove <direct.h>, it no longer calls _getcwd()
  since commit fb1f68ed7cc1536482d1debd70a53c5442135fe2 (in 2001).

7 files changed, 57 insertions, 44 deletions

diff --git a/Modules/_localemodule.c b/Modules/_localemodule.c
index 1847a48..fe8e4c5 100644
--- a/Modules/_localemodule.c
+++ b/Modules/_localemodule.c
@@ -10,35 +10,25 @@ This software comes with no warranty. Use at your own risk.
 ******************************************************************/
 
 #include "Python.h"
-#include "pycore_fileutils.h"
-#include "pycore_pymem.h"  // _PyMem_Strdup
-
-#include <stdio.h>
-#include <locale.h>
-#include <string.h>
-#include <ctype.h>
+#include "pycore_fileutils.h"     // _Py_GetLocaleconvNumeric()
+#include "pycore_pymem.h"         // _PyMem_Strdup()
 
+#include <locale.h>               // setlocale()
+#include <string.h>               // strlen()
 #ifdef HAVE_ERRNO_H
-#include <errno.h>
+#  include <errno.h>              // errno
 #endif
-
 #ifdef HAVE_LANGINFO_H
-#include <langinfo.h>
+#  include <langinfo.h>           // nl_langinfo()
 #endif
-
 #ifdef HAVE_LIBINTL_H
-#include <libintl.h>
-#endif
-
-#ifdef HAVE_WCHAR_H
-#include <wchar.h>
+#  include <libintl.h>
 #endif
-
-#if defined(MS_WINDOWS)
-#ifndef WIN32_LEAN_AND_MEAN
-#define WIN32_LEAN_AND_MEAN
-#endif
-#include <windows.h>
+#ifdef MS_WINDOWS
+#  ifndef WIN32_LEAN_AND_MEAN
+#    define WIN32_LEAN_AND_MEAN
+#  endif
+#  include <windows.h>
 #endif
 
 PyDoc_STRVAR(locale__doc__, "Support for POSIX locales.");
diff --git a/Modules/_sre/sre.c b/Modules/_sre/sre.c
index 3872c36..07da5da 100644
--- a/Modules/_sre/sre.c
+++ b/Modules/_sre/sre.c
@@ -43,12 +43,40 @@ static const char copyright[] =
 #include "pycore_long.h"          // _PyLong_GetZero()
 #include "pycore_moduleobject.h"  // _PyModule_GetState()
 
+#include "sre.h"                  // SRE_CODE
 
-#include "sre.h"
+#include <ctype.h>                // tolower(), toupper(), isalnum()
 
 #define SRE_CODE_BITS (8 * sizeof(SRE_CODE))
 
-#include <ctype.h>
+// On macOS, use the wide character ctype API using btowc()
+#if defined(__APPLE__)
+#  define USE_CTYPE_WINT_T
+#endif
+
+static int sre_isalnum(unsigned int ch) {
+#ifdef USE_CTYPE_WINT_T
+    return (unsigned int)iswalnum(btowc((int)ch));
+#else
+    return (unsigned int)isalnum((int)ch);
+#endif
+}
+
+static unsigned int sre_tolower(unsigned int ch) {
+#ifdef USE_CTYPE_WINT_T
+    return (unsigned int)towlower(btowc((int)ch));
+#else
+    return (unsigned int)tolower((int)ch);
+#endif
+}
+
+static unsigned int sre_toupper(unsigned int ch) {
+#ifdef USE_CTYPE_WINT_T
+    return (unsigned int)towupper(btowc((int)ch));
+#else
+    return (unsigned int)toupper((int)ch);
+#endif
+}
 
 /* Defining this one controls tracing:
  * 0 -- disabled
@@ -114,17 +142,17 @@ static unsigned int sre_lower_ascii(unsigned int ch)
 /* locale-specific character predicates */
 /* !(c & ~N) == (c < N+1) for any unsigned c, this avoids
  * warnings when c's type supports only numbers < N+1 */
-#define SRE_LOC_IS_ALNUM(ch) (!((ch) & ~255) ? isalnum((ch)) : 0)
+#define SRE_LOC_IS_ALNUM(ch) (!((ch) & ~255) ? sre_isalnum((ch)) : 0)
 #define SRE_LOC_IS_WORD(ch) (SRE_LOC_IS_ALNUM((ch)) || (ch) == '_')
 
 static unsigned int sre_lower_locale(unsigned int ch)
 {
-    return ((ch) < 256 ? (unsigned int)tolower((ch)) : ch);
+    return ((ch) < 256 ? (unsigned int)sre_tolower((ch)) : ch);
 }
 
 static unsigned int sre_upper_locale(unsigned int ch)
 {
-    return ((ch) < 256 ? (unsigned int)toupper((ch)) : ch);
+    return ((ch) < 256 ? (unsigned int)sre_toupper((ch)) : ch);
 }
 
 /* unicode-specific character predicates */
diff --git a/Modules/_struct.c b/Modules/_struct.c
index be4c23a..1f8f9c4 100644
--- a/Modules/_struct.c
+++ b/Modules/_struct.c
@@ -12,7 +12,6 @@
 #include "pycore_long.h"          // _PyLong_AsByteArray()
 #include "pycore_moduleobject.h"  // _PyModule_GetState()
 
-#include <ctype.h>
 #include <stddef.h>               // offsetof()
 
 /*[clinic input]
diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index 663b411..f9a1864 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -26,15 +26,14 @@ Copyright (C) 1994 Steen Lumholt.
 #endif
 
 #include "Python.h"
-#include <ctype.h>
 #ifdef MS_WINDOWS
 #  include "pycore_fileutils.h"   // _Py_stat()
 #endif
 
-#include "pycore_long.h"
+#include "pycore_long.h"          // _PyLong_IsNegative()
 
 #ifdef MS_WINDOWS
-#include <windows.h>
+#  include <windows.h>
 #endif
 
 #define CHECK_SIZE(size, elemsize) \
@@ -46,11 +45,11 @@ Copyright (C) 1994 Steen Lumholt.
 #define TCL_THREADS
 
 #ifdef TK_FRAMEWORK
-#include <Tcl/tcl.h>
-#include <Tk/tk.h>
+#  include <Tcl/tcl.h>
+#  include <Tk/tk.h>
 #else
-#include <tcl.h>
-#include <tk.h>
+#  include <tcl.h>
+#  include <tk.h>
 #endif
 
 #include "tkinter.h"
diff --git a/Modules/_zoneinfo.c b/Modules/_zoneinfo.c
index 3f7b285..eb4e522 100644
--- a/Modules/_zoneinfo.c
+++ b/Modules/_zoneinfo.c
@@ -6,11 +6,10 @@
 #include "pycore_long.h"          // _PyLong_GetOne()
 #include "pycore_pyerrors.h"      // _PyErr_ChainExceptions1()
 
-#include <ctype.h>
-#include <stddef.h>
-#include <stdint.h>
+#include "datetime.h"             // PyDateTime_TZInfo
 
-#include "datetime.h"
+#include <stddef.h>               // offsetof()
+#include <stdint.h>
 
 #include "clinic/_zoneinfo.c.h"
 /*[clinic input]
diff --git a/Modules/pyexpat.c b/Modules/pyexpat.c
index 52dd06c..bd24523 100644
--- a/Modules/pyexpat.c
+++ b/Modules/pyexpat.c
@@ -7,7 +7,6 @@
 #include "pycore_pyhash.h"        // _Py_HashSecret
 #include "pycore_traceback.h"     // _PyTraceback_Add()
 
-#include <ctype.h>
 #include <stddef.h>               // offsetof()
 #include "expat.h"
 #include "pyexpat.h"
diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index 4e55da7..a2b6652 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -6,22 +6,21 @@
 #include "pycore_namespace.h"     // _PyNamespace_New()
 #include "pycore_runtime.h"       // _Py_ID()
 
-#include <ctype.h>
 #include <time.h>                 // clock()
 #ifdef HAVE_SYS_TIMES_H
-#  include <sys/times.h>
+#  include <sys/times.h>          // times()
 #endif
 #ifdef HAVE_SYS_TYPES_H
 #  include <sys/types.h>
 #endif
 #if defined(HAVE_SYS_RESOURCE_H)
-#  include <sys/resource.h>
+#  include <sys/resource.h>       // getrusage(RUSAGE_SELF)
 #endif
 #ifdef QUICKWIN
 # include <io.h>
 #endif
 #if defined(HAVE_PTHREAD_H)
-#  include <pthread.h>
+#  include <pthread.h>            // pthread_getcpuclockid()
 #endif
 #if defined(_AIX)
 #   include <sys/thread.h>