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, 13 insertions, 21 deletions

diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 971067e2d4f..8e234e085f1 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -1,7 +1,6 @@
 /* Built-in functions */
 
 #include "Python.h"
-#include <ctype.h>
 #include "pycore_ast.h"           // _PyAST_Validate()
 #include "pycore_call.h"          // _PyObject_CallNoArgs()
 #include "pycore_ceval.h"         // _PyEval_Vector()
diff --git a/Python/ceval.c b/Python/ceval.c
index a22852ec13e..6f90d8e6fd0 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -35,9 +35,7 @@
 #include "pydtrace.h"
 #include "setobject.h"
 
-
-#include <ctype.h>
-#include <stdbool.h>
+#include <stdbool.h>              // bool
 
 #ifdef Py_DEBUG
    /* For debugging the interpreter: */
diff --git a/Python/codecs.c b/Python/codecs.c
index 87ae896b8e7..b79bf555f2f 100644
--- a/Python/codecs.c
+++ b/Python/codecs.c
@@ -14,7 +14,6 @@ Copyright (c) Corporation for National Research Initiatives.
 #include "pycore_pyerrors.h"      // _PyErr_FormatNote()
 #include "pycore_pystate.h"       // _PyInterpreterState_GET()
 #include "pycore_ucnhash.h"       // _PyUnicode_Name_CAPI
-#include <ctype.h>
 
 const char *Py_hexdigits = "0123456789abcdef";
 
diff --git a/Python/dynload_win.c b/Python/dynload_win.c
index acab05e2c6d..f69995b8f9e 100644
--- a/Python/dynload_win.c
+++ b/Python/dynload_win.c
@@ -5,13 +5,8 @@
 #include "pycore_fileutils.h"     // _Py_add_relfile()
 #include "pycore_pystate.h"       // _PyInterpreterState_GET()
 
-#ifdef HAVE_DIRECT_H
-#include <direct.h>
-#endif
-#include <ctype.h>
-
-#include "importdl.h"
-#include "patchlevel.h"
+#include "importdl.h"             // dl_funcptr
+#include "patchlevel.h"           // PY_MAJOR_VERSION
 #include <windows.h>
 
 #ifdef _DEBUG
diff --git a/Python/errors.c b/Python/errors.c
index fb5b3ff2c7b..f670b78c1f1 100644
--- a/Python/errors.c
+++ b/Python/errors.c
@@ -10,7 +10,6 @@
 #include "pycore_sysmodule.h"     // _PySys_Audit()
 #include "pycore_traceback.h"     // _PyTraceBack_FromFrame()
 
-#include <ctype.h>
 #ifdef MS_WINDOWS
 #  include <windows.h>
 #  include <winbase.h>
diff --git a/Python/getargs.c b/Python/getargs.c
index fdc144488c9..cbfe5611111 100644
--- a/Python/getargs.c
+++ b/Python/getargs.c
@@ -7,10 +7,6 @@
 #include "pycore_pylifecycle.h"   // _PyArg_Fini
 #include "pycore_tuple.h"         // _PyTuple_ITEMS()
 
-#include <ctype.h>
-#include <float.h>
-
-
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/Python/mystrtoul.c b/Python/mystrtoul.c
index e6fe154eed6..fcd3e27f17f 100644
--- a/Python/mystrtoul.c
+++ b/Python/mystrtoul.c
@@ -1,16 +1,22 @@
+// strtol() and strtoul(), renamed to avoid conflicts.
+//
+// API:
+//
+// - PyOS_strtol(): convert string to C long integer.
+// - PyOS_strtoul(): convert string to C unsigned long integer.
+
 #include "Python.h"
 #include "pycore_long.h"          // _PyLong_DigitValue
 
 #if defined(__sgi) && !defined(_SGI_MP_SOURCE)
-#define _SGI_MP_SOURCE
+#  define _SGI_MP_SOURCE
 #endif
 
 /* strtol and strtoul, renamed to avoid conflicts */
 
 
-#include <ctype.h>
 #ifdef HAVE_ERRNO_H
-#include <errno.h>
+#  include <errno.h>              // errno
 #endif
 
 /* Static overflow check values for bases 2 through 36.
@@ -75,7 +81,7 @@ static const int digitlimit[] = {
     14,  14, 14, 14, 13, 13, 13, 13, 13, 13,  /* 20 - 29 */
     13,  12, 12, 12, 12, 12, 12};             /* 30 - 36 */
 #else
-#error "Need table for SIZEOF_LONG"
+#  error "Need table for SIZEOF_LONG"
 #endif
 
 /*