gh-106320: Remove more private _PyUnicode C API functions (#106382)

Remove more private _PyUnicode C API functions:
move them to the internal C API (pycore_unicodeobject.h).

No longer export most pycore_unicodeobject.h functions.

Include/cpython/unicodeobject.h

@@ -394,11 +394,6 @@ static inline int PyUnicode_READY(PyObject* Py_UNUSED(op))
 }
 #define PyUnicode_READY(op) PyUnicode_READY(_PyObject_CAST(op))
 
-/* Get a copy of a Unicode string. */
-PyAPI_FUNC(PyObject*) _PyUnicode_Copy(
-    PyObject *unicode
-    );
-
 /* Copy character from one unicode object into another, this function performs
    character conversion when necessary and falls back to memcpy() if possible.
 
@@ -425,17 +420,6 @@ PyAPI_FUNC(Py_ssize_t) PyUnicode_CopyCharacters(
     Py_ssize_t how_many
     );
 
-/* Unsafe version of PyUnicode_CopyCharacters(): don't check arguments and so
-   may crash if parameters are invalid (e.g. if the output string
-   is too short). */
-PyAPI_FUNC(void) _PyUnicode_FastCopyCharacters(
-    PyObject *to,
-    Py_ssize_t to_start,
-    PyObject *from,
-    Py_ssize_t from_start,
-    Py_ssize_t how_many
-    );
-
 /* Fill a string with a character: write fill_char into
    unicode[start:start+length].
 
@@ -451,15 +435,6 @@ PyAPI_FUNC(Py_ssize_t) PyUnicode_Fill(
     Py_UCS4 fill_char
     );
 
-/* Unsafe version of PyUnicode_Fill(): don't check arguments and so may crash
-   if parameters are invalid (e.g. if length is longer than the string). */
-PyAPI_FUNC(void) _PyUnicode_FastFill(
-    PyObject *unicode,
-    Py_ssize_t start,
-    Py_ssize_t length,
-    Py_UCS4 fill_char
-    );
-
 /* Create a new string from a buffer of Py_UCS1, Py_UCS2 or Py_UCS4 characters.
    Scan the string to find the maximum character. */
 PyAPI_FUNC(PyObject*) PyUnicode_FromKindAndData(
@@ -467,19 +442,6 @@ PyAPI_FUNC(PyObject*) PyUnicode_FromKindAndData(
     const void *buffer,
     Py_ssize_t size);
 
-/* Create a new string from a buffer of ASCII characters.
-   WARNING: Don't check if the string contains any non-ASCII character. */
-PyAPI_FUNC(PyObject*) _PyUnicode_FromASCII(
-    const char *buffer,
-    Py_ssize_t size);
-
-/* Compute the maximum character of the substring unicode[start:end].
-   Return 127 for an empty string. */
-PyAPI_FUNC(Py_UCS4) _PyUnicode_FindMaxChar (
-    PyObject *unicode,
-    Py_ssize_t start,
-    Py_ssize_t end);
-
 /* --- Manage the default encoding ---------------------------------------- */
 
 /* Returns a pointer to the default encoding (UTF-8) of the
@@ -618,37 +580,6 @@ PyAPI_FUNC(PyObject*) _PyUnicode_TransformDecimalAndSpaceToASCII(
     PyObject *unicode           /* Unicode object */
     );
 
-/* --- Methods & Slots ---------------------------------------------------- */
-
-PyAPI_FUNC(PyObject *) _PyUnicode_JoinArray(
-    PyObject *separator,
-    PyObject *const *items,
-    Py_ssize_t seqlen
-    );
-
-/* Test whether a unicode is equal to ASCII identifier.  Return 1 if true,
-   0 otherwise.  The right argument must be ASCII identifier.
-   Any error occurs inside will be cleared before return. */
-PyAPI_FUNC(int) _PyUnicode_EqualToASCIIId(
-    PyObject *left,             /* Left string */
-    _Py_Identifier *right       /* Right identifier */
-    );
-
-/* Test whether a unicode is equal to ASCII string.  Return 1 if true,
-   0 otherwise.  The right argument must be ASCII-encoded string.
-   Any error occurs inside will be cleared before return. */
-PyAPI_FUNC(int) _PyUnicode_EqualToASCIIString(
-    PyObject *left,
-    const char *right           /* ASCII-encoded string */
-    );
-
-/* Externally visible for str.strip(unicode) */
-PyAPI_FUNC(PyObject *) _PyUnicode_XStrip(
-    PyObject *self,
-    int striptype,
-    PyObject *sepobj
-    );
-
 /* === Characters Type APIs =============================================== */
 
 /* These should not be used directly. Use the Py_UNICODE_IS* and

Include/internal/pycore_unicodeobject.h

@@ -14,6 +14,44 @@ extern "C" {
 void _PyUnicode_ExactDealloc(PyObject *op);
 Py_ssize_t _PyUnicode_InternedSize(void);
 
+/* Get a copy of a Unicode string. */
+PyAPI_FUNC(PyObject*) _PyUnicode_Copy(
+    PyObject *unicode
+    );
+
+/* Unsafe version of PyUnicode_Fill(): don't check arguments and so may crash
+   if parameters are invalid (e.g. if length is longer than the string). */
+extern void _PyUnicode_FastFill(
+    PyObject *unicode,
+    Py_ssize_t start,
+    Py_ssize_t length,
+    Py_UCS4 fill_char
+    );
+
+/* Unsafe version of PyUnicode_CopyCharacters(): don't check arguments and so
+   may crash if parameters are invalid (e.g. if the output string
+   is too short). */
+extern void _PyUnicode_FastCopyCharacters(
+    PyObject *to,
+    Py_ssize_t to_start,
+    PyObject *from,
+    Py_ssize_t from_start,
+    Py_ssize_t how_many
+    );
+
+/* Create a new string from a buffer of ASCII characters.
+   WARNING: Don't check if the string contains any non-ASCII character. */
+extern PyObject* _PyUnicode_FromASCII(
+    const char *buffer,
+    Py_ssize_t size);
+
+/* Compute the maximum character of the substring unicode[start:end].
+   Return 127 for an empty string. */
+extern Py_UCS4 _PyUnicode_FindMaxChar (
+    PyObject *unicode,
+    Py_ssize_t start,
+    Py_ssize_t end);
+
 /* --- _PyUnicodeWriter API ----------------------------------------------- */
 
 typedef struct {
@@ -141,10 +179,40 @@ PyAPI_FUNC(int) _PyUnicode_FormatAdvancedWriter(
 
 /* --- Methods & Slots ---------------------------------------------------- */
 
+extern PyObject* _PyUnicode_JoinArray(
+    PyObject *separator,
+    PyObject *const *items,
+    Py_ssize_t seqlen
+    );
+
+/* Test whether a unicode is equal to ASCII identifier.  Return 1 if true,
+   0 otherwise.  The right argument must be ASCII identifier.
+   Any error occurs inside will be cleared before return. */
+extern int _PyUnicode_EqualToASCIIId(
+    PyObject *left,             /* Left string */
+    _Py_Identifier *right       /* Right identifier */
+    );
+
+/* Test whether a unicode is equal to ASCII string.  Return 1 if true,
+   0 otherwise.  The right argument must be ASCII-encoded string.
+   Any error occurs inside will be cleared before return. */
+PyAPI_FUNC(int) _PyUnicode_EqualToASCIIString(
+    PyObject *left,
+    const char *right           /* ASCII-encoded string */
+    );
+
+/* Externally visible for str.strip(unicode) */
+extern PyObject* _PyUnicode_XStrip(
+    PyObject *self,
+    int striptype,
+    PyObject *sepobj
+    );
+
+
 /* Using explicit passed-in values, insert the thousands grouping
    into the string pointed to by buffer.  For the argument descriptions,
    see Objects/stringlib/localeutil.h */
-PyAPI_FUNC(Py_ssize_t) _PyUnicode_InsertThousandsGrouping(
+extern Py_ssize_t _PyUnicode_InsertThousandsGrouping(
     _PyUnicodeWriter *writer,
     Py_ssize_t n_buffer,
     PyObject *digits,

Python/future.c

@@ -1,5 +1,6 @@
 #include "Python.h"
 #include "pycore_ast.h"           // _PyAST_GetDocString()
+#include "pycore_unicodeobject.h" // _PyUnicode_EqualToASCIIString()
 
 #define UNDEFINED_FUTURE_FEATURE "future feature %.100s is not defined"