gh-111089: Revert PyUnicode_AsUTF8() changes (#111833)

* Revert "gh-111089: Use PyUnicode_AsUTF8() in Argument Clinic (#111585)"

This reverts commit d9b606b3d04fc56fb0bcc479d7d6c14562edb5e2.

* Revert "gh-111089: Use PyUnicode_AsUTF8() in getargs.c (#111620)"

This reverts commit cde1071b2a72e8261ca66053ef61431b7f3a81fd.

* Revert "gh-111089: PyUnicode_AsUTF8() now raises on embedded NUL (#111091)"

This reverts commit d731579bfb9a497cfb0076cb6b221058a20088fe.

* Revert "gh-111089: Add PyUnicode_AsUTF8() to the limited C API (#111121)"

This reverts commit d8f32be5b6a736dc2fc9dca3f1bf176c82fc9b44.

* Revert "gh-111089: Use PyUnicode_AsUTF8() in sqlite3 (#111122)"

This reverts commit 37e4e20eaa8f27ada926d49e5971fecf0477ad26.

4 files changed, 58 insertions, 13 deletions

diff --git a/Modules/_io/clinic/_iomodule.c.h b/Modules/_io/clinic/_iomodule.c.h
index 68a8a20..112408a 100644
--- a/Modules/_io/clinic/_iomodule.c.h
+++ b/Modules/_io/clinic/_iomodule.c.h
@@ -188,10 +188,15 @@ _io_open(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kw
             _PyArg_BadArgument("open", "argument 'mode'", "str", args[1]);
             goto exit;
         }
-        mode = PyUnicode_AsUTF8(args[1]);
+        Py_ssize_t mode_length;
+        mode = PyUnicode_AsUTF8AndSize(args[1], &mode_length);
         if (mode == NULL) {
             goto exit;
         }
+        if (strlen(mode) != (size_t)mode_length) {
+            PyErr_SetString(PyExc_ValueError, "embedded null character");
+            goto exit;
+        }
         if (!--noptargs) {
             goto skip_optional_pos;
         }
@@ -210,10 +215,15 @@ _io_open(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kw
             encoding = NULL;
         }
         else if (PyUnicode_Check(args[3])) {
-            encoding = PyUnicode_AsUTF8(args[3]);
+            Py_ssize_t encoding_length;
+            encoding = PyUnicode_AsUTF8AndSize(args[3], &encoding_length);
             if (encoding == NULL) {
                 goto exit;
             }
+            if (strlen(encoding) != (size_t)encoding_length) {
+                PyErr_SetString(PyExc_ValueError, "embedded null character");
+                goto exit;
+            }
         }
         else {
             _PyArg_BadArgument("open", "argument 'encoding'", "str or None", args[3]);
@@ -228,10 +238,15 @@ _io_open(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kw
             errors = NULL;
         }
         else if (PyUnicode_Check(args[4])) {
-            errors = PyUnicode_AsUTF8(args[4]);
+            Py_ssize_t errors_length;
+            errors = PyUnicode_AsUTF8AndSize(args[4], &errors_length);
             if (errors == NULL) {
                 goto exit;
             }
+            if (strlen(errors) != (size_t)errors_length) {
+                PyErr_SetString(PyExc_ValueError, "embedded null character");
+                goto exit;
+            }
         }
         else {
             _PyArg_BadArgument("open", "argument 'errors'", "str or None", args[4]);
@@ -246,10 +261,15 @@ _io_open(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kw
             newline = NULL;
         }
         else if (PyUnicode_Check(args[5])) {
-            newline = PyUnicode_AsUTF8(args[5]);
+            Py_ssize_t newline_length;
+            newline = PyUnicode_AsUTF8AndSize(args[5], &newline_length);
             if (newline == NULL) {
                 goto exit;
             }
+            if (strlen(newline) != (size_t)newline_length) {
+                PyErr_SetString(PyExc_ValueError, "embedded null character");
+                goto exit;
+            }
         }
         else {
             _PyArg_BadArgument("open", "argument 'newline'", "str or None", args[5]);
@@ -384,4 +404,4 @@ _io_open_code(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObjec
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=feb173d5f2bfb98a input=a9049054013a1b77]*/
+/*[clinic end generated code: output=5d60f4e778a600a4 input=a9049054013a1b77]*/
diff --git a/Modules/_io/clinic/fileio.c.h b/Modules/_io/clinic/fileio.c.h
index 6f5d660..cf3ba28 100644
--- a/Modules/_io/clinic/fileio.c.h
+++ b/Modules/_io/clinic/fileio.c.h
@@ -107,10 +107,15 @@ _io_FileIO___init__(PyObject *self, PyObject *args, PyObject *kwargs)
             _PyArg_BadArgument("FileIO", "argument 'mode'", "str", fastargs[1]);
             goto exit;
         }
-        mode = PyUnicode_AsUTF8(fastargs[1]);
+        Py_ssize_t mode_length;
+        mode = PyUnicode_AsUTF8AndSize(fastargs[1], &mode_length);
         if (mode == NULL) {
             goto exit;
         }
+        if (strlen(mode) != (size_t)mode_length) {
+            PyErr_SetString(PyExc_ValueError, "embedded null character");
+            goto exit;
+        }
         if (!--noptargs) {
             goto skip_optional_pos;
         }
@@ -523,4 +528,4 @@ _io_FileIO_isatty(fileio *self, PyObject *Py_UNUSED(ignored))
 #ifndef _IO_FILEIO_TRUNCATE_METHODDEF
     #define _IO_FILEIO_TRUNCATE_METHODDEF
 #endif /* !defined(_IO_FILEIO_TRUNCATE_METHODDEF) */
-/*[clinic end generated code: output=27cff9d0a618edb6 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=1c0f4a36f76b0c6a input=a9049054013a1b77]*/
diff --git a/Modules/_io/clinic/textio.c.h b/Modules/_io/clinic/textio.c.h
index 25c301e..b24a166 100644
--- a/Modules/_io/clinic/textio.c.h
+++ b/Modules/_io/clinic/textio.c.h
@@ -185,10 +185,15 @@ _io__TextIOBase_write(PyObject *self, PyTypeObject *cls, PyObject *const *args,
         _PyArg_BadArgument("write", "argument 1", "str", args[0]);
         goto exit;
     }
-    s = PyUnicode_AsUTF8(args[0]);
+    Py_ssize_t s_length;
+    s = PyUnicode_AsUTF8AndSize(args[0], &s_length);
     if (s == NULL) {
         goto exit;
     }
+    if (strlen(s) != (size_t)s_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
+        goto exit;
+    }
     return_value = _io__TextIOBase_write_impl(self, cls, s);
 
 exit:
@@ -470,10 +475,15 @@ _io_TextIOWrapper___init__(PyObject *self, PyObject *args, PyObject *kwargs)
             encoding = NULL;
         }
         else if (PyUnicode_Check(fastargs[1])) {
-            encoding = PyUnicode_AsUTF8(fastargs[1]);
+            Py_ssize_t encoding_length;
+            encoding = PyUnicode_AsUTF8AndSize(fastargs[1], &encoding_length);
             if (encoding == NULL) {
                 goto exit;
             }
+            if (strlen(encoding) != (size_t)encoding_length) {
+                PyErr_SetString(PyExc_ValueError, "embedded null character");
+                goto exit;
+            }
         }
         else {
             _PyArg_BadArgument("TextIOWrapper", "argument 'encoding'", "str or None", fastargs[1]);
@@ -494,10 +504,15 @@ _io_TextIOWrapper___init__(PyObject *self, PyObject *args, PyObject *kwargs)
             newline = NULL;
         }
         else if (PyUnicode_Check(fastargs[3])) {
-            newline = PyUnicode_AsUTF8(fastargs[3]);
+            Py_ssize_t newline_length;
+            newline = PyUnicode_AsUTF8AndSize(fastargs[3], &newline_length);
             if (newline == NULL) {
                 goto exit;
             }
+            if (strlen(newline) != (size_t)newline_length) {
+                PyErr_SetString(PyExc_ValueError, "embedded null character");
+                goto exit;
+            }
         }
         else {
             _PyArg_BadArgument("TextIOWrapper", "argument 'newline'", "str or None", fastargs[3]);
@@ -965,4 +980,4 @@ _io_TextIOWrapper_close(textio *self, PyObject *Py_UNUSED(ignored))
 {
     return _io_TextIOWrapper_close_impl(self);
 }
-/*[clinic end generated code: output=c9ffb48a5278cbd4 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=e58ce89b7354e77a input=a9049054013a1b77]*/
diff --git a/Modules/_io/clinic/winconsoleio.c.h b/Modules/_io/clinic/winconsoleio.c.h
index 8609fc9..6cab295 100644
--- a/Modules/_io/clinic/winconsoleio.c.h
+++ b/Modules/_io/clinic/winconsoleio.c.h
@@ -106,10 +106,15 @@ _io__WindowsConsoleIO___init__(PyObject *self, PyObject *args, PyObject *kwargs)
             _PyArg_BadArgument("_WindowsConsoleIO", "argument 'mode'", "str", fastargs[1]);
             goto exit;
         }
-        mode = PyUnicode_AsUTF8(fastargs[1]);
+        Py_ssize_t mode_length;
+        mode = PyUnicode_AsUTF8AndSize(fastargs[1], &mode_length);
         if (mode == NULL) {
             goto exit;
         }
+        if (strlen(mode) != (size_t)mode_length) {
+            PyErr_SetString(PyExc_ValueError, "embedded null character");
+            goto exit;
+        }
         if (!--noptargs) {
             goto skip_optional_pos;
         }
@@ -452,4 +457,4 @@ _io__WindowsConsoleIO_isatty(winconsoleio *self, PyObject *Py_UNUSED(ignored))
 #ifndef _IO__WINDOWSCONSOLEIO_ISATTY_METHODDEF
     #define _IO__WINDOWSCONSOLEIO_ISATTY_METHODDEF
 #endif /* !defined(_IO__WINDOWSCONSOLEIO_ISATTY_METHODDEF) */
-/*[clinic end generated code: output=76408dd67894bc9c input=a9049054013a1b77]*/
+/*[clinic end generated code: output=04108fc26b187386 input=a9049054013a1b77]*/