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

Replace PyUnicode_AsUTF8AndSize() with PyUnicode_AsUTF8() to remove
the explicit check for embedded null characters.

The change avoids to have to include explicitly <string.h> to get the
strlen() function when using a recent version of the limited C API.

3 files changed, 6 insertions, 21 deletions

diff --git a/Python/clinic/Python-tokenize.c.h b/Python/clinic/Python-tokenize.c.h
index 730fa8e..7417020 100644
--- a/Python/clinic/Python-tokenize.c.h
+++ b/Python/clinic/Python-tokenize.c.h
@@ -65,19 +65,14 @@ tokenizeriter_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
         _PyArg_BadArgument("tokenizeriter", "argument 'encoding'", "str", fastargs[2]);
         goto exit;
     }
-    Py_ssize_t encoding_length;
-    encoding = PyUnicode_AsUTF8AndSize(fastargs[2], &encoding_length);
+    encoding = PyUnicode_AsUTF8(fastargs[2]);
     if (encoding == NULL) {
         goto exit;
     }
-    if (strlen(encoding) != (size_t)encoding_length) {
-        PyErr_SetString(PyExc_ValueError, "embedded null character");
-        goto exit;
-    }
 skip_optional_kwonly:
     return_value = tokenizeriter_new_impl(type, readline, extra_tokens, encoding);
 
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=dcd6ec48f06a092e input=a9049054013a1b77]*/
+/*[clinic end generated code: output=92cb8176149f0924 input=a9049054013a1b77]*/
diff --git a/Python/clinic/bltinmodule.c.h b/Python/clinic/bltinmodule.c.h
index 8d40e65..4fb06bd 100644
--- a/Python/clinic/bltinmodule.c.h
+++ b/Python/clinic/bltinmodule.c.h
@@ -329,15 +329,10 @@ builtin_compile(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObj
         _PyArg_BadArgument("compile", "argument 'mode'", "str", args[2]);
         goto exit;
     }
-    Py_ssize_t mode_length;
-    mode = PyUnicode_AsUTF8AndSize(args[2], &mode_length);
+    mode = PyUnicode_AsUTF8(args[2]);
     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;
     }
@@ -1212,4 +1207,4 @@ builtin_issubclass(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=31bded5d08647a57 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=95d3813b1798f018 input=a9049054013a1b77]*/
diff --git a/Python/clinic/sysmodule.c.h b/Python/clinic/sysmodule.c.h
index 98717ec..571a34b 100644
--- a/Python/clinic/sysmodule.c.h
+++ b/Python/clinic/sysmodule.c.h
@@ -1259,15 +1259,10 @@ sys_activate_stack_trampoline(PyObject *module, PyObject *arg)
         _PyArg_BadArgument("activate_stack_trampoline", "argument", "str", arg);
         goto exit;
     }
-    Py_ssize_t backend_length;
-    backend = PyUnicode_AsUTF8AndSize(arg, &backend_length);
+    backend = PyUnicode_AsUTF8(arg);
     if (backend == NULL) {
         goto exit;
     }
-    if (strlen(backend) != (size_t)backend_length) {
-        PyErr_SetString(PyExc_ValueError, "embedded null character");
-        goto exit;
-    }
     return_value = sys_activate_stack_trampoline_impl(module, backend);
 
 exit:
@@ -1452,4 +1447,4 @@ exit:
 #ifndef SYS_GETANDROIDAPILEVEL_METHODDEF
     #define SYS_GETANDROIDAPILEVEL_METHODDEF
 #endif /* !defined(SYS_GETANDROIDAPILEVEL_METHODDEF) */
-/*[clinic end generated code: output=f36d45c829250775 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=cdfb714878deeaf1 input=a9049054013a1b77]*/