Add const to some strings that are not modified

Include/pyerrors.h

@@ -167,10 +167,10 @@ PyAPI_FUNC(PyObject *) PyErr_NoMemory(void);
 PyAPI_FUNC(PyObject *) PyErr_SetFromErrno(PyObject *);
 PyAPI_FUNC(PyObject *) PyErr_SetFromErrnoWithFilenameObject(
 	PyObject *, PyObject *);
-PyAPI_FUNC(PyObject *) PyErr_SetFromErrnoWithFilename(PyObject *, char *);
+PyAPI_FUNC(PyObject *) PyErr_SetFromErrnoWithFilename(PyObject *, const char *);
 #ifdef Py_WIN_WIDE_FILENAMES
 PyAPI_FUNC(PyObject *) PyErr_SetFromErrnoWithUnicodeFilename(
-	PyObject *, Py_UNICODE *);
+	PyObject *, const Py_UNICODE *);
 #endif /* Py_WIN_WIDE_FILENAMES */
 
 PyAPI_FUNC(PyObject *) PyErr_Format(PyObject *, const char *, ...);
@@ -198,13 +198,13 @@ PyAPI_FUNC(PyObject *) PyErr_SetExcFromWindowsErr(PyObject *, int);
 
 /* Export the old function so that the existing API remains available: */
 PyAPI_FUNC(void) PyErr_BadInternalCall(void);
-PyAPI_FUNC(void) _PyErr_BadInternalCall(char *filename, int lineno);
+PyAPI_FUNC(void) _PyErr_BadInternalCall(const char *filename, int lineno);
 /* Mask the old API with a call to the new API for code compiled under
    Python 2.0: */
 #define PyErr_BadInternalCall() _PyErr_BadInternalCall(__FILE__, __LINE__)
 
 /* Function to create a new exception */
-PyAPI_FUNC(PyObject *) PyErr_NewException(char *name, PyObject *base,
+PyAPI_FUNC(PyObject *) PyErr_NewException(const char *name, PyObject *base,
                                          PyObject *dict);
 PyAPI_FUNC(void) PyErr_WriteUnraisable(PyObject *);
 

Python/errors.c

@@ -348,7 +348,7 @@ PyErr_SetFromErrnoWithFilenameObject(PyObject *exc, PyObject *filenameObject)
 
 
 PyObject *
-PyErr_SetFromErrnoWithFilename(PyObject *exc, char *filename)
+PyErr_SetFromErrnoWithFilename(PyObject *exc, const char *filename)
 {
 	PyObject *name = filename ? PyUnicode_FromString(filename) : NULL;
 	PyObject *result = PyErr_SetFromErrnoWithFilenameObject(exc, name);
@@ -358,7 +358,7 @@ PyErr_SetFromErrnoWithFilename(PyObject *exc, char *filename)
 
 #ifdef Py_WIN_WIDE_FILENAMES
 PyObject *
-PyErr_SetFromErrnoWithUnicodeFilename(PyObject *exc, Py_UNICODE *filename)
+PyErr_SetFromErrnoWithUnicodeFilename(PyObject *exc, const Py_UNICODE *filename)
 {
 	PyObject *name = filename ?
 	                 PyUnicode_FromUnicode(filename, wcslen(filename)) :
@@ -494,7 +494,7 @@ PyObject *PyErr_SetFromWindowsErrWithUnicodeFilename(
 #endif /* MS_WINDOWS */
 
 void
-_PyErr_BadInternalCall(char *filename, int lineno)
+_PyErr_BadInternalCall(const char *filename, int lineno)
 {
 	PyErr_Format(PyExc_SystemError,
 		     "%s:%d: bad argument to internal function",
@@ -536,9 +536,9 @@ PyErr_Format(PyObject *exception, const char *format, ...)
 
 
 PyObject *
-PyErr_NewException(char *name, PyObject *base, PyObject *dict)
+PyErr_NewException(const char *name, PyObject *base, PyObject *dict)
 {
-	char *dot;
+	const char *dot;
 	PyObject *modulename = NULL;
 	PyObject *classname = NULL;
 	PyObject *mydict = NULL;