add missing pointer cast for coercion from "signed char*" to Python strings

Cython/Compiler/PyrexTypes.py

@@ -2145,15 +2145,16 @@ class CPointerBaseType(CType):
                 self.is_pyunicode_ptr = 1
 
         if self.is_string and not base_type.is_error:
-            if base_type.signed:
-                self.to_py_function = "__Pyx_PyObject_FromString"
-                if self.is_ptr:
             if base_type.signed == 2:
+                self.to_py_function = "__Pyx_PyObject_FromCString"
+                if self.is_ptr:
                     self.from_py_function = "__Pyx_PyObject_AsSString"
-                    else:
+            elif base_type.signed:
+                self.to_py_function = "__Pyx_PyObject_FromString"
+                if self.is_ptr:
                     self.from_py_function = "__Pyx_PyObject_AsString"
             else:
-                self.to_py_function = "__Pyx_PyObject_FromUString"
+                self.to_py_function = "__Pyx_PyObject_FromCString"
                 if self.is_ptr:
                     self.from_py_function = "__Pyx_PyObject_AsUString"
             self.exception_value = "NULL"

Cython/Utility/TypeConversion.c

@@ -32,11 +32,11 @@ static CYTHON_INLINE PyObject* __Pyx_PyUnicode_FromString(const char*);
 
 #define __Pyx_PyObject_AsSString(s)    ((signed char*) __Pyx_PyObject_AsString(s))
 #define __Pyx_PyObject_AsUString(s)    ((unsigned char*) __Pyx_PyObject_AsString(s))
-#define __Pyx_PyObject_FromUString(s)  __Pyx_PyObject_FromString((const char*)s)
-#define __Pyx_PyBytes_FromUString(s)   __Pyx_PyBytes_FromString((const char*)s)
-#define __Pyx_PyByteArray_FromUString(s)   __Pyx_PyByteArray_FromString((const char*)s)
-#define __Pyx_PyStr_FromUString(s)     __Pyx_PyStr_FromString((const char*)s)
-#define __Pyx_PyUnicode_FromUString(s) __Pyx_PyUnicode_FromString((const char*)s)
+#define __Pyx_PyObject_FromCString(s)  __Pyx_PyObject_FromString((const char*)s)
+#define __Pyx_PyBytes_FromCString(s)   __Pyx_PyBytes_FromString((const char*)s)
+#define __Pyx_PyByteArray_FromCString(s)   __Pyx_PyByteArray_FromString((const char*)s)
+#define __Pyx_PyStr_FromCString(s)     __Pyx_PyStr_FromString((const char*)s)
+#define __Pyx_PyUnicode_FromCString(s) __Pyx_PyUnicode_FromString((const char*)s)
 
 #if PY_MAJOR_VERSION < 3
 static CYTHON_INLINE size_t __Pyx_Py_UNICODE_strlen(const Py_UNICODE *u)