add readline module with some pyston changes

from_cpython/CMakeLists.txt

@@ -123,6 +123,7 @@ add_custom_command(OUTPUT
                        ${CMAKE_BINARY_DIR}/lib_pyston/bz2.pyston.so
                        ${CMAKE_BINARY_DIR}/lib_pyston/_ctypes.pyston.so
                        ${CMAKE_BINARY_DIR}/lib_pyston/grp.pyston.so
+                       ${CMAKE_BINARY_DIR}/lib_pyston/readline.pyston.so
                        ${CMAKE_BINARY_DIR}/lib_pyston/termios.pyston.so
                        ${CMAKE_BINARY_DIR}/lib_pyston/_curses.pyston.so
                        ${CMAKE_BINARY_DIR}/lib_pyston/mmap.pyston.so
@@ -149,6 +150,7 @@ add_custom_command(OUTPUT
                        Modules/_elementtree.c
 		       Modules/bz2module.c
 		       Modules/grpmodule.c
+		       Modules/readline.c
 		       Modules/termios.c
 		       Modules/_cursesmodule.c
 		       Modules/mmapmodule.c

from_cpython/Modules/readline.c

@@ -1063,8 +1063,10 @@ readline_until_enter_or_signal(char *prompt, int *signal)
 #endif /*defined(HAVE_RL_CALLBACK) && defined(HAVE_SELECT) */
 
 
+// Pyston changes: change the type of 3rd argument from char* to const char*
+// To match the type of Pyston PyOS_ReadlineFunctionPointer.
 static char *
-call_readline(FILE *sys_stdin, FILE *sys_stdout, char *prompt)
+call_readline(FILE *sys_stdin, FILE *sys_stdout, const char *prompt)
 {
     size_t n;
     char *p, *q;
@@ -1085,7 +1087,7 @@ call_readline(FILE *sys_stdin, FILE *sys_stdout, char *prompt)
 #endif
     }
 
-    p = readline_until_enter_or_signal(prompt, &signal);
+    p = readline_until_enter_or_signal((char*)prompt, &signal);
 
     /* we got an interrupt signal */
     if (signal) {
@@ -1167,6 +1169,6 @@ initreadline(void)
     if (m == NULL)
         return;
 
-    PyOS_ReadlineFunctionPointer = call_readline;
+    PyOS_ReadlineFunctionPointer = &call_readline;
     setup_readline();
 }

from_cpython/setup.py

@@ -82,6 +82,12 @@ def curses_ext():
             "Modules/_cursesmodule.c",
             ]), libraries = ['curses'])
 
+@unique
+def readline_ext():
+    return Extension("readline", sources = map(relpath, [
+            "Modules/readline.c",
+            ]))
+
 @unique
 def termios_ext():
     return Extension("termios", sources = map(relpath, [
@@ -142,6 +148,7 @@ ext_modules = [future_builtins_ext(),
                ctypes_test_ext(),
                grp_ext(),
                curses_ext(),
+               readline_ext(),
                termios_ext(),
                mmap_ext(),
                ]