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use libc::{c_char, c_int, c_long, c_uchar};
use object::PyObject;

#[cfg_attr(windows, link(name = "pythonXY"))]
extern "C" {
    pub fn PyImport_GetMagicNumber() -> c_long;
    pub fn PyImport_GetMagicTag() -> *const c_char;
    pub fn PyImport_ExecCodeModule(name: *const c_char, co: *mut PyObject) -> *mut PyObject;
    pub fn PyImport_ExecCodeModuleEx(
        name: *const c_char,
        co: *mut PyObject,
        pathname: *const c_char,
    ) -> *mut PyObject;
    pub fn PyImport_ExecCodeModuleWithPathnames(
        name: *const c_char,
        co: *mut PyObject,
        pathname: *const c_char,
        cpathname: *const c_char,
    ) -> *mut PyObject;
    pub fn PyImport_ExecCodeModuleObject(
        name: *mut PyObject,
        co: *mut PyObject,
        pathname: *mut PyObject,
        cpathname: *mut PyObject,
    ) -> *mut PyObject;
    pub fn PyImport_GetModuleDict() -> *mut PyObject;
    #[cfg(Py_3_7)]
    pub fn PyImport_GetModule(name: *mut PyObject) -> *mut PyObject;
    pub fn PyImport_AddModuleObject(name: *mut PyObject) -> *mut PyObject;
    pub fn PyImport_AddModule(name: *const c_char) -> *mut PyObject;
    pub fn PyImport_ImportModule(name: *const c_char) -> *mut PyObject;
    pub fn PyImport_ImportModuleNoBlock(name: *const c_char) -> *mut PyObject;
    pub fn PyImport_ImportModuleLevel(
        name: *const c_char,
        globals: *mut PyObject,
        locals: *mut PyObject,
        fromlist: *mut PyObject,
        level: c_int,
    ) -> *mut PyObject;
    pub fn PyImport_ImportModuleLevelObject(
        name: *mut PyObject,
        globals: *mut PyObject,
        locals: *mut PyObject,
        fromlist: *mut PyObject,
        level: c_int,
    ) -> *mut PyObject;
}

#[inline]
pub unsafe fn PyImport_ImportModuleEx(
    name: *const c_char,
    globals: *mut PyObject,
    locals: *mut PyObject,
    fromlist: *mut PyObject,
) -> *mut PyObject {
    PyImport_ImportModuleLevel(name, globals, locals, fromlist, 0)
}

#[cfg_attr(windows, link(name = "pythonXY"))]
extern "C" {
    pub fn PyImport_GetImporter(path: *mut PyObject) -> *mut PyObject;
    pub fn PyImport_Import(name: *mut PyObject) -> *mut PyObject;
    pub fn PyImport_ReloadModule(m: *mut PyObject) -> *mut PyObject;
    pub fn PyImport_Cleanup() -> ();
    pub fn PyImport_ImportFrozenModuleObject(name: *mut PyObject) -> c_int;
    pub fn PyImport_ImportFrozenModule(name: *const c_char) -> c_int;

    // pub static mut PyNullImporter_Type: PyTypeObject; -- does not actually exist in shared library

    pub fn PyImport_AppendInittab(
        name: *const c_char,
        initfunc: Option<unsafe extern "C" fn() -> *mut PyObject>,
    ) -> c_int;
}

#[repr(C)]
#[derive(Copy, Clone)]
#[cfg(not(Py_LIMITED_API))]
pub struct _inittab {
    pub name: *mut c_char,
    pub initfunc: Option<unsafe extern "C" fn()>,
}

#[repr(C)]
#[derive(Copy, Clone)]
#[cfg(not(Py_LIMITED_API))]
pub struct _frozen {
    pub name: *const c_char,
    pub code: *const c_uchar,
    pub size: c_int,
}

#[cfg(not(Py_LIMITED_API))]
#[cfg_attr(windows, link(name = "pythonXY"))]
extern "C" {
    pub static mut PyImport_FrozenModules: *const _frozen;
    pub static mut PyImport_Inittab: *mut _inittab;

    pub fn PyImport_ExtendInittab(newtab: *const _inittab) -> c_int;
}