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9669 lines (8417 loc) · 290 KB
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/*
* This is a curses module for Python.
*
* Based on prior work by Lance Ellinghaus and Oliver Andrich
* Version 1.2 of this module: Copyright 1994 by Lance Ellinghouse,
* Cathedral City, California Republic, United States of America.
*
* Version 1.5b1, heavily extended for ncurses by Oliver Andrich:
* Copyright 1996,1997 by Oliver Andrich, Koblenz, Germany.
*
* Tidied for Python 1.6, and currently maintained by <amk@amk.ca>.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this source file to use, copy, modify, merge, or publish it
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or in any new file that contains a substantial portion of
* this file.
*
* THE AUTHOR MAKES NO REPRESENTATIONS ABOUT THE SUITABILITY OF
* THE SOFTWARE FOR ANY PURPOSE. IT IS PROVIDED "AS IS" WITHOUT
* EXPRESS OR IMPLIED WARRANTY. THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NON-INFRINGEMENT OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE
* AUTHOR BE LIABLE TO YOU OR ANY OTHER PARTY FOR ANY SPECIAL,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE, STRICT LIABILITY OR
* ANY OTHER ACTION ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/*
A number of SysV or ncurses functions don't have wrappers yet; if you
need a given function, add it and send a patch. See
https://www.python.org/dev/patches/ for instructions on how to submit
patches to Python.
Here's a list of currently unsupported functions:
del_curterm mcprint mvcur restartterm
ripoffline set_curterm setterm
tgetent tgetflag tgetnum tgetstr tgoto tputs
vidattr vidputs
Menu extension (ncurses and probably SYSV):
current_item free_item free_menu item_count item_description
item_index item_init item_name item_opts item_opts_off
item_opts_on item_term item_userptr item_value item_visible
menu_back menu_driver menu_fore menu_format menu_grey
menu_init menu_items menu_mark menu_opts menu_opts_off
menu_opts_on menu_pad menu_pattern menu_request_by_name
menu_request_name menu_spacing menu_sub menu_term menu_userptr
menu_win new_item new_menu pos_menu_cursor post_menu
scale_menu set_current_item set_item_init set_item_opts
set_item_term set_item_userptr set_item_value set_menu_back
set_menu_fore set_menu_format set_menu_grey set_menu_init
set_menu_items set_menu_mark set_menu_opts set_menu_pad
set_menu_pattern set_menu_spacing set_menu_sub set_menu_term
set_menu_userptr set_menu_win set_top_row top_row unpost_menu
Form extension (ncurses and probably SYSV):
current_field data_ahead data_behind dup_field
dynamic_fieldinfo field_arg field_back field_buffer
field_count field_fore field_index field_info field_init
field_just field_opts field_opts_off field_opts_on field_pad
field_status field_term field_type field_userptr form_driver
form_fields form_init form_opts form_opts_off form_opts_on
form_page form_request_by_name form_request_name form_sub
form_term form_userptr form_win free_field free_form
link_field link_fieldtype move_field new_field new_form
new_page pos_form_cursor post_form scale_form
set_current_field set_field_back set_field_buffer
set_field_fore set_field_init set_field_just set_field_opts
set_field_pad set_field_status set_field_term set_field_type
set_field_userptr set_fieldtype_arg set_fieldtype_choice
set_form_fields set_form_init set_form_opts set_form_page
set_form_sub set_form_term set_form_userptr set_form_win
set_max_field set_new_page unpost_form
*/
/* Release Number */
static const char PyCursesVersion[] = "2.2";
/* Includes */
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
#include "pycore_capsule.h" // _PyCapsule_SetTraverse()
#include "pycore_long.h" // _PyLong_GetZero()
#include "pycore_structseq.h" // _PyStructSequence_NewType()
#include "pycore_fileutils.h" // _Py_dup(), _Py_set_inheritable()
#include "pycore_tuple.h" // _PyTuple_HASH_XXPRIME_1
#ifdef __hpux
#define STRICT_SYSV_CURSES
#endif
#define CURSES_MODULE
#include "py_curses.h"
#if defined(HAVE_TERM_H) || defined(__sgi)
/* For termname, longname, putp, tigetflag, tigetnum, tigetstr, tparm
which are not declared in SysV curses and for setupterm. */
#include <term.h>
/* Including <term.h> #defines many common symbols. */
#undef lines
#undef columns
#endif
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif
#if !defined(NCURSES_VERSION) && (defined(sgi) || defined(__sun) || defined(SCO5))
#define STRICT_SYSV_CURSES /* Don't use ncurses extensions */
typedef chtype attr_t; /* No attr_t type is available */
#endif
#if defined(_AIX)
#define STRICT_SYSV_CURSES
#endif
#if defined(HAVE_NCURSESW) && NCURSES_EXT_FUNCS+0 >= 20170401 && NCURSES_EXT_COLORS+0 >= 20170401
#define _NCURSES_EXTENDED_COLOR_FUNCS 1
#else
#define _NCURSES_EXTENDED_COLOR_FUNCS 0
#endif
#if _NCURSES_EXTENDED_COLOR_FUNCS
#define _CURSES_COLOR_VAL_TYPE int
#define _CURSES_COLOR_NUM_TYPE int
#define _CURSES_INIT_COLOR_FUNC init_extended_color
#define _CURSES_INIT_PAIR_FUNC init_extended_pair
#define _COLOR_CONTENT_FUNC extended_color_content
#define _CURSES_PAIR_CONTENT_FUNC extended_pair_content
#else
#define _CURSES_COLOR_VAL_TYPE short
#define _CURSES_COLOR_NUM_TYPE short
#define _CURSES_INIT_COLOR_FUNC init_color
#define _CURSES_INIT_PAIR_FUNC init_pair
#define _COLOR_CONTENT_FUNC color_content
#define _CURSES_PAIR_CONTENT_FUNC pair_content
#endif /* _NCURSES_EXTENDED_COLOR_FUNCS */
typedef struct {
PyObject *error; // curses exception type
PyTypeObject *window_type; // exposed by PyCursesWindow_Type
PyTypeObject *screen_type; // _curses.screen
PyTypeObject *complexchar_type; // _curses.complexchar
PyTypeObject *complexstr_type; // _curses.complexstr
PyObject *topscreen; // owned ref to the current screen object,
// or NULL for the initscr() screen
} cursesmodule_state;
static inline cursesmodule_state *
get_cursesmodule_state(PyObject *module)
{
void *state = PyModule_GetState(module);
assert(state != NULL);
return (cursesmodule_state *)state;
}
static inline cursesmodule_state *
get_cursesmodule_state_by_cls(PyTypeObject *cls)
{
void *state = PyType_GetModuleState(cls);
assert(state != NULL);
return (cursesmodule_state *)state;
}
static inline cursesmodule_state *
get_cursesmodule_state_by_win(PyCursesWindowObject *win)
{
return get_cursesmodule_state_by_cls(Py_TYPE(win));
}
#define _PyCursesWindowObject_CAST(op) ((PyCursesWindowObject *)(op))
#define _PyCursesScreenObject_CAST(op) ((PyCursesScreenObject *)(op))
/*[clinic input]
module _curses
class _curses.window "PyCursesWindowObject *" "clinic_state()->window_type"
class _curses.screen "PyCursesScreenObject *" "clinic_state()->screen_type"
class _curses.complexchar "PyCursesComplexCharObject *" "clinic_state()->complexchar_type"
class _curses.complexstr "PyCursesComplexStrObject *" "get_cursesmodule_state_by_cls(type)->complexstr_type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=e9439fe0a704a26e]*/
/* Indicate whether the module has already been loaded or not. */
static int curses_module_loaded = 0;
/* Tells whether setupterm() has been called to initialise terminfo. */
static int curses_setupterm_called = FALSE;
/* Tells whether initscr() has been called to initialise curses. */
static int curses_initscr_called = FALSE;
/* Tells whether start_color() has been called to initialise color usage. */
static int curses_start_color_called = FALSE;
/* Encoding of the initial screen, used by module-level functions that have
no window object to take it from (e.g. unctrl(), ungetch()). This is a
private copy: the window object that initscr() returns may be deallocated
while these functions are still in use. */
static char *curses_screen_encoding = NULL;
/* Utility Error Procedures */
static void
_curses_format_error(cursesmodule_state *state,
const char *curses_funcname,
const char *python_funcname,
const char *return_value,
const char *default_message)
{
assert(!PyErr_Occurred());
if (python_funcname == NULL && curses_funcname == NULL) {
PyErr_SetString(state->error, default_message);
}
else if (python_funcname == NULL) {
(void)PyErr_Format(state->error, CURSES_ERROR_FORMAT,
curses_funcname, return_value);
}
else {
assert(python_funcname != NULL);
(void)PyErr_Format(state->error, CURSES_ERROR_VERBOSE_FORMAT,
curses_funcname, python_funcname, return_value);
}
}
/*
* Format a curses error for a function that returned ERR.
*
* Specify a non-NULL 'python_funcname' when the latter differs from
* 'curses_funcname'. If both names are NULL, uses the 'catchall_ERR'
* message instead.
*/
static void
_curses_set_error(cursesmodule_state *state,
const char *curses_funcname,
const char *python_funcname)
{
_curses_format_error(state, curses_funcname, python_funcname,
"ERR", catchall_ERR);
}
/*
* Format a curses error for a function that returned NULL.
*
* Specify a non-NULL 'python_funcname' when the latter differs from
* 'curses_funcname'. If both names are NULL, uses the 'catchall_NULL'
* message instead.
*/
static inline void
_curses_set_null_error(cursesmodule_state *state,
const char *curses_funcname,
const char *python_funcname)
{
_curses_format_error(state, curses_funcname, python_funcname,
"NULL", catchall_NULL);
}
/* Same as _curses_set_error() for a module object. */
static void
curses_set_error(PyObject *module,
const char *curses_funcname,
const char *python_funcname)
{
cursesmodule_state *state = get_cursesmodule_state(module);
_curses_set_error(state, curses_funcname, python_funcname);
}
/* Same as _curses_set_null_error() for a module object. */
static void
curses_set_null_error(PyObject *module,
const char *curses_funcname,
const char *python_funcname)
{
cursesmodule_state *state = get_cursesmodule_state(module);
_curses_set_null_error(state, curses_funcname, python_funcname);
}
/* Same as _curses_set_error() for a Window object. */
static void
curses_window_set_error(PyCursesWindowObject *win,
const char *curses_funcname,
const char *python_funcname)
{
cursesmodule_state *state = get_cursesmodule_state_by_win(win);
_curses_set_error(state, curses_funcname, python_funcname);
}
/* Same as _curses_set_null_error() for a Window object. */
static void
curses_window_set_null_error(PyCursesWindowObject *win,
const char *curses_funcname,
const char *python_funcname)
{
cursesmodule_state *state = get_cursesmodule_state_by_win(win);
_curses_set_null_error(state, curses_funcname, python_funcname);
}
/* ncurses and PDCurses store n characters and add a terminator; NetBSD
curses counts the terminator in n. Ask an unknown library for one more. */
#if defined(NCURSES_VERSION) || defined(PDCURSES)
# define CURSES_STR_EXTRA 0
#else
# define CURSES_STR_EXTRA 1
#endif
/* Utility Checking Procedures */
/*
* Function to check that 'funcname' has been called by testing
* the 'called' boolean. If an error occurs, an exception is
* set and this returns 0. Otherwise, this returns 1.
*
* Since this function can be called in functions that do not
* have a direct access to the module's state, '_curses.error'
* is imported on demand.
*
* Use _PyCursesStatefulCheckFunction() if the module is given.
*/
static int
_PyCursesCheckFunction(int called, const char *funcname)
{
if (called == TRUE) {
return 1;
}
PyObject *exc = PyImport_ImportModuleAttrString("_curses", "error");
if (exc != NULL) {
PyErr_Format(exc, CURSES_ERROR_MUST_CALL_FORMAT, funcname);
Py_DECREF(exc);
}
assert(PyErr_Occurred());
return 0;
}
/*
* Function to check that 'funcname' has been called by testing
* the 'called'' boolean. If an error occurs, a PyCursesError is
* set and this returns 0. Otherwise this returns 1.
*
* The exception type is obtained from the 'module' state.
*/
static int
_PyCursesStatefulCheckFunction(PyObject *module,
int called, const char *funcname)
{
if (called == TRUE) {
return 1;
}
cursesmodule_state *state = get_cursesmodule_state(module);
PyErr_Format(state->error, CURSES_ERROR_MUST_CALL_FORMAT, funcname);
return 0;
}
/*
* Function to check that the current screen has a terminal, by testing
* stdscr, which a screen made by new_prescr() does not have. If an error
* occurs, a PyCursesError is set and this returns 0. Otherwise this
* returns 1.
*/
static int
_PyCursesStatefulCheckTerminal(PyObject *module)
{
if (stdscr != NULL) {
return 1;
}
cursesmodule_state *state = get_cursesmodule_state(module);
PyErr_SetString(state->error, "the current screen has no terminal");
return 0;
}
/* Same as _PyCursesStatefulCheckTerminal() for a Window object. */
static int
curses_window_check_terminal(PyCursesWindowObject *win)
{
if (stdscr != NULL) {
return 1;
}
cursesmodule_state *state = get_cursesmodule_state_by_win(win);
PyErr_SetString(state->error, "the current screen has no terminal");
return 0;
}
#define PyCursesStatefulSetupTermCalled(MODULE) \
do { \
if (!_PyCursesStatefulCheckFunction(MODULE, \
curses_setupterm_called, \
"setupterm")) \
{ \
return 0; \
} \
} while (0)
#define PyCursesStatefulInitialised(MODULE) \
do { \
if (!_PyCursesStatefulCheckFunction(MODULE, \
curses_initscr_called, \
"initscr") \
|| !_PyCursesStatefulCheckTerminal(MODULE)) \
{ \
return 0; \
} \
} while (0)
#define PyCursesStatefulInitialisedColor(MODULE) \
do { \
if (!_PyCursesStatefulCheckFunction(MODULE, \
curses_start_color_called, \
"start_color")) \
{ \
return 0; \
} \
} while (0)
/* Utility Functions */
/*
* Check the return code from a curses function, returning None
* on success and setting an exception on error.
*/
/*
* Return None if 'code' is different from ERR (implementation-defined).
* Otherwise, set an exception using curses_set_error() and the remaining
* arguments, and return NULL.
*/
static PyObject *
curses_check_err(PyObject *module, int code,
const char *curses_funcname,
const char *python_funcname)
{
if (code != ERR) {
Py_RETURN_NONE;
}
curses_set_error(module, curses_funcname, python_funcname);
return NULL;
}
/* Same as curses_check_err() for a Window object. */
static PyObject *
curses_window_check_err(PyCursesWindowObject *win, int code,
const char *curses_funcname,
const char *python_funcname)
{
if (code != ERR) {
Py_RETURN_NONE;
}
curses_window_set_error(win, curses_funcname, python_funcname);
return NULL;
}
/* Convert an object to a byte (an integer of type chtype):
- int
- bytes of length 1
- str of length 1
Return 1 on success, 0 on error (invalid type or integer overflow). */
static int
PyCurses_ConvertToChtype(PyCursesWindowObject *win, PyObject *obj, chtype *ch)
{
unsigned long long value;
if (PyBytes_Check(obj)) {
if (PyBytes_GET_SIZE(obj) != 1) {
PyErr_Format(PyExc_TypeError,
"expect int or bytes or str of length 1, "
"got a bytes of length %zd",
PyBytes_GET_SIZE(obj));
return 0;
}
value = (unsigned char)PyBytes_AsString(obj)[0];
}
else if (PyUnicode_Check(obj)) {
if (PyUnicode_GET_LENGTH(obj) != 1) {
PyErr_Format(PyExc_TypeError,
"expect int or bytes or str of length 1, "
"got a str of length %zi",
PyUnicode_GET_LENGTH(obj));
return 0;
}
value = PyUnicode_READ_CHAR(obj, 0);
if (128 < value) {
PyObject *bytes;
const char *encoding;
if (win)
encoding = win->encoding;
else
encoding = curses_screen_encoding;
bytes = PyUnicode_AsEncodedString(obj, encoding, NULL);
if (bytes == NULL)
return 0;
if (PyBytes_GET_SIZE(bytes) != 1) {
Py_DECREF(bytes);
goto overflow;
}
value = (unsigned char)PyBytes_AS_STRING(bytes)[0];
Py_DECREF(bytes);
}
}
else if (PyLong_CheckExact(obj)) {
value = PyLong_AsUnsignedLongLong(obj);
if (value == (unsigned long long)-1 && PyErr_Occurred())
return 0;
}
else {
PyErr_Format(PyExc_TypeError,
"expect int or bytes or str of length 1, got %s",
Py_TYPE(obj)->tp_name);
return 0;
}
*ch = (chtype)value;
if ((unsigned long long)*ch != value)
goto overflow;
return 1;
overflow:
PyErr_SetString(PyExc_OverflowError,
"byte doesn't fit in chtype");
return 0;
}
/* Convert an object to a byte (chtype) or a character (cchar_t):
- int
- bytes of length 1
- str of length 1, or a spacing character followed by up to
CCHARW_MAX - 1 combining characters
Return:
- 2 if obj is a character (written into *wch)
- 1 if obj is a byte (written into *ch)
- 0 on error: raise an exception */
#ifdef HAVE_NCURSESW
/* Convert a str -- a spacing character optionally followed by up to
CCHARW_MAX - 1 combining characters -- into a wide-character cell.
wch must point to a buffer of at least CCHARW_MAX + 1 wide characters.
Return 0 on success, -1 with an exception set on error. */
static int
PyCurses_ConvertToWideCell(PyObject *obj, wchar_t *wch)
{
assert(PyUnicode_Check(obj));
Py_ssize_t nch = PyUnicode_AsWideChar(obj, wch, CCHARW_MAX + 1);
if (nch < 0) {
return -1;
}
if (nch == 0 || nch > CCHARW_MAX) {
PyErr_Format(PyExc_TypeError,
"expect a string of 1 to %d characters, "
"got a str of length %zi",
(int)CCHARW_MAX, PyUnicode_GET_LENGTH(obj));
return -1;
}
/* A lone control character is allowed (like addch(ord('\n'))), but in a
multi-character cell the base must be a printable spacing character and
the rest zero-width combining characters. Check explicitly: otherwise
setcchar() would silently drop a trailing spacing character, or fail
with a generic error for a control-character base. */
if (nch > 1) {
if (wmemchr(wch, L'\0', nch) != NULL) {
PyErr_SetString(PyExc_ValueError, "embedded null character");
return -1;
}
int bad = wcwidth(wch[0]) < 0;
for (Py_ssize_t i = 1; !bad && i < nch; i++) {
bad = wcwidth(wch[i]) != 0;
}
if (bad) {
PyErr_Format(PyExc_ValueError,
"a character cell must be a single spacing character "
"optionally followed by up to %d combining characters",
(int)(CCHARW_MAX - 1));
return -1;
}
}
return 0;
}
#endif
static int
PyCurses_ConvertToCchar_t(PyCursesWindowObject *win, PyObject *obj,
chtype *ch
#ifdef HAVE_NCURSESW
, wchar_t *wch
#endif
)
{
unsigned long long value;
if (PyUnicode_Check(obj)) {
#ifdef HAVE_NCURSESW
if (PyCurses_ConvertToWideCell(obj, wch) < 0) {
return 0;
}
return 2;
#else
return PyCurses_ConvertToChtype(win, obj, ch);
#endif
}
else if (PyBytes_Check(obj)) {
if (PyBytes_GET_SIZE(obj) != 1) {
PyErr_Format(PyExc_TypeError,
"expect int or bytes or str of length 1, "
"got a bytes of length %zd",
PyBytes_GET_SIZE(obj));
return 0;
}
value = (unsigned char)PyBytes_AsString(obj)[0];
}
else if (PyLong_CheckExact(obj)) {
value = PyLong_AsUnsignedLongLong(obj);
if (value == (unsigned long long)-1 && PyErr_Occurred()) {
return 0;
}
}
else {
PyErr_Format(PyExc_TypeError,
"expect int or bytes or str of length 1, got %s",
Py_TYPE(obj)->tp_name);
return 0;
}
*ch = (chtype)value;
if ((unsigned long long)*ch != value) {
PyErr_Format(PyExc_OverflowError,
"byte doesn't fit in chtype");
return 0;
}
return 1;
}
/* Convert an object to a byte string (char*) or a wide character string
(wchar_t*). Return:
- 2 if obj is a character string (written into *wch)
- 1 if obj is a byte string (written into *bytes)
- 0 on error: raise an exception */
static int
PyCurses_ConvertToString(PyCursesWindowObject *win, PyObject *obj,
PyObject **bytes, wchar_t **wstr)
{
char *str;
if (PyUnicode_Check(obj)) {
#ifdef HAVE_NCURSESW
assert (wstr != NULL);
*wstr = PyUnicode_AsWideCharString(obj, NULL);
if (*wstr == NULL)
return 0;
return 2;
#else
assert (wstr == NULL);
*bytes = PyUnicode_AsEncodedString(obj, win->encoding, NULL);
if (*bytes == NULL)
return 0;
/* check for embedded null bytes */
if (PyBytes_AsStringAndSize(*bytes, &str, NULL) < 0) {
Py_CLEAR(*bytes);
return 0;
}
return 1;
#endif
}
else if (PyBytes_Check(obj)) {
*bytes = Py_NewRef(obj);
/* check for embedded null bytes */
if (PyBytes_AsStringAndSize(*bytes, &str, NULL) < 0) {
Py_DECREF(obj);
return 0;
}
return 1;
}
PyErr_Format(PyExc_TypeError, "expect bytes or str, got %s",
Py_TYPE(obj)->tp_name);
return 0;
}
/* A styled character cell: a cchar_t on a wide build, a chtype on a narrow one
(a single locale character ORed with its attributes and color pair).
complexchar wraps one cell, complexstr an array. */
#ifdef HAVE_NCURSESW
typedef cchar_t curses_cell_t;
#else
typedef chtype curses_cell_t;
#endif
typedef struct {
PyObject_HEAD
curses_cell_t cval;
} PyCursesComplexCharObject;
#define _PyCursesComplexCharObject_CAST(op) ((PyCursesComplexCharObject *)(op))
/* An immutable inline array of cells -- the string counterpart of complexchar.
The read functions fill the buffer directly, so read-then-rewrite is a
zero-copy round-trip. */
typedef struct {
PyObject_VAR_HEAD
curses_cell_t cells[1]; // ob_size cells, stored inline (variable-size object)
} PyCursesComplexStrObject;
#define _PyCursesComplexStrObject_CAST(op) ((PyCursesComplexStrObject *)(op))
/* Build a single character cell from obj.
On a wide build, return 1 and store a chtype in *pch for an int or bytes, or
2 and store a cchar_t (with *attr* applied) in *pwc for a str (a spacing
character optionally followed by combining characters). On a narrow build
there is no cchar_t, so always return 1 with a chtype in *pch. Return 0
with an exception set on error.
obj may also be a complexchar, whose cell is used directly; it carries its
own rendition, so supplying *attr* too (attr_given) is rejected. */
static int
PyCurses_ConvertToCell(PyCursesWindowObject *win, PyObject *obj, attr_t attr,
int attr_given, const char *funcname,
chtype *pch
#ifdef HAVE_NCURSESW
, cchar_t *pwc
#endif
)
{
cursesmodule_state *state = get_cursesmodule_state_by_win(win);
if (Py_IS_TYPE(obj, state->complexchar_type)) {
if (attr_given) {
PyErr_Format(PyExc_TypeError,
"%s(): attr cannot be specified together with "
"a complexchar", funcname);
return 0;
}
#ifdef HAVE_NCURSESW
*pwc = _PyCursesComplexCharObject_CAST(obj)->cval;
return 2;
#else
*pch = _PyCursesComplexCharObject_CAST(obj)->cval;
return 1;
#endif
}
#ifdef HAVE_NCURSESW
wchar_t wstr[CCHARW_MAX + 1];
int type = PyCurses_ConvertToCchar_t(win, obj, pch, wstr);
if (type == 2) {
if (setcchar(pwc, wstr, (attr_t)attr, PAIR_NUMBER(attr), NULL) == ERR) {
curses_window_set_error(win, "setcchar", funcname);
return 0;
}
}
return type;
#else
return PyCurses_ConvertToCchar_t(win, obj, pch);
#endif
}
#ifdef HAVE_NCURSESW
/* Pack a wide-character cell, routing the color pair through the
extended-color opts slot so it is not limited to a short (unlike the
chtype COLOR_PAIR field). Without that slot the pair must fit in the
short that setcchar() takes; raise OverflowError instead of silently
truncating a larger one. */
static int
curses_setcchar(cchar_t *wcval, const wchar_t *wstr, attr_t attrs, int pair)
{
#if _NCURSES_EXTENDED_COLOR_FUNCS
/* The pair passed through the opts slot is authoritative and may exceed
a short; ncurses then ignores the short argument, but clamp it into
range so the int-to-short narrowing stays well-defined. */
short spair = pair <= SHRT_MAX ? (short)pair : SHRT_MAX;
return setcchar(wcval, wstr, attrs, spair, &pair);
#else
if (pair > SHRT_MAX) {
PyErr_Format(PyExc_OverflowError,
"color pair %d does not fit in a short", pair);
return ERR;
}
return setcchar(wcval, wstr, attrs, (short)pair, NULL);
#endif
}
/* Unpack a wide-character cell into its text, attributes and color pair.
The pair is read through the extended-color opts slot when available, so
values above SHRT_MAX are preserved. */
static int
curses_getcchar(const cchar_t *wcval, wchar_t *wstr, attr_t *attrs, int *pair)
{
short spair = 0;
/* getcchar() is not guaranteed to write the text of an empty cell, so make
the output an empty string by default. */
wstr[0] = L'\0';
/* getcchar()'s opts slot returns the extended color pair, but ncurses
returned ERR for a non-NULL opts until 6.3 (patch 20210116). */
#if _NCURSES_EXTENDED_COLOR_FUNCS && NCURSES_VERSION_PATCH+0 >= 20210116
int rtn = getcchar(wcval, wstr, attrs, &spair, pair);
#else
int rtn = getcchar(wcval, wstr, attrs, &spair, NULL);
if (rtn != ERR) {
*pair = spair;
}
#endif
if (rtn != ERR) {
*attrs &= ~(attr_t)A_COLOR;
}
return rtn;
}
/* Hash one cell by value (text, attributes, pair) -- consistent with the
equality comparison, not the raw cchar_t whose padding and unused text tail
it ignores. Zero the key first so those bytes are deterministic, then
unpack into it. Returns -1 with an exception set on the (practically
impossible) getcchar() failure. */
static Py_hash_t
curses_cchar_hash(cursesmodule_state *state, const cchar_t *cell)
{
struct {
attr_t attrs;
int pair;
wchar_t wstr[CCHARW_MAX + 1];
} key;
memset(&key, 0, sizeof(key));
if (curses_getcchar(cell, key.wstr, &key.attrs, &key.pair) == ERR) {
PyErr_SetString(state->error, "getcchar() returned ERR");
return -1;
}
return Py_HashBuffer(&key, sizeof(key));
}
#endif
/* ---- Build-agnostic cell helpers over curses_cell_t -------------------- */
/* Pack a cell's text (a str), attributes and color pair into *cell. On a
narrow build the text must be one character that encodes to a single byte.
Return 0, or -1 with an exception set. */
static int
curses_cell_pack(cursesmodule_state *state, curses_cell_t *cell,
PyObject *text, attr_t attr, int pair, const char *funcname)
{
#ifdef HAVE_NCURSESW
wchar_t wstr[CCHARW_MAX + 1];
if (PyCurses_ConvertToWideCell(text, wstr) < 0) {
return -1;
}
if (curses_setcchar(cell, wstr, attr, pair) == ERR) {
if (!PyErr_Occurred()) {
PyErr_SetString(state->error, "setcchar() returned ERR");
}
return -1;
}
return 0;
#else
/* A narrow cell holds one character; reject a longer string with the same
ValueError as the wide build, so the exception type is build-independent. */
if (PyUnicode_GET_LENGTH(text) != 1) {
PyErr_SetString(PyExc_ValueError,
"a character cell must be a single character");
return -1;
}
chtype ch;
if (!PyCurses_ConvertToChtype(NULL, text, &ch)) {
return -1;
}
/* Reject a pair that COLOR_PAIR()/PAIR_NUMBER() cannot round-trip (assumes
only that they are inverses). A wide build, or color_set(), can use
larger pairs. */
chtype color = COLOR_PAIR(pair);
if (pair < 0 || PAIR_NUMBER(color) != pair) {
PyErr_Format(PyExc_OverflowError,
"%s(): color pair %d does not fit in a chtype "
"(color_pair() can encode only pairs 0 to %d)",
funcname, pair, (int)PAIR_NUMBER(A_COLOR));
return -1;
}
*cell = (ch & A_CHARTEXT) | (attr & ~(attr_t)A_COLOR) | color;
return 0;
#endif
}
/* Read a cell's attributes and color pair. Return 0, or -1 if wide getcchar()
fails (practically impossible). */
static int
curses_cell_attr_pair(cursesmodule_state *state, const curses_cell_t *cell,
attr_t *attr, int *pair)
{
#ifdef HAVE_NCURSESW
wchar_t wstr[CCHARW_MAX + 1];
if (curses_getcchar(cell, wstr, attr, pair) == ERR) {
PyErr_SetString(state->error, "getcchar() returned ERR");
return -1;
}
return 0;
#else
*attr = *cell & A_ATTRIBUTES & ~(attr_t)A_COLOR;
*pair = PAIR_NUMBER(*cell & A_COLOR);
return 0;
#endif
}
/* Build a str from a cell's text (decoding the stored byte on a narrow build).
Return a new reference, or NULL with an exception set. */
static PyObject *
curses_cell_text(cursesmodule_state *state, const curses_cell_t *cell)
{
#ifdef HAVE_NCURSESW
wchar_t wstr[CCHARW_MAX + 1];
attr_t attr;
int pair;
if (curses_getcchar(cell, wstr, &attr, &pair) == ERR) {
PyErr_SetString(state->error, "getcchar() returned ERR");
return NULL;
}
/* setcchar() stores no text for a NUL (it takes a NUL-terminated string),
so an empty cell holds a NUL character, as on a narrow build. */
return PyUnicode_FromWideChar(wstr, wstr[0] == L'\0' ? 1 : -1);
#else
char ch = (char)(*cell & A_CHARTEXT);
return PyUnicode_Decode(&ch, 1, curses_screen_encoding, NULL);
#endif
}
/* Compare two cells by value (text, attributes, pair). Return 1, 0, or -1 if
wide getcchar() fails (practically impossible). */
static int
curses_cell_equal(cursesmodule_state *state, const curses_cell_t *a,
const curses_cell_t *b)
{
#ifdef HAVE_NCURSESW
wchar_t wa[CCHARW_MAX + 1], wb[CCHARW_MAX + 1];
attr_t aa, ab;
int pa, pb;
if (curses_getcchar(a, wa, &aa, &pa) == ERR ||
curses_getcchar(b, wb, &ab, &pb) == ERR)
{
PyErr_SetString(state->error, "getcchar() returned ERR");
return -1;
}
return (aa == ab && pa == pb && wcscmp(wa, wb) == 0);
#else
return *a == *b;
#endif
}
/* Hash a cell by value, consistent with curses_cell_equal. */
static Py_hash_t
curses_cell_hash(cursesmodule_state *state, const curses_cell_t *cell)
{
#ifdef HAVE_NCURSESW
return curses_cchar_hash(state, cell);
#else
Py_hash_t h = Py_HashBuffer(cell, sizeof(*cell));
return h == -1 ? -2 : h;
#endif
}
static int
color_allow_default_converter(PyObject *arg, void *ptr)
{
long color_number;
int overflow;
color_number = PyLong_AsLongAndOverflow(arg, &overflow);
if (color_number == -1 && PyErr_Occurred())
return 0;
if (overflow > 0 || color_number >= COLORS) {
PyErr_Format(PyExc_ValueError,
"Color number is greater than COLORS-1 (%d).",
COLORS - 1);
return 0;
}
else if (overflow < 0 || color_number < 0) {
color_number = -1;
}
*(int *)ptr = (int)color_number;
return 1;
}
static int
color_converter(PyObject *arg, void *ptr)
{
if (!color_allow_default_converter(arg, ptr)) {
return 0;
}
if (*(int *)ptr < 0) {
PyErr_SetString(PyExc_ValueError,
"Color number is less than 0.");
return 0;
}
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