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qemu/ui/curses.c
Philippe Mathieu-Daudé 2d5f4a713d ui/curses: Avoid dynamic stack allocation 
Use autofree heap allocation instead of variable-length
array on the stack.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20220819153931.3147384-11-peter.maydell@linaro.org
2022-09-22 16:38:28 +01:00

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/*
* QEMU curses/ncurses display driver
*
* Copyright (c) 2005 Andrzej Zaborowski <balrog@zabor.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#ifndef _WIN32
#include <sys/ioctl.h>
#include <termios.h>
#endif
#include <locale.h>
#include <wchar.h>
#include <iconv.h>
#include "qapi/error.h"
#include "qemu/module.h"
#include "ui/console.h"
#include "ui/input.h"
#include "sysemu/sysemu.h"
#if defined(__APPLE__) || defined(__OpenBSD__)
#define _XOPEN_SOURCE_EXTENDED 1
#endif
/* KEY_EVENT is defined in wincon.h and in curses.h. Avoid redefinition. */
#undef KEY_EVENT
#include <curses.h>
#undef KEY_EVENT
#define FONT_HEIGHT 16
#define FONT_WIDTH 8
enum maybe_keycode {
CURSES_KEYCODE,
CURSES_CHAR,
CURSES_CHAR_OR_KEYCODE,
};
static DisplayChangeListener *dcl;
static console_ch_t *screen;
static WINDOW *screenpad = NULL;
static int width, height, gwidth, gheight, invalidate;
static int px, py, sminx, sminy, smaxx, smaxy;
static const char *font_charset = "CP437";
static cchar_t *vga_to_curses;
static void curses_update(DisplayChangeListener *dcl,
int x, int y, int w, int h)
{
console_ch_t *line;
g_autofree cchar_t *curses_line = g_new(cchar_t, width);
wchar_t wch[CCHARW_MAX];
attr_t attrs;
short colors;
int ret;
line = screen + y * width;
for (h += y; y < h; y ++, line += width) {
for (x = 0; x < width; x++) {
chtype ch = line[x] & A_CHARTEXT;
chtype at = line[x] & A_ATTRIBUTES;
short color_pair = PAIR_NUMBER(line[x]);
ret = getcchar(&vga_to_curses[ch], wch, &attrs, &colors, NULL);
if (ret == ERR || wch[0] == 0) {
wch[0] = ch;
wch[1] = 0;
}
setcchar(&curses_line[x], wch, at, color_pair, NULL);
}
mvwadd_wchnstr(screenpad, y, 0, curses_line, width);
}
pnoutrefresh(screenpad, py, px, sminy, sminx, smaxy - 1, smaxx - 1);
refresh();
}
static void curses_calc_pad(void)
{
if (qemu_console_is_fixedsize(NULL)) {
width = gwidth;
height = gheight;
} else {
width = COLS;
height = LINES;
}
if (screenpad)
delwin(screenpad);
clear();
refresh();
screenpad = newpad(height, width);
if (width > COLS) {
px = (width - COLS) / 2;
sminx = 0;
smaxx = COLS;
} else {
px = 0;
sminx = (COLS - width) / 2;
smaxx = sminx + width;
}
if (height > LINES) {
py = (height - LINES) / 2;
sminy = 0;
smaxy = LINES;
} else {
py = 0;
sminy = (LINES - height) / 2;
smaxy = sminy + height;
}
}
static void curses_resize(DisplayChangeListener *dcl,
int width, int height)
{
if (width == gwidth && height == gheight) {
return;
}
gwidth = width;
gheight = height;
curses_calc_pad();
}
#if !defined(_WIN32) && defined(SIGWINCH) && defined(KEY_RESIZE)
static volatile sig_atomic_t got_sigwinch;
static void curses_winch_check(void)
{
struct winsize {
unsigned short ws_row;
unsigned short ws_col;
unsigned short ws_xpixel; /* unused */
unsigned short ws_ypixel; /* unused */
} ws;
if (!got_sigwinch) {
return;
}
got_sigwinch = false;
if (ioctl(1, TIOCGWINSZ, &ws) == -1) {
return;
}
resize_term(ws.ws_row, ws.ws_col);
invalidate = 1;
}
static void curses_winch_handler(int signum)
{
got_sigwinch = true;
}
static void curses_winch_init(void)
{
struct sigaction old, winch = {
.sa_handler = curses_winch_handler,
};
sigaction(SIGWINCH, &winch, &old);
}
#else
static void curses_winch_check(void) {}
static void curses_winch_init(void) {}
#endif
static void curses_cursor_position(DisplayChangeListener *dcl,
int x, int y)
{
if (x >= 0) {
x = sminx + x - px;
y = sminy + y - py;
if (x >= 0 && y >= 0 && x < COLS && y < LINES) {
move(y, x);
curs_set(1);
/* it seems that curs_set(1) must always be called before
* curs_set(2) for the latter to have effect */
if (!qemu_console_is_graphic(NULL)) {
curs_set(2);
}
return;
}
}
curs_set(0);
}
/* generic keyboard conversion */
#include "curses_keys.h"
static kbd_layout_t *kbd_layout = NULL;
static wint_t console_getch(enum maybe_keycode *maybe_keycode)
{
wint_t ret;
switch (get_wch(&ret)) {
case KEY_CODE_YES:
*maybe_keycode = CURSES_KEYCODE;
break;
case OK:
*maybe_keycode = CURSES_CHAR;
break;
case ERR:
ret = -1;
break;
default:
abort();
}
return ret;
}
static int curses2foo(const int _curses2foo[], const int _curseskey2foo[],
int chr, enum maybe_keycode maybe_keycode)
{
int ret = -1;
if (maybe_keycode == CURSES_CHAR) {
if (chr < CURSES_CHARS) {
ret = _curses2foo[chr];
}
} else {
if (chr < CURSES_KEYS) {
ret = _curseskey2foo[chr];
}
if (ret == -1 && maybe_keycode == CURSES_CHAR_OR_KEYCODE &&
chr < CURSES_CHARS) {
ret = _curses2foo[chr];
}
}
return ret;
}
#define curses2keycode(chr, maybe_keycode) \
curses2foo(_curses2keycode, _curseskey2keycode, chr, maybe_keycode)
#define curses2keysym(chr, maybe_keycode) \
curses2foo(_curses2keysym, _curseskey2keysym, chr, maybe_keycode)
#define curses2qemu(chr, maybe_keycode) \
curses2foo(_curses2qemu, _curseskey2qemu, chr, maybe_keycode)
static void curses_refresh(DisplayChangeListener *dcl)
{
int chr, keysym, keycode, keycode_alt;
enum maybe_keycode maybe_keycode = CURSES_KEYCODE;
curses_winch_check();
if (invalidate) {
clear();
refresh();
curses_calc_pad();
graphic_hw_invalidate(NULL);
invalidate = 0;
}
graphic_hw_text_update(NULL, screen);
while (1) {
/* while there are any pending key strokes to process */
chr = console_getch(&maybe_keycode);
if (chr == -1)
break;
#ifdef KEY_RESIZE
/* this shouldn't occur when we use a custom SIGWINCH handler */
if (maybe_keycode != CURSES_CHAR && chr == KEY_RESIZE) {
clear();
refresh();
curses_calc_pad();
curses_update(dcl, 0, 0, width, height);
continue;
}
#endif
keycode = curses2keycode(chr, maybe_keycode);
keycode_alt = 0;
/* alt or esc key */
if (keycode == 1) {
enum maybe_keycode next_maybe_keycode = CURSES_KEYCODE;
int nextchr = console_getch(&next_maybe_keycode);
if (nextchr != -1) {
chr = nextchr;
maybe_keycode = next_maybe_keycode;
keycode_alt = ALT;
keycode = curses2keycode(chr, maybe_keycode);
if (keycode != -1) {
keycode |= ALT;
/* process keys reserved for qemu */
if (keycode >= QEMU_KEY_CONSOLE0 &&
keycode < QEMU_KEY_CONSOLE0 + 9) {
erase();
wnoutrefresh(stdscr);
console_select(keycode - QEMU_KEY_CONSOLE0);
invalidate = 1;
continue;
}
}
}
}
if (kbd_layout) {
keysym = curses2keysym(chr, maybe_keycode);
if (keysym == -1) {
if (chr < ' ') {
keysym = chr + '@';
if (keysym >= 'A' && keysym <= 'Z')
keysym += 'a' - 'A';
keysym |= KEYSYM_CNTRL;
} else
keysym = chr;
}
keycode = keysym2scancode(kbd_layout, keysym & KEYSYM_MASK,
NULL, false);
if (keycode == 0)
continue;
keycode |= (keysym & ~KEYSYM_MASK) >> 16;
keycode |= keycode_alt;
}
if (keycode == -1)
continue;
if (qemu_console_is_graphic(NULL)) {
/* since terminals don't know about key press and release
* events, we need to emit both for each key received */
if (keycode & SHIFT) {
qemu_input_event_send_key_number(NULL, SHIFT_CODE, true);
qemu_input_event_send_key_delay(0);
}
if (keycode & CNTRL) {
qemu_input_event_send_key_number(NULL, CNTRL_CODE, true);
qemu_input_event_send_key_delay(0);
}
if (keycode & ALT) {
qemu_input_event_send_key_number(NULL, ALT_CODE, true);
qemu_input_event_send_key_delay(0);
}
if (keycode & ALTGR) {
qemu_input_event_send_key_number(NULL, GREY | ALT_CODE, true);
qemu_input_event_send_key_delay(0);
}
qemu_input_event_send_key_number(NULL, keycode & KEY_MASK, true);
qemu_input_event_send_key_delay(0);
qemu_input_event_send_key_number(NULL, keycode & KEY_MASK, false);
qemu_input_event_send_key_delay(0);
if (keycode & ALTGR) {
qemu_input_event_send_key_number(NULL, GREY | ALT_CODE, false);
qemu_input_event_send_key_delay(0);
}
if (keycode & ALT) {
qemu_input_event_send_key_number(NULL, ALT_CODE, false);
qemu_input_event_send_key_delay(0);
}
if (keycode & CNTRL) {
qemu_input_event_send_key_number(NULL, CNTRL_CODE, false);
qemu_input_event_send_key_delay(0);
}
if (keycode & SHIFT) {
qemu_input_event_send_key_number(NULL, SHIFT_CODE, false);
qemu_input_event_send_key_delay(0);
}
} else {
keysym = curses2qemu(chr, maybe_keycode);
if (keysym == -1)
keysym = chr;
kbd_put_keysym(keysym);
}
}
}
static void curses_atexit(void)
{
endwin();
g_free(vga_to_curses);
g_free(screen);
}
/*
* In the following:
* - fch is the font glyph number
* - uch is the unicode value
* - wch is the wchar_t value (may not be unicode, e.g. on BSD/solaris)
* - mbch is the native local-dependent multibyte representation
*/
/* Setup wchar glyph for one UCS-2 char */
static void convert_ucs(unsigned char fch, uint16_t uch, iconv_t conv)
{
char mbch[MB_LEN_MAX];
wchar_t wch[2];
char *puch, *pmbch;
size_t such, smbch;
mbstate_t ps;
puch = (char *) &uch;
pmbch = (char *) mbch;
such = sizeof(uch);
smbch = sizeof(mbch);
if (iconv(conv, &puch, &such, &pmbch, &smbch) == (size_t) -1) {
fprintf(stderr, "Could not convert 0x%04x "
"from UCS-2 to a multibyte character: %s\n",
uch, strerror(errno));
return;
}
memset(&ps, 0, sizeof(ps));
if (mbrtowc(&wch[0], mbch, sizeof(mbch) - smbch, &ps) == -1) {
fprintf(stderr, "Could not convert 0x%04x "
"from a multibyte character to wchar_t: %s\n",
uch, strerror(errno));
return;
}
wch[1] = 0;
setcchar(&vga_to_curses[fch], wch, 0, 0, NULL);
}
/* Setup wchar glyph for one font character */
static void convert_font(unsigned char fch, iconv_t conv)
{
char mbch[MB_LEN_MAX];
wchar_t wch[2];
char *pfch, *pmbch;
size_t sfch, smbch;
mbstate_t ps;
pfch = (char *) &fch;
pmbch = (char *) &mbch;
sfch = sizeof(fch);
smbch = sizeof(mbch);
if (iconv(conv, &pfch, &sfch, &pmbch, &smbch) == (size_t) -1) {
fprintf(stderr, "Could not convert font glyph 0x%02x "
"from %s to a multibyte character: %s\n",
fch, font_charset, strerror(errno));
return;
}
memset(&ps, 0, sizeof(ps));
if (mbrtowc(&wch[0], mbch, sizeof(mbch) - smbch, &ps) == -1) {
fprintf(stderr, "Could not convert font glyph 0x%02x "
"from a multibyte character to wchar_t: %s\n",
fch, strerror(errno));
return;
}
wch[1] = 0;
setcchar(&vga_to_curses[fch], wch, 0, 0, NULL);
}
/* Convert one wchar to UCS-2 */
static uint16_t get_ucs(wchar_t wch, iconv_t conv)
{
char mbch[MB_LEN_MAX];
uint16_t uch;
char *pmbch, *puch;
size_t smbch, such;
mbstate_t ps;
int ret;
memset(&ps, 0, sizeof(ps));
ret = wcrtomb(mbch, wch, &ps);
if (ret == -1) {
fprintf(stderr, "Could not convert 0x%04lx "
"from wchar_t to a multibyte character: %s\n",
(unsigned long)wch, strerror(errno));
return 0xFFFD;
}
pmbch = (char *) mbch;
puch = (char *) &uch;
smbch = ret;
such = sizeof(uch);
if (iconv(conv, &pmbch, &smbch, &puch, &such) == (size_t) -1) {
fprintf(stderr, "Could not convert 0x%04lx "
"from a multibyte character to UCS-2 : %s\n",
(unsigned long)wch, strerror(errno));
return 0xFFFD;
}
return uch;
}
/*
* Setup mapping for vga to curses line graphics.
*/
static void font_setup(void)
{
iconv_t ucs2_to_nativecharset;
iconv_t nativecharset_to_ucs2;
iconv_t font_conv;
int i;
g_autofree gchar *local_codeset = g_get_codeset();
/*
* Control characters are normally non-printable, but VGA does have
* well-known glyphs for them.
*/
static const uint16_t control_characters[0x20] = {
0x0020,
0x263a,
0x263b,
0x2665,
0x2666,
0x2663,
0x2660,
0x2022,
0x25d8,
0x25cb,
0x25d9,
0x2642,
0x2640,
0x266a,
0x266b,
0x263c,
0x25ba,
0x25c4,
0x2195,
0x203c,
0x00b6,
0x00a7,
0x25ac,
0x21a8,
0x2191,
0x2193,
0x2192,
0x2190,
0x221f,
0x2194,
0x25b2,
0x25bc
};
ucs2_to_nativecharset = iconv_open(local_codeset, "UCS-2");
if (ucs2_to_nativecharset == (iconv_t) -1) {
fprintf(stderr, "Could not convert font glyphs from UCS-2: '%s'\n",
strerror(errno));
exit(1);
}
nativecharset_to_ucs2 = iconv_open("UCS-2", local_codeset);
if (nativecharset_to_ucs2 == (iconv_t) -1) {
iconv_close(ucs2_to_nativecharset);
fprintf(stderr, "Could not convert font glyphs to UCS-2: '%s'\n",
strerror(errno));
exit(1);
}
font_conv = iconv_open(local_codeset, font_charset);
if (font_conv == (iconv_t) -1) {
iconv_close(ucs2_to_nativecharset);
iconv_close(nativecharset_to_ucs2);
fprintf(stderr, "Could not convert font glyphs from %s: '%s'\n",
font_charset, strerror(errno));
exit(1);
}
/* Control characters */
for (i = 0; i <= 0x1F; i++) {
convert_ucs(i, control_characters[i], ucs2_to_nativecharset);
}
for (i = 0x20; i <= 0xFF; i++) {
convert_font(i, font_conv);
}
/* DEL */
convert_ucs(0x7F, 0x2302, ucs2_to_nativecharset);
if (strcmp(local_codeset, "UTF-8")) {
/* Non-Unicode capable, use termcap equivalents for those available */
for (i = 0; i <= 0xFF; i++) {
wchar_t wch[CCHARW_MAX];
attr_t attr;
short color;
int ret;
ret = getcchar(&vga_to_curses[i], wch, &attr, &color, NULL);
if (ret == ERR)
continue;
switch (get_ucs(wch[0], nativecharset_to_ucs2)) {
case 0x00a3:
vga_to_curses[i] = *WACS_STERLING;
break;
case 0x2591:
vga_to_curses[i] = *WACS_BOARD;
break;
case 0x2592:
vga_to_curses[i] = *WACS_CKBOARD;
break;
case 0x2502:
vga_to_curses[i] = *WACS_VLINE;
break;
case 0x2524:
vga_to_curses[i] = *WACS_RTEE;
break;
case 0x2510:
vga_to_curses[i] = *WACS_URCORNER;
break;
case 0x2514:
vga_to_curses[i] = *WACS_LLCORNER;
break;
case 0x2534:
vga_to_curses[i] = *WACS_BTEE;
break;
case 0x252c:
vga_to_curses[i] = *WACS_TTEE;
break;
case 0x251c:
vga_to_curses[i] = *WACS_LTEE;
break;
case 0x2500:
vga_to_curses[i] = *WACS_HLINE;
break;
case 0x253c:
vga_to_curses[i] = *WACS_PLUS;
break;
case 0x256c:
vga_to_curses[i] = *WACS_LANTERN;
break;
case 0x256a:
vga_to_curses[i] = *WACS_NEQUAL;
break;
case 0x2518:
vga_to_curses[i] = *WACS_LRCORNER;
break;
case 0x250c:
vga_to_curses[i] = *WACS_ULCORNER;
break;
case 0x2588:
vga_to_curses[i] = *WACS_BLOCK;
break;
case 0x03c0:
vga_to_curses[i] = *WACS_PI;
break;
case 0x00b1:
vga_to_curses[i] = *WACS_PLMINUS;
break;
case 0x2265:
vga_to_curses[i] = *WACS_GEQUAL;
break;
case 0x2264:
vga_to_curses[i] = *WACS_LEQUAL;
break;
case 0x00b0:
vga_to_curses[i] = *WACS_DEGREE;
break;
case 0x25a0:
vga_to_curses[i] = *WACS_BULLET;
break;
case 0x2666:
vga_to_curses[i] = *WACS_DIAMOND;
break;
case 0x2192:
vga_to_curses[i] = *WACS_RARROW;
break;
case 0x2190:
vga_to_curses[i] = *WACS_LARROW;
break;
case 0x2191:
vga_to_curses[i] = *WACS_UARROW;
break;
case 0x2193:
vga_to_curses[i] = *WACS_DARROW;
break;
case 0x23ba:
vga_to_curses[i] = *WACS_S1;
break;
case 0x23bb:
vga_to_curses[i] = *WACS_S3;
break;
case 0x23bc:
vga_to_curses[i] = *WACS_S7;
break;
case 0x23bd:
vga_to_curses[i] = *WACS_S9;
break;
}
}
}
iconv_close(ucs2_to_nativecharset);
iconv_close(nativecharset_to_ucs2);
iconv_close(font_conv);
}
static void curses_setup(void)
{
int i, colour_default[8] = {
[QEMU_COLOR_BLACK] = COLOR_BLACK,
[QEMU_COLOR_BLUE] = COLOR_BLUE,
[QEMU_COLOR_GREEN] = COLOR_GREEN,
[QEMU_COLOR_CYAN] = COLOR_CYAN,
[QEMU_COLOR_RED] = COLOR_RED,
[QEMU_COLOR_MAGENTA] = COLOR_MAGENTA,
[QEMU_COLOR_YELLOW] = COLOR_YELLOW,
[QEMU_COLOR_WHITE] = COLOR_WHITE,
};
/* input as raw as possible, let everything be interpreted
* by the guest system */
initscr(); noecho(); intrflush(stdscr, FALSE);
nodelay(stdscr, TRUE); nonl(); keypad(stdscr, TRUE);
start_color(); raw(); scrollok(stdscr, FALSE);
set_escdelay(25);
/* Make color pair to match color format (3bits bg:3bits fg) */
for (i = 0; i < 64; i++) {
init_pair(i, colour_default[i & 7], colour_default[i >> 3]);
}
/* Set default color for more than 64 for safety. */
for (i = 64; i < COLOR_PAIRS; i++) {
init_pair(i, COLOR_WHITE, COLOR_BLACK);
}
font_setup();
}
static void curses_keyboard_setup(void)
{
#if defined(__APPLE__)
/* always use generic keymaps */
if (!keyboard_layout)
keyboard_layout = "en-us";
#endif
if(keyboard_layout) {
kbd_layout = init_keyboard_layout(name2keysym, keyboard_layout,
&error_fatal);
}
}
static const DisplayChangeListenerOps dcl_ops = {
.dpy_name = "curses",
.dpy_text_update = curses_update,
.dpy_text_resize = curses_resize,
.dpy_refresh = curses_refresh,
.dpy_text_cursor = curses_cursor_position,
};
static void curses_display_init(DisplayState *ds, DisplayOptions *opts)
{
#ifndef _WIN32
if (!isatty(1)) {
fprintf(stderr, "We need a terminal output\n");
exit(1);
}
#endif
setlocale(LC_CTYPE, "");
if (opts->u.curses.charset) {
font_charset = opts->u.curses.charset;
}
screen = g_new0(console_ch_t, 160 * 100);
vga_to_curses = g_new0(cchar_t, 256);
curses_setup();
curses_keyboard_setup();
atexit(curses_atexit);
curses_winch_init();
dcl = g_new0(DisplayChangeListener, 1);
dcl->ops = &dcl_ops;
register_displaychangelistener(dcl);
invalidate = 1;
}
static QemuDisplay qemu_display_curses = {
.type = DISPLAY_TYPE_CURSES,
.init = curses_display_init,
};
static void register_curses(void)
{
qemu_display_register(&qemu_display_curses);
}
type_init(register_curses);
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