conspy: code shrink
function old new delta screen_read_close 114 187 +73 set_cursor - 53 +53 cleanup 93 91 -2 screen_dump 202 197 -5 curon 34 - -34 screen_char 351 308 -43 conspy_main 1444 1264 -180 ------------------------------------------------------------------------------ (add/remove: 1/1 grow/shrink: 1/4 up/down: 126/-264) Total: -138 bytes Signed-off-by: Pascal Bellard <pascal.bellard@ads-lu.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Pascal Bellard
Denys Vlasenko
parent
c03fb3cd7d
commit
fa5ea17b5f
@ -46,9 +46,9 @@ struct screen_info {
|
||||
unsigned char lines, cols, cursor_x, cursor_y;
|
||||
};
|
||||
|
||||
#define CHAR(x) ((uint8_t)((x)[0]))
|
||||
#define ATTR(x) ((uint8_t)((x)[1]))
|
||||
#define NEXT(x) ((x)+=2)
|
||||
#define CHAR(x) (*(uint8_t*)(x))
|
||||
#define ATTR(x) (((uint8_t*)(x))[1])
|
||||
#define NEXT(x) ((x) += 2)
|
||||
#define DATA(x) (*(uint16_t*)(x))
|
||||
|
||||
struct globals {
|
||||
@ -56,25 +56,25 @@ struct globals {
|
||||
int size;
|
||||
int x, y;
|
||||
int kbd_fd;
|
||||
int vcsa_fd;
|
||||
int ioerror_count;
|
||||
int key_count;
|
||||
int escape_count;
|
||||
int nokeys;
|
||||
int current;
|
||||
int first_line_offset;
|
||||
int last_attr;
|
||||
// cached local tty parameters
|
||||
unsigned width;
|
||||
unsigned height;
|
||||
unsigned col;
|
||||
unsigned line;
|
||||
smallint curoff;
|
||||
uint8_t last_attr;
|
||||
uint8_t force_attr_change;
|
||||
smallint curoff; // unknown:0 cursor on:-1 cursor off:1
|
||||
char attrbuf[sizeof("\033[0;1;5;30;40m")];
|
||||
// remote console
|
||||
struct screen_info remote;
|
||||
// saved local tty terminfo
|
||||
struct termios term_orig;
|
||||
char vcsa_name[sizeof("/dev/vcsaNN")];
|
||||
};
|
||||
|
||||
#define G (*ptr_to_globals)
|
||||
@ -82,7 +82,8 @@ struct globals {
|
||||
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
|
||||
G.attrbuf[0] = '\033'; \
|
||||
G.attrbuf[1] = '['; \
|
||||
G.force_attr_change = 0xff; \
|
||||
G.width = G.height = UINT_MAX; \
|
||||
G.last_attr--; \
|
||||
} while (0)
|
||||
|
||||
enum {
|
||||
@ -96,24 +97,80 @@ enum {
|
||||
#define FLAG(x) (1 << FLAG_##x)
|
||||
#define BW (option_mask32 & FLAG(n))
|
||||
|
||||
static void clrscr(void)
|
||||
{
|
||||
// Home, clear till end of screen
|
||||
fputs("\033[1;1H" "\033[J", stdout);
|
||||
G.col = G.line = 0;
|
||||
}
|
||||
|
||||
static void set_cursor(int state)
|
||||
{
|
||||
if (G.curoff != state) {
|
||||
G.curoff = state;
|
||||
fputs("\033[?25", stdout);
|
||||
bb_putchar("h?l"[1 + state]);
|
||||
}
|
||||
}
|
||||
|
||||
static void gotoxy(int col, int line)
|
||||
{
|
||||
if (G.col != col || G.line != line) {
|
||||
G.col = col;
|
||||
G.line = line;
|
||||
printf("\033[%u;%uH", line + 1, col + 1);
|
||||
}
|
||||
}
|
||||
|
||||
static void cleanup(int code)
|
||||
{
|
||||
set_cursor(-1); // cursor on
|
||||
tcsetattr(G.kbd_fd, TCSANOW, &G.term_orig);
|
||||
if (ENABLE_FEATURE_CLEAN_UP) {
|
||||
close(G.kbd_fd);
|
||||
}
|
||||
// Reset attributes
|
||||
if (!BW)
|
||||
fputs("\033[0m", stdout);
|
||||
bb_putchar('\n');
|
||||
if (code > 1)
|
||||
kill_myself_with_sig(code);
|
||||
exit(code);
|
||||
}
|
||||
|
||||
static void screen_read_close(void)
|
||||
{
|
||||
unsigned i, j;
|
||||
char *data = G.data + G.current;
|
||||
int vcsa_fd;
|
||||
char *data;
|
||||
|
||||
xread(G.vcsa_fd, data, G.size);
|
||||
// Close & re-open vcsa in case they have swapped virtual consoles
|
||||
vcsa_fd = xopen(G.vcsa_name, O_RDONLY);
|
||||
xread(vcsa_fd, &G.remote, 4);
|
||||
i = G.remote.cols * 2;
|
||||
G.first_line_offset = G.y * i;
|
||||
i *= G.remote.lines;
|
||||
if (G.data == NULL) {
|
||||
G.size = i;
|
||||
G.data = xzalloc(2 * i);
|
||||
}
|
||||
else if (G.size != i) {
|
||||
cleanup(1);
|
||||
}
|
||||
data = G.data + G.current;
|
||||
xread(vcsa_fd, data, G.size);
|
||||
close(vcsa_fd);
|
||||
for (i = 0; i < G.remote.lines; i++) {
|
||||
for (j = 0; j < G.remote.cols; j++, NEXT(data)) {
|
||||
unsigned x = j - G.x; // if will catch j < G.x too
|
||||
unsigned y = i - G.y; // if will catch i < G.y too
|
||||
|
||||
if (CHAR(data) < ' ')
|
||||
*data = ' '; // CHAR(data) = ' ';
|
||||
CHAR(data) = ' ';
|
||||
if (y >= G.height || x >= G.width)
|
||||
DATA(data) = 0;
|
||||
}
|
||||
}
|
||||
close(G.vcsa_fd);
|
||||
}
|
||||
|
||||
static void screen_char(char *data)
|
||||
@ -121,7 +178,7 @@ static void screen_char(char *data)
|
||||
if (!BW) {
|
||||
uint8_t attr = ATTR(data);
|
||||
//uint8_t attr = ATTR(data) >> 1; // for framebuffer console
|
||||
uint8_t attr_diff = (G.last_attr ^ attr) | G.force_attr_change;
|
||||
uint8_t attr_diff = G.last_attr ^ attr;
|
||||
|
||||
if (attr_diff) {
|
||||
// Attribute layout for VGA compatible text videobuffer:
|
||||
@ -153,19 +210,20 @@ static void screen_char(char *data)
|
||||
const uint8_t bg_mask = 0x70, blink_mask = 0x80;
|
||||
char *ptr;
|
||||
|
||||
ptr = G.attrbuf + 2; /* skip "ESC [" */
|
||||
ptr = G.attrbuf + 2; // skip "ESC ["
|
||||
|
||||
// (G.last_attr & ~attr) has 1 only where
|
||||
// G.last_attr has 1 but attr has 0.
|
||||
// Here we check whether we have transition
|
||||
// bold->non-bold or blink->non-blink:
|
||||
if ((G.last_attr & ~attr) & (bold_mask | blink_mask)) {
|
||||
if (G.last_attr < 0 // initial value
|
||||
|| ((G.last_attr & ~attr) & (bold_mask | blink_mask)) != 0
|
||||
) {
|
||||
*ptr++ = '0'; // "reset all attrs"
|
||||
*ptr++ = ';';
|
||||
// must set fg & bg, maybe need to set bold or blink:
|
||||
attr_diff = attr | ~(bold_mask | blink_mask);
|
||||
}
|
||||
G.force_attr_change = 0;
|
||||
G.last_attr = attr;
|
||||
if (attr_diff & bold_mask) {
|
||||
*ptr++ = '1';
|
||||
@ -196,44 +254,12 @@ static void screen_char(char *data)
|
||||
G.col++;
|
||||
}
|
||||
|
||||
static void clrscr(void)
|
||||
{
|
||||
// Home, clear till end of src, cursor on
|
||||
fputs("\033[1;1H" "\033[J" "\033[?25h", stdout);
|
||||
G.curoff = G.col = G.line = 0;
|
||||
}
|
||||
|
||||
static void curoff(void)
|
||||
{
|
||||
if (!G.curoff) {
|
||||
G.curoff = 1;
|
||||
fputs("\033[?25l", stdout);
|
||||
}
|
||||
}
|
||||
|
||||
static void curon(void)
|
||||
{
|
||||
if (G.curoff) {
|
||||
G.curoff = 0;
|
||||
fputs("\033[?25h", stdout);
|
||||
}
|
||||
}
|
||||
|
||||
static void gotoxy(int col, int line)
|
||||
{
|
||||
if (G.col != col || G.line != line) {
|
||||
G.col = col;
|
||||
G.line = line;
|
||||
printf("\033[%u;%uH", line + 1, col + 1);
|
||||
}
|
||||
}
|
||||
|
||||
static void screen_dump(void)
|
||||
{
|
||||
int linefeed_cnt;
|
||||
int line, col;
|
||||
int linecnt = G.remote.lines - G.y;
|
||||
char *data = G.data + G.current + (2 * G.y * G.remote.cols);
|
||||
char *data = G.data + G.current + G.first_line_offset;
|
||||
|
||||
linefeed_cnt = 0;
|
||||
for (line = 0; line < linecnt && line < G.height; line++) {
|
||||
@ -263,41 +289,13 @@ static void curmove(void)
|
||||
{
|
||||
unsigned cx = G.remote.cursor_x - G.x;
|
||||
unsigned cy = G.remote.cursor_y - G.y;
|
||||
int cursor = 1;
|
||||
|
||||
if (cx >= G.width || cy >= G.height) {
|
||||
curoff();
|
||||
} else {
|
||||
curon();
|
||||
if (cx < G.width && cy < G.height) {
|
||||
gotoxy(cx, cy);
|
||||
cursor = -1;
|
||||
}
|
||||
fflush_all();
|
||||
}
|
||||
|
||||
static void cleanup(int code)
|
||||
{
|
||||
curon();
|
||||
fflush_all();
|
||||
tcsetattr(G.kbd_fd, TCSANOW, &G.term_orig);
|
||||
if (ENABLE_FEATURE_CLEAN_UP) {
|
||||
close(G.kbd_fd);
|
||||
}
|
||||
// Reset attributes
|
||||
if (!BW)
|
||||
fputs("\033[0m", stdout);
|
||||
bb_putchar('\n');
|
||||
if (code > 1)
|
||||
kill_myself_with_sig(code); // does not return
|
||||
exit(code);
|
||||
}
|
||||
|
||||
static void get_initial_data(const char* vcsa_name)
|
||||
{
|
||||
G.vcsa_fd = xopen(vcsa_name, O_RDONLY);
|
||||
xread(G.vcsa_fd, &G.remote, 4);
|
||||
G.size = G.remote.cols * G.remote.lines * 2;
|
||||
G.width = G.height = UINT_MAX;
|
||||
G.data = xzalloc(2 * G.size);
|
||||
screen_read_close();
|
||||
set_cursor(cursor);
|
||||
}
|
||||
|
||||
static void create_cdev_if_doesnt_exist(const char* name, dev_t dev)
|
||||
@ -345,7 +343,6 @@ static NOINLINE void start_shell_in_child(const char* tty_name)
|
||||
int conspy_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
||||
int conspy_main(int argc UNUSED_PARAM, char **argv)
|
||||
{
|
||||
char vcsa_name[sizeof("/dev/vcsaNN")];
|
||||
char tty_name[sizeof("/dev/ttyNN")];
|
||||
#define keybuf bb_common_bufsiz1
|
||||
struct termios termbuf;
|
||||
@ -365,7 +362,7 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
|
||||
applet_long_options = getopt_longopts;
|
||||
#endif
|
||||
INIT_G();
|
||||
strcpy(vcsa_name, "/dev/vcsa");
|
||||
strcpy(G.vcsa_name, "/dev/vcsa");
|
||||
|
||||
opt_complementary = "x+:y+"; // numeric params
|
||||
opts = getopt32(argv, "vcsndfx:y:", &G.x, &G.y);
|
||||
@ -373,19 +370,19 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
|
||||
ttynum = 0;
|
||||
if (argv[0]) {
|
||||
ttynum = xatou_range(argv[0], 0, 63);
|
||||
sprintf(vcsa_name + sizeof("/dev/vcsa")-1, "%u", ttynum);
|
||||
sprintf(G.vcsa_name + sizeof("/dev/vcsa")-1, "%u", ttynum);
|
||||
}
|
||||
sprintf(tty_name, "%s%u", "/dev/tty", ttynum);
|
||||
if (opts & FLAG(c)) {
|
||||
if ((opts & (FLAG(s)|FLAG(v))) != FLAG(v))
|
||||
create_cdev_if_doesnt_exist(tty_name, makedev(4, ttynum));
|
||||
create_cdev_if_doesnt_exist(vcsa_name, makedev(7, 128 + ttynum));
|
||||
create_cdev_if_doesnt_exist(G.vcsa_name, makedev(7, 128 + ttynum));
|
||||
}
|
||||
if ((opts & FLAG(s)) && ttynum) {
|
||||
start_shell_in_child(tty_name);
|
||||
}
|
||||
|
||||
get_initial_data(vcsa_name);
|
||||
screen_read_close();
|
||||
if (opts & FLAG(d)) {
|
||||
screen_dump();
|
||||
bb_putchar('\n');
|
||||
@ -412,17 +409,11 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
|
||||
int i, j;
|
||||
char *data, *old;
|
||||
|
||||
// Close & re-open vcsa in case they have
|
||||
// swapped virtual consoles
|
||||
G.vcsa_fd = xopen(vcsa_name, O_RDONLY);
|
||||
xread(G.vcsa_fd, &G.remote, 4);
|
||||
if (G.size != (G.remote.cols * G.remote.lines * 2)) {
|
||||
cleanup(1);
|
||||
}
|
||||
// in the first loop G.width = G.height = 0: refresh
|
||||
i = G.width;
|
||||
j = G.height;
|
||||
get_terminal_width_height(G.kbd_fd, &G.width, &G.height);
|
||||
if ((option_mask32 & FLAG(f))) {
|
||||
if (option_mask32 & FLAG(f)) {
|
||||
int nx = G.remote.cursor_x - G.width + 1;
|
||||
int ny = G.remote.cursor_y - G.height + 1;
|
||||
|
||||
@ -454,8 +445,8 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
|
||||
screen_dump();
|
||||
} else {
|
||||
// For each remote line
|
||||
old += G.y * G.remote.cols * 2;
|
||||
data += G.y * G.remote.cols * 2;
|
||||
old += G.first_line_offset;
|
||||
data += G.first_line_offset;
|
||||
for (i = G.y; i < G.remote.lines; i++) {
|
||||
char *first = NULL; // first char which needs updating
|
||||
char *last = last; // last char which needs updating
|
||||
@ -463,10 +454,8 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
|
||||
|
||||
if (iy >= G.height)
|
||||
break;
|
||||
old += G.x * 2;
|
||||
data += G.x * 2;
|
||||
for (j = G.x; j < G.remote.cols; j++, NEXT(old), NEXT(data)) {
|
||||
unsigned jx = j - G.x;
|
||||
for (j = 0; j < G.remote.cols; j++, NEXT(old), NEXT(data)) {
|
||||
unsigned jx = j - G.x; // if will catch j >= G.x too
|
||||
|
||||
if (jx < G.width && DATA(data) != DATA(old)) {
|
||||
last = data;
|
||||
@ -486,6 +475,7 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
|
||||
curmove();
|
||||
|
||||
// Wait for local user keypresses
|
||||
fflush_all();
|
||||
pfd.fd = G.kbd_fd;
|
||||
pfd.events = POLLIN;
|
||||
bytes_read = 0;
|
||||
@ -532,15 +522,16 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
|
||||
else if (kbd_mode != K_XLATE && kbd_mode != K_UNICODE)
|
||||
G.key_count = 0; // scan code mode
|
||||
else {
|
||||
for (i = 0; i < G.key_count && result != -1; i++)
|
||||
result = ioctl(handle, TIOCSTI, keybuf + i);
|
||||
G.key_count -= i;
|
||||
char *p = keybuf;
|
||||
for (; G.key_count != 0 && result != -1; p++, G.key_count--) {
|
||||
result = ioctl(handle, TIOCSTI, p);
|
||||
// If there is an application on console which reacts
|
||||
// to keypresses, we need to make our first sleep
|
||||
// shorter to quickly redraw whatever it printed there.
|
||||
poll_timeout_ms = 20;
|
||||
}
|
||||
if (G.key_count)
|
||||
memmove(keybuf, keybuf + i, G.key_count);
|
||||
// If there is an application on console which reacts
|
||||
// to keypresses, we need to make our first sleep
|
||||
// shorter to quickly redraw whatever it printed there.
|
||||
poll_timeout_ms = 20;
|
||||
memmove(keybuf, p, G.key_count);
|
||||
}
|
||||
// Close & re-open tty in case they have
|
||||
// swapped virtual consoles
|
||||
@ -553,5 +544,5 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
|
||||
else if (errno != EIO || ++G.ioerror_count > 4)
|
||||
cleanup(1);
|
||||
}
|
||||
}
|
||||
} /* while (1) */
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user