mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-04 01:43:11 +00:00
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* resize - set terminal width and height.
|
|
*
|
|
* Copyright 2006 Bernhard Fischer
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|
*/
|
|
/* no options, no getopt */
|
|
#include "libbb.h"
|
|
|
|
#define ESC "\033"
|
|
|
|
#define old_termios (*(struct termios*)&bb_common_bufsiz1)
|
|
|
|
static void
|
|
onintr(int sig ATTRIBUTE_UNUSED)
|
|
{
|
|
tcsetattr(STDERR_FILENO, TCSANOW, &old_termios);
|
|
exit(1);
|
|
}
|
|
|
|
int resize_main(int argc, char **argv);
|
|
int resize_main(int argc, char **argv)
|
|
{
|
|
struct termios new;
|
|
struct winsize w = { 0,0,0,0 };
|
|
int ret;
|
|
|
|
/* We use _stderr_ in order to make resize usable
|
|
* in shell backticks (those redirect stdout away from tty).
|
|
* NB: other versions of resize open "/dev/tty"
|
|
* and operate on it - should we do the same?
|
|
*/
|
|
|
|
tcgetattr(STDERR_FILENO, &old_termios); /* fiddle echo */
|
|
new = old_termios;
|
|
new.c_cflag |= (CLOCAL | CREAD);
|
|
new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
|
|
signal(SIGINT, onintr);
|
|
signal(SIGQUIT, onintr);
|
|
signal(SIGTERM, onintr);
|
|
signal(SIGALRM, onintr);
|
|
tcsetattr(STDERR_FILENO, TCSANOW, &new);
|
|
|
|
/* save_cursor_pos 7
|
|
* scroll_whole_screen [r
|
|
* put_cursor_waaaay_off [$x;$yH
|
|
* get_cursor_pos [6n
|
|
* restore_cursor_pos 8
|
|
*/
|
|
fprintf(stderr, ESC"7" ESC"[r" ESC"[999;999H" ESC"[6n");
|
|
alarm(3); /* Just in case terminal won't answer */
|
|
scanf(ESC"[%hu;%huR", &w.ws_row, &w.ws_col);
|
|
fprintf(stderr, ESC"8");
|
|
|
|
/* BTW, other versions of resize recalculate w.ws_xpixel, ws.ws_ypixel
|
|
* by calculating character cell HxW from old values
|
|
* (gotten via TIOCGWINSZ) and recomputing *pixel values */
|
|
ret = ioctl(STDERR_FILENO, TIOCSWINSZ, &w);
|
|
|
|
tcsetattr(STDERR_FILENO, TCSANOW, &old_termios);
|
|
|
|
if (ENABLE_FEATURE_RESIZE_PRINT)
|
|
printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",
|
|
w.ws_col, w.ws_row);
|
|
|
|
return ret;
|
|
}
|