102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* resize - set terminal width and height.
|
|
*
|
|
* Copyright 2006 Bernhard Reutner-Fischer
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
//config:config RESIZE
|
|
//config: bool "resize (756 bytes)"
|
|
//config: default y
|
|
//config: help
|
|
//config: This program is used to (re)set the width and height of your current
|
|
//config: terminal.
|
|
//config:
|
|
//config:config FEATURE_RESIZE_PRINT
|
|
//config: bool "Print environment variables"
|
|
//config: default y
|
|
//config: depends on RESIZE
|
|
//config: help
|
|
//config: Prints the newly set size (number of columns and rows) of
|
|
//config: the terminal.
|
|
//config: E.g.:
|
|
//config: COLUMNS=80;LINES=44;export COLUMNS LINES;
|
|
|
|
//applet:IF_RESIZE(APPLET(resize, BB_DIR_USR_BIN, BB_SUID_DROP))
|
|
|
|
//kbuild:lib-$(CONFIG_RESIZE) += resize.o
|
|
|
|
//usage:#define resize_trivial_usage
|
|
//usage: ""
|
|
//usage:#define resize_full_usage "\n\n"
|
|
//usage: "Resize the screen"
|
|
|
|
#include "libbb.h"
|
|
#include "common_bufsiz.h"
|
|
|
|
#define ESC "\033"
|
|
|
|
#define old_termios_p ((struct termios*)bb_common_bufsiz1)
|
|
#define INIT_G() do { setup_common_bufsiz(); } while (0)
|
|
|
|
static void
|
|
onintr(int sig UNUSED_PARAM)
|
|
{
|
|
tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
int resize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int resize_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
|
{
|
|
struct termios new;
|
|
struct winsize w = { 0, 0, 0, 0 };
|
|
int ret;
|
|
|
|
INIT_G();
|
|
|
|
/* We use _stderr_ in order to make resize usable
|
|
* in shell backticks (those redirect stdout away from tty).
|
|
* NB: other versions of resize open "/dev/tty"
|
|
* and operate on it - should we do the same?
|
|
*/
|
|
|
|
tcgetattr(STDERR_FILENO, old_termios_p); /* fiddle echo */
|
|
memcpy(&new, old_termios_p, sizeof(new));
|
|
new.c_cflag |= (CLOCAL | CREAD);
|
|
new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
|
|
bb_signals(0
|
|
+ (1 << SIGINT)
|
|
+ (1 << SIGQUIT)
|
|
+ (1 << SIGTERM)
|
|
+ (1 << SIGALRM)
|
|
, onintr);
|
|
tcsetattr(STDERR_FILENO, TCSANOW, &new);
|
|
|
|
/* save_cursor_pos 7
|
|
* scroll_whole_screen [r
|
|
* put_cursor_waaaay_off [$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 */
|
|
//BUG: death by signal won't restore termios
|
|
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_p);
|
|
|
|
if (ENABLE_FEATURE_RESIZE_PRINT)
|
|
printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",
|
|
w.ws_col, w.ws_row);
|
|
|
|
return ret;
|
|
}
|