| /* 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 "busybox.h" |
| |
| #define ESC "\033" |
| |
| struct termios old; |
| |
| static void |
| onintr(int sig ATTRIBUTE_UNUSED) |
| { |
| tcsetattr(STDERR_FILENO, TCSANOW, &old); |
| 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); /* fiddle echo */ |
| new = old; |
| 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); |
| |
| if (ENABLE_FEATURE_RESIZE_PRINT) |
| printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n", |
| w.ws_col, w.ws_row); |
| |
| return ret; |
| } |