| /* 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" |
| //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; |
| } |