1 /* vi: set sw=4 ts=4: */
3 * resize - set terminal width and height.
5 * Copyright 2006 Bernhard Reutner-Fischer
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 //config: bool "resize (756 bytes)"
13 //config: This program is used to (re)set the width and height of your current
16 //config:config FEATURE_RESIZE_PRINT
17 //config: bool "Print environment variables"
19 //config: depends on RESIZE
21 //config: Prints the newly set size (number of columns and rows) of
22 //config: the terminal.
24 //config: COLUMNS=80;LINES=44;export COLUMNS LINES;
26 //applet:IF_RESIZE(APPLET(resize, BB_DIR_USR_BIN, BB_SUID_DROP))
28 //kbuild:lib-$(CONFIG_RESIZE) += resize.o
30 //usage:#define resize_trivial_usage
32 //usage:#define resize_full_usage "\n\n"
33 //usage: "Resize the screen"
36 #include "common_bufsiz.h"
40 #define old_termios_p ((struct termios*)bb_common_bufsiz1)
41 #define INIT_G() do { setup_common_bufsiz(); } while (0)
44 onintr(int sig UNUSED_PARAM)
46 tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
50 int resize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
51 int resize_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
54 struct winsize w = { 0, 0, 0, 0 };
59 /* We use _stderr_ in order to make resize usable
60 * in shell backticks (those redirect stdout away from tty).
61 * NB: other versions of resize open "/dev/tty"
62 * and operate on it - should we do the same?
65 tcgetattr(STDERR_FILENO, old_termios_p); /* fiddle echo */
66 memcpy(&new, old_termios_p, sizeof(new));
67 new.c_cflag |= (CLOCAL | CREAD);
68 new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
75 tcsetattr(STDERR_FILENO, TCSANOW, &new);
78 * scroll_whole_screen [r
79 * put_cursor_waaaay_off [$x;$yH
81 * restore_cursor_pos 8
83 fprintf(stderr, ESC"7" ESC"[r" ESC"[999;999H" ESC"[6n");
84 alarm(3); /* Just in case terminal won't answer */
85 //BUG: death by signal won't restore termios
86 scanf(ESC"[%hu;%huR", &w.ws_row, &w.ws_col);
87 fprintf(stderr, ESC"8");
89 /* BTW, other versions of resize recalculate w.ws_xpixel, ws.ws_ypixel
90 * by calculating character cell HxW from old values
91 * (gotten via TIOCGWINSZ) and recomputing *pixel values */
92 ret = ioctl(STDERR_FILENO, TIOCSWINSZ, &w);
94 tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
96 if (ENABLE_FEATURE_RESIZE_PRINT)
97 printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",