116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* resize - set terminal width and height.
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*
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* Copyright 2006 Bernhard Reutner-Fischer
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config RESIZE
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//config: bool "resize (903 bytes)"
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//config: default y
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//config: help
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//config: This program is used to (re)set the width and height of your current
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//config: terminal.
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//config:
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//config:config FEATURE_RESIZE_PRINT
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//config: bool "Print environment variables"
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//config: default y
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//config: depends on RESIZE
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//config: help
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//config: Prints the newly set size (number of columns and rows) of
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//config: the terminal.
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//config: E.g.:
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//config: COLUMNS=80;LINES=44;export COLUMNS LINES;
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//applet:IF_RESIZE(APPLET_NOEXEC(resize, resize, BB_DIR_USR_BIN, BB_SUID_DROP, resize))
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/* bb_common_bufsiz1 usage here is safe wrt NOEXEC: not expecting it to be zeroed. */
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//kbuild:lib-$(CONFIG_RESIZE) += resize.o
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//usage:#define resize_trivial_usage
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//usage: ""
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//usage:#define resize_full_usage "\n\n"
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//usage: "Resize the screen"
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#include "libbb.h"
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#include "common_bufsiz.h"
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#define ESC "\033"
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#define old_termios_p ((struct termios*)bb_common_bufsiz1)
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#define INIT_G() do { setup_common_bufsiz(); } while (0)
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static void
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onintr(int sig UNUSED_PARAM)
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{
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tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
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_exit(EXIT_FAILURE);
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}
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int resize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int resize_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
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{
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struct termios new;
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struct winsize w = { 0, 0, 0, 0 };
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int ret;
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INIT_G();
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/* We use _stderr_ in order to make resize usable
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* in shell backticks (those redirect stdout away from tty).
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* NB: other versions of resize open "/dev/tty"
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* and operate on it - should we do the same?
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*/
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tcgetattr(STDERR_FILENO, old_termios_p); /* fiddle echo */
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//TODO: die if the above fails?
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memcpy(&new, old_termios_p, sizeof(new));
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new.c_cflag |= (CLOCAL | CREAD);
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new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
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bb_signals(0
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+ (1 << SIGINT)
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+ (1 << SIGQUIT)
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+ (1 << SIGTERM)
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+ (1 << SIGALRM)
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, onintr);
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/* Users report:
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* The resize command messes up the terminal.
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* In my case it looks like it is hanging and
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* I need to press ctrl-c to get a prompt.
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* Actually the program does not hang but just
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* the terminal is messed up.
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* Replaced TCSANOW with TCSAFLUSH:
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* "the change occurs after all output written to fd
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* has been transmitted, and all input that has been
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* received but not read will be discarded before
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* the change is made.
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*/
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tcsetattr(STDERR_FILENO, TCSAFLUSH, &new);
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/* save_cursor_pos 7
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* scroll_whole_screen [r
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* put_cursor_waaaay_off [$x;$yH
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* get_cursor_pos [6n
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* restore_cursor_pos 8
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*/
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fprintf(stderr, ESC"7" ESC"[r" ESC"[999;999H" ESC"[6n");
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alarm(3); /* Just in case terminal won't answer */
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//BUG: death by signal won't restore termios
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scanf(ESC"[%hu;%huR", &w.ws_row, &w.ws_col);
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fprintf(stderr, ESC"8");
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/* BTW, other versions of resize recalculate w.ws_xpixel, ws.ws_ypixel
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* by calculating character cell HxW from old values
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* (gotten via TIOCGWINSZ) and recomputing *pixel values */
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ret = ioctl(STDERR_FILENO, TIOCSWINSZ, &w);
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tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
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if (ENABLE_FEATURE_RESIZE_PRINT)
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printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",
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w.ws_col, w.ws_row);
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return ret;
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}
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