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71 lines
1.7 KiB
C
71 lines
1.7 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 Fischer
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* no options, no getopt */
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#include "busybox.h"
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#define ESC "\033"
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struct termios old;
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static void
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onintr(int sig ATTRIBUTE_UNUSED)
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{
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tcsetattr(STDERR_FILENO, TCSANOW, &old);
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exit(1);
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}
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int resize_main(int argc, char **argv);
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int resize_main(int argc, char **argv)
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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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/* 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); /* fiddle echo */
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new = old;
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new.c_cflag |= (CLOCAL | CREAD);
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new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
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signal(SIGINT, onintr);
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signal(SIGQUIT, onintr);
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signal(SIGTERM, onintr);
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signal(SIGALRM, onintr);
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tcsetattr(STDERR_FILENO, TCSANOW, &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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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);
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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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