diff options
Diffstat (limited to 'console-tools/resize.c')
-rw-r--r-- | console-tools/resize.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/console-tools/resize.c b/console-tools/resize.c new file mode 100644 index 0000000..4504cc8 --- /dev/null +++ b/console-tools/resize.c @@ -0,0 +1,71 @@ +/* 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 tarball for details. + */ +/* no options, no getopt */ +#include "libbb.h" + +#define ESC "\033" + +#define old_termios (*(struct termios*)&bb_common_bufsiz1) + +static void +onintr(int sig UNUSED_PARAM) +{ + tcsetattr(STDERR_FILENO, TCSANOW, &old_termios); + 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; + + /* 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); /* fiddle echo */ + new = old_termios; + 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 */ + 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); + + if (ENABLE_FEATURE_RESIZE_PRINT) + printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n", + w.ws_col, w.ws_row); + + return ret; +} |