hush/console-tools/resize.c
Denis Vlasenko 68404f13d4 *: add -Wunused-parameter; fix resulting breakage
function                                             old     new   delta
procps_scan                                         1265    1298     +33
aliascmd                                             278     283      +5
parse_file_cmd                                       116     120      +4
dname_enc                                            373     377      +4
setcmd                                                90      93      +3
execcmd                                               57      60      +3
count_lines                                           72      74      +2
process_command_subs                                 340     339      -1
test_main                                            409     407      -2
mknod_main                                           179     177      -2
handle_incoming_and_exit                            2653    2651      -2
argstr                                              1312    1310      -2
shiftcmd                                             131     128      -3
exitcmd                                               46      43      -3
dotcmd                                               297     294      -3
breakcmd                                              86      83      -3
evalpipe                                             353     349      -4
evalcommand                                         1180    1176      -4
evalcmd                                              109     105      -4
send_tree                                            374     369      -5
mkfifo_main                                           82      77      -5
evalsubshell                                         152     147      -5
typecmd                                               75      69      -6
letcmd                                                61      55      -6
add_cmd                                             1190    1183      -7
main                                                 891     883      -8
ash_main                                            1415    1407      -8
parse_stream                                        1377    1367     -10
alloc_procps_scan                                     55       -     -55
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 7/21 up/down: 54/-148)          Total: -94 bytes
   text    data     bss     dec     hex filename
 797195     658    7428  805281   c49a1 busybox_old
 797101     658    7428  805187   c4943 busybox_unstripped
2008-03-17 09:00:54 +00:00

72 lines
1.9 KiB
C

/* vi: set sw=4 ts=4: */
/*
* resize - set terminal width and height.
*
* Copyright 2006 Bernhard 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 ATTRIBUTE_UNUSED)
{
tcsetattr(STDERR_FILENO, TCSANOW, &old_termios);
exit(1);
}
int resize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int resize_main(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
{
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;
}