source: branches/2.2.5/mindi-busybox/console-tools/resize.c @ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 13 years ago

Update to busybox 1.7.2

  • Property svn:eol-style set to native
File size: 1.8 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * resize - set terminal width and height.
4 *
5 * Copyright 2006 Bernhard Fischer
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9/* no options, no getopt */
10#include "libbb.h"
11
12#define ESC "\033"
13
14#define old_termios (*(struct termios*)&bb_common_bufsiz1)
15
16static void
17onintr(int sig ATTRIBUTE_UNUSED)
18{
19    tcsetattr(STDERR_FILENO, TCSANOW, &old_termios);
20    exit(1);
21}
22
23int resize_main(int argc, char **argv);
24int resize_main(int argc, char **argv)
25{
26    struct termios new;
27    struct winsize w = { 0,0,0,0 };
28    int ret;
29
30    /* We use _stderr_ in order to make resize usable
31     * in shell backticks (those redirect stdout away from tty).
32     * NB: other versions of resize open "/dev/tty"
33     * and operate on it - should we do the same?
34     */
35
36    tcgetattr(STDERR_FILENO, &old_termios); /* fiddle echo */
37    new = old_termios;
38    new.c_cflag |= (CLOCAL | CREAD);
39    new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
40    signal(SIGINT, onintr);
41    signal(SIGQUIT, onintr);
42    signal(SIGTERM, onintr);
43    signal(SIGALRM, onintr);
44    tcsetattr(STDERR_FILENO, TCSANOW, &new);
45
46    /* save_cursor_pos 7
47     * scroll_whole_screen [r
48     * put_cursor_waaaay_off [$x;$yH
49     * get_cursor_pos [6n
50     * restore_cursor_pos 8
51     */
52    fprintf(stderr, ESC"7" ESC"[r" ESC"[999;999H" ESC"[6n");
53    alarm(3); /* Just in case terminal won't answer */
54    scanf(ESC"[%hu;%huR", &w.ws_row, &w.ws_col);
55    fprintf(stderr, ESC"8");
56
57    /* BTW, other versions of resize recalculate w.ws_xpixel, ws.ws_ypixel
58     * by calculating character cell HxW from old values
59     * (gotten via TIOCGWINSZ) and recomputing *pixel values */
60    ret = ioctl(STDERR_FILENO, TIOCSWINSZ, &w);
61
62    tcsetattr(STDERR_FILENO, TCSANOW, &old_termios);
63
64    if (ENABLE_FEATURE_RESIZE_PRINT)
65        printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",
66            w.ws_col, w.ws_row);
67
68    return ret;
69}
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