source: branches/3.0/mindi-busybox/console-tools/resize.c @ 3085

Last change on this file since 3085 was 2725, checked in by bruno, 8 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
  • Property svn:eol-style set to native
File size: 1.9 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * resize - set terminal width and height.
4 *
5 * Copyright 2006 Bernhard Reutner-Fischer
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 */
9/* no options, no getopt */
10#include "libbb.h"
11
12#define ESC "\033"
13
14#define old_termios_p ((struct termios*)&bb_common_bufsiz1)
15
16static void
17onintr(int sig UNUSED_PARAM)
18{
19    tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
20    _exit(EXIT_FAILURE);
21}
22
23int resize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
24int resize_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
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_p); /* fiddle echo */
37    memcpy(&new, old_termios_p, sizeof(new));
38    new.c_cflag |= (CLOCAL | CREAD);
39    new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
40    bb_signals(0
41        + (1 << SIGINT)
42        + (1 << SIGQUIT)
43        + (1 << SIGTERM)
44        + (1 << SIGALRM)
45        , onintr);
46    tcsetattr(STDERR_FILENO, TCSANOW, &new);
47
48    /* save_cursor_pos 7
49     * scroll_whole_screen [r
50     * put_cursor_waaaay_off [$x;$yH
51     * get_cursor_pos [6n
52     * restore_cursor_pos 8
53     */
54    fprintf(stderr, ESC"7" ESC"[r" ESC"[999;999H" ESC"[6n");
55    alarm(3); /* Just in case terminal won't answer */
56    scanf(ESC"[%hu;%huR", &w.ws_row, &w.ws_col);
57    fprintf(stderr, ESC"8");
58
59    /* BTW, other versions of resize recalculate w.ws_xpixel, ws.ws_ypixel
60     * by calculating character cell HxW from old values
61     * (gotten via TIOCGWINSZ) and recomputing *pixel values */
62    ret = ioctl(STDERR_FILENO, TIOCSWINSZ, &w);
63
64    tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
65
66    if (ENABLE_FEATURE_RESIZE_PRINT)
67        printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",
68            w.ws_col, w.ws_row);
69
70    return ret;
71}
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