source: branches/3.2/mindi-busybox/console-tools/resize.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
  • Property svn:eol-style set to native
File size: 2.1 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
11//usage:#define resize_trivial_usage
12//usage:       ""
13//usage:#define resize_full_usage "\n\n"
14//usage:       "Resize the screen"
15
16#include "libbb.h"
17
18#define ESC "\033"
19
20#define old_termios_p ((struct termios*)&bb_common_bufsiz1)
21
22static void
23onintr(int sig UNUSED_PARAM)
24{
25    tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
26    _exit(EXIT_FAILURE);
27}
28
29int resize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
30int resize_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
31{
32    struct termios new;
33    struct winsize w = { 0, 0, 0, 0 };
34    int ret;
35
36    /* We use _stderr_ in order to make resize usable
37     * in shell backticks (those redirect stdout away from tty).
38     * NB: other versions of resize open "/dev/tty"
39     * and operate on it - should we do the same?
40     */
41
42    tcgetattr(STDERR_FILENO, old_termios_p); /* fiddle echo */
43    memcpy(&new, old_termios_p, sizeof(new));
44    new.c_cflag |= (CLOCAL | CREAD);
45    new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
46    bb_signals(0
47        + (1 << SIGINT)
48        + (1 << SIGQUIT)
49        + (1 << SIGTERM)
50        + (1 << SIGALRM)
51        , onintr);
52    tcsetattr(STDERR_FILENO, TCSANOW, &new);
53
54    /* save_cursor_pos 7
55     * scroll_whole_screen [r
56     * put_cursor_waaaay_off [$x;$yH
57     * get_cursor_pos [6n
58     * restore_cursor_pos 8
59     */
60    fprintf(stderr, ESC"7" ESC"[r" ESC"[999;999H" ESC"[6n");
61    alarm(3); /* Just in case terminal won't answer */
62//BUG: death by signal won't restore termios
63    scanf(ESC"[%hu;%huR", &w.ws_row, &w.ws_col);
64    fprintf(stderr, ESC"8");
65
66    /* BTW, other versions of resize recalculate w.ws_xpixel, ws.ws_ypixel
67     * by calculating character cell HxW from old values
68     * (gotten via TIOCGWINSZ) and recomputing *pixel values */
69    ret = ioctl(STDERR_FILENO, TIOCSWINSZ, &w);
70
71    tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
72
73    if (ENABLE_FEATURE_RESIZE_PRINT)
74        printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",
75            w.ws_col, w.ws_row);
76
77    return ret;
78}
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