Contents of /trunk/mkinitrd-magellan/busybox/console-tools/resize.c
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Revision 816 -
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Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
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File size: 1903 byte(s)
Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
File MIME type: text/plain
File size: 1903 byte(s)
-updated to busybox-1.13.4
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 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 | |
16 | static void |
17 | onintr(int sig UNUSED_PARAM) |
18 | { |
19 | tcsetattr(STDERR_FILENO, TCSANOW, &old_termios); |
20 | exit(EXIT_FAILURE); |
21 | } |
22 | |
23 | int resize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
24 | int 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); /* fiddle echo */ |
37 | new = old_termios; |
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); |
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 | } |