Annotation of /tags/mkinitrd-6_1_11/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
Original Path: trunk/mkinitrd-magellan/busybox/console-tools/resize.c
File MIME type: text/plain
File size: 1903 byte(s)
Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
Original Path: trunk/mkinitrd-magellan/busybox/console-tools/resize.c
File MIME type: text/plain
File size: 1903 byte(s)
-updated to busybox-1.13.4
1 | niro | 532 | /* vi: set sw=4 ts=4: */ |
2 | /* | ||
3 | * resize - set terminal width and height. | ||
4 | * | ||
5 | niro | 816 | * Copyright 2006 Bernhard Reutner-Fischer |
6 | niro | 532 | * |
7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. | ||
8 | */ | ||
9 | /* no options, no getopt */ | ||
10 | niro | 816 | #include "libbb.h" |
11 | niro | 532 | |
12 | niro | 816 | #define ESC "\033" |
13 | |||
14 | #define old_termios (*(struct termios*)&bb_common_bufsiz1) | ||
15 | |||
16 | static void | ||
17 | onintr(int sig UNUSED_PARAM) | ||
18 | niro | 532 | { |
19 | niro | 816 | 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 | niro | 532 | int ret; |
29 | |||
30 | niro | 816 | /* 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 | niro | 532 | new.c_cflag |= (CLOCAL | CREAD); |
39 | new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); | ||
40 | niro | 816 | 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 | niro | 532 | /* 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 | niro | 816 | 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 | niro | 532 | if (ENABLE_FEATURE_RESIZE_PRINT) |
67 | printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n", | ||
68 | w.ws_col, w.ws_row); | ||
69 | niro | 816 | |
70 | niro | 532 | return ret; |
71 | } |