1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * resize - set terminal width and height.
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4 | *
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5 | * Copyright 2006 Bernhard Reutner-Fischer
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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8 | */
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9 | /* no options, no getopt */
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10 | #include "libbb.h"
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11 |
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12 | #define ESC "\033"
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13 |
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14 | #define old_termios_p ((struct termios*)&bb_common_bufsiz1)
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15 |
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16 | static void
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17 | onintr(int sig UNUSED_PARAM)
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18 | {
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19 | tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
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20 | _exit(EXIT_FAILURE);
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21 | }
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22 |
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23 | int resize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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24 | int resize_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
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25 | {
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26 | struct termios new;
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27 | struct winsize w = { 0, 0, 0, 0 };
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28 | int ret;
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29 |
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30 | /* We use _stderr_ in order to make resize usable
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31 | * in shell backticks (those redirect stdout away from tty).
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32 | * NB: other versions of resize open "/dev/tty"
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33 | * and operate on it - should we do the same?
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34 | */
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35 |
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36 | tcgetattr(STDERR_FILENO, old_termios_p); /* fiddle echo */
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37 | memcpy(&new, old_termios_p, sizeof(new));
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38 | new.c_cflag |= (CLOCAL | CREAD);
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39 | new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
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40 | bb_signals(0
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41 | + (1 << SIGINT)
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42 | + (1 << SIGQUIT)
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43 | + (1 << SIGTERM)
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44 | + (1 << SIGALRM)
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45 | , onintr);
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46 | tcsetattr(STDERR_FILENO, TCSANOW, &new);
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47 |
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48 | /* save_cursor_pos 7
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49 | * scroll_whole_screen [r
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50 | * put_cursor_waaaay_off [$x;$yH
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51 | * get_cursor_pos [6n
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52 | * restore_cursor_pos 8
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53 | */
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54 | fprintf(stderr, ESC"7" ESC"[r" ESC"[999;999H" ESC"[6n");
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55 | alarm(3); /* Just in case terminal won't answer */
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56 | scanf(ESC"[%hu;%huR", &w.ws_row, &w.ws_col);
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57 | fprintf(stderr, ESC"8");
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58 |
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59 | /* BTW, other versions of resize recalculate w.ws_xpixel, ws.ws_ypixel
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60 | * by calculating character cell HxW from old values
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61 | * (gotten via TIOCGWINSZ) and recomputing *pixel values */
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62 | ret = ioctl(STDERR_FILENO, TIOCSWINSZ, &w);
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63 |
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64 | tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
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65 |
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66 | if (ENABLE_FEATURE_RESIZE_PRINT)
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67 | printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",
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68 | w.ws_col, w.ws_row);
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69 |
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70 | return ret;
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71 | }
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