[1765] | 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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[2725] | 5 | * Copyright 2006 Bernhard Reutner-Fischer
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[1765] | 6 | *
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[2725] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[1765] | 8 | */
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| 9 | /* no options, no getopt */
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[3232] | 10 |
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| 11 | //usage:#define resize_trivial_usage
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| 12 | //usage: ""
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| 13 | //usage:#define resize_full_usage "\n\n"
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| 14 | //usage: "Resize the screen"
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| 15 |
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[1765] | 16 | #include "libbb.h"
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| 17 |
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| 18 | #define ESC "\033"
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| 19 |
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[2725] | 20 | #define old_termios_p ((struct termios*)&bb_common_bufsiz1)
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[1765] | 21 |
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| 22 | static void
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[2725] | 23 | onintr(int sig UNUSED_PARAM)
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[1765] | 24 | {
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[2725] | 25 | tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
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| 26 | _exit(EXIT_FAILURE);
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[1765] | 27 | }
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| 28 |
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[2725] | 29 | int resize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 30 | int resize_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
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[1765] | 31 | {
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| 32 | struct termios new;
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[2725] | 33 | struct winsize w = { 0, 0, 0, 0 };
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[1765] | 34 | int ret;
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| 35 |
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| 36 | /* We use _stderr_ in order to make resize usable
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| 37 | * in shell backticks (those redirect stdout away from tty).
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| 38 | * NB: other versions of resize open "/dev/tty"
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| 39 | * and operate on it - should we do the same?
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| 40 | */
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| 41 |
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[2725] | 42 | tcgetattr(STDERR_FILENO, old_termios_p); /* fiddle echo */
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| 43 | memcpy(&new, old_termios_p, sizeof(new));
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[1765] | 44 | new.c_cflag |= (CLOCAL | CREAD);
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| 45 | new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
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[2725] | 46 | bb_signals(0
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| 47 | + (1 << SIGINT)
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| 48 | + (1 << SIGQUIT)
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| 49 | + (1 << SIGTERM)
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| 50 | + (1 << SIGALRM)
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| 51 | , onintr);
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[1765] | 52 | tcsetattr(STDERR_FILENO, TCSANOW, &new);
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| 53 |
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| 54 | /* save_cursor_pos 7
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| 55 | * scroll_whole_screen [r
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| 56 | * put_cursor_waaaay_off [$x;$yH
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| 57 | * get_cursor_pos [6n
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| 58 | * restore_cursor_pos 8
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| 59 | */
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| 60 | fprintf(stderr, ESC"7" ESC"[r" ESC"[999;999H" ESC"[6n");
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| 61 | alarm(3); /* Just in case terminal won't answer */
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[3232] | 62 | //BUG: death by signal won't restore termios
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[1765] | 63 | scanf(ESC"[%hu;%huR", &w.ws_row, &w.ws_col);
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| 64 | fprintf(stderr, ESC"8");
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| 65 |
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| 66 | /* BTW, other versions of resize recalculate w.ws_xpixel, ws.ws_ypixel
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| 67 | * by calculating character cell HxW from old values
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| 68 | * (gotten via TIOCGWINSZ) and recomputing *pixel values */
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| 69 | ret = ioctl(STDERR_FILENO, TIOCSWINSZ, &w);
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| 70 |
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[2725] | 71 | tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
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[1765] | 72 |
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| 73 | if (ENABLE_FEATURE_RESIZE_PRINT)
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| 74 | printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",
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| 75 | w.ws_col, w.ws_row);
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| 76 |
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| 77 | return ret;
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| 78 | }
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