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    revision 532 by niro, Sat Sep 1 22:45:15 2007 UTC revision 816 by niro, Fri Apr 24 18:33:46 2009 UTC
    # Line 2  Line 2 
    2  /*  /*
    3   * resize - set terminal width and height.   * resize - set terminal width and height.
    4   *   *
    5   * Copyright 2006 Bernhard Fischer   * Copyright 2006 Bernhard Reutner-Fischer
    6   *   *
    7   * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.   * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    8   */   */
    9  /* no options, no getopt */  /* no options, no getopt */
    10  #include "busybox.h"  #include "libbb.h"
    11    
    12  int resize_main(int argc, char **argv)  #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 old, new;   struct termios new;
    27   struct winsize w = {0,0,0,0};   struct winsize w = { 0, 0, 0, 0 };
    28   int ret;   int ret;
    29    
    30   tcgetattr(STDOUT_FILENO, &old); /* fiddle echo */   /* We use _stderr_ in order to make resize usable
    31   new = old;   * 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);   new.c_cflag |= (CLOCAL | CREAD);
    39   new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);   new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
    40   tcsetattr(STDOUT_FILENO, TCSANOW, &new);   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   /* save_cursor_pos 7
    49   * scroll_whole_screen [r   * scroll_whole_screen [r
    50   * put_cursor_waaaay_off [$x;$yH   * put_cursor_waaaay_off [$x;$yH
    51   * get_cursor_pos [6n   * get_cursor_pos [6n
    52   * restore_cursor_pos 8   * restore_cursor_pos 8
    53   */   */
    54   printf("\0337\033[r\033[999;999H\033[6n");   fprintf(stderr, ESC"7" ESC"[r" ESC"[999;999H" ESC"[6n");
    55   scanf("\033[%hu;%huR", &w.ws_row, &w.ws_col);   alarm(3); /* Just in case terminal won't answer */
    56   ret = ioctl(STDOUT_FILENO, TIOCSWINSZ, &w);   scanf(ESC"[%hu;%huR", &w.ws_row, &w.ws_col);
    57   printf("\0338");   fprintf(stderr, ESC"8");
    58   tcsetattr(STDOUT_FILENO, TCSANOW, &old);  
    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)   if (ENABLE_FEATURE_RESIZE_PRINT)
    67   printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",   printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",
    68   w.ws_col, w.ws_row);   w.ws_col, w.ws_row);
    69    
    70   return ret;   return ret;
    71  }  }
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