src/hci/mucurses/clear.c

   1 #include <curses.h>
   2 #include "mucurses.h"
   3 #include "cursor.h"
   4
   5 /** @file
   6  *
   7  * MuCurses clearing functions
   8  *
   9  */
  10
  11 FILE_LICENCE ( GPL2_OR_LATER );
  12
  13 /**
  14  * Clear a window to the bottom from current cursor position
  15  *
  16  * @v *win      subject window
  17  * @ret rc      return status code
  18  */
  19 int wclrtobot ( WINDOW *win ) {
  20         struct cursor_pos pos;
  21
  22         _store_curs_pos( win, &pos );
  23         do {
  24                 _wputc( win, ' ', WRAP );
  25         } while ( win->curs_y + win->curs_x );
  26         _restore_curs_pos( win, &pos );
  27
  28         return OK;
  29 }
  30
  31 /**
  32  * Clear a window to the end of the current line
  33  *
  34  * @v *win      subject window
  35  * @ret rc      return status code
  36  */
  37 int wclrtoeol ( WINDOW *win ) {
  38         struct cursor_pos pos;
  39
  40         _store_curs_pos( win, &pos );
  41         while ( ( win->curs_y - pos.y ) == 0 ) {
  42                 _wputc( win, ' ', WRAP );
  43         }
  44         _restore_curs_pos( win, &pos );
  45
  46         return OK;
  47 }
  48
  49 /**
  50  * Delete character under the cursor in a window
  51  *
  52  * @v *win      subject window
  53  * @ret rc      return status code
  54  */
  55 int wdelch ( WINDOW *win ) {
  56         _wputc( win, ' ', NOWRAP );
  57         _wcursback( win );
  58
  59         return OK;
  60 }
  61
  62 /**
  63  * Delete line under a window's cursor
  64  *
  65  * @v *win      subject window
  66  * @ret rc      return status code
  67  */
  68 int wdeleteln ( WINDOW *win ) {
  69         struct cursor_pos pos;
  70
  71         _store_curs_pos( win, &pos );
  72         /* let's just set the cursor to the beginning of the line and
  73            let wclrtoeol do the work :) */
  74         wmove( win, win->curs_y, 0 );
  75         wclrtoeol( win );
  76         _restore_curs_pos( win, &pos );
  77         return OK;
  78 }
  79
  80 /**
  81  * Completely clear a window
  82  *
  83  * @v *win      subject window
  84  * @ret rc      return status code
  85  */
  86 int werase ( WINDOW *win ) {
  87         wmove( win, 0, 0 );
  88         wclrtobot( win );
  89         return OK;
  90 }