src/hci/mucurses/widgets/editbox.c

   1 /*
   2  * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 FILE_LICENCE ( GPL2_OR_LATER );
  20
  21 #include <string.h>
  22 #include <assert.h>
  23 #include <gpxe/editbox.h>
  24
  25 /** @file
  26  *
  27  * Editable text box widget
  28  *
  29  */
  30
  31 #define EDITBOX_MIN_CHARS 3
  32
  33 /**
  34  * Initialise text box widget
  35  *
  36  * @v box               Editable text box widget
  37  * @v buf               Text buffer
  38  * @v len               Size of text buffer
  39  * @v win               Containing window
  40  * @v row               Row
  41  * @v col               Starting column
  42  * @v width             Width
  43  * @v flags             Flags
  44  */
  45 void init_editbox ( struct edit_box *box, char *buf, size_t len,
  46                     WINDOW *win, unsigned int row, unsigned int col,
  47                     unsigned int width, unsigned int flags ) {
  48         memset ( box, 0, sizeof ( *box ) );
  49         box->string.buf = buf;
  50         box->string.len = len;
  51         box->string.cursor = strlen ( buf );
  52         box->win = ( win ? win : stdscr );
  53         box->row = row;
  54         box->col = col;
  55         box->width = width;
  56         box->flags = flags;
  57 }
  58
  59 /**
  60  * Draw text box widget
  61  *
  62  * @v box               Editable text box widget
  63  *
  64  */
  65 void draw_editbox ( struct edit_box *box ) {
  66         size_t width = box->width;
  67         char buf[ width + 1 ];
  68         signed int cursor_offset, underflow, overflow, first;
  69         size_t len;
  70
  71         /* Adjust starting offset so that cursor remains within box */
  72         cursor_offset = ( box->string.cursor - box->first );
  73         underflow = ( EDITBOX_MIN_CHARS - cursor_offset );
  74         overflow = ( cursor_offset - ( width - 1 ) );
  75         first = box->first;
  76         if ( underflow > 0 ) {
  77                 first -= underflow;
  78                 if ( first < 0 )
  79                         first = 0;
  80         } else if ( overflow > 0 ) {
  81                 first += overflow;
  82         }
  83         box->first = first;
  84         cursor_offset = ( box->string.cursor - first );
  85
  86         /* Construct underscore-padded string portion */
  87         memset ( buf, '_', width );
  88         buf[width] = '\0';
  89         len = ( strlen ( box->string.buf ) - first );
  90         if ( len > width )
  91                 len = width;
  92         if ( box->flags & EDITBOX_STARS ) {
  93                 memset ( buf, '*', len );
  94         } else {
  95                 memcpy ( buf, ( box->string.buf + first ), len );
  96         }
  97
  98         /* Print box content and move cursor */
  99         if ( ! box->win )
 100                 box->win = stdscr;
 101         mvwprintw ( box->win, box->row, box->col, "%s", buf );
 102         wmove ( box->win, box->row, ( box->col + cursor_offset ) );
 103 }