lib/libmenu/driver.c

   1 /*      $NetBSD: driver.c,v 1.8 2002/07/29 13:03:51 blymn Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1998-1999 Brett Lymn (blymn@baea.com.au, brett_lymn@yahoo.com.au)
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. The name of the author may not be used to endorse or promote products
  13  *    derived from this software without specific prior written permission
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  *
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __RCSID("$NetBSD$");
  31
  32 #include <menu.h>
  33 #include <ctype.h>
  34 #include <stdlib.h>
  35 #include "internals.h"
  36
  37 /*
  38  * The guts of the menu library.  This function processes the character
  39  * in c and performs actions based on the value of the character.  If the
  40  * character is a normal one then the driver attempts to match the character
  41  * against the items.  If the character is a recognised request then the
  42  * request is processed by the driver, if the character is not a recognised
  43  * request and is not printable then it assumed to be a user defined command.
  44  */
  45 int
  46 menu_driver(MENU *menu, int c)
  47 {
  48         int drv_top_row, drv_scroll, i, it, status = E_OK;
  49         ITEM *drv_new_item;
  50
  51         i = 0;
  52
  53         if (menu == NULL)
  54                 return E_BAD_ARGUMENT;
  55         if (menu->posted == 0)
  56                 return E_NOT_POSTED;
  57         if (menu->items == NULL)
  58                 return E_NOT_CONNECTED;
  59         if (*menu->items == NULL)
  60                 return E_NOT_CONNECTED;
  61         if (menu->in_init == 1)
  62                 return E_BAD_STATE;
  63
  64           /* this one should never happen but just in case.... */
  65         if (menu->items[menu->cur_item] == NULL)
  66                 return E_SYSTEM_ERROR;
  67
  68         drv_new_item = menu->items[menu->cur_item];
  69         it = menu->cur_item;
  70         drv_top_row = menu->top_row;
  71
  72         if ((c > REQ_BASE_NUM) && (c <= MAX_COMMAND)) {
  73                   /* is a known driver request  - first check if the pattern
  74                    * buffer needs to be cleared, we do this on non-search
  75                    * type requests.
  76                    */
  77                 if (! ((c == REQ_BACK_PATTERN) || (c == REQ_NEXT_MATCH) ||
  78                        (c == REQ_PREV_MATCH))) {
  79                         if ((c == REQ_CLEAR_PATTERN)
  80                             && (menu->pattern == NULL))
  81                                 return E_REQUEST_DENIED;
  82                         free(menu->pattern);
  83                         menu->pattern = NULL;
  84                         menu->plen = 0;
  85                         menu->match_len = 0;
  86                 }
  87
  88                 switch (c) {
  89                   case REQ_LEFT_ITEM:
  90                           drv_new_item = drv_new_item->left;
  91                           break;
  92                   case REQ_RIGHT_ITEM:
  93                           drv_new_item = drv_new_item->right;
  94                           break;
  95                   case REQ_UP_ITEM:
  96                           drv_new_item = drv_new_item->up;
  97                           break;
  98                   case REQ_DOWN_ITEM:
  99                           drv_new_item = drv_new_item->down;
 100                           break;
 101                   case REQ_SCR_ULINE:
 102                           if (drv_top_row == 0)
 103                                   return E_REQUEST_DENIED;
 104                           drv_top_row--;
 105                           drv_new_item = drv_new_item->up;
 106                           break;
 107                   case REQ_SCR_DLINE:
 108                           drv_top_row++;
 109                           if ((drv_top_row + menu->rows - 1)> menu->item_rows)
 110                                   return E_REQUEST_DENIED;
 111                           drv_new_item = drv_new_item->down;
 112                           break;
 113                   case REQ_SCR_DPAGE:
 114                           drv_scroll = menu->item_rows - menu->rows
 115                                   - menu->top_row;
 116                           if (drv_scroll > menu->rows) {
 117                                   drv_scroll = menu->rows;
 118                           }
 119
 120                           if (drv_scroll <= 0) {
 121                                   return E_REQUEST_DENIED;
 122                           } else {
 123                                   drv_top_row += drv_scroll;
 124                                   while (drv_scroll-- > 0)
 125                                           drv_new_item = drv_new_item->down;
 126                           }
 127                           break;
 128                   case REQ_SCR_UPAGE:
 129                           if (menu->rows < menu->top_row) {
 130                                   drv_scroll = menu->rows;
 131                           } else {
 132                                   drv_scroll = menu->top_row;
 133                           }
 134                           if (drv_scroll == 0)
 135                                   return E_REQUEST_DENIED;
 136
 137                           drv_top_row -= drv_scroll;
 138                           while (drv_scroll-- > 0)
 139                                   drv_new_item = drv_new_item->up;
 140                           break;
 141                   case REQ_FIRST_ITEM:
 142                           drv_new_item = menu->items[0];
 143                           break;
 144                   case REQ_LAST_ITEM:
 145                           drv_new_item = menu->items[menu->item_count - 1];
 146                           break;
 147                   case REQ_NEXT_ITEM:
 148                           if ((menu->cur_item + 1) >= menu->item_count) {
 149                                   if ((menu->opts & O_NONCYCLIC)
 150                                       == O_NONCYCLIC) {
 151                                           return E_REQUEST_DENIED;
 152                                   } else {
 153                                           drv_new_item = menu->items[0];
 154                                   }
 155                           } else {
 156                                   drv_new_item =
 157                                           menu->items[menu->cur_item + 1];
 158                           }
 159                           break;
 160                   case REQ_PREV_ITEM:
 161                           if (menu->cur_item == 0) {
 162                                   if ((menu->opts & O_NONCYCLIC)
 163                                       == O_NONCYCLIC) {
 164                                           return E_REQUEST_DENIED;
 165                                   } else {
 166                                           drv_new_item = menu->items[
 167                                                   menu->item_count - 1];
 168                                   }
 169                           } else {
 170                                   drv_new_item =
 171                                           menu->items[menu->cur_item - 1];
 172                           }
 173                           break;
 174                   case REQ_TOGGLE_ITEM:
 175                           if ((menu->opts & (O_RADIO | O_ONEVALUE)) != 0) {
 176                               if ((menu->opts & O_RADIO) == O_RADIO) {
 177                                   if ((drv_new_item->opts & O_SELECTABLE)
 178                                                         != O_SELECTABLE)
 179                                           return E_NOT_SELECTABLE;
 180
 181                                     /* don't deselect selected item */
 182                                   if (drv_new_item->selected == 1)
 183                                           return E_REQUEST_DENIED;
 184
 185                                   /* deselect all items */
 186                                   for (i = 0; i < menu->item_count; i++) {
 187                                       if ((menu->items[i]->selected) &&
 188                                           (drv_new_item->index != i)) {
 189                                           menu->items[i]->selected ^= 1;
 190                                           _menui_draw_item(menu,
 191                                                 menu->items[i]->index);
 192                                       }
 193                                   }
 194
 195                                     /* turn on selected item */
 196                                   drv_new_item->selected ^= 1;
 197                                   _menui_draw_item(menu, drv_new_item->index);
 198                               } else {
 199                                   return E_REQUEST_DENIED;
 200                               }
 201                           } else {
 202                                   if ((drv_new_item->opts
 203                                        & O_SELECTABLE) == O_SELECTABLE) {
 204                                             /* toggle select flag */
 205                                           drv_new_item->selected ^= 1;
 206                                             /* update item in menu */
 207                                           _menui_draw_item(menu,
 208                                                 drv_new_item->index);
 209                                   } else {
 210                                           return E_NOT_SELECTABLE;
 211                                   }
 212                           }
 213                           break;
 214                   case REQ_CLEAR_PATTERN:
 215                             /* this action is taken before the
 216                                case statement */
 217                           break;
 218                   case REQ_BACK_PATTERN:
 219                           if (menu->pattern == NULL)
 220                                   return E_REQUEST_DENIED;
 221
 222                           if (menu->plen == 0)
 223                                   return E_REQUEST_DENIED;
 224                           menu->pattern[menu->plen--] = '\0';
 225                           break;
 226                   case REQ_NEXT_MATCH:
 227                           if (menu->pattern == NULL)
 228                                   return E_REQUEST_DENIED;
 229
 230                           status = _menui_match_pattern(menu, 0,
 231                                                          MATCH_NEXT_FORWARD,
 232                                                          &it);
 233                           drv_new_item = menu->items[it];
 234                           break;
 235                   case REQ_PREV_MATCH:
 236                           if (menu->pattern == NULL)
 237                                   return E_REQUEST_DENIED;
 238
 239                           status = _menui_match_pattern(menu, 0,
 240                                                          MATCH_NEXT_REVERSE,
 241                                                          &it);
 242                           drv_new_item = menu->items[it];
 243                           break;
 244                 }
 245         } else if (c > MAX_COMMAND) {
 246                   /* must be a user command */
 247                 return E_UNKNOWN_COMMAND;
 248         } else if (isprint((unsigned char) c)) {
 249                   /* otherwise search items for the character. */
 250                 status = _menui_match_pattern(menu, (unsigned char) c,
 251                                                MATCH_FORWARD, &it);
 252                 drv_new_item = menu->items[it];
 253
 254                   /* update the position of the cursor if we are doing
 255                    * show match and the current item has not changed.  If
 256                    * we don't do this here it won't get done since the
 257                    * display will not be updated due to the current item
 258                    * not changing.
 259                    */
 260                 if ((drv_new_item->index == menu->cur_item)
 261                     && ((menu->opts & O_SHOWMATCH) == O_SHOWMATCH)) {
 262                         pos_menu_cursor(menu);
 263                 }
 264
 265
 266         } else {
 267                   /* bad character */
 268                 return E_BAD_ARGUMENT;
 269         }
 270
 271         if (drv_new_item == NULL)
 272                 return E_REQUEST_DENIED;
 273
 274         if (drv_new_item->row < drv_top_row) drv_top_row = drv_new_item->row;
 275         if (drv_new_item->row >= (drv_top_row + menu->rows))
 276                 drv_top_row = drv_new_item->row - menu->rows + 1;
 277
 278         if ((drv_new_item->index != menu->cur_item)
 279             || (drv_top_row != menu->top_row))
 280                 _menui_goto_item(menu, drv_new_item, drv_top_row);
 281
 282         return status;
 283 }
 284
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 288