form/frm_def.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2006,2007 Free Software Foundation, Inc.              *
   3  *                                                                          *
   4  * Permission is hereby granted, free of charge, to any person obtaining a  *
   5  * copy of this software and associated documentation files (the            *
   6  * "Software"), to deal in the Software without restriction, including      *
   7  * without limitation the rights to use, copy, modify, merge, publish,      *
   8  * distribute, distribute with modifications, sublicense, and/or sell       *
   9  * copies of the Software, and to permit persons to whom the Software is    *
  10  * furnished to do so, subject to the following conditions:                 *
  11  *                                                                          *
  12  * The above copyright notice and this permission notice shall be included  *
  13  * in all copies or substantial portions of the Software.                   *
  14  *                                                                          *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  22  *                                                                          *
  23  * Except as contained in this notice, the name(s) of the above copyright   *
  24  * holders shall not be used in advertising or otherwise to promote the     *
  25  * sale, use or other dealings in this Software without prior written       *
  26  * authorization.                                                           *
  27  ****************************************************************************/
  28
  29 /****************************************************************************
  30  *   Author:  Juergen Pfeifer, 1995,1997                                    *
  31  ****************************************************************************/
  32
  33 #include "form.priv.h"
  34
  35 MODULE_ID("$Id: frm_def.c,v 1.21 2007/02/03 23:37:46 tom Exp $")
  36
  37 /* this can't be readonly */
  38 static FORM default_form =
  39 {
  40   0,                            /* status     */
  41   0,                            /* rows       */
  42   0,                            /* cols       */
  43   0,                            /* currow     */
  44   0,                            /* curcol     */
  45   0,                            /* toprow     */
  46   0,                            /* begincol   */
  47   -1,                           /* maxfield   */
  48   -1,                           /* maxpage    */
  49   -1,                           /* curpage    */
  50   ALL_FORM_OPTS,                /* opts       */
  51   (WINDOW *)0,                  /* win        */
  52   (WINDOW *)0,                  /* sub        */
  53   (WINDOW *)0,                  /* w          */
  54   (FIELD **)0,                  /* field      */
  55   (FIELD *)0,                   /* current    */
  56   (_PAGE *) 0,                  /* page       */
  57   (char *)0,                    /* usrptr     */
  58   NULL,                         /* forminit   */
  59   NULL,                         /* formterm   */
  60   NULL,                         /* fieldinit  */
  61   NULL                          /* fieldterm  */
  62 };
  63
  64 NCURSES_EXPORT_VAR(FORM *) _nc_Default_Form = &default_form;
  65 \f
  66 /*---------------------------------------------------------------------------
  67 |   Facility      :  libnform
  68 |   Function      :  static FIELD *Insert_Field_By_Position(
  69 |                                     FIELD *new_field,
  70 |                                     FIELD *head )
  71 |
  72 |   Description   :  Insert new_field into sorted fieldlist with head "head"
  73 |                    and return new head of sorted fieldlist. Sorting
  74 |                    criteria is (row,column). This is a circular list.
  75 |
  76 |   Return Values :  New head of sorted fieldlist
  77 +--------------------------------------------------------------------------*/
  78 static FIELD *
  79 Insert_Field_By_Position(FIELD *newfield, FIELD *head)
  80 {
  81   FIELD *current, *newhead;
  82
  83   assert(newfield);
  84
  85   if (!head)
  86     {                           /* empty list is trivial */
  87       newhead = newfield->snext = newfield->sprev = newfield;
  88     }
  89   else
  90     {
  91       newhead = current = head;
  92       while ((current->frow < newfield->frow) ||
  93              ((current->frow == newfield->frow) &&
  94               (current->fcol < newfield->fcol)))
  95         {
  96           current = current->snext;
  97           if (current == head)
  98             {                   /* We cycled through. Reset head to indicate that */
  99               head = (FIELD *)0;
 100               break;
 101             }
 102         }
 103       /* we leave the loop with current pointing to the field after newfield */
 104       newfield->snext = current;
 105       newfield->sprev = current->sprev;
 106       newfield->snext->sprev = newfield;
 107       newfield->sprev->snext = newfield;
 108       if (current == head)
 109         newhead = newfield;
 110     }
 111   return (newhead);
 112 }
 113
 114 /*---------------------------------------------------------------------------
 115 |   Facility      :  libnform
 116 |   Function      :  static void Disconnect_Fields(FORM *form)
 117 |
 118 |   Description   :  Break association between form and array of fields.
 119 |
 120 |   Return Values :  -
 121 +--------------------------------------------------------------------------*/
 122 static void
 123 Disconnect_Fields(FORM *form)
 124 {
 125   if (form->field)
 126     {
 127       FIELD **fields;
 128
 129       for (fields = form->field; *fields; fields++)
 130         {
 131           if (form == (*fields)->form)
 132             (*fields)->form = (FORM *)0;
 133         }
 134
 135       form->rows = form->cols = 0;
 136       form->maxfield = form->maxpage = -1;
 137       form->field = (FIELD **)0;
 138       if (form->page)
 139         free(form->page);
 140       form->page = (_PAGE *) 0;
 141     }
 142 }
 143
 144 /*---------------------------------------------------------------------------
 145 |   Facility      :  libnform
 146 |   Function      :  static int Connect_Fields(FORM *form, FIELD **fields)
 147 |
 148 |   Description   :  Set association between form and array of fields.
 149 |
 150 |   Return Values :  E_OK            - no error
 151 |                    E_CONNECTED     - a field is already connected
 152 |                    E_BAD_ARGUMENT  - Invalid form pointer or field array
 153 |                    E_SYSTEM_ERROR  - not enough memory
 154 +--------------------------------------------------------------------------*/
 155 static int
 156 Connect_Fields(FORM *form, FIELD **fields)
 157 {
 158   int field_cnt, j;
 159   int page_nr;
 160   int maximum_row_in_field, maximum_col_in_field;
 161   _PAGE *pg;
 162
 163   T((T_CALLED("Connect_Fields(%p,%p)"), form, fields));
 164
 165   assert(form);
 166
 167   form->field = fields;
 168   form->maxfield = 0;
 169   form->maxpage = 0;
 170
 171   if (!fields)
 172     RETURN(E_OK);
 173
 174   page_nr = 0;
 175   /* store formpointer in fields and count pages */
 176   for (field_cnt = 0; fields[field_cnt]; field_cnt++)
 177     {
 178       if (fields[field_cnt]->form)
 179         RETURN(E_CONNECTED);
 180       if (field_cnt == 0 ||
 181           (fields[field_cnt]->status & _NEWPAGE))
 182         page_nr++;
 183       fields[field_cnt]->form = form;
 184     }
 185   if (field_cnt == 0 || (short)field_cnt < 0)
 186     RETURN(E_BAD_ARGUMENT);
 187
 188   /* allocate page structures */
 189   if ((pg = (_PAGE *) malloc(page_nr * sizeof(_PAGE))) != (_PAGE *) 0)
 190     {
 191       T((T_CREATE("_PAGE %p"), pg));
 192       form->page = pg;
 193     }
 194   else
 195     RETURN(E_SYSTEM_ERROR);
 196
 197   /* Cycle through fields and calculate page boundaries as well as
 198      size of the form */
 199   for (j = 0; j < field_cnt; j++)
 200     {
 201       if (j == 0)
 202         pg->pmin = j;
 203       else
 204         {
 205           if (fields[j]->status & _NEWPAGE)
 206             {
 207               pg->pmax = j - 1;
 208               pg++;
 209               pg->pmin = j;
 210             }
 211         }
 212
 213       maximum_row_in_field = fields[j]->frow + fields[j]->rows;
 214       maximum_col_in_field = fields[j]->fcol + fields[j]->cols;
 215
 216       if (form->rows < maximum_row_in_field)
 217         form->rows = maximum_row_in_field;
 218       if (form->cols < maximum_col_in_field)
 219         form->cols = maximum_col_in_field;
 220     }
 221
 222   pg->pmax = field_cnt - 1;
 223   form->maxfield = field_cnt;
 224   form->maxpage = page_nr;
 225
 226   /* Sort fields on form pages */
 227   for (page_nr = 0; page_nr < form->maxpage; page_nr++)
 228     {
 229       FIELD *fld = (FIELD *)0;
 230
 231       for (j = form->page[page_nr].pmin; j <= form->page[page_nr].pmax; j++)
 232         {
 233           fields[j]->index = j;
 234           fields[j]->page = page_nr;
 235           fld = Insert_Field_By_Position(fields[j], fld);
 236         }
 237       form->page[page_nr].smin = fld->index;
 238       form->page[page_nr].smax = fld->sprev->index;
 239     }
 240   RETURN(E_OK);
 241 }
 242
 243 /*---------------------------------------------------------------------------
 244 |   Facility      :  libnform
 245 |   Function      :  static int Associate_Fields(FORM *form, FIELD **fields)
 246 |
 247 |   Description   :  Set association between form and array of fields.
 248 |                    If there are fields, position to first active field.
 249 |
 250 |   Return Values :  E_OK            - success
 251 |                    E_BAD_ARGUMENT  - Invalid form pointer or field array
 252 |                    E_CONNECTED     - a field is already connected
 253 |                    E_SYSTEM_ERROR  - not enough memory
 254 +--------------------------------------------------------------------------*/
 255 NCURSES_INLINE static int
 256 Associate_Fields(FORM *form, FIELD **fields)
 257 {
 258   int res = Connect_Fields(form, fields);
 259
 260   if (res == E_OK)
 261     {
 262       if (form->maxpage > 0)
 263         {
 264           form->curpage = 0;
 265           form_driver(form, FIRST_ACTIVE_MAGIC);
 266         }
 267       else
 268         {
 269           form->curpage = -1;
 270           form->current = (FIELD *)0;
 271         }
 272     }
 273   return (res);
 274 }
 275
 276 /*---------------------------------------------------------------------------
 277 |   Facility      :  libnform
 278 |   Function      :  FORM *new_form( FIELD **fields )
 279 |
 280 |   Description   :  Create new form with given array of fields.
 281 |
 282 |   Return Values :  Pointer to form. NULL if error occurred.
 283 !                    Set errno:
 284 |                    E_OK            - success
 285 |                    E_BAD_ARGUMENT  - Invalid form pointer or field array
 286 |                    E_CONNECTED     - a field is already connected
 287 |                    E_SYSTEM_ERROR  - not enough memory
 288 +--------------------------------------------------------------------------*/
 289 NCURSES_EXPORT(FORM *)
 290 new_form(FIELD **fields)
 291 {
 292   int err = E_SYSTEM_ERROR;
 293
 294   FORM *form = (FORM *)malloc(sizeof(FORM));
 295
 296   T((T_CALLED("new_form(%p)"), fields));
 297   if (form)
 298     {
 299       T((T_CREATE("form %p"), form));
 300       *form = *_nc_Default_Form;
 301       if ((err = Associate_Fields(form, fields)) != E_OK)
 302         {
 303           free_form(form);
 304           form = (FORM *)0;
 305         }
 306     }
 307
 308   if (!form)
 309     SET_ERROR(err);
 310
 311   returnForm(form);
 312 }
 313
 314 /*---------------------------------------------------------------------------
 315 |   Facility      :  libnform
 316 |   Function      :  int free_form( FORM *form )
 317 |
 318 |   Description   :  Release internal memory associated with form.
 319 |
 320 |   Return Values :  E_OK           - no error
 321 |                    E_BAD_ARGUMENT - invalid form pointer
 322 |                    E_POSTED       - form is posted
 323 +--------------------------------------------------------------------------*/
 324 NCURSES_EXPORT(int)
 325 free_form(FORM *form)
 326 {
 327   T((T_CALLED("free_form(%p)"), form));
 328
 329   if (!form)
 330     RETURN(E_BAD_ARGUMENT);
 331
 332   if (form->status & _POSTED)
 333     RETURN(E_POSTED);
 334
 335   Disconnect_Fields(form);
 336   if (form->page)
 337     free(form->page);
 338   free(form);
 339
 340   RETURN(E_OK);
 341 }
 342
 343 /*---------------------------------------------------------------------------
 344 |   Facility      :  libnform
 345 |   Function      :  int set_form_fields( FORM *form, FIELD **fields )
 346 |
 347 |   Description   :  Set a new association of an array of fields to a form
 348 |
 349 |   Return Values :  E_OK            - no error
 350 |                    E_BAD_ARGUMENT  - Invalid form pointer or field array
 351 |                    E_CONNECTED     - a field is already connected
 352 |                    E_POSTED        - form is posted
 353 |                    E_SYSTEM_ERROR  - not enough memory
 354 +--------------------------------------------------------------------------*/
 355 NCURSES_EXPORT(int)
 356 set_form_fields(FORM *form, FIELD **fields)
 357 {
 358   FIELD **old;
 359   int res;
 360
 361   T((T_CALLED("set_form_fields(%p,%p)"), form, fields));
 362
 363   if (!form)
 364     RETURN(E_BAD_ARGUMENT);
 365
 366   if (form->status & _POSTED)
 367     RETURN(E_POSTED);
 368
 369   old = form->field;
 370   Disconnect_Fields(form);
 371
 372   if ((res = Associate_Fields(form, fields)) != E_OK)
 373     Connect_Fields(form, old);
 374
 375   RETURN(res);
 376 }
 377
 378 /*---------------------------------------------------------------------------
 379 |   Facility      :  libnform
 380 |   Function      :  FIELD **form_fields( const FORM *form )
 381 |
 382 |   Description   :  Retrieve array of fields
 383 |
 384 |   Return Values :  Pointer to field array
 385 +--------------------------------------------------------------------------*/
 386 NCURSES_EXPORT(FIELD **)
 387 form_fields(const FORM *form)
 388 {
 389   T((T_CALLED("form_field(%p)"), form));
 390   returnFieldPtr(Normalize_Form(form)->field);
 391 }
 392
 393 /*---------------------------------------------------------------------------
 394 |   Facility      :  libnform
 395 |   Function      :  int field_count( const FORM *form )
 396 |
 397 |   Description   :  Retrieve number of fields
 398 |
 399 |   Return Values :  Number of fields, -1 if none are defined
 400 +--------------------------------------------------------------------------*/
 401 NCURSES_EXPORT(int)
 402 field_count(const FORM *form)
 403 {
 404   T((T_CALLED("field_count(%p)"), form));
 405
 406   returnCode(Normalize_Form(form)->maxfield);
 407 }
 408
 409 /* frm_def.c ends here */