contrib/ncurses-5.4/form/frm_def.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2002,2003 Free Software Foundation, Inc.              *
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  13  * in all copies or substantial portions of the Software.                   *
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  28
  29 /****************************************************************************
  30  *   Author:  Juergen Pfeifer, 1995,1997                                    *
  31  ****************************************************************************/
  32
  33 #include "form.priv.h"
  34
  35 MODULE_ID("$Id: frm_def.c,v 1.13 2003/11/08 20:37:53 tom Exp $")
  36
  37 /* this can't be readonly */
  38 static FORM default_form = {
  39   0,                                    /* status     */
  40   0,                                    /* rows       */
  41   0,                                    /* cols       */
  42   0,                                    /* currow     */
  43   0,                                    /* curcol     */
  44   0,                                    /* toprow     */
  45   0,                                    /* begincol   */
  46   -1,                                   /* maxfield   */
  47   -1,                                   /* maxpage    */
  48   -1,                                   /* curpage    */
  49   ALL_FORM_OPTS,                        /* opts       */
  50   (WINDOW *)0,                          /* win        */
  51   (WINDOW *)0,                          /* sub        */
  52   (WINDOW *)0,                          /* w          */
  53   (FIELD **)0,                          /* field      */
  54   (FIELD *)0,                           /* current    */
  55   (_PAGE *)0,                           /* page       */
  56   (char *)0,                            /* usrptr     */
  57   NULL,                                 /* forminit   */
  58   NULL,                                 /* formterm   */
  59   NULL,                                 /* fieldinit  */
  60   NULL                                  /* fieldterm  */
  61 };
  62
  63 NCURSES_EXPORT_VAR(FORM *) _nc_Default_Form = &default_form;
  64 \f
  65 /*---------------------------------------------------------------------------
  66 |   Facility      :  libnform
  67 |   Function      :  static FIELD *Insert_Field_By_Position(
  68 |                                     FIELD *new_field,
  69 |                                     FIELD *head )
  70 |
  71 |   Description   :  Insert new_field into sorted fieldlist with head "head"
  72 |                    and return new head of sorted fieldlist. Sorting
  73 |                    criteria is (row,column). This is a circular list.
  74 |
  75 |   Return Values :  New head of sorted fieldlist
  76 +--------------------------------------------------------------------------*/
  77 static FIELD *Insert_Field_By_Position(FIELD *newfield, FIELD *head)
  78 {
  79   FIELD *current, *newhead;
  80
  81   assert(newfield);
  82
  83   if (!head)
  84     { /* empty list is trivial */
  85       newhead = newfield->snext = newfield->sprev = newfield;
  86     }
  87   else
  88     {
  89       newhead = current = head;
  90       while((current->frow < newfield->frow) ||
  91             ((current->frow==newfield->frow) &&
  92              (current->fcol < newfield->fcol)) )
  93         {
  94           current = current->snext;
  95           if (current==head)
  96             { /* We cycled through. Reset head to indicate that */
  97               head = (FIELD *)0;
  98               break;
  99             }
 100         }
 101       /* we leave the loop with current pointing to the field after newfield*/
 102       newfield->snext    = current;
 103       newfield->sprev    = current->sprev;
 104       newfield->snext->sprev = newfield;
 105       newfield->sprev->snext = newfield;
 106       if (current==head)
 107         newhead = newfield;
 108     }
 109   return(newhead);
 110 }
 111
 112 /*---------------------------------------------------------------------------
 113 |   Facility      :  libnform
 114 |   Function      :  static void Disconnect_Fields(FORM *form)
 115 |
 116 |   Description   :  Break association between form and array of fields.
 117 |
 118 |   Return Values :  -
 119 +--------------------------------------------------------------------------*/
 120 static void Disconnect_Fields( FORM * form )
 121 {
 122   if (form->field)
 123     {
 124       FIELD **fields;
 125
 126       for(fields=form->field;*fields;fields++)
 127         {
 128           if (form == (*fields)->form)
 129             (*fields)->form = (FORM *)0;
 130         }
 131
 132       form->rows = form->cols = 0;
 133       form->maxfield = form->maxpage = -1;
 134       form->field = (FIELD **)0;
 135       if (form->page)
 136         free(form->page);
 137       form->page = (_PAGE *)0;
 138     }
 139 }
 140
 141 /*---------------------------------------------------------------------------
 142 |   Facility      :  libnform
 143 |   Function      :  static int Connect_Fields(FORM *form, FIELD **fields)
 144 |
 145 |   Description   :  Set association between form and array of fields.
 146 |
 147 |   Return Values :  E_OK            - no error
 148 |                    E_CONNECTED     - a field is already connected
 149 |                    E_BAD_ARGUMENT  - Invalid form pointer or field array
 150 |                    E_SYSTEM_ERROR  - not enough memory
 151 +--------------------------------------------------------------------------*/
 152 static int Connect_Fields(FORM  * form, FIELD ** fields)
 153 {
 154   int field_cnt, j;
 155   int page_nr;
 156   int maximum_row_in_field, maximum_col_in_field;
 157   _PAGE *pg;
 158
 159   assert(form);
 160
 161   form->field    = fields;
 162   form->maxfield = 0;
 163   form->maxpage  = 0;
 164
 165   if (!fields)
 166     RETURN(E_OK);
 167
 168   page_nr = 0;
 169   /* store formpointer in fields and count pages */
 170   for(field_cnt=0;fields[field_cnt];field_cnt++)
 171     {
 172       if (fields[field_cnt]->form)
 173         RETURN(E_CONNECTED);
 174       if ( field_cnt==0 ||
 175           (fields[field_cnt]->status & _NEWPAGE))
 176         page_nr++;
 177       fields[field_cnt]->form = form;
 178     }
 179   if (field_cnt==0)
 180     RETURN(E_BAD_ARGUMENT);
 181
 182   /* allocate page structures */
 183   if ( (pg = (_PAGE *)malloc(page_nr * sizeof(_PAGE))) != (_PAGE *)0 )
 184     {
 185       form->page = pg;
 186     }
 187   else
 188     RETURN(E_SYSTEM_ERROR);
 189
 190   /* Cycle through fields and calculate page boundaries as well as
 191      size of the form */
 192   for(j=0;j<field_cnt;j++)
 193     {
 194       if (j==0)
 195         pg->pmin = j;
 196       else
 197         {
 198           if (fields[j]->status & _NEWPAGE)
 199             {
 200               pg->pmax = j-1;
 201               pg++;
 202               pg->pmin = j;
 203             }
 204         }
 205
 206       maximum_row_in_field = fields[j]->frow + fields[j]->rows;
 207       maximum_col_in_field = fields[j]->fcol + fields[j]->cols;
 208
 209       if (form->rows < maximum_row_in_field)
 210         form->rows = maximum_row_in_field;
 211       if (form->cols < maximum_col_in_field)
 212         form->cols = maximum_col_in_field;
 213     }
 214
 215   pg->pmax       = field_cnt-1;
 216   form->maxfield = field_cnt;
 217   form->maxpage  = page_nr;
 218
 219   /* Sort fields on form pages */
 220   for(page_nr = 0;page_nr < form->maxpage; page_nr++)
 221     {
 222       FIELD *fld = (FIELD *)0;
 223       for(j = form->page[page_nr].pmin;j <= form->page[page_nr].pmax;j++)
 224         {
 225           fields[j]->index = j;
 226           fields[j]->page  = page_nr;
 227           fld = Insert_Field_By_Position(fields[j],fld);
 228         }
 229       form->page[page_nr].smin = fld->index;
 230       form->page[page_nr].smax = fld->sprev->index;
 231     }
 232   RETURN(E_OK);
 233 }
 234
 235 /*---------------------------------------------------------------------------
 236 |   Facility      :  libnform
 237 |   Function      :  static int Associate_Fields(FORM *form, FIELD **fields)
 238 |
 239 |   Description   :  Set association between form and array of fields.
 240 |                    If there are fields, position to first active field.
 241 |
 242 |   Return Values :  E_OK            - success
 243 |                    any other       - error occurred
 244 +--------------------------------------------------------------------------*/
 245 INLINE static int Associate_Fields(FORM  *form, FIELD **fields)
 246 {
 247   int res = Connect_Fields(form,fields);
 248   if (res == E_OK)
 249     {
 250       if (form->maxpage>0)
 251         {
 252           form->curpage = 0;
 253           form_driver(form,FIRST_ACTIVE_MAGIC);
 254         }
 255       else
 256         {
 257           form->curpage = -1;
 258           form->current = (FIELD *)0;
 259         }
 260     }
 261   return(res);
 262 }
 263
 264 /*---------------------------------------------------------------------------
 265 |   Facility      :  libnform
 266 |   Function      :  FORM *new_form( FIELD **fields )
 267 |
 268 |   Description   :  Create new form with given array of fields.
 269 |
 270 |   Return Values :  Pointer to form. NULL if error occurred.
 271 +--------------------------------------------------------------------------*/
 272 NCURSES_EXPORT(FORM *)
 273 new_form (FIELD ** fields)
 274 {
 275   int err = E_SYSTEM_ERROR;
 276
 277   FORM *form = (FORM *)malloc(sizeof(FORM));
 278
 279   if (form)
 280     {
 281       *form = *_nc_Default_Form;
 282       if ((err=Associate_Fields(form,fields))!=E_OK)
 283         {
 284           free_form(form);
 285           form = (FORM *)0;
 286         }
 287     }
 288
 289   if (!form)
 290     SET_ERROR(err);
 291
 292   return(form);
 293 }
 294
 295 /*---------------------------------------------------------------------------
 296 |   Facility      :  libnform
 297 |   Function      :  int free_form( FORM *form )
 298 |
 299 |   Description   :  Release internal memory associated with form.
 300 |
 301 |   Return Values :  E_OK           - no error
 302 |                    E_BAD_ARGUMENT - invalid form pointer
 303 |                    E_POSTED       - form is posted
 304 +--------------------------------------------------------------------------*/
 305 NCURSES_EXPORT(int)
 306 free_form (FORM * form)
 307 {
 308   if ( !form )
 309     RETURN(E_BAD_ARGUMENT);
 310
 311   if ( form->status & _POSTED)
 312     RETURN(E_POSTED);
 313
 314   Disconnect_Fields( form );
 315   if (form->page)
 316     free(form->page);
 317   free(form);
 318
 319   RETURN(E_OK);
 320 }
 321
 322 /*---------------------------------------------------------------------------
 323 |   Facility      :  libnform
 324 |   Function      :  int set_form_fields( FORM *form, FIELD **fields )
 325 |
 326 |   Description   :  Set a new association of an array of fields to a form
 327 |
 328 |   Return Values :  E_OK              - no error
 329 |                    E_BAD_ARGUMENT    - invalid form pointer
 330 |                    E_POSTED          - form is posted
 331 +--------------------------------------------------------------------------*/
 332 NCURSES_EXPORT(int)
 333 set_form_fields (FORM  * form, FIELD ** fields)
 334 {
 335   FIELD **old;
 336   int res;
 337
 338   if ( !form )
 339     RETURN(E_BAD_ARGUMENT);
 340
 341   if ( form->status & _POSTED )
 342     RETURN(E_POSTED);
 343
 344   old = form->field;
 345   Disconnect_Fields( form );
 346
 347   if( (res = Associate_Fields( form, fields )) != E_OK )
 348     Connect_Fields( form, old );
 349
 350   RETURN(res);
 351 }
 352
 353 /*---------------------------------------------------------------------------
 354 |   Facility      :  libnform
 355 |   Function      :  FIELD **form_fields( const FORM *form )
 356 |
 357 |   Description   :  Retrieve array of fields
 358 |
 359 |   Return Values :  Pointer to field array
 360 +--------------------------------------------------------------------------*/
 361 NCURSES_EXPORT(FIELD **)
 362 form_fields (const FORM * form)
 363 {
 364   return (Normalize_Form( form )->field);
 365 }
 366
 367 /*---------------------------------------------------------------------------
 368 |   Facility      :  libnform
 369 |   Function      :  int field_count( const FORM *form )
 370 |
 371 |   Description   :  Retrieve number of fields
 372 |
 373 |   Return Values :  Number of fields, -1 if none are defined
 374 +--------------------------------------------------------------------------*/
 375 NCURSES_EXPORT(int)
 376 field_count (const FORM * form)
 377 {
 378   return (Normalize_Form( form )->maxfield);
 379 }
 380
 381 /* frm_def.c ends here */