xref: /freebsd/contrib/ncurses/form/frm_def.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
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3  *                                                                          *
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14  *                                                                          *
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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 1.22 2007/10/13 19:31:17 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 
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 = typeMalloc(_PAGE, page_nr)) != (_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 = typeMalloc(FORM, 1);
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 */
410