1 /****************************************************************************
2 * Copyright (c) 1998-2002,2003 Free Software Foundation, Inc. *
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5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
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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: *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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23 * Except as contained in this notice, the name(s) of the above copyright *
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27 ****************************************************************************/
29 /****************************************************************************
30 * Author: Juergen Pfeifer, 1995,1997 *
31 ****************************************************************************/
33 #include "form.priv.h"
35 MODULE_ID("$Id: fld_def.c,v 1.17 2003/11/08 21:15:02 Jonathon.Gray Exp $")
37 /* this can't be readonly */
38 static FIELD default_field = {
49 NO_JUSTIFICATION, /* just */
55 ALL_FIELD_OPTS, /* opts */
56 (FIELD *)0, /* snext */
57 (FIELD *)0, /* sprev */
58 (FIELD *)0, /* link */
60 (FIELDTYPE *)0, /* type */
63 (char *)0 /* usrptr */
66 NCURSES_EXPORT_VAR(FIELD *) _nc_Default_Field = &default_field;
68 /*---------------------------------------------------------------------------
70 | Function : TypeArgument *_nc_Make_Argument(
71 | const FIELDTYPE *typ,
75 | Description : Create an argument structure for the specified type.
76 | Use the type-dependent argument list to construct
79 | Return Values : Pointer to argument structure. Maybe NULL.
80 | In case of an error in *err an error counter is increased.
81 +--------------------------------------------------------------------------*/
82 NCURSES_EXPORT(TypeArgument*)
84 (const FIELDTYPE *typ, va_list *ap, int *err)
86 TypeArgument *res = (TypeArgument *)0;
89 if (typ && (typ->status & _HAS_ARGS))
92 if (typ->status & _LINKED_TYPE)
94 p = (TypeArgument *)malloc(sizeof(TypeArgument));
97 p->left = _nc_Make_Argument(typ->left ,ap,err);
98 p->right = _nc_Make_Argument(typ->right,ap,err);
105 assert(typ->makearg);
106 if ( !(res=(TypeArgument *)typ->makearg(ap)) )
113 /*---------------------------------------------------------------------------
114 | Facility : libnform
115 | Function : TypeArgument *_nc_Copy_Argument(const FIELDTYPE *typ,
116 | const TypeArgument *argp,
119 | Description : Create a copy of an argument structure for the specified
122 | Return Values : Pointer to argument structure. Maybe NULL.
123 | In case of an error in *err an error counter is increased.
124 +--------------------------------------------------------------------------*/
125 NCURSES_EXPORT(TypeArgument*)
127 (const FIELDTYPE *typ,
128 const TypeArgument *argp, int *err)
130 TypeArgument *res = (TypeArgument *)0;
133 if ( typ && (typ->status & _HAS_ARGS) )
136 if (typ->status & _LINKED_TYPE)
138 p = (TypeArgument *)malloc(sizeof(TypeArgument));
141 p->left = _nc_Copy_Argument(typ,argp->left ,err);
142 p->right = _nc_Copy_Argument(typ,argp->right,err);
151 if (!(res = (TypeArgument *)(typ->copyarg((const void *)argp))))
155 res = (TypeArgument *)argp;
161 /*---------------------------------------------------------------------------
162 | Facility : libnform
163 | Function : void _nc_Free_Argument(const FIELDTYPE *typ,
164 | TypeArgument * argp )
166 | Description : Release memory associated with the argument structure
167 | for the given fieldtype.
170 +--------------------------------------------------------------------------*/
173 (const FIELDTYPE * typ, TypeArgument * argp)
175 if (!typ || !(typ->status & _HAS_ARGS))
178 if (typ->status & _LINKED_TYPE)
181 _nc_Free_Argument(typ->left ,argp->left );
182 _nc_Free_Argument(typ->right,argp->right);
188 typ->freearg((void *)argp);
192 /*---------------------------------------------------------------------------
193 | Facility : libnform
194 | Function : bool _nc_Copy_Type( FIELD *dst, FIELD const *src )
196 | Description : Copy argument structure of field src to field dst
198 | Return Values : TRUE - copy worked
199 | FALSE - error occurred
200 +--------------------------------------------------------------------------*/
203 (FIELD *dst, FIELD const *src)
209 dst->type = src->type;
210 dst->arg = (void *)_nc_Copy_Argument(src->type,(TypeArgument *)(src->arg),&err);
214 _nc_Free_Argument(dst->type,(TypeArgument *)(dst->arg));
215 dst->type = (FIELDTYPE *)0;
216 dst->arg = (void *)0;
227 /*---------------------------------------------------------------------------
228 | Facility : libnform
229 | Function : void _nc_Free_Type( FIELD *field )
231 | Description : Release Argument structure for this field
234 +--------------------------------------------------------------------------*/
236 _nc_Free_Type (FIELD *field)
241 _nc_Free_Argument(field->type,(TypeArgument *)(field->arg));
244 /*---------------------------------------------------------------------------
245 | Facility : libnform
246 | Function : FIELD *new_field( int rows, int cols,
247 | int frow, int fcol,
248 | int nrow, int nbuf )
250 | Description : Create a new field with this many 'rows' and 'cols',
251 | starting at 'frow/fcol' in the subwindow of the form.
252 | Allocate 'nrow' off-screen rows and 'nbuf' additional
253 | buffers. If an error occurs, errno is set to
255 | E_BAD_ARGUMENT - invalid argument
256 | E_SYSTEM_ERROR - system error
258 | Return Values : Pointer to the new field or NULL if failure.
259 +--------------------------------------------------------------------------*/
260 NCURSES_EXPORT(FIELD *)
262 (int rows, int cols, int frow, int fcol, int nrow, int nbuf)
264 FIELD *New_Field = (FIELD *)0;
265 int err = E_BAD_ARGUMENT;
273 ((err = E_SYSTEM_ERROR) != 0) && /* trick: this resets the default error */
274 (New_Field=(FIELD *)malloc(sizeof(FIELD))) )
276 *New_Field = default_field;
277 New_Field->rows = rows;
278 New_Field->cols = cols;
279 New_Field->drows = rows + nrow;
280 New_Field->dcols = cols;
281 New_Field->frow = frow;
282 New_Field->fcol = fcol;
283 New_Field->nrow = nrow;
284 New_Field->nbuf = nbuf;
285 New_Field->link = New_Field;
287 if (_nc_Copy_Type(New_Field,&default_field))
291 len = Total_Buffer_Size(New_Field);
292 if ((New_Field->buf = (char *)malloc(len)))
294 /* Prefill buffers with blanks and insert terminating zeroes
298 memset(New_Field->buf,' ',len);
299 for(i=0;i<=New_Field->nbuf;i++)
301 New_Field->buf[(New_Field->drows*New_Field->cols+1)*(i+1)-1]
310 free_field(New_Field);
316 /*---------------------------------------------------------------------------
317 | Facility : libnform
318 | Function : int free_field( FIELD *field )
320 | Description : Frees the storage allocated for the field.
322 | Return Values : E_OK - success
323 | E_BAD_ARGUMENT - invalid field pointer
324 | E_CONNECTED - field is connected
325 +--------------------------------------------------------------------------*/
327 free_field (FIELD * field)
330 RETURN(E_BAD_ARGUMENT);
335 if (field == field->link)
344 for(f=field;f->link != field;f = f->link)
346 f->link = field->link;
348 _nc_Free_Type(field);
353 /* fld_def.c ends here */