Source/CursesDialog/form/fld_def.c

   1 /****************************************************************************
   2  * Copyright (c) 1998 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 <juergen.pfeifer@gmx.net> 1995,1997            *
  31  ****************************************************************************/
  32
  33 #include "form.priv.h"
  34
  35 MODULE_ID("$Id: fld_def.c,v 1.2 2002-01-25 14:06:38 king Exp $")
  36
  37 /* this can't be readonly */
  38 static FIELD default_field = {
  39   0,                       /* status */
  40   0,                       /* rows   */
  41   0,                       /* cols   */
  42   0,                       /* frow   */
  43   0,                       /* fcol   */
  44   0,                       /* drows  */
  45   0,                       /* dcols  */
  46   0,                       /* maxgrow*/
  47   0,                       /* nrow   */
  48   0,                       /* nbuf   */
  49   NO_JUSTIFICATION,        /* just   */
  50   0,                       /* page   */
  51   0,                       /* index  */
  52   (int)' ',                /* pad    */
  53   A_NORMAL,                /* fore   */
  54   A_NORMAL,                /* back   */
  55   ALL_FIELD_OPTS,          /* opts   */
  56   (FIELD *)0,              /* snext  */
  57   (FIELD *)0,              /* sprev  */
  58   (FIELD *)0,              /* link   */
  59   (FORM *)0,               /* form   */
  60   (FIELDTYPE *)0,          /* type   */
  61   (char *)0,               /* arg    */
  62   (char *)0,               /* buf    */
  63   (char *)0                /* usrptr */
  64 };
  65
  66 FIELD *_nc_Default_Field = &default_field;
  67 \f
  68 /*---------------------------------------------------------------------------
  69 |   Facility      :  libnform
  70 |   Function      :  TypeArgument *_nc_Make_Argument(
  71 |                              const FIELDTYPE *typ,
  72 |                              va_list *ap,
  73 |                              int *err )
  74 |
  75 |   Description   :  Create an argument structure for the specified type.
  76 |                    Use the type-dependant argument list to construct
  77 |                    it.
  78 |
  79 |   Return Values :  Pointer to argument structure. Maybe NULL.
  80 |                    In case of an error in *err an errorcounter is increased.
  81 +--------------------------------------------------------------------------*/
  82 TypeArgument*
  83 _nc_Make_Argument(const FIELDTYPE *typ, va_list *ap, int *err)
  84 {
  85   TypeArgument *res = (TypeArgument *)0;
  86   TypeArgument *p;
  87
  88   if (typ && (typ->status & _HAS_ARGS))
  89     {
  90       assert(err && ap);
  91       if (typ->status & _LINKED_TYPE)
  92         {
  93           p = (TypeArgument *)malloc(sizeof(TypeArgument));
  94           if (p)
  95             {
  96               p->left  = _nc_Make_Argument(typ->left ,ap,err);
  97               p->right = _nc_Make_Argument(typ->right,ap,err);
  98               return p;
  99             }
 100           else
 101             *err += 1;
 102       } else
 103         {
 104           assert(typ->makearg != 0);
 105           if ( !(res=(TypeArgument *)typ->makearg(ap)) )
 106             *err += 1;
 107         }
 108     }
 109   return res;
 110 }
 111
 112 /*---------------------------------------------------------------------------
 113 |   Facility      :  libnform
 114 |   Function      :  TypeArgument *_nc_Copy_Argument(const FIELDTYPE *typ,
 115 |                                                    const TypeArgument *argp,
 116 |                                                    int *err )
 117 |
 118 |   Description   :  Create a copy of an argument structure for the specified
 119 |                    type.
 120 |
 121 |   Return Values :  Pointer to argument structure. Maybe NULL.
 122 |                    In case of an error in *err an errorcounter is increased.
 123 +--------------------------------------------------------------------------*/
 124 TypeArgument*
 125 _nc_Copy_Argument(const FIELDTYPE *typ,
 126                   const TypeArgument *argp, int *err)
 127 {
 128   TypeArgument *res = (TypeArgument *)0;
 129   TypeArgument *p;
 130
 131   if ( typ && (typ->status & _HAS_ARGS) )
 132     {
 133       assert(err && argp);
 134       if (typ->status & _LINKED_TYPE)
 135         {
 136           p = (TypeArgument *)malloc(sizeof(TypeArgument));
 137           if (p)
 138             {
 139               p->left  = _nc_Copy_Argument(typ,argp->left ,err);
 140               p->right = _nc_Copy_Argument(typ,argp->right,err);
 141               return p;
 142             }
 143           *err += 1;
 144       }
 145       else
 146         {
 147           if (typ->copyarg)
 148             {
 149               if (!(res = (TypeArgument *)(typ->copyarg((const void *)argp))))
 150                 *err += 1;
 151             }
 152           else
 153             res = (TypeArgument *)argp;
 154         }
 155     }
 156   return res;
 157 }
 158
 159 /*---------------------------------------------------------------------------
 160 |   Facility      :  libnform
 161 |   Function      :  void _nc_Free_Argument(const FIELDTYPE *typ,
 162 |                                           TypeArgument * argp )
 163 |
 164 |   Description   :  Release memory associated with the argument structure
 165 |                    for the given fieldtype.
 166 |
 167 |   Return Values :  -
 168 +--------------------------------------------------------------------------*/
 169 void
 170 _nc_Free_Argument(const FIELDTYPE * typ, TypeArgument * argp)
 171 {
 172   if (!typ || !(typ->status & _HAS_ARGS))
 173     return;
 174
 175   if (typ->status & _LINKED_TYPE)
 176     {
 177       assert(argp != 0);
 178       _nc_Free_Argument(typ->left ,argp->left );
 179       _nc_Free_Argument(typ->right,argp->right);
 180       free(argp);
 181     }
 182   else
 183     {
 184       if (typ->freearg)
 185         typ->freearg((void *)argp);
 186     }
 187 }
 188
 189 /*---------------------------------------------------------------------------
 190 |   Facility      :  libnform
 191 |   Function      :  bool _nc_Copy_Type( FIELD *dst, FIELD const *src )
 192 |
 193 |   Description   :  Copy argument structure of field src to field dst
 194 |
 195 |   Return Values :  TRUE       - copy worked
 196 |                    FALSE      - error occured
 197 +--------------------------------------------------------------------------*/
 198 bool
 199 _nc_Copy_Type(FIELD *dst, FIELD const *src)
 200 {
 201   int err = 0;
 202
 203   assert(dst && src);
 204
 205   dst->type = src->type;
 206   dst->arg  = (void *)_nc_Copy_Argument(src->type,(TypeArgument *)(src->arg),&err);
 207
 208   if (err)
 209     {
 210       _nc_Free_Argument(dst->type,(TypeArgument *)(dst->arg));
 211       dst->type = (FIELDTYPE *)0;
 212       dst->arg  = (void *)0;
 213       return FALSE;
 214     }
 215   else
 216     {
 217       if (dst->type)
 218         dst->type->ref++;
 219       return TRUE;
 220     }
 221 }
 222
 223 /*---------------------------------------------------------------------------
 224 |   Facility      :  libnform
 225 |   Function      :  void _nc_Free_Type( FIELD *field )
 226 |
 227 |   Description   :  Release Argument structure for this field
 228 |
 229 |   Return Values :  -
 230 +--------------------------------------------------------------------------*/
 231 void
 232 _nc_Free_Type(FIELD *field)
 233 {
 234   assert(field != 0);
 235   if (field->type)
 236     field->type->ref--;
 237   _nc_Free_Argument(field->type,(TypeArgument *)(field->arg));
 238 }
 239
 240 /*---------------------------------------------------------------------------
 241 |   Facility      :  libnform
 242 |   Function      :  FIELD *new_field( int rows, int cols,
 243 |                                      int frow, int fcol,
 244 |                                      int nrow, int nbuf )
 245 |
 246 |   Description   :  Create a new field with this many 'rows' and 'cols',
 247 |                    starting at 'frow/fcol' in the subwindow of the form.
 248 |                    Allocate 'nrow' off-screen rows and 'nbuf' additional
 249 |                    buffers. If an error occurs, errno is set to
 250 |
 251 |                    E_BAD_ARGUMENT - invalid argument
 252 |                    E_SYSTEM_ERROR - system error
 253 |
 254 |   Return Values :  Pointer to the new field or NULL if failure.
 255 +--------------------------------------------------------------------------*/
 256 FIELD *new_field(int rows, int cols, int frow, int fcol, int nrow, int nbuf)
 257 {
 258   FIELD *New_Field = (FIELD *)0;
 259   int err = E_BAD_ARGUMENT;
 260
 261   if (rows>0  &&
 262       cols>0  &&
 263       frow>=0 &&
 264       fcol>=0 &&
 265       nrow>=0 &&
 266       nbuf>=0 &&
 267       ((err = E_SYSTEM_ERROR) != 0) && /* trick: this resets the default error */
 268       (New_Field=(FIELD *)malloc(sizeof(FIELD))) )
 269     {
 270       *New_Field       = default_field;
 271       New_Field->rows  = rows;
 272       New_Field->cols  = cols;
 273       New_Field->drows = rows + nrow;
 274       New_Field->dcols = cols;
 275       New_Field->frow  = frow;
 276       New_Field->fcol  = fcol;
 277       New_Field->nrow  = nrow;
 278       New_Field->nbuf  = nbuf;
 279       New_Field->link  = New_Field;
 280
 281       if (_nc_Copy_Type(New_Field,&default_field))
 282         {
 283           size_t len;
 284
 285           len = Total_Buffer_Size(New_Field);
 286           if ((New_Field->buf = (char *)malloc(len)))
 287             {
 288               /* Prefill buffers with blanks and insert terminating zeroes
 289                  between buffers */
 290               int i;
 291
 292               memset(New_Field->buf,' ',len);
 293               for(i=0;i<=New_Field->nbuf;i++)
 294                 {
 295                   New_Field->buf[(New_Field->drows*New_Field->cols+1)*(i+1)-1]
 296                     = '\0';
 297                 }
 298               return New_Field;
 299             }
 300         }
 301     }
 302
 303   if (New_Field)
 304     free_field(New_Field);
 305
 306   SET_ERROR( err );
 307   return (FIELD *)0;
 308 }
 309
 310 /*---------------------------------------------------------------------------
 311 |   Facility      :  libnform
 312 |   Function      :  int free_field( FIELD *field )
 313 |
 314 |   Description   :  Frees the storage allocated for the field.
 315 |
 316 |   Return Values :  E_OK           - success
 317 |                    E_BAD_ARGUMENT - invalid field pointer
 318 |                    E_CONNECTED    - field is connected
 319 +--------------------------------------------------------------------------*/
 320 int free_field(FIELD * field)
 321 {
 322   if (!field)
 323     RETURN(E_BAD_ARGUMENT);
 324
 325   if (field->form)
 326     RETURN(E_CONNECTED);
 327
 328   if (field == field->link)
 329     {
 330       if (field->buf)
 331         free(field->buf);
 332     }
 333   else
 334     {
 335       FIELD *f;
 336
 337       for(f=field;f->link != field;f = f->link)
 338         {}
 339       f->link = field->link;
 340     }
 341   _nc_Free_Type(field);
 342   free(field);
 343   RETURN(E_OK);
 344 }
 345
 346 /* fld_def.c ends here */