form/fld_link.c

   1 /****************************************************************************
   2  * Copyright 2020 Thomas E. Dickey                                          *
   3  * Copyright 1998-2010,2012 Free Software Foundation, Inc.                  *
   4  *                                                                          *
   5  * Permission is hereby granted, free of charge, to any person obtaining a  *
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   7  * "Software"), to deal in the Software without restriction, including      *
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   9  * distribute, distribute with modifications, sublicense, and/or sell       *
  10  * copies of the Software, and to permit persons to whom the Software is    *
  11  * furnished to do so, subject to the following conditions:                 *
  12  *                                                                          *
  13  * The above copyright notice and this permission notice shall be included  *
  14  * in all copies or substantial portions of the Software.                   *
  15  *                                                                          *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  19  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
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  22  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
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  24  * Except as contained in this notice, the name(s) of the above copyright   *
  25  * holders shall not be used in advertising or otherwise to promote the     *
  26  * sale, use or other dealings in this Software without prior written       *
  27  * authorization.                                                           *
  28  ****************************************************************************/
  29
  30 /****************************************************************************
  31  *   Author:  Juergen Pfeifer, 1995,1997                                    *
  32  ****************************************************************************/
  33
  34 #include "form.priv.h"
  35
  36 MODULE_ID("$Id: fld_link.c,v 1.16 2020/12/11 23:20:32 tom Exp $")
  37
  38 /*---------------------------------------------------------------------------
  39 |   Facility      :  libnform
  40 |   Function      :  FIELD *link_field(FIELD *field, int frow, int fcol)
  41 |
  42 |   Description   :  Duplicates the field at the specified position. The
  43 |                    new field shares its buffers with the original one,
  44 |                    the attributes are independent.
  45 |                    If an error occurs, errno is set to
  46 |
  47 |                    E_BAD_ARGUMENT - invalid argument
  48 |                    E_SYSTEM_ERROR - system error
  49 |
  50 |   Return Values :  Pointer to the new field or NULL if failure
  51 +--------------------------------------------------------------------------*/
  52 FORM_EXPORT(FIELD *)
  53 link_field(FIELD *field, int frow, int fcol)
  54 {
  55   FIELD *New_Field = (FIELD *)0;
  56   int err = E_BAD_ARGUMENT;
  57
  58   T((T_CALLED("link_field(%p,%d,%d)"), (void *)field, frow, fcol));
  59   if (field && (frow >= 0) && (fcol >= 0) &&
  60       ((err = E_SYSTEM_ERROR) != 0) &&  /* trick: this resets the default error */
  61       (New_Field = typeMalloc(FIELD, 1)))
  62     {
  63       T((T_CREATE("field %p"), (void *)New_Field));
  64       *New_Field = *_nc_Default_Field;
  65       New_Field->frow = (short)frow;
  66       New_Field->fcol = (short)fcol;
  67
  68       New_Field->link = field->link;
  69       field->link = New_Field;
  70
  71       New_Field->buf = field->buf;
  72       New_Field->rows = field->rows;
  73       New_Field->cols = field->cols;
  74       New_Field->nrow = field->nrow;
  75       New_Field->nbuf = field->nbuf;
  76       New_Field->drows = field->drows;
  77       New_Field->dcols = field->dcols;
  78       New_Field->maxgrow = field->maxgrow;
  79       New_Field->just = field->just;
  80       New_Field->fore = field->fore;
  81       New_Field->back = field->back;
  82       New_Field->pad = field->pad;
  83       New_Field->opts = field->opts;
  84       New_Field->usrptr = field->usrptr;
  85
  86       if (_nc_Copy_Type(New_Field, field))
  87         returnField(New_Field);
  88     }
  89
  90   if (New_Field)
  91     free_field(New_Field);
  92
  93   SET_ERROR(err);
  94   returnField((FIELD *)0);
  95 }
  96
  97 /* fld_link.c ends here */