xref: /freebsd-10.2-release/contrib/ncurses/form/fld_link.c

/****************************************************************************
 * Copyright (c) 1998-2004,2007 Free Software Foundation, Inc.              *
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 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
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 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
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 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
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/****************************************************************************
 *   Author:  Juergen Pfeifer, 1995,1997                                    *
 ****************************************************************************/

#include "form.priv.h"

MODULE_ID("$Id: fld_link.c,v 1.11 2007/10/13 19:30:43 tom Exp $")

/*---------------------------------------------------------------------------
|   Facility      :  libnform
|   Function      :  FIELD *link_field(FIELD *field, int frow, int fcol)
|
|   Description   :  Duplicates the field at the specified position. The
|                    new field shares its buffers with the original one,
|                    the attributes are independent.
|                    If an error occurs, errno is set to
|
|                    E_BAD_ARGUMENT - invalid argument
|                    E_SYSTEM_ERROR - system error
|
|   Return Values :  Pointer to the new field or NULL if failure
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(FIELD *)
link_field(FIELD *field, int frow, int fcol)
{
  FIELD *New_Field = (FIELD *)0;
  int err = E_BAD_ARGUMENT;

  T((T_CALLED("link_field(%p,%d,%d)"), field, frow, fcol));
  if (field && (frow >= 0) && (fcol >= 0) &&
      ((err = E_SYSTEM_ERROR) != 0) &&	/* trick: this resets the default error */
      (New_Field = typeMalloc(FIELD, 1)))
    {
      T((T_CREATE("field %p"), New_Field));
      *New_Field = *_nc_Default_Field;
      New_Field->frow = frow;
      New_Field->fcol = fcol;

      New_Field->link = field->link;
      field->link = New_Field;

      New_Field->buf = field->buf;
      New_Field->rows = field->rows;
      New_Field->cols = field->cols;
      New_Field->nrow = field->nrow;
      New_Field->nbuf = field->nbuf;
      New_Field->drows = field->drows;
      New_Field->dcols = field->dcols;
      New_Field->maxgrow = field->maxgrow;
      New_Field->just = field->just;
      New_Field->fore = field->fore;
      New_Field->back = field->back;
      New_Field->pad = field->pad;
      New_Field->opts = field->opts;
      New_Field->usrptr = field->usrptr;

      if (_nc_Copy_Type(New_Field, field))
	returnField(New_Field);
    }

  if (New_Field)
    free_field(New_Field);

  SET_ERROR(err);
  returnField((FIELD *)0);
}

/* fld_link.c ends here */