freebsd-dev/contrib/ncurses/form/fld_link.c

/****************************************************************************
 * Copyright (c) 1998,2000 Free Software Foundation, Inc.                   *
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/****************************************************************************
 *   Author: Juergen Pfeifer <juergen.pfeifer@gmx.net> 1995,1997            *
 ****************************************************************************/

#include "form.priv.h"

MODULE_ID("$Id: fld_link.c,v 1.5 2000/12/10 02:09:38 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;

  if (field && (frow>=0) && (fcol>=0) &&
      ((err=E_SYSTEM_ERROR) != 0) && /* trick: this resets the default error */
      (New_Field = (FIELD *)malloc(sizeof(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)) 
	return New_Field;
    }

  if (New_Field) 
    free_field(New_Field);

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

/* fld_link.c ends here */