contrib/ncurses-5.4/form/fld_link.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2002,2003 Free Software Foundation, Inc.              *
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  28
  29 /****************************************************************************
  30  *   Author:  Juergen Pfeifer, 1995,1997                                    *
  31  ****************************************************************************/
  32
  33 #include "form.priv.h"
  34
  35 MODULE_ID("$Id: fld_link.c,v 1.7 2003/10/25 15:17:08 tom Exp $")
  36
  37 /*---------------------------------------------------------------------------
  38 |   Facility      :  libnform
  39 |   Function      :  FIELD *link_field(FIELD *field, int frow, int fcol)
  40 |
  41 |   Description   :  Duplicates the field at the specified position. The
  42 |                    new field shares its buffers with the original one,
  43 |                    the attributes are independent.
  44 |                    If an error occurs, errno is set to
  45 |
  46 |                    E_BAD_ARGUMENT - invalid argument
  47 |                    E_SYSTEM_ERROR - system error
  48 |
  49 |   Return Values :  Pointer to the new field or NULL if failure
  50 +--------------------------------------------------------------------------*/
  51 NCURSES_EXPORT(FIELD *)
  52 link_field (FIELD * field, int frow, int fcol)
  53 {
  54   FIELD *New_Field = (FIELD *)0;
  55   int err = E_BAD_ARGUMENT;
  56
  57   if (field && (frow>=0) && (fcol>=0) &&
  58       ((err=E_SYSTEM_ERROR) != 0) && /* trick: this resets the default error */
  59       (New_Field = (FIELD *)malloc(sizeof(FIELD))) )
  60     {
  61       *New_Field        = *_nc_Default_Field;
  62       New_Field->frow   = frow;
  63       New_Field->fcol   = fcol;
  64       New_Field->link   = field->link;
  65       field->link       = New_Field;
  66       New_Field->buf    = field->buf;
  67       New_Field->rows   = field->rows;
  68       New_Field->cols   = field->cols;
  69       New_Field->nrow   = field->nrow;
  70       New_Field->nbuf   = field->nbuf;
  71       New_Field->drows  = field->drows;
  72       New_Field->dcols  = field->dcols;
  73       New_Field->maxgrow= field->maxgrow;
  74       New_Field->just   = field->just;
  75       New_Field->fore   = field->fore;
  76       New_Field->back   = field->back;
  77       New_Field->pad    = field->pad;
  78       New_Field->opts   = field->opts;
  79       New_Field->usrptr = field->usrptr;
  80       if (_nc_Copy_Type(New_Field,field))
  81         return New_Field;
  82     }
  83
  84   if (New_Field)
  85     free_field(New_Field);
  86
  87   SET_ERROR( err );
  88   return (FIELD *)0;
  89 }
  90
  91 /* fld_link.c ends here */