contrib/ncurses/form/fld_link.c

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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 1.13 2012/03/11 00:37:16 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   T((T_CALLED("link_field(%p,%d,%d)"), (void *)field, frow, fcol));
  58   if (field && (frow >= 0) && (fcol >= 0) &&
  59       ((err = E_SYSTEM_ERROR) != 0) &&  /* trick: this resets the default error */
  60       (New_Field = typeMalloc(FIELD, 1)))
  61     {
  62       T((T_CREATE("field %p"), (void *)New_Field));
  63       *New_Field = *_nc_Default_Field;
  64       New_Field->frow = (short) frow;
  65       New_Field->fcol = (short) fcol;
  66
  67       New_Field->link = field->link;
  68       field->link = New_Field;
  69
  70       New_Field->buf = field->buf;
  71       New_Field->rows = field->rows;
  72       New_Field->cols = field->cols;
  73       New_Field->nrow = field->nrow;
  74       New_Field->nbuf = field->nbuf;
  75       New_Field->drows = field->drows;
  76       New_Field->dcols = field->dcols;
  77       New_Field->maxgrow = field->maxgrow;
  78       New_Field->just = field->just;
  79       New_Field->fore = field->fore;
  80       New_Field->back = field->back;
  81       New_Field->pad = field->pad;
  82       New_Field->opts = field->opts;
  83       New_Field->usrptr = field->usrptr;
  84
  85       if (_nc_Copy_Type(New_Field, field))
  86         returnField(New_Field);
  87     }
  88
  89   if (New_Field)
  90     free_field(New_Field);
  91
  92   SET_ERROR(err);
  93   returnField((FIELD *)0);
  94 }
  95
  96 /* fld_link.c ends here */