form/fld_dup.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2004,2007 Free Software Foundation, Inc.              *
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  14  *                                                                          *
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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_dup.c,v 1.12 2007/10/13 19:30:21 tom Exp $")
  36
  37 /*---------------------------------------------------------------------------
  38 |   Facility      :  libnform
  39 |   Function      :  FIELD *dup_field(FIELD *field, int frow, int fcol)
  40 |
  41 |   Description   :  Duplicates the field at the specified position. All
  42 |                    field attributes and the buffers are copied.
  43 |                    If an error occurs, errno is set to
  44 |
  45 |                    E_BAD_ARGUMENT - invalid argument
  46 |                    E_SYSTEM_ERROR - system error
  47 |
  48 |   Return Values :  Pointer to the new field or NULL if failure
  49 +--------------------------------------------------------------------------*/
  50 NCURSES_EXPORT(FIELD *)
  51 dup_field(FIELD *field, int frow, int fcol)
  52 {
  53   FIELD *New_Field = (FIELD *)0;
  54   int err = E_BAD_ARGUMENT;
  55
  56   T((T_CALLED("dup_field(%p,%d,%d)"), field, frow, fcol));
  57   if (field && (frow >= 0) && (fcol >= 0) &&
  58       ((err = E_SYSTEM_ERROR) != 0) &&  /* trick : this resets the default error */
  59       (New_Field = typeMalloc(FIELD, 1)))
  60     {
  61       T((T_CREATE("field %p"), New_Field));
  62       *New_Field = *_nc_Default_Field;
  63       New_Field->frow = frow;
  64       New_Field->fcol = fcol;
  65       New_Field->link = New_Field;
  66       New_Field->rows = field->rows;
  67       New_Field->cols = field->cols;
  68       New_Field->nrow = field->nrow;
  69       New_Field->drows = field->drows;
  70       New_Field->dcols = field->dcols;
  71       New_Field->maxgrow = field->maxgrow;
  72       New_Field->nbuf = field->nbuf;
  73       New_Field->just = field->just;
  74       New_Field->fore = field->fore;
  75       New_Field->back = field->back;
  76       New_Field->pad = field->pad;
  77       New_Field->opts = field->opts;
  78       New_Field->usrptr = field->usrptr;
  79
  80       if (_nc_Copy_Type(New_Field, field))
  81         {
  82           size_t i, len;
  83
  84           len = Total_Buffer_Size(New_Field);
  85           if ((New_Field->buf = (FIELD_CELL *)malloc(len)))
  86             {
  87               for (i = 0; i < len; ++i)
  88                 New_Field->buf[i] = field->buf[i];
  89               returnField(New_Field);
  90             }
  91         }
  92     }
  93
  94   if (New_Field)
  95     free_field(New_Field);
  96
  97   SET_ERROR(err);
  98   returnField((FIELD *)0);
  99 }
 100
 101 /* fld_dup.c ends here */