1/****************************************************************************
2 * Copyright 2020,2021 Thomas E. Dickey                                     *
3 * Copyright 1998-2010,2012 Free Software Foundation, Inc.                  *
4 *                                                                          *
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10 * copies of the Software, and to permit persons to whom the Software is    *
11 * furnished to do so, subject to the following conditions:                 *
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14 * in all copies or substantial portions of the Software.                   *
15 *                                                                          *
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29
30/****************************************************************************
31 *   Author:  Juergen Pfeifer, 1995,1997                                    *
32 ****************************************************************************/
33
34#include "form.priv.h"
35
36MODULE_ID("$Id: fld_link.c,v 1.17 2021/06/17 21:20:30 tom Exp $")
37
38/*---------------------------------------------------------------------------
39|   Facility      :  libnform
40|   Function      :  FIELD *link_field(FIELD *field, int frow, int fcol)
41|
42|   Description   :  Duplicates the field at the specified position. The
43|                    new field shares its buffers with the original one,
44|                    the attributes are independent.
45|                    If an error occurs, errno is set to
46|
47|                    E_BAD_ARGUMENT - invalid argument
48|                    E_SYSTEM_ERROR - system error
49|
50|   Return Values :  Pointer to the new field or NULL if failure
51+--------------------------------------------------------------------------*/
52FORM_EXPORT(FIELD *)
53link_field(FIELD *field, int frow, int fcol)
54{
55  FIELD *New_Field = (FIELD *)0;
56  int err = E_BAD_ARGUMENT;
57
58  T((T_CALLED("link_field(%p,%d,%d)"), (void *)field, frow, fcol));
59  if (field && (frow >= 0) && (fcol >= 0) &&
60      ((err = E_SYSTEM_ERROR) != 0) &&	/* trick: this resets the default error */
61      (New_Field = typeMalloc(FIELD, 1)))
62    {
63      T((T_CREATE("field %p"), (void *)New_Field));
64      *New_Field = *_nc_Default_Field;
65      New_Field->frow = (short)frow;
66      New_Field->fcol = (short)fcol;
67
68      New_Field->link = field->link;
69      field->link = New_Field;
70
71      New_Field->buf = field->buf;
72      New_Field->rows = field->rows;
73      New_Field->cols = field->cols;
74      New_Field->nrow = field->nrow;
75      New_Field->nbuf = field->nbuf;
76      New_Field->drows = field->drows;
77      New_Field->dcols = field->dcols;
78      New_Field->maxgrow = field->maxgrow;
79      New_Field->just = field->just;
80      New_Field->fore = field->fore;
81      New_Field->back = field->back;
82      New_Field->pad = field->pad;
83      New_Field->opts = field->opts;
84      New_Field->usrptr = field->usrptr;
85
86      if (_nc_Copy_Type(New_Field, field))
87	returnField(New_Field);
88    }
89
90  if (New_Field)
91    free_field(New_Field);
92
93  SET_ERROR(err);
94  returnField((FIELD *)0);
95}
96
97/* fld_link.c ends here */
98