1/*	$OpenBSD: fld_link.c,v 1.7 2023/10/17 09:52:10 nicm Exp $	*/
2/****************************************************************************
3 * Copyright 2020,2021 Thomas E. Dickey                                     *
4 * Copyright 1998-2010,2012 Free Software Foundation, Inc.                  *
5 *                                                                          *
6 * Permission is hereby granted, free of charge, to any person obtaining a  *
7 * copy of this software and associated documentation files (the            *
8 * "Software"), to deal in the Software without restriction, including      *
9 * without limitation the rights to use, copy, modify, merge, publish,      *
10 * distribute, distribute with modifications, sublicense, and/or sell       *
11 * copies of the Software, and to permit persons to whom the Software is    *
12 * furnished to do so, subject to the following conditions:                 *
13 *                                                                          *
14 * The above copyright notice and this permission notice shall be included  *
15 * in all copies or substantial portions of the Software.                   *
16 *                                                                          *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
20 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
23 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
24 *                                                                          *
25 * Except as contained in this notice, the name(s) of the above copyright   *
26 * holders shall not be used in advertising or otherwise to promote the     *
27 * sale, use or other dealings in this Software without prior written       *
28 * authorization.                                                           *
29 ****************************************************************************/
30
31/****************************************************************************
32 *   Author:  Juergen Pfeifer, 1995,1997                                    *
33 ****************************************************************************/
34
35#include "form.priv.h"
36
37MODULE_ID("$Id: fld_link.c,v 1.7 2023/10/17 09:52:10 nicm Exp $")
38
39/*---------------------------------------------------------------------------
40|   Facility      :  libnform
41|   Function      :  FIELD *link_field(FIELD *field, int frow, int fcol)
42|
43|   Description   :  Duplicates the field at the specified position. The
44|                    new field shares its buffers with the original one,
45|                    the attributes are independent.
46|                    If an error occurs, errno is set to
47|
48|                    E_BAD_ARGUMENT - invalid argument
49|                    E_SYSTEM_ERROR - system error
50|
51|   Return Values :  Pointer to the new field or NULL if failure
52+--------------------------------------------------------------------------*/
53FORM_EXPORT(FIELD *)
54link_field(FIELD *field, int frow, int fcol)
55{
56  FIELD *New_Field = (FIELD *)0;
57  int err = E_BAD_ARGUMENT;
58
59  T((T_CALLED("link_field(%p,%d,%d)"), (void *)field, frow, fcol));
60  if (field && (frow >= 0) && (fcol >= 0) &&
61      ((err = E_SYSTEM_ERROR) != 0) &&	/* trick: this resets the default error */
62      (New_Field = typeMalloc(FIELD, 1)))
63    {
64      T((T_CREATE("field %p"), (void *)New_Field));
65      *New_Field = *_nc_Default_Field;
66      New_Field->frow = (short)frow;
67      New_Field->fcol = (short)fcol;
68
69      New_Field->link = field->link;
70      field->link = New_Field;
71
72      New_Field->buf = field->buf;
73      New_Field->rows = field->rows;
74      New_Field->cols = field->cols;
75      New_Field->nrow = field->nrow;
76      New_Field->nbuf = field->nbuf;
77      New_Field->drows = field->drows;
78      New_Field->dcols = field->dcols;
79      New_Field->maxgrow = field->maxgrow;
80      New_Field->just = field->just;
81      New_Field->fore = field->fore;
82      New_Field->back = field->back;
83      New_Field->pad = field->pad;
84      New_Field->opts = field->opts;
85      New_Field->usrptr = field->usrptr;
86
87      if (_nc_Copy_Type(New_Field, field))
88	returnField(New_Field);
89    }
90
91  if (New_Field)
92    free_field(New_Field);
93
94  SET_ERROR(err);
95  returnField((FIELD *)0);
96}
97
98/* fld_link.c ends here */
99