ncurses 6.2 - patch 20210501
[ncurses.git] / form / fld_link.c
1 /****************************************************************************
2  * Copyright 2020 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:                 *
12  *                                                                          *
13  * The above copyright notice and this permission notice shall be included  *
14  * in all copies or substantial portions of the Software.                   *
15  *                                                                          *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
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18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
19  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
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22  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
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25  * holders shall not be used in advertising or otherwise to promote the     *
26  * sale, use or other dealings in this Software without prior written       *
27  * authorization.                                                           *
28  ****************************************************************************/
29
30 /****************************************************************************
31  *   Author:  Juergen Pfeifer, 1995,1997                                    *
32  ****************************************************************************/
33
34 #include "form.priv.h"
35
36 MODULE_ID("$Id: fld_link.c,v 1.16 2020/12/11 23:20:32 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 +--------------------------------------------------------------------------*/
52 FORM_EXPORT(FIELD *)
53 link_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 */