ncurses 6.2 - patch 20200509
[ncurses.git] / form / fld_dup.c
1 /****************************************************************************
2  * Copyright 2020 Thomas E. Dickey                                          *
3  * Copyright 1998-2010,2012 Free Software Foundation, Inc.                  *
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11  * furnished to do so, subject to the following conditions:                 *
12  *                                                                          *
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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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27  * authorization.                                                           *
28  ****************************************************************************/
29
30 /****************************************************************************
31  *   Author:  Juergen Pfeifer, 1995,1997                                    *
32  ****************************************************************************/
33
34 #include "form.priv.h"
35
36 MODULE_ID("$Id: fld_dup.c,v 1.17 2020/03/29 00:39:41 tom Exp $")
37
38 /*---------------------------------------------------------------------------
39 |   Facility      :  libnform
40 |   Function      :  FIELD *dup_field(FIELD *field, int frow, int fcol)
41 |
42 |   Description   :  Duplicates the field at the specified position. All
43 |                    field attributes and the buffers are copied.
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 dup_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("dup_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       New_Field->link = New_Field;
67       New_Field->rows = field->rows;
68       New_Field->cols = field->cols;
69       New_Field->nrow = field->nrow;
70       New_Field->drows = field->drows;
71       New_Field->dcols = field->dcols;
72       New_Field->maxgrow = field->maxgrow;
73       New_Field->nbuf = field->nbuf;
74       New_Field->just = field->just;
75       New_Field->fore = field->fore;
76       New_Field->back = field->back;
77       New_Field->pad = field->pad;
78       New_Field->opts = field->opts;
79       New_Field->usrptr = field->usrptr;
80
81       if (_nc_Copy_Type(New_Field, field))
82         {
83           size_t len;
84
85           len = Total_Buffer_Size(New_Field);
86           if ((New_Field->buf = (FIELD_CELL *)malloc(len * 20)))
87             {
88               memcpy(New_Field->buf, field->buf, len);
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 */