0aac7db78d12317e33c452a4e7a7771a8584ee29
[ncurses.git] / form / fld_link.c
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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_link.c,v 1.11 2007/10/13 19:30:43 tom Exp $")
36
37 /*---------------------------------------------------------------------------
38 |   Facility      :  libnform  
39 |   Function      :  FIELD *link_field(FIELD *field, int frow, int fcol)  
40 |   
41 |   Description   :  Duplicates the field at the specified position. The
42 |                    new field shares its buffers with the original one,
43 |                    the attributes are independent.
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 link_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("link_field(%p,%d,%d)"), 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"), New_Field));
63       *New_Field = *_nc_Default_Field;
64       New_Field->frow = frow;
65       New_Field->fcol = fcol;
66
67       New_Field->link = field->link;
68       field->link = New_Field;
69
70       New_Field->buf = field->buf;
71       New_Field->rows = field->rows;
72       New_Field->cols = field->cols;
73       New_Field->nrow = field->nrow;
74       New_Field->nbuf = field->nbuf;
75       New_Field->drows = field->drows;
76       New_Field->dcols = field->dcols;
77       New_Field->maxgrow = field->maxgrow;
78       New_Field->just = field->just;
79       New_Field->fore = field->fore;
80       New_Field->back = field->back;
81       New_Field->pad = field->pad;
82       New_Field->opts = field->opts;
83       New_Field->usrptr = field->usrptr;
84
85       if (_nc_Copy_Type(New_Field, field))
86         returnField(New_Field);
87     }
88
89   if (New_Field)
90     free_field(New_Field);
91
92   SET_ERROR(err);
93   returnField((FIELD *)0);
94 }
95
96 /* fld_link.c ends here */