ea7df28aaafa38225286ad45f1de0ad8a87ce8e9
[ncurses.git] / form / fld_link.c
1 /****************************************************************************
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28
29 /****************************************************************************
30  *   Author:  Juergen Pfeifer, 1995,1997                                    *
31  *   Contact: http://www.familiepfeifer.de/Contact.aspx?Lang=en             *
32  ****************************************************************************/
33
34 #include "form.priv.h"
35
36 MODULE_ID("$Id: fld_link.c,v 1.6 2002/07/06 15:33:27 juergen 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 NCURSES_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   if (field && (frow>=0) && (fcol>=0) &&
59       ((err=E_SYSTEM_ERROR) != 0) && /* trick: this resets the default error */
60       (New_Field = (FIELD *)malloc(sizeof(FIELD))) )
61     {
62       *New_Field        = *_nc_Default_Field;
63       New_Field->frow   = frow;
64       New_Field->fcol   = fcol;
65       New_Field->link   = field->link;
66       field->link       = New_Field;
67       New_Field->buf    = field->buf;
68       New_Field->rows   = field->rows;
69       New_Field->cols   = field->cols;
70       New_Field->nrow   = field->nrow;
71       New_Field->nbuf   = field->nbuf;
72       New_Field->drows  = field->drows;
73       New_Field->dcols  = field->dcols;
74       New_Field->maxgrow= field->maxgrow;
75       New_Field->just   = field->just;
76       New_Field->fore   = field->fore;
77       New_Field->back   = field->back;
78       New_Field->pad    = field->pad;
79       New_Field->opts   = field->opts;
80       New_Field->usrptr = field->usrptr;
81       if (_nc_Copy_Type(New_Field,field)) 
82         return New_Field;
83     }
84
85   if (New_Field) 
86     free_field(New_Field);
87
88   SET_ERROR( err );
89   return (FIELD *)0;
90 }
91
92 /* fld_link.c ends here */