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#include <tcl.h>
#include <tk.h>
#include <caml/mlvalues.h>
#include <caml/callback.h>
#include "camltk.h"
value * tkerror_exn = NULL;
value * handler_code = NULL;
/* The Tcl command for evaluating callback in Caml */
int CamlCBCmd(clientdata, interp, argc, argv)
ClientData clientdata;
Tcl_Interp *interp;
int argc;
char *argv[];
{
CheckInit();
/* Assumes no result */
Tcl_SetResult(interp, NULL, NULL);
if (argc >= 2) {
int id;
if (Tcl_GetInt(interp, argv[1], &id) != TCL_OK)
return TCL_ERROR;
callback2(*handler_code,Val_int(id),copy_string_list(argc - 2,&argv[2]));
/* Never fails (Caml would have raised an exception) */
/* but result may have been set by callback */
return TCL_OK;
}
else
return TCL_ERROR;
}
/* Callbacks are always of type _ -> unit, to simplify storage
* But a callback can nevertheless return something (to Tcl) by
* using the following. TCL_VOLATILE ensures that Tcl will make
* a copy of the string
*/
value camltk_return (v) /* ML */
value v;
{
CheckInit();
Tcl_SetResult(cltclinterp, String_val(v), TCL_VOLATILE);
return Val_unit;
}
/* Note: raise_with_string WILL copy the error message */
void tk_error(errmsg)
char *errmsg;
{
raise_with_string(*tkerror_exn, errmsg);
}
/* The initialisation of the C global variables pointing to Caml values
must be made accessible from Caml, so that we are sure that it *always*
takes place during loading of the protocol module
*/
value camltk_init(v) /* ML */
value v;
{
/* Initialize the Caml pointers */
if (tkerror_exn == NULL)
tkerror_exn = caml_named_value("tkerror");
if (handler_code == NULL)
handler_code = caml_named_value("camlcb");
return Val_unit;
}
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