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