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/* Alternative to tkwait variable */
#include <string.h>
#include <tcl.h>
#include <tk.h>
#include <caml/mlvalues.h>
#include <caml/memory.h>
#include "camltk.h"
value camltk_getvar(var) /* ML */
value var;
{
char *s;
char *stable_var = NULL;
CheckInit();
stable_var = string_to_c(var);
s = Tcl_GetVar(cltclinterp,stable_var,
TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG);
stat_free(stable_var);
if (s == NULL)
tk_error(cltclinterp->result);
else
return(copy_string(s));
}
value camltk_setvar(var,contents) /* ML */
value var;
value contents;
{
char *s;
char *stable_var = NULL;
CheckInit();
/* SetVar makes a copy of the contents. */
/* In case we have write traces in Caml, it's better to make sure that
var doesn't move... */
stable_var = string_to_c(var);
s = Tcl_SetVar(cltclinterp,stable_var, String_val(contents),
TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG);
stat_free(stable_var);
if (s == NULL)
tk_error(cltclinterp->result);
else
return(Val_unit);
}
/* The appropriate type is
typedef char *(Tcl_VarTraceProc) _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, char *part1, char *part2, int flags));
*/
static char * tracevar(clientdata, interp, name1, name2, flags)
ClientData clientdata;
Tcl_Interp *interp; /* Interpreter containing variable. */
char *name1; /* Name of variable. */
char *name2; /* Second part of variable name. */
int flags; /* Information about what happened. */
{
Tcl_UntraceVar2(interp, name1, name2,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
tracevar, clientdata);
callback2(*handler_code,Val_int(clientdata),Val_unit);
return (char *)NULL;
}
/* Sets up a callback upon modification of a variable */
value camltk_trace_var(var,cbid) /* ML */
value var;
value cbid;
{
char *cvar = NULL;
CheckInit();
/* Make a copy of var, since Tcl will modify it in place, and we
* don't trust that much what it will do here
*/
cvar = string_to_c(var);
if (Tcl_TraceVar(cltclinterp, cvar,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
tracevar,
(ClientData) (Long_val(cbid)))
!= TCL_OK) {
stat_free(cvar);
tk_error(cltclinterp->result);
};
stat_free(cvar);
return Val_unit;
}
value camltk_untrace_var(var,cbid) /* ML */
value var;
value cbid;
{
char *cvar = NULL;
CheckInit();
/* Make a copy of var, since Tcl will modify it in place, and we
* don't trust that much what it will do here
*/
cvar = string_to_c(var);
Tcl_UntraceVar(cltclinterp, cvar,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
tracevar,
(ClientData) (Long_val(cbid)));
stat_free(cvar);
return Val_unit;
}
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