#include <tcl.h>

/**
 * puts [set a [expr {20 * 30}]
 */
void EvalString(Tcl_Interp *interp) {
    Tcl_Obj *result;
    char script[] = "set a [expr {20 * 30}]";
    
    if (Tcl_Eval(interp, script) != TCL_OK) {
        fprintf(stderr, "Error was: %s\n", Tcl_GetStringResult(interp));
        return;
    }
    result = Tcl_GetObjResult(interp);
    printf("%s\n", Tcl_GetStringFromObj(result, NULL));
}

/**
 * puts [set a [expr {30 * 30}]]
 */
void EvalStringObj(Tcl_Interp *interp) {
    Tcl_Obj *script;
    Tcl_Obj *result;
    
    script = Tcl_NewStringObj("set a [expr {30 * 30}]", -1);
    Tcl_IncrRefCount(script);
    Tcl_EvalObjEx(interp, script, 0);
    result = Tcl_GetObjResult(interp);
    printf("%s\n", Tcl_GetStringFromObj(result, NULL));
}

/**
 * puts {hello world}
 */
void EvalListObj(Tcl_Interp *interp) {
    Tcl_Obj *cmd;
    cmd = Tcl_NewObj();
    Tcl_ListObjAppendElement(interp, cmd, Tcl_NewStringObj("puts", -1));
    Tcl_ListObjAppendElement(interp, cmd, Tcl_NewStringObj("hello world", -1));
    Tcl_IncrRefCount(cmd);
    Tcl_EvalObjEx(interp, cmd, 0);
    Tcl_DecrRefCount(cmd);
}

/**
 * puts [set a 32]
 */
void Eval(Tcl_Interp *interp) {
    int i;
    Tcl_Obj *scriptArr[3];
    Tcl_Obj *resultObj;
    int result;
    
    scriptArr[0] = Tcl_NewStringObj("set", 3);
    scriptArr[1] = Tcl_NewStringObj("a", 1);
    scriptArr[2] = Tcl_NewIntObj(32);
    for (i = 0; i < 3; ++i) {
        Tcl_IncrRefCount(scriptArr[i]);
    }
    Tcl_EvalObjv(interp, 3, scriptArr, 0);
    for (i = 0; i < 3; ++i) {
        Tcl_DecrRefCount(scriptArr[i]);
    }
    resultObj = Tcl_GetObjResult(interp);
    Tcl_IncrRefCount(resultObj);
    Tcl_GetIntFromObj(interp, resultObj, &result);
    Tcl_DecrRefCount(resultObj);
    printf("%d\n", result);
}

int main(int argc, char *argv[]) {
    Tcl_Interp *interp;
    
    interp = Tcl_CreateInterp();
    EvalString(interp);
    EvalStringObj(interp);
    EvalListObj(interp);
    Eval(interp);
    Tcl_DeleteInterp(interp);
    return 0;
}

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