How to input a boolean to a C s-function

I can input boolean data into a C s-function by defining it as an int32 (see code below). How do I input boolean data with SS_BOOLEAN or SS_UINT8 type? I specified the signal data type explicitly in my Simulink model and s-function but when I defined the data as boolean or uint8, I got strange numbers instead of 1 or 0.

 static void mdlInitializeSizes( SimStruct *S )
 {
     ...
     ssSetInputPortRequiredContiguous(S, 0, true);
     ssSetInputPortDataType(S, 0, SS_INT32);
     ...
 }
 static void mdlOutputs( SimStruct *S, int_T tid )
 {
     const int *myBoolean = (const int*) ssGetInputPortSignal( S, 0 );
     ...
 }

[Kaustubha Govind]

Do you also convert the corresponding input to boolean or uint8 when you change the S-function input port data? If yes, how do you achieve this conversion?