limits.h for XS data types

[Marvin Humphrey]

Greets,

Some of the algorithms I'm working on need to use sentinel values,  
which I'd typically get from limits.h.  Can I get away with this?

    U32 aU32 = ULONG_MAX;
    while (aU32 == ULONG_MAX) {
        /* try to change aU32...
         * ...
         */
    }

Is there a "limits.h" analog for XS data types like U32, UV, STRLEN,  
etc?

Marvin Humphrey
Rectangular Research
http://www.rectangular.com/