UniStrtoul converts the initial portion of the string pointed to by nptr to unsigned long integer representation. First, it decomposes the input string into three parts:

• An initial, possibly empty, sequence of white-space characters (as indicated by the space attribute).

• A subject sequence resembling an unsigned long integer represented in some radix determined by the value of base.

• A final string of one or more unrecognized characters, including the terminating null character of the input string.

Then, it attempts to convert the subject sequence to an unsigned long integer, and returns the result in the area pointed to by ulResult. A pointer to the final string is stored in the object pointed to by endptr, provided that endptr is not a null pointer.

• If base is between 2 and 36, the letters a (or A) to z (or Z) inclusive are ascribed the values 10 to 35. Only letters whose ascribed value is less than base are permitted. 
  If base is 0, the expected form of the subject sequence is a decimal, octal or hexadecimal constant. Decimal constants begin with a nonzero digit. Octal constants begin with 0. Hexadecimal constants begin with 0x or 0X.

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