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Functions
Functions to test ASCII char attributes

## Detailed Description

The is...() functions in ctype.h will misbehave with 'char' argument.

We introduce more robust functions. These functions only operate on ascii chars and are intended to be locale-independent.

## Functions
INLINE THREAD_SAFE bool ida_local | qisascii (char c)
INLINE THREAD_SAFE bool ida_local | qisspace (char c)
INLINE THREAD_SAFE bool ida_local | qisalpha (char c)
INLINE THREAD_SAFE bool ida_local | qisalnum (char c)
INLINE THREAD_SAFE bool ida_local | qispunct (char c)
INLINE THREAD_SAFE bool ida_local | qislower (char c)
INLINE THREAD_SAFE bool ida_local | qisupper (char c)
INLINE THREAD_SAFE bool ida_local | qisprint (char c)
INLINE THREAD_SAFE bool ida_local | qisdigit (char c)
INLINE THREAD_SAFE bool ida_local | qisxdigit (char c)