04-30-2016
You could use the character class [[:cntrl:]] for the validity check.
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LEARN ABOUT REDHAT
iswalpha
ISWALPHA(3) Linux Programmer's Manual ISWALPHA(3)
NAME
iswalpha - test for alphabetic wide character
SYNOPSIS
#include <wctype.h>
int iswalpha(wint_t wc);
DESCRIPTION
The iswalpha function is the wide-character equivalent of the isalpha function. It tests whether wc is a wide character belonging to the
wide character class "alpha".
The wide character class "alpha" is a subclass of the wide character class "alnum", and therefore also a subclass of the wide character
class "graph" and of the wide character class "print".
Being a subclass of the wide character class "print", the wide character class "alpha" is disjoint from the wide character class "cntrl".
Being a subclass of the wide character class "graph", the wide character class "alpha" is disjoint from the wide character class "space"
and its subclass "blank".
Being a subclass of the wide character class "alnum", the wide character class "alpha" is disjoint from the wide character class "punct".
The wide character class "alpha" is disjoint from the wide character class "digit".
The wide character class "alpha" contains the wide character classes "upper" and "lower".
The wide character class "alpha" always contains at least the letters 'A' to 'Z' and 'a' to 'z'.
RETURN VALUE
The iswalpha function returns non-zero if wc is a wide character belonging to the wide character class "alpha". Otherwise it returns zero.
CONFORMING TO
ISO/ANSI C, UNIX98
SEE ALSO
isalpha(3), iswctype(3)
NOTES
The behaviour of iswalpha depends on the LC_CTYPE category of the current locale.
GNU
1999-07-25 ISWALPHA(3)