AVR Libc Library Reference
int isalnum(int __c)
int isalpha(int __c)
int isascii(int __c)
int isblank(int __c)
int iscntrl(int __c)
int isdigit(int __c)
int isgraph(int __c)
int islower(int __c)
int isprint(int __c)
int ispunct(int __c)
int isspace(int __c)
int isupper(int __c)
int isxdigit(int __c)
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