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ISXDIGIT(3) Library Functions Manual ISXDIGIT(3)

isxdigit, isxdigit_l
hexadecimal-digit single-byte character test

#include <ctype.h>
int
isxdigit(int c);
int
isxdigit_l(int c, locale_t locale);

The isxdigit() and isxdigit_l() functions test for any hexadecimal-digit character.
In the C locale, the complete list of hexadecimal digits is 0, 1–9, A–F, and a–f. OpenBSD always uses the C locale for these functions, ignoring the global locale, the thread-specific locale, and the locale argument.

These functions return zero if the character tests false or non-zero if the character tests true.

On systems supporting non-ASCII single-byte character encodings, these functions may return non-zero for additional characters, and the results of isxdigit() may depend on the LC_CTYPE locale(1).

isalnum(3), isalpha(3), isascii(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), iswxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)

The isxdigit() function conforms to ANSI X3.159-1989 (“ANSI C89”), and isxdigit_l() to IEEE Std 1003.1-2008 (“POSIX.1”).

The isxdigit() function first appeared in Version 7 AT&T UNIX, and isdigit_l() has been available since OpenBSD 6.2.

The argument c must be EOF or representable as an unsigned char; otherwise, the result is undefined.
September 5, 2017 OpenBSD-current