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Command: isxdigit | Section: 3 | Source: OpenBSD | File: isxdigit.3
ISXDIGIT(3) FreeBSD Library Functions Manual ISXDIGIT(3)
NAME
isxdigit, isxdigit_l - hexadecimal-digit single-byte character test
SYNOPSIS
#include <ctype.h>
int
isxdigit(int c);
int
isxdigit_l(int c, locale_t locale);
DESCRIPTION
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.
RETURN VALUES
These functions return zero if the character tests false or non-zero if
the character tests true.
ENVIRONMENT
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).
SEE ALSO
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)
STANDARDS
The isxdigit() function conforms to ANSI X3.159-1989 ("ANSI C89"), and
isxdigit_l() to IEEE Std 1003.1-2008 ("POSIX.1").
HISTORY
The isxdigit() function first appeared in Version 7 AT&T UNIX, and
isdigit_l() has been available since OpenBSD 6.2.
CAVEATS
The argument c must be EOF or representable as an unsigned char;
otherwise, the result is undefined.
FreeBSD 14.1-RELEASE-p8 September 11, 2022 FreeBSD 14.1-RELEASE-p8