ISRUNE(3)

NAME
isrune, isrune_l - valid character test

LIBRARY
libc

SYNOPSIS
#include <ctype.h>
int
isrune(int c);
#include <xlocale.h>
int
isrune_l(int c, locale_t locale);

DESCRIPTION
The isrune() and isrune_l() functions test for any character that is valid in the current character set. In the ASCII character set, this is equivalent to isascii().

The _l-suffixed version takes an explicit locale argument, whereas the non-suffixed version uses the current global or per-thread locale.

RETURN VALUES
The isrune() and isrune_l() functions return zero if the character tests false and returns non-zero if the character tests true.

SEE ALSO
ctype(3), ctype_l(3), isascii(3), iswrune(3), xlocale(3), ascii(7)

HISTORY
The isrune() function appeared in 4.4BSD.