Manual Pages  — ISRUNE

isrune – valid character test

LIBRARY SYNOPSIS DESCRIPTION RETURN VALUES SEE ALSO HISTORY

Standard C Library (libc, -lc)

#include <ctype.h>

int
isrune(int c);

The isrune() function tests for any character that is valid in the current character set. In the ASCII character set, this is equivalent to isascii().

The isrune() function returns zero if the character tests false and returns non-zero if the character tests true.

The isrune() function appeared in BSD 4.4 .