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Man Pages
ISRUNE(3) FreeBSD Library Functions Manual ISRUNE(3)

isrune
valid character test

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.

ctype(3), isascii(3), iswrune(3), ascii(7)

The isrune() function appeared in 4.4BSD.
March 30, 2004 FreeBSD 13.1-RELEASE

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