osx man page for isrune

ISRUNE(3)						   BSD Library Functions Manual 						 ISRUNE(3)

NAME
     isrune -- valid character test

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <ctype.h>

     int
     isrune(int c);

DESCRIPTION
     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().

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

SEE ALSO
     ctype(3), isascii(3), iswrune(3), ascii(7), isalnum_l

HISTORY
     The isrune() function appeared in 4.4BSD.

BSD
								  March 30, 2004							       BSD