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

NAME

     isrune, isrune_l - valid character test

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <ctype.h>

     int
     isrune(int c);

     int
     isrune_l(int c, locale_t loc);

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 isrune_l() function takes an explicit locale argument, whereas the
     isrune() function uses the current global or per-thread locale.

RETURN VALUES

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

COMPATIBILITY

     The 4.4BSD extension of accepting arguments outside of the range of the
     unsigned char type in locales with large character sets is considered
     obsolete and may not be supported in future releases.  The iswrune() or
     iswrune_l() function should be used instead.

SEE ALSO

     ctype(3), ctype_l(3), isascii(3), iswrune(3), iswrune_l(3), xlocale(3),
     ascii(7)

HISTORY

     The isrune() function appeared in 4.4BSD.

FreeBSD 15.1-STABLE-HBSD       December 19, 2022                     ISRUNE(3)