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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 14.0-RELEASE-p6 December 19, 2022 FreeBSD 14.0-RELEASE-p6