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isrune(3) valid character test
ctype, digittoint, isalnum, isalpha, isascii, iscntrl, isdigit, isgraph, ishexnumber, isideogram, islower, isnumber, isphonogram, isprint, ispunct, isrune, isspace, isspecial, isupper, isxdigit, toascii, tolower, toupper, isblank(3) character classification functions
ISRUNE(3) MidnightBSD Library Functions Manual ISRUNE(3)

isrune — valid character test

Standard C Library (libc, -lc)

#include <ctype.h>

int
isrune(int c);

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

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 midnightbsd-3.1