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ISALNUM(3) Library Functions Manual ISALNUM(3)

isalnumalphanumeric character test

library “libc”

#include <ctype.h>

int
isalnum(int c);

The () function tests for any character for which isalpha(3) or isdigit(3) is true.

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

ctype(3), isalpha(3), isascii(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)

The isalnum() function conforms to ANSI X3.159-1989 (“ANSI C89”).

The argument to isalnum() must be EOF or representable as an unsigned char; otherwise, the behavior is undefined. See the CAVEATS section of ctype(3) for more details.

April 17, 2008 NetBSD-9.2