isalnum man page on OpenBSD
[printable version]
ISALNUM(3) OpenBSD Programmer's Manual ISALNUM(3)
NAME
isalnum - alphanumeric character test
SYNOPSIS
#include <ctype.h>
int
isalnum(int c);
DESCRIPTION
The isalnum() macro tests for any character for which isalpha(3) or
isdigit(3) is true.
RETURN VALUES
The isalnum() macro returns zero if the character tests false or non-zero
if the character tests true.
SEE ALSO
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)
STANDARDS
The isalnum() function conforms to ANSI X3.159-1989 (``ANSI C'').
CAVEATS
The argument to isalnum() must be EOF or representable as an unsigned
char; otherwise, the result is undefined.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9
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