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Command: isalnum | Section: 3 | Source: NetBSD | File: isalnum.3
ISALNUM(3) FreeBSD Library Functions Manual ISALNUM(3)
NAME
isalnum - alphanumeric character test
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h>
int
isalnum(int c);
DESCRIPTION
The isalnum() function tests for any character for which isalpha(3) or
isdigit(3) is true.
RETURN VALUES
The isalnum() function returns zero if the character tests false and
returns non-zero if the character tests true.
SEE ALSO
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)
STANDARDS
The isalnum() function conforms to ANSI X3.159-1989 ("ANSI C89").
CAVEATS
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.
FreeBSD 14.1-RELEASE-p8 April 17, 2008 FreeBSD 14.1-RELEASE-p8