isalnum(3) - NetBSD Manual Pages

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ISALNUM(3)              NetBSD 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.

NetBSD 9.1                      April 17, 2008                      NetBSD 9.1