isalnum(3) - NetBSD Manual Pages

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() 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 and returns
     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 C89'').


CAVEATS

     The argument to isalnum() must be EOF or representable as an unsigned
     char; otherwise, the result is undefined.

NetBSD 3.1                       June 29, 1991                      NetBSD 3.1