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ISALNUM(3P)                POSIX Programmer's Manual               ISALNUM(3P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
NAME
       isalnum - test for an alphanumeric character
SYNOPSIS
       #include <ctype.h>
       int isalnum(int c);

DESCRIPTION
       The isalnum() function shall test whether c is  a  character  of  class
       alpha  or  digit  in the program's current locale; see the Base Defini-
       tions volume of IEEE Std 1003.1-2001, Chapter 7, Locale.
       The c argument is an int, the value  of  which  the  application  shall
       ensure  is  representable  as an unsigned char or equal to the value of
       the macro EOF. If the argument has any other  value,  the  behavior  is
       undefined.
RETURN VALUE
       The  isalnum()  function  shall return non-zero if c is an alphanumeric
       character; otherwise, it shall return 0.
ERRORS
       No errors are defined.
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       To ensure applications  portability,  especially  across  natural  lan-
       guages,  only  this  function  and those listed in the SEE ALSO section
       should be used for character classification.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       isalpha(),  iscntrl(),  isdigit(),  isgraph(),  islower(),   isprint(),
       ispunct(), isspace(), isupper(), isxdigit(), setlocale(), the Base Def-
       initions volume of IEEE Std 1003.1-2001, Chapter 7, Locale,  <ctype.h>,
       <stdio.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained  online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                  2003                          ISALNUM(3P)