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.. COMMENT: This file was automatically generated from the file:
.. COMMENT: @NEWLIB_FILENAME@
.. COMMENT: Generateed on: @DATE@
.. isalnum:
isalnum - Alphanumeric character predicate (GOAL)
----------------------------------------------------------------
.. index:: isalnum
.. index:: alphanumeric character predicate
.. index:: isalnum_l
**CALLING SEQUENCE:**
.. code-block:: c
#include <ctype.h>
int isalnum(int c);
#include <ctype.h>
int isalnum_l(int c, locale_t locale);
**STATUS CODES:**
*isalnum*,*isalnum_l* return non-zero if ``c`` is a letter or a digit.
**DESCRIPTION:**
*isalnum* is a macro which classifies singlebyte charset values by table
lookup. It is a predicate returning non-zero for alphabetic or
numeric ASCII characters, and *0* for other arguments. It is defined
only if ``c`` is representable as an unsigned char or if ``c`` is EOF.
*isalnum_l* is like *isalnum* but performs the check based on the
locale specified by the locale object locale. If ``locale`` is
LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
You can use a compiled subroutine instead of the macro definition by
undefining the macro using ``#undef isalnum`` or ``#undef isalnum_l``.
**ORIGIN**
The information in this section was generated from documentation
included with the `Newlib C Library <https://sourceware.org/newlib/>`_.
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