--- /dev/null
+/* $Id$ */
+
+/* isalnum( int )
+
+ This file is part of the Public Domain C Library (PDCLib).
+ Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <ctype.h>
+
+#ifndef REGTEST
+
+int isalnum( int c )
+{
+ return ( _PDCLIB_locale_info.ctype[c].flags & ( _PDCLIB_CTYPE_ALPHA | _PDCLIB_CTYPE_DIGIT ) );
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+ TESTCASE( isalnum( 'a' ) );
+ TESTCASE( isalnum( 'z' ) );
+ TESTCASE( isalnum( 'A' ) );
+ TESTCASE( isalnum( 'Z' ) );
+ TESTCASE( isalnum( '0' ) );
+ TESTCASE( isalnum( '9' ) );
+ TESTCASE( ! isalnum( ' ' ) );
+ TESTCASE( ! isalnum( '\n' ) );
+ TESTCASE( ! isalnum( '@' ) );
+ return TEST_RESULTS;
+}
+
+#endif