--- /dev/null
+/* $Id$ */
+
+/* isspace( 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>
+#include <stdbool.h>
+
+#ifndef REGTEST
+
+int isspace( int c )
+{
+ switch ( c )
+ {
+ case ' ':
+ case '\f':
+ case '\n':
+ case '\r':
+ case '\t':
+ case '\v':
+ return true;
+ default:
+ return false;
+ }
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+ TESTCASE( isspace( ' ' ) );
+ TESTCASE( isspace( '\f' ) );
+ TESTCASE( isspace( '\n' ) );
+ TESTCASE( isspace( '\r' ) );
+ TESTCASE( isspace( '\t' ) );
+ TESTCASE( isspace( '\v' ) );
+ TESTCASE( ! isspace( 'a' ) );
+ return TEST_RESULTS;
+}
+
+#endif