Initial checkin.

diff --git a/_PDCLIB_aux.h b/_PDCLIB_aux.h
new file mode 100755 (executable)
index 0000000..6f2e477
--- /dev/null
+++ b/_PDCLIB_aux.h
@@ -0,0 +1,57 @@
+/* $Id$ */
+
+/* Release $Name$ */
+
+/* Auxiliary PDCLib code <_PDCLIB_aux.h>
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+/* -------------------------------------------------------------------------- */
+/* Standard Version                                                           */
+/* -------------------------------------------------------------------------- */
+
+/* Many a compiler gets this wrong, so you might have to hardcode it instead. */
+
+#if __STDC__ != 1
+#error Compiler does not define _ _STDC_ _ to 1 (not standard-compliant)!
+#endif
+
+#ifndef __STDC_VERSION__
+#define _PDCLIB_C_VERSION C90
+#elif __STDC_VERSION__ == 199409L
+#define _PDCLIB_C_VERSION C95
+#elif __STDC_VERSION__ == 199901L
+#define _PDCLIB_C_VERSION C99
+#else
+#error Unsupported _ _STDC_VERSION_ _ (__STDC_VERSION__)
+(supported: ISO/IEC 9899:1990, 9899/AMD1:1995, and 9899:1999).
+#endif
+
+#ifndef __STDC_HOSTED__
+#error Compiler does not define _ _STDC_HOSTED_ _ (not standard-compliant)!
+#elif __STDC_HOSTED__ == 0
+#define _PDCLIB_HOSTED 0
+#elif __STDC_HOSTED__ == 1
+#define _PDCLIB_HOSTED 1
+#else
+#error Compiler does not define _ _STDC_HOSTED_ _ to 0 or 1 (not standard-compliant)!
+#endif
+
+#if _PDCLIB_C_VERSION != C99
+#error As of the current release, PDCLib only supports ISO/IEC 9899:1999 (C99).
+#endif
+
+#if _PDCLIB_HOSTED != 0
+#error As of the current release, PDCLib is not a conforming hosted implementation.
+#endif
+
+/* -------------------------------------------------------------------------- */
+/* Helper macros:                                                             */
+/* _PDCLIB_cc( x, y ) concatenates two preprocessor tokens without extending  */
+/* _PDCLIB_concat( x, y ) concatenates two preprocessor tokens with extending */
+/* -------------------------------------------------------------------------- */
+
+#define _PDCLIB_cc( x, y )     x ## y
+#define _PDCLIB_concat( x, y ) _PDCLIB_cc( x, y )