X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=internals%2F_PDCLIB_aux.h;h=ebbced4abc8658b3c312b2d4b7b5a984ecfb65ef;hb=7e1986c10dea181d5a096b6c6de78ab23dabcb95;hp=8c4e897003e7e25c13f58c26bd3af274fa4d164f;hpb=b6d270371b520e0a85075d8bf84c10c53d9b30bf;p=pdclib

diff --git a/internals/_PDCLIB_aux.h b/internals/_PDCLIB_aux.h
index 8c4e897..ebbced4 100644
--- a/internals/_PDCLIB_aux.h
+++ b/internals/_PDCLIB_aux.h
@@ -1,13 +1,17 @@
-/* $Id$ */
-
-/* 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.
 */
 
+#ifndef _PDCLIB_AUX_H
+#define _PDCLIB_AUX_H _PDCLIB_AUX_H
+
+/* -------------------------------------------------------------------------- */
+/* You should not have to edit anything in this file; if you DO have to, it   */
+/* would be considered a bug / missing feature: notify the author(s).         */
+/* -------------------------------------------------------------------------- */
+
 /* -------------------------------------------------------------------------- */
 /* Standard Version                                                           */
 /* -------------------------------------------------------------------------- */
@@ -18,24 +22,17 @@
 #error Compiler does not define _ _STDC_ _ to 1 (not standard-compliant)!
 #endif
 
-#ifndef __STDC_VERSION__
-#define _PDCLIB_C_VERSION 90
-#define _PDCLIB_restrict
-#define _PDCLIB_inline
-#elif __STDC_VERSION__ == 199409L
-#define _PDCLIB_C_VERSION 95
+#if __STDC_VERSION__ < 199901L
 #define _PDCLIB_restrict
 #define _PDCLIB_inline
-#elif __STDC_VERSION__ == 199901L
-#define _PDCLIB_C_VERSION 99
+#error PDCLib might not be fully conforming to either C89 or C95 prior to v2.x.
+#else
 #define _PDCLIB_restrict restrict
 #define _PDCLIB_inline inline
-#else
-#error Unsupported _ _STDC_VERSION_ _ (__STDC_VERSION__) (supported: ISO/IEC 9899:1990, 9899/AMD1:1995, and 9899:1999).
 #endif
 
 #ifndef __STDC_HOSTED__
-#warning Compiler does not define _ _STDC_HOSTED_ _ (not standard-compliant)!
+#error Compiler does not define _ _STDC_HOSTED_ _ (not standard-compliant)!
 #elif __STDC_HOSTED__ == 0
 #define _PDCLIB_HOSTED 0
 #elif __STDC_HOSTED__ == 1
@@ -44,20 +41,26 @@
 #error Compiler does not define _ _STDC_HOSTED_ _ to 0 or 1 (not standard-compliant)!
 #endif
 
-#if _PDCLIB_C_VERSION != 99
-#warning Up to and including v1.x, PDCLib is only aiming at ISO/IEC 9899:1999 (C99).
-#warning PDCLib might not be fully conforming to either C89 or C95 prior to v2.x.
-#endif
-
 /* -------------------------------------------------------------------------- */
 /* Helper macros:                                                             */
 /* _PDCLIB_cc( x, y ) concatenates two preprocessor tokens without extending  */
 /* _PDCLIB_concat( x, y ) concatenates two preprocessor tokens with extending */
+/* _PDCLIB_static_assert( e, m ) does a compile-time assertion of expression  */
+/*                               e, with m as the failure message.            */
+/* _PDCLIB_TYPE_SIGNED( type ) resolves to true if type is signed.            */
+/* _PDCLIB_TWOS_COMPLEMENT( type ) resolves to true if two's complement is    */
+/*                                 used for type.                             */
 /* -------------------------------------------------------------------------- */
 
 #define _PDCLIB_cc( x, y )     x ## y
 #define _PDCLIB_concat( x, y ) _PDCLIB_cc( x, y )
 
+#define _PDCLIB_static_assert( e, m ) enum { _PDCLIB_concat( _PDCLIB_assert_, __LINE__ ) = 1 / ( !!(e) ) }
+
+#define _PDCLIB_TYPE_SIGNED( type ) (((type) -1) < 0)
+#define _PDCLIB_TWOS_COMPLEMENT( type ) ((type) ~ (type) 0 < 0 )
+
 #define _PDCLIB_symbol2value( x ) #x
 #define _PDCLIB_symbol2string( x ) _PDCLIB_symbol2value( x )
-#define _PDCLIB_symbol2identity( x ) x
+
+#endif