* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: c.h,v 1.64 2000/01/26 05:57:46 momjian Exp $
+ * $Id: c.h,v 1.65 2000/03/19 22:08:51 tgl Exp $
*
*-------------------------------------------------------------------------
*/
/*
* TABLE OF CONTENTS
*
- * When adding stuff to this file, please try and put stuff
+ * When adding stuff to this file, please try to put stuff
* into the relevant section, or add new sections as appropriate.
*
* section description
* 10) Berkeley-specific defs
* 11) system-specific hacks
*
- * NOTES
- *
- * This file is MACHINE AND COMPILER dependent!!! (For now.)
- *
* ----------------------------------------------------------------
*/
#ifndef C_H
*
* If your machine meets these requirements, Datums should also be checked
* to see if the positioning is correct.
- *
- * This file is MACHINE AND COMPILER dependent!!!
*/
typedef unsigned long Datum; /* XXX sizeof(long) >= sizeof(void *) */
* Returns pointer value of a datum.
*/
-#define DatumGetPointer(X) ((Pointer) X)
+#define DatumGetPointer(X) ((Pointer) (X))
/*
* PointerGetDatum
* Returns datum representation for a pointer.
*/
-#define PointerGetDatum(X) ((Datum) X)
+#define PointerGetDatum(X) ((Datum) (X))
/*
* DatumGetName
* Returns name value of a datum.
*/
-#define DatumGetName(X) ((Name) DatumGetPointer((Datum) X))
+#define DatumGetName(X) ((Name) DatumGetPointer((Datum) (X)))
/*
* NameGetDatum
* Returns datum representation for a name.
*/
-#define NameGetDatum(X) PointerGetDatum((Pointer) X)
+#define NameGetDatum(X) PointerGetDatum((Pointer) (X))
/*
* This is really a pointer, of course.
*/
-#define DatumGetFloat32(X) ((float32) DatumGetPointer((Datum) X))
+#define DatumGetFloat32(X) ((float32) DatumGetPointer(X))
/*
* Float32GetDatum
* This is really a pointer, of course.
*/
-#define Float32GetDatum(X) PointerGetDatum((Pointer) X)
+#define Float32GetDatum(X) PointerGetDatum((Pointer) (X))
/*
* DatumGetFloat64
* This is really a pointer, of course.
*/
-#define Float64GetDatum(X) PointerGetDatum((Pointer) X)
+#define Float64GetDatum(X) PointerGetDatum((Pointer) (X))
/* ----------------------------------------------------------------
* Section 5: IsValid macros for system types
* PointerIsValid
* True iff pointer is valid.
*/
-#define PointerIsValid(pointer) (bool)((void*)(pointer) != NULL)
-
-/*
- * PointerIsInBounds
- * True iff pointer is within given bounds.
- *
- * Note:
- * Assumes the bounded interval to be [min,max),
- * i.e. closed on the left and open on the right.
- */
-#define PointerIsInBounds(pointer, min, max) \
- ((min) <= (pointer) && (pointer) < (max))
+#define PointerIsValid(pointer) ((void*)(pointer) != NULL)
/*
* PointerIsAligned
* Isn't CPP fun?
*/
#define TrapMacro(condition, exception) \
- ((bool) ((! assert_enabled) || (! condition) || \
+ ((bool) ((! assert_enabled) || ! (condition) || \
(ExceptionalCondition(CppAsString(condition), \
&(exception), \
(char*) NULL, __FILE__, __LINE__))))
#ifndef USE_ASSERT_CHECKING
#define Assert(condition)
-#define AssertMacro(condition) (void)true
+#define AssertMacro(condition) ((void)true)
#define AssertArg(condition)
#define AssertState(condition)
#define assert_enabled 0
Trap(!(condition), FailedAssertion)
#define AssertMacro(condition) \
- (void)TrapMacro(!(condition), FailedAssertion)
+ ((void) TrapMacro(!(condition), FailedAssertion))
#define AssertArg(condition) \
Trap(!(condition), BadArg)
* #define foo(x) (LogAssertMacro(x != 0, "yow!") && bar(x))
*/
#define LogTrapMacro(condition, exception, printArgs) \
- ((bool) ((! assert_enabled) || (! condition) || \
+ ((bool) ((! assert_enabled) || ! (condition) || \
(ExceptionalCondition(CppAsString(condition), \
&(exception), \
vararg_format printArgs, __FILE__, __LINE__))))
/*
* StrNCpy
- * Does string copy, and forces terminating NULL
- */
-/* we do this so if the macro is used in an if action, it will work */
-#define StrNCpy(dst,src,len) \
-( \
- ((len) > 0) ? \
- ( \
- strncpy((dst),(src),(len)-1), \
- *((dst)+(len)-1)='\0' \
- ) \
- : \
- (dummyret)NULL,(void)(dst) \
-)
+ * Like standard library function strncpy(), except that result string
+ * is guaranteed to be null-terminated --- that is, at most N-1 bytes
+ * of the source string will be kept.
+ * Also, the macro returns no result (too hard to do that without
+ * evaluating the arguments multiple times, which seems worse).
+ */
+#define StrNCpy(dst,src,len) \
+ do \
+ { \
+ char * _dst = (dst); \
+ Size _len = (len); \
+\
+ if (_len > 0) \
+ { \
+ strncpy(_dst, (src), _len); \
+ _dst[_len-1] = '\0'; \
+ } \
+ } while (0)
+
/* Get a bit mask of the bits set in non-int32 aligned addresses */
#define INT_ALIGN_MASK (sizeof(int32) - 1)
/*
- * This function gets call too often, so we inline it if we can.
- * Are we aligned for int32?
- * We have to cast the pointer to int so we can do the AND
+ * MemSet
+ * Exactly the same as standard library function memset(), but considerably
+ * faster for zeroing small word-aligned structures (such as parsetree nodes).
+ * This has to be a macro because the main point is to avoid function-call
+ * overhead.
+ *
* We got the 64 number by testing this against the stock memset() on
- * BSD/OS 3.0. Larger values were slower.
- */
-#define MemSet(start, val, len) do \
- { \
- if (((long)(start) & INT_ALIGN_MASK) == 0 && \
- ((len) & INT_ALIGN_MASK) == 0 && \
- (val) == 0 && \
- (len) <= 64) \
- { \
- int32 *_i = (int32 *)(start); \
- int32 *_stop = (int32 *)((char *)(start) + (len)); \
- \
- while (_i < _stop) \
- *_i++ = 0; \
- } \
- else \
- memset((start), (val), (len)); \
- } while (0)
+ * BSD/OS 3.0. Larger values were slower. (I think the crossover point
+ * could be a good deal higher for most platforms, actually --- tgl)
+ */
+#define MemSet(start, val, len) \
+ do \
+ { \
+ int32 * _start = (int32 *) (start); \
+ int _val = (val); \
+ Size _len = (len); \
+\
+ if ((((long) _start) & INT_ALIGN_MASK) == 0 && \
+ (_len & INT_ALIGN_MASK) == 0 && \
+ _val == 0 && \
+ _len <= MEMSET_LOOP_LIMIT) \
+ { \
+ int32 * _stop = (int32 *) ((char *) _start + _len); \
+ while (_start < _stop) \
+ *_start++ = 0; \
+ } \
+ else \
+ memset((char *) _start, _val, _len); \
+ } while (0)
+
+#define MEMSET_LOOP_LIMIT 64
+
/* ----------------------------------------------------------------
* Section 9: externs
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