new version by lhf

lundump.c

@@ -1,10 +1,11 @@
 /*
-** $Id: lundump.c,v 1.7 1998/03/05 15:45:08 lhf Exp lhf $
+** $Id: lundump.c,v 1.9 1998/06/13 16:54:15 lhf Exp $
 ** load bytecodes from files
 ** See Copyright Notice in lua.h
 */
 
 #include <stdio.h>
+
 #include "lauxlib.h"
 #include "lfunc.h"
 #include "lmem.h"
@@ -15,11 +16,7 @@
 #define	LoadNative(t,D)		LoadBlock(&t,sizeof(t),D)
 
 /* LUA_NUMBER */
-/* if you change the definition of real, make sure you set ID_NUMBER
-* accordingly lundump.h, specially if sizeof(long)!=4.
-* for types other than the ones listed below, you'll have to write your own
-* dump and undump routines.
-*/
+/* see comment in lundump.h */
 
 #if ID_NUMBER==ID_REAL4
 	#define	LoadNumber	LoadFloat
@@ -65,20 +62,23 @@ static unsigned long LoadLong(ZIO* Z)
  return (hi<<16)|lo;
 }
 
+#if ID_NUMBER==ID_REAL4
 /* LUA_NUMBER */
 /* assumes sizeof(long)==4 and sizeof(float)==4 (IEEE) */
 static float LoadFloat(ZIO* Z)
 {
- long l=LoadLong(Z);
+ unsigned long l=LoadLong(Z);
  float f=*(float*)&l;
  return f;
 }
+#endif
 
+#if ID_NUMBER==ID_REAL8
 /* LUA_NUMBER */
 /* assumes sizeof(long)==4 and sizeof(double)==8 (IEEE) */
 static double LoadDouble(ZIO* Z)
 {
- long l[2];
+ unsigned long l[2];
  double f;
  int x=1;
  if (*(char*)&x==1)			/* little-endian */
@@ -94,10 +94,11 @@ static double LoadDouble(ZIO* Z)
  f=*(double*)l;
  return f;
 }
+#endif
 
 static Byte* LoadCode(ZIO* Z)
 {
- long size=LoadLong(Z);
+ unsigned long size=LoadLong(Z);
  unsigned int s=size;
  void* b;
  if (s!=size) luaL_verror("code too long (%ld bytes) in %s",size,zname(Z));
@@ -214,7 +215,7 @@ static void LoadHeader(ZIO* Z)
  f=LoadNumber(Z);
  if (f!=tf)
   luaL_verror("unknown number representation in %s: "
-	"read %g; expected %g",		/* LUA_NUMBER */
+	"read " NUMBER_FMT "; expected " NUMBER_FMT "",	/* LUA_NUMBER */
 	zname(Z),(double)f,(double)tf);
 }
 

lundump.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lundump.h,v 1.5 1998/02/06 20:05:39 lhf Exp lhf $
+** $Id: lundump.h,v 1.6 1998/06/13 16:54:15 lhf Exp $
 ** load pre-compiled Lua chunks
 ** See Copyright Notice in lua.h
 */
@@ -22,32 +22,36 @@ TProtoFunc* luaU_undump1(ZIO* Z);	/* load one chunk */
 #define ID_STR		'S'
 #define ID_FUN		'F'
 
-#define ID_INT4		'l'
-#define ID_REAL4	'f'
-#define ID_REAL8	'd'
-#define ID_NATIVE	'?'
+/* number representation */
+#define ID_INT4		'l'		/* 4-byte integers */
+#define ID_REAL4	'f'		/* 4-byte reals */
+#define ID_REAL8	'd'		/* 8-byte reals */
+#define ID_NATIVE	'?'		/* whatever your machine uses */
 
 /*
 * use a multiple of PI for testing number representation.
-* multiplying by 10E8 gives notrivial integer values.
+* multiplying by 1E8 gives notrivial integer values.
 */
 #define	TEST_NUMBER	3.14159265358979323846E8
 
-/* LUA_NUMBER */
-/* if you change the definition of real, make sure you set ID_NUMBER
-* accordingly, specially if sizeof(long)!=4.
+/* LUA_NUMBER
+* choose one below for the number representation in precompiled chunks.
+* the default is ID_REAL8 because the default for LUA_NUM_TYPE is double.
+* if your machine does not use IEEE 754, use ID_NATIVE.
+* the next version will support conversion to/from IEEE 754.
+*
+* if you change LUA_NUM_TYPE, make sure you set ID_NUMBER accordingly,
+* specially if sizeof(long)!=4.
 * for types other than the ones listed below, you'll have to write your own
 * dump and undump routines.
 */
 
-#if real==float
-	#define	ID_NUMBER	ID_REAL4
-#elif real==double
-	#define	ID_NUMBER	ID_REAL8
-#elif real==long
-	#define	ID_NUMBER	ID_INT4
-#else
-	#define	ID_NUMBER	ID_NATIVE
+#define	ID_NUMBER	ID_REAL8
+
+#if 0
+#define	ID_NUMBER	ID_REAL4
+#define	ID_NUMBER	ID_INT4
+#define	ID_NUMBER	ID_NATIVE
 #endif
 
 #endif