Copied from rough/bigdecimal,documents & some sample programs added.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@3625 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 190 insertions, 0 deletions

diff --git a/ext/bigdecimal/bigdecimal.h b/ext/bigdecimal/bigdecimal.h
new file mode 100644
index 0000000000..b7d2474e0b
--- /dev/null
+++ b/ext/bigdecimal/bigdecimal.h
@@ -0,0 +1,190 @@
+/*
+ *
+ * Ruby BigDecimal(Variable decimal precision) extension library. 
+ *
+ * Copyright(C) 2002 by Shigeo Kobayashi(shigeo@tinyforest.gr.jp) 
+ *
+ * You may distribute under the terms of either the GNU General Public 
+ * License or the Artistic License, as specified in the README file 
+ * of this BigDecimal distribution. 
+ *
+ *  2002-12-06
+ *    The sqrt() bug reported by Bret Jolly fixed.
+ *
+ */
+
+#ifndef  ____BIG_DECIMAL__H____
+#define  ____BIG_DECIMAL__H____
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+/*
+ *   #define VP_EXPORT other than static to let VP_ routines 
+ *   be called from outside of this module.
+ */
+#define VP_EXPORT static 
+
+#define U_LONG unsigned long
+#define S_LONG long
+#define U_INT  unsigned int
+#define S_INT  int
+
+/* Exception codes */
+#define VP_EXCEPTION_ALL        ((unsigned short)0xFFFF)
+#define VP_EXCEPTION_INFINITY   ((unsigned short)0x0001)
+#define VP_EXCEPTION_NaN        ((unsigned short)0x0002)
+#define VP_EXCEPTION_UNDERFLOW  ((unsigned short)0x0004)
+#define VP_EXCEPTION_OVERFLOW   ((unsigned short)0x0001) /* 0x0008) */
+#define VP_EXCEPTION_ZERODIVIDE ((unsigned short)0x0001) /* 0x0010) */
+
+/* Following 2 exceptions cann't controlled by user */
+#define VP_EXCEPTION_OP         ((unsigned short)0x0020)
+#define VP_EXCEPTION_MEMORY     ((unsigned short)0x0040)
+
+#define VP_SIGN_NaN                0 /* NaN                      */
+#define VP_SIGN_POSITIVE_ZERO      1 /* Positive zero            */
+#define VP_SIGN_NEGATIVE_ZERO     -1 /* Negative zero            */
+#define VP_SIGN_POSITIVE_FINITE    2 /* Positive finite number   */
+#define VP_SIGN_NEGATIVE_FINITE   -2 /* Negative finite number   */
+#define VP_SIGN_POSITIVE_INFINITE  3 /* Positive infinite number */
+#define VP_SIGN_NEGATIVE_INFINITE -3 /* Negative infinite number */
+
+/*
+ * VP representation
+ *  r = 0.xxxxxxxxx *BASE**exponent
+ */
+typedef struct {
+    VALUE  obj;     /* Back pointer(VALUE) for Ruby object.     */
+    U_LONG MaxPrec; /* Maximum precision size                   */
+                    /* This is the actual size of pfrac[]       */
+                    /*(frac[0] to frac[MaxPrec] are available). */
+    U_LONG Prec;    /* Current precision size.                  */
+                    /* This indicates how much the.             */
+                    /* the array frac[] is actually used.       */
+    S_INT  exponent;/* Exponent part.                           */
+    short  sign;    /* Attributes of the value.                 */
+                    /*
+                     *        ==0 : NaN
+                     *          1 : Positive zero
+                     *         -1 : Negative zero
+                     *          2 : Positive number
+                     *         -2 : Negative number
+                     *          3 : Positive infinite number
+                     *         -3 : Negative infinite number
+                     */
+    short  flag;    /* Not used in vp_routines,space for user.  */
+    U_LONG frac[1]; /* Pointer to array of fraction part.       */
+} Real;
+
+/*  
+ *  ------------------
+ *   EXPORTables.
+ *  ------------------
+ */
+
+VP_EXPORT  Real *
+VpNewRbClass(U_LONG mx,char *str,VALUE klass);
+
+VP_EXPORT  Real *VpCreateRbObject(U_LONG mx,char *str);
+
+VP_EXPORT U_LONG VpBaseFig(void);
+VP_EXPORT U_LONG VpDblFig(void);
+VP_EXPORT U_LONG VpBaseVal(void);
+
+/* Zero,Inf,NaN (isinf(),isnan() used to check) */
+VP_EXPORT double VpGetDoubleNaN(void);
+VP_EXPORT double VpGetDoublePosInf(void);
+VP_EXPORT double VpGetDoubleNegInf(void);
+VP_EXPORT double VpGetDoubleNegZero(void);
+
+/* These 2 functions added at v1.1.7 */
+VP_EXPORT U_LONG VpGetPrecLimit(void);
+VP_EXPORT U_LONG VpSetPrecLimit(U_LONG n);
+
+VP_EXPORT int VpException(unsigned short f,char *str,int always);
+VP_EXPORT int VpIsNegDoubleZero(double v);
+VP_EXPORT U_LONG VpNumOfChars(Real *vp);
+VP_EXPORT U_LONG VpInit(U_LONG BaseVal);
+VP_EXPORT void *VpMemAlloc(U_LONG mb);
+VP_EXPORT void VpFree(Real *pv);
+VP_EXPORT Real *VpAlloc(U_LONG mx, char *szVal);
+VP_EXPORT int VpAsgn(Real *c,Real *a,int isw);
+VP_EXPORT int VpAddSub(Real *c,Real *a,Real *b,int operation);
+VP_EXPORT int VpMult(Real *c,Real *a,Real *b);
+VP_EXPORT int VpDivd(Real *c,Real *r,Real *a,Real *b);
+VP_EXPORT int VpComp(Real *a,Real *b);
+VP_EXPORT S_LONG VpExponent10(Real *a);
+VP_EXPORT void VpSzMantissa(Real *a,char *psz);
+VP_EXPORT void VpToString(Real *a,char *psz,int fFmt);
+VP_EXPORT int VpCtoV(Real *a,char *int_chr,U_LONG ni,char *frac,U_LONG nf,char *exp_chr,U_LONG ne);
+VP_EXPORT void VpVtoD(double *d,S_LONG *e,Real *m);
+VP_EXPORT void VpDtoV(Real *m,double d);
+VP_EXPORT void VpItoV(Real *m,S_INT ival);
+VP_EXPORT int VpSqrt(Real *y,Real *x);
+VP_EXPORT void VpRound(Real *y,Real *x,int sw,int f,int il);
+VP_EXPORT void VpFrac(Real *y,Real *x);
+VP_EXPORT int VpPower(Real *y,Real *x,S_INT n);
+VP_EXPORT void VpPai(Real *y);
+VP_EXPORT void VpExp1(Real *y);
+VP_EXPORT void VpExp(Real *y,Real *x);
+VP_EXPORT void VpSinCos(Real *psin,Real *pcos,Real *x);
+VP_EXPORT int VPrint(FILE *fp,char *cntl_chr,Real *a);
+
+/*  
+ *  ------------------
+ *  MACRO definitions.
+ *  ------------------
+ */
+#define Abs(a)     (((a)>= 0)?(a):(-(a)))
+#define Max(a, b)  (((a)>(b))?(a):(b))
+#define Min(a, b)  (((a)>(b))?(b):(a))
+
+#define IsWhiteChar(ch) (((ch==' ')||(ch=='\n')||(ch=='\t')||(ch=='\b'))?1:0)
+
+#define VpMaxPrec(a)   ((a)->MaxPrec)
+#define VpPrec(a)      ((a)->Prec)
+#define VpGetFlag(a)   ((a)->flag)
+
+/* Sign */
+
+/* VpGetSign(a) returns 1,-1 if a>0,a<0 respectively */
+#define VpGetSign(a) (((a)->sign>0)?1:(-1))
+/* Change sign of a to a>0,a<0 if s = 1,-1 respectively */
+#define VpChangeSign(a,s) {if((s)>0) (a)->sign=(short)Abs((S_LONG)(a)->sign);else (a)->sign=-(short)Abs((S_LONG)(a)->sign);}
+/* Sets sign of a to a>0,a<0 if s = 1,-1 respectively */
+#define VpSetSign(a,s)    {if((s)>0) (a)->sign=(short)VP_SIGN_POSITIVE_FINITE;else (a)->sign=(short)VP_SIGN_NEGATIVE_FINITE;}
+
+/* 1 */
+#define VpSetOne(a)       {(a)->frac[0]=(a)->exponent=(a)->Prec=1;(a)->sign=VP_SIGN_POSITIVE_FINITE;}
+
+/* ZEROs */
+#define VpIsPosZero(a)  ((a)->sign==VP_SIGN_POSITIVE_ZERO)
+#define VpIsNegZero(a)  ((a)->sign==VP_SIGN_NEGATIVE_ZERO)
+#define VpIsZero(a)     (VpIsPosZero(a) || VpIsNegZero(a))
+#define VpSetPosZero(a) ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_POSITIVE_ZERO)
+#define VpSetNegZero(a) ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_NEGATIVE_ZERO)
+#define VpSetZero(a,s)  ( ((s)>0)?VpSetPosZero(a):VpSetNegZero(a) )
+
+/* NaN */
+#define VpIsNaN(a)      ((a)->sign==VP_SIGN_NaN)
+#define VpSetNaN(a)     ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_NaN)
+
+/* Infinity */
+#define VpIsPosInf(a)   ((a)->sign==VP_SIGN_POSITIVE_INFINITE)
+#define VpIsNegInf(a)   ((a)->sign==VP_SIGN_NEGATIVE_INFINITE)
+#define VpIsInf(a)      (VpIsPosInf(a) || VpIsNegInf(a))
+#define VpIsDef(a)      ( !(VpIsNaN(a)||VpIsInf(a)) )
+#define VpSetPosInf(a)  ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_POSITIVE_INFINITE)
+#define VpSetNegInf(a)  ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_NEGATIVE_INFINITE)
+#define VpSetInf(a,s)   ( ((s)>0)?VpSetPosInf(a):VpSetNegInf(a) )
+
+#ifdef _DEBUG
+int VpVarCheck(Real * v);
+#endif /* _DEBUG */
+
+#if defined(__cplusplus)
+}  /* extern "C" { */
+#endif
+#endif //____BIG_DECIMAL__H____