--- old/postgresql-7.2.1/src/backend/utils/adt/float.c  Tue Dec 11 02:02:12 2001
+++ postgresql-7.2.1/src/backend/utils/adt/float.c      Mon Nov  4 15:50:19 2002
@@ -65,6 +65,11 @@
 #include "utils/array.h"
 #include "utils/builtins.h"
 
+/*
+ *     Configuration options for float4 and float8 extra digits in output format
+ */
+
+int extra_float_digits;
 
 #if !(NeXT && NX_CURRENT_COMPILER_RELEASE > NX_COMPILER_RELEASE_3_2)
  /* NS3.3 has conflicting declarations of these in <math.h> */
@@ -228,6 +233,7 @@
        float4          num = PG_GETARG_FLOAT4(0);
        char       *ascii = (char *) palloc(MAXFLOATWIDTH + 1);
        int                     infflag;
+       int     ndig = FLT_DIG + extra_float_digits;
 
        if (isnan(num))
                PG_RETURN_CSTRING(strcpy(ascii, "NaN"));
@@ -237,7 +243,10 @@
        if (infflag < 0)
                PG_RETURN_CSTRING(strcpy(ascii, "-Infinity"));
 
-       sprintf(ascii, "%.*g", FLT_DIG, num);
+       if (ndig < 1)
+         ndig = 1;
+
+       sprintf(ascii, "%.*g", ndig, num);
        PG_RETURN_CSTRING(ascii);
 }
 
@@ -290,6 +299,7 @@
        float8          num = PG_GETARG_FLOAT8(0);
        char       *ascii = (char *) palloc(MAXDOUBLEWIDTH + 1);
        int                     infflag;
+       int     ndig = DBL_DIG + extra_float_digits;
 
        if (isnan(num))
                PG_RETURN_CSTRING(strcpy(ascii, "NaN"));
@@ -299,7 +309,10 @@
        if (infflag < 0)
                PG_RETURN_CSTRING(strcpy(ascii, "-Infinity"));
 
-       sprintf(ascii, "%.*g", DBL_DIG, num);
+        if (ndig < 1)
+               ndig = 1;
+
+       sprintf(ascii, "%.*g", ndig, num);
        PG_RETURN_CSTRING(ascii);
 }