Use sprintf() to convert float8 to a string during conversion to numeric.

Thomas G. Lockhart · Thomas G. Lockhart · commit 84e832a80273 · 1999-05-04T15:50:24.000Z
Original code used float8out(), but the resulting exponential notation
 was not handled (e.g. '3E9' was decoded as '3').
diff --git a/src/backend/utils/adt/numeric.c b/src/backend/utils/adt/numeric.c
@@ -5,7 +5,7 @@
  *
  *	1998 Jan Wieck
  *
- * $Header: /cvsroot/pgsql/src/backend/utils/adt/numeric.c,v 1.11 1999/03/14 16:49:32 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/numeric.c,v 1.12 1999/05/04 15:50:24 thomas Exp $
  *
  * ----------
  */
@@ -1693,7 +1693,7 @@ float8_numeric(float64 val)
 {
 	Numeric		res;
 	NumericVar	result;
-	char		*tmp;
+	char		buf[512];
 
 	if (val == NULL)
 		return NULL;
@@ -1703,12 +1703,11 @@ float8_numeric(float64 val)
 
 	init_var(&result);
 
-	tmp = float8out(val);
-	set_var_from_str(tmp, &result);
+	sprintf(buf, "%f", *val);
+	set_var_from_str(buf, &result);
 	res = make_result(&result);
 
 	free_var(&result);
-	pfree(tmp);
 
 	return res;
 }

Original file line number	Diff line number	Diff line change
`@@ -5,7 +5,7 @@`
`5`	`5`	`*`
`6`	`6`	`* 1998 Jan Wieck`
`7`	`7`	`*`
`8`		`- * $Header: /cvsroot/pgsql/src/backend/utils/adt/numeric.c,v 1.11 1999/03/14 16:49:32 momjian Exp $`
	`8`	`+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/numeric.c,v 1.12 1999/05/04 15:50:24 thomas Exp $`
`9`	`9`	`*`
`10`	`10`	`* ----------`
`11`	`11`	`*/`
`@@ -1693,7 +1693,7 @@ float8_numeric(float64 val)`
`1693`	`1693`	`{`
`1694`	`1694`	`Numeric res;`
`1695`	`1695`	`NumericVar result;`
`1696`		`- char *tmp;`
	`1696`	`+ char buf[512];`
`1697`	`1697`
`1698`	`1698`	`if (val == NULL)`
`1699`	`1699`	`return NULL;`
`@@ -1703,12 +1703,11 @@ float8_numeric(float64 val)`
`1703`	`1703`
`1704`	`1704`	`init_var(&result);`
`1705`	`1705`
`1706`		`- tmp = float8out(val);`
`1707`		`- set_var_from_str(tmp, &result);`
	`1706`	`+ sprintf(buf, "%f", *val);`
	`1707`	`+ set_var_from_str(buf, &result);`
`1708`	`1708`	`res = make_result(&result);`
`1709`	`1709`
`1710`	`1710`	`free_var(&result);`
`1711`		`- pfree(tmp);`
`1712`	`1711`
`1713`	`1712`	`return res;`
`1714`	`1713`	`}`