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db_include/common/shortest_dec.h

@@ -0,0 +1,63 @@
+/*---------------------------------------------------------------------------
+ *
+ * Ryu floating-point output.
+ *
+ * Portions Copyright (c) 2018-2021, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *	  src/include/common/shortest_dec.h
+ *
+ * This is a modification of code taken from github.com/ulfjack/ryu under the
+ * terms of the Boost license (not the Apache license). The original copyright
+ * notice follows:
+ *
+ * Copyright 2018 Ulf Adams
+ *
+ * The contents of this file may be used under the terms of the Apache
+ * License, Version 2.0.
+ *
+ *     (See accompanying file LICENSE-Apache or copy at
+ *      http://www.apache.org/licenses/LICENSE-2.0)
+ *
+ * Alternatively, the contents of this file may be used under the terms of the
+ * Boost Software License, Version 1.0.
+ *
+ *     (See accompanying file LICENSE-Boost or copy at
+ *      https://www.boost.org/LICENSE_1_0.txt)
+ *
+ * Unless required by applicable law or agreed to in writing, this software is
+ * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.
+ *
+ *---------------------------------------------------------------------------
+ */
+#ifndef SHORTEST_DEC_H
+#define SHORTEST_DEC_H
+
+/*----
+ * The length of 25 comes from:
+ *
+ * Case 1: -9.9999999999999999e-299  = 24 bytes, plus 1 for null
+ *
+ * Case 2: -0.00099999999999999999   = 23 bytes, plus 1 for null
+ */
+#define DOUBLE_SHORTEST_DECIMAL_LEN 25
+
+int			double_to_shortest_decimal_bufn(double f, char *result);
+int			double_to_shortest_decimal_buf(double f, char *result);
+char	   *double_to_shortest_decimal(double f);
+
+/*
+ * The length of 16 comes from:
+ *
+ * Case 1: -9.99999999e+29  = 15 bytes, plus 1 for null
+ *
+ * Case 2: -0.000999999999  = 15 bytes, plus 1 for null
+ */
+#define FLOAT_SHORTEST_DECIMAL_LEN 16
+
+int			float_to_shortest_decimal_bufn(float f, char *result);
+int			float_to_shortest_decimal_buf(float f, char *result);
+char	   *float_to_shortest_decimal(float f);
+
+#endif							/* SHORTEST_DEC_H */