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+/* Split a double into fraction and mantissa, for hexadecimal printf.
+ Copyright (C) 2007 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Write a finite, positive number x as
+ x = mantissa * 2^exp
+ where exp >= DBL_MIN_EXP - 1,
+ mantissa < 2.0,
+ if x is not a denormalized number then mantissa >= 1.0.
+ Store exp in *EXPPTR and return mantissa. */
+extern double printf_frexp (double x, int *expptr);