New module 'printf-frexpl'.

[gnulib.git] / lib / printf-frexpl.h

diff --git a/lib/printf-frexpl.h b/lib/printf-frexpl.h
new file mode 100644 (file)
index 0000000..cf49689
--- /dev/null
+++ b/lib/printf-frexpl.h
@@ -0,0 +1,24 @@
+/* Split a 'long 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 General Public License as published by
+   the Free Software Foundation; either version 2, 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Write a finite, positive number x as
+     x = mantissa * 2^exp
+   where exp >= LDBL_MIN_EXP - 1,
+         mantissa < 2.0,
+         if x is not a denormalized number then mantissa >= 1.0.
+   Store exp and return mantissa.  */
+extern long double printf_frexpl (long double x, int *exp);