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authorRoland McGrath <roland@gnu.org>1995-03-21 07:58:50 +0000
committerRoland McGrath <roland@gnu.org>1995-03-21 07:58:50 +0000
commit49e522bfb8642bb31afc2a119b2538a6a6465996 (patch)
tree4301902f9aa76f21271ab04697fcc107c58f2a43 /stdlib/fpioconst.h
parent6bf028786c61b3b1e98d34557c5c442c2f954526 (diff)
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Tue Mar 21 00:14:27 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
* locale/loadlocale.c (_nl_load_locale): If LOCALE/LC_* is a directory, open LOCALE/LC_*/SYS_LC_* instead. * stdio/fpioconst.c, stdio/fpioconst.h, stdio/gmp-impl.h, stdio/gmp.h, stdio/longlong.h, stdio/mp_clz_tab.c, stdio/gen-mpn-copy: Files moved to stdlib. * stdio/Makefile: All mpn stuff moved to stdlib/Makefile. * stdio/printf_fp.c: Use ../stdlib to find fpioconst.h and gmp headers. * stdlib/strtod.c: Don't use ../stdio to find fpioconst.h and gmp headers.
Diffstat (limited to 'stdlib/fpioconst.h')
-rw-r--r--stdlib/fpioconst.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/stdlib/fpioconst.h b/stdlib/fpioconst.h
new file mode 100644
index 0000000..8edbdcc
--- /dev/null
+++ b/stdlib/fpioconst.h
@@ -0,0 +1,52 @@
+/* Header file for constants used in floating point <-> decimal conversions.
+Copyright (C) 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#ifndef _FPIOCONST_H
+#define _FPIOCONST_H
+
+#include <float.h>
+#include "gmp.h"
+
+
+/* These values are used by __printf_fp, where they are noncritical (if the
+ value is not large enough, it will just be slower); and by
+ strtof/strtod/strtold, where it is critical (it's used for overflow
+ detection).
+
+ XXX These should be defined in <float.h>. For the time being, we have the
+ IEEE754 values here. */
+
+#define LDBL_MAX_10_EXP_LOG 12 /* = floor(log_2(LDBL_MAX_10_EXP)) */
+#define DBL_MAX_10_EXP_LOG 8 /* = floor(log_2(DBL_MAX_10_EXP)) */
+#define FLT_MAX_10_EXP_LOG 5 /* = floor(log_2(FLT_MAX_10_EXP)) */
+
+
+/* Table of powers of ten. This is used by __printf_fp and by
+ strtof/strtod/strtold. */
+struct mp_power
+ {
+ const mp_limb *array; /* The array with the number representation. */
+ mp_size_t arraysize; /* Size of the array. */
+ int p_expo; /* Exponent of the number 10^(2^i). */
+ int m_expo; /* Exponent of the number 10^-(2^i-1). */
+ };
+extern const struct mp_power _fpioconst_pow10[LDBL_MAX_10_EXP_LOG + 1];
+
+
+#endif /* fpioconst.h */