md5, sha1, sha256, sha512: add gl_SET_CRYPTO_CHECK_DEFAULT

[gnulib.git] / lib / frexp.c

diff --git a/lib/frexp.c b/lib/frexp.c
index 251a932..d847fa3 100644 (file)
--- a/lib/frexp.c
+++ b/lib/frexp.c
@@ -1,24 +1,25 @@
 /* Split a double into fraction and mantissa.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+   Copyright (C) 2007-2013 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   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.
+   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 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.  */
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Written by Paolo Bonzini <bonzini@gnu.org>, 2003, and
    Bruno Haible <bruno@clisp.org>, 2007.  */
 
-#include <config.h>
+#if ! defined USE_LONG_DOUBLE
+# include <config.h>
+#endif
 
 /* Specification.  */
 #include <math.h>
@@ -28,7 +29,7 @@
 # include "isnanl-nolibm.h"
 # include "fpucw.h"
 #else
-# include "isnan.h"
+# include "isnand-nolibm.h"
 #endif
 
 /* This file assumes FLT_RADIX = 2.  If FLT_RADIX is a power of 2 greater
@@ -46,7 +47,7 @@
 #else
 # define FUNC frexp
 # define DOUBLE double
-# define ISNAN isnan
+# define ISNAN isnand
 # define DECL_ROUNDING
 # define BEGIN_ROUNDING()
 # define END_ROUNDING()
@@ -54,7 +55,7 @@
 #endif
 
 DOUBLE
-FUNC (DOUBLE x, int *exp)
+FUNC (DOUBLE x, int *expptr)
 {
   int sign;
   int exponent;
@@ -63,7 +64,7 @@ FUNC (DOUBLE x, int *exp)
   /* Test for NaN, infinity, and zero.  */
   if (ISNAN (x) || x + x == x)
     {
-      *exp = 0;
+      *expptr = 0;
       return x;
     }
 
@@ -86,73 +87,73 @@ FUNC (DOUBLE x, int *exp)
     exponent = 0;
     if (x >= L_(1.0))
       {
-       /* A positive exponent.  */
-       DOUBLE pow2_i; /* = pow2[i] */
-       DOUBLE powh_i; /* = powh[i] */
-
-       /* Invariants: pow2_i = 2^2^i, powh_i = 2^-2^i,
-          x * 2^exponent = argument, x >= 1.0.  */
-       for (i = 0, pow2_i = L_(2.0), powh_i = L_(0.5);
-            ;
-            i++, pow2_i = pow2_i * pow2_i, powh_i = powh_i * powh_i)
-         {
-           if (x >= pow2_i)
-             {
-               exponent += (1 << i);
-               x *= powh_i;
-             }
-           else
-             break;
-
-           pow2[i] = pow2_i;
-           powh[i] = powh_i;
-         }
-       /* Avoid making x too small, as it could become a denormalized
-          number and thus lose precision.  */
-       while (i > 0 && x < pow2[i - 1])
-         {
-           i--;
-           powh_i = powh[i];
-         }
-       exponent += (1 << i);
-       x *= powh_i;
-       /* Here 2^-2^i <= x < 1.0.  */
+        /* A positive exponent.  */
+        DOUBLE pow2_i; /* = pow2[i] */
+        DOUBLE powh_i; /* = powh[i] */
+
+        /* Invariants: pow2_i = 2^2^i, powh_i = 2^-2^i,
+           x * 2^exponent = argument, x >= 1.0.  */
+        for (i = 0, pow2_i = L_(2.0), powh_i = L_(0.5);
+             ;
+             i++, pow2_i = pow2_i * pow2_i, powh_i = powh_i * powh_i)
+          {
+            if (x >= pow2_i)
+              {
+                exponent += (1 << i);
+                x *= powh_i;
+              }
+            else
+              break;
+
+            pow2[i] = pow2_i;
+            powh[i] = powh_i;
+          }
+        /* Avoid making x too small, as it could become a denormalized
+           number and thus lose precision.  */
+        while (i > 0 && x < pow2[i - 1])
+          {
+            i--;
+            powh_i = powh[i];
+          }
+        exponent += (1 << i);
+        x *= powh_i;
+        /* Here 2^-2^i <= x < 1.0.  */
       }
     else
       {
-       /* A negative or zero exponent.  */
-       DOUBLE pow2_i; /* = pow2[i] */
-       DOUBLE powh_i; /* = powh[i] */
-
-       /* Invariants: pow2_i = 2^2^i, powh_i = 2^-2^i,
-          x * 2^exponent = argument, x < 1.0.  */
-       for (i = 0, pow2_i = L_(2.0), powh_i = L_(0.5);
-            ;
-            i++, pow2_i = pow2_i * pow2_i, powh_i = powh_i * powh_i)
-         {
-           if (x < powh_i)
-             {
-               exponent -= (1 << i);
-               x *= pow2_i;
-             }
-           else
-             break;
-
-           pow2[i] = pow2_i;
-           powh[i] = powh_i;
-         }
-       /* Here 2^-2^i <= x < 1.0.  */
+        /* A negative or zero exponent.  */
+        DOUBLE pow2_i; /* = pow2[i] */
+        DOUBLE powh_i; /* = powh[i] */
+
+        /* Invariants: pow2_i = 2^2^i, powh_i = 2^-2^i,
+           x * 2^exponent = argument, x < 1.0.  */
+        for (i = 0, pow2_i = L_(2.0), powh_i = L_(0.5);
+             ;
+             i++, pow2_i = pow2_i * pow2_i, powh_i = powh_i * powh_i)
+          {
+            if (x < powh_i)
+              {
+                exponent -= (1 << i);
+                x *= pow2_i;
+              }
+            else
+              break;
+
+            pow2[i] = pow2_i;
+            powh[i] = powh_i;
+          }
+        /* Here 2^-2^i <= x < 1.0.  */
       }
 
     /* Invariants: x * 2^exponent = argument, and 2^-2^i <= x < 1.0.  */
     while (i > 0)
       {
-       i--;
-       if (x < powh[i])
-         {
-           exponent -= (1 << i);
-           x *= pow2[i];
-         }
+        i--;
+        if (x < powh[i])
+          {
+            exponent -= (1 << i);
+            x *= pow2[i];
+          }
       }
     /* Here 0.5 <= x < 1.0.  */
   }
@@ -162,6 +163,6 @@ FUNC (DOUBLE x, int *exp)
 
   END_ROUNDING ();
 
-  *exp = exponent;
+  *expptr = exponent;
   return x;
 }