Tests for module 'printf-frexpl'.

diff --git a/ChangeLog b/ChangeLog
index 67cc44824b0b589c49333ed80f16917a37b19ecb..93910c17f47ac408dd6c0654dd500e862ef9343c 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2007-02-25  Bruno Haible  <bruno@clisp.org>
 
+       * modules/printf-frexpl-tests: New file.
+       * tests/test-printf-frexpl.c: New file.
+
        * modules/printf-frexpl: New file.
        * lib/printf-frexpl.h: New file.
        * lib/printf-frexpl.c: New file.

diff --git a/modules/printf-frexpl-tests b/modules/printf-frexpl-tests
new file mode 100644 (file)
index 0000000..ab58971
--- /dev/null
+++ b/modules/printf-frexpl-tests
@@ -0,0 +1,13 @@
+Files:
+tests/test-printf-frexpl.c
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-printf-frexpl
+check_PROGRAMS += test-printf-frexpl
+
+License:
+LGPL

diff --git a/tests/test-printf-frexpl.c b/tests/test-printf-frexpl.c
new file mode 100644 (file)
index 0000000..32c92e8
--- /dev/null
+++ b/tests/test-printf-frexpl.c
@@ -0,0 +1,116 @@
+/* Test of splitting a 'long double' into fraction and mantissa.
+   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.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
+
+#include <config.h>
+
+#include "printf-frexpl.h"
+
+#include <float.h>
+#include <stdlib.h>
+
+#define ASSERT(expr) if (!(expr)) abort ();
+
+static long double
+my_ldexp (long double x, int d)
+{
+  for (; d > 0; d--)
+    x *= 2.0L;
+  for (; d < 0; d++)
+    x *= 0.5L;
+  return x;
+}
+
+int
+main ()
+{
+  int i;
+  long double x;
+
+  for (i = 1, x = 1.0L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
+    {
+      int exp = -9999;
+      long double mantissa = printf_frexpl (x, &exp);
+      ASSERT (exp == i - 1);
+      ASSERT (mantissa == 1.0L);
+    }
+  for (i = 1, x = 1.0L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+    {
+      int exp = -9999;
+      long double mantissa = printf_frexpl (x, &exp);
+      ASSERT (exp == i - 1);
+      ASSERT (mantissa == 1.0L);
+    }
+  for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
+    {
+      int exp = -9999;
+      long double mantissa = printf_frexpl (x, &exp);
+      ASSERT (exp == LDBL_MIN_EXP - 1);
+      ASSERT (mantissa == my_ldexp (1.0L, i - LDBL_MIN_EXP));
+    }
+
+  for (i = 1, x = 1.01L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
+    {
+      int exp = -9999;
+      long double mantissa = printf_frexpl (x, &exp);
+      ASSERT (exp == i - 1);
+      ASSERT (mantissa == 1.01L);
+    }
+  for (i = 1, x = 1.01L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+    {
+      int exp = -9999;
+      long double mantissa = printf_frexpl (x, &exp);
+      ASSERT (exp == i - 1);
+      ASSERT (mantissa == 1.01L);
+    }
+  for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
+    {
+      int exp = -9999;
+      long double mantissa = printf_frexpl (x, &exp);
+      ASSERT (exp == LDBL_MIN_EXP - 1);
+      ASSERT (mantissa >= my_ldexp (1.0L, i - LDBL_MIN_EXP));
+      ASSERT (mantissa <= my_ldexp (2.0L, i - LDBL_MIN_EXP));
+      ASSERT (mantissa == my_ldexp (x, - exp));
+    }
+
+  for (i = 1, x = 1.73205L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
+    {
+      int exp = -9999;
+      long double mantissa = printf_frexpl (x, &exp);
+      ASSERT (exp == i - 1);
+      ASSERT (mantissa == 1.73205L);
+    }
+  for (i = 1, x = 1.73205L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+    {
+      int exp = -9999;
+      long double mantissa = printf_frexpl (x, &exp);
+      ASSERT (exp == i - 1);
+      ASSERT (mantissa == 1.73205L);
+    }
+  for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
+    {
+      int exp = -9999;
+      long double mantissa = printf_frexpl (x, &exp);
+      ASSERT (exp == LDBL_MIN_EXP - 1);
+      ASSERT (mantissa >= my_ldexp (1.0L, i - LDBL_MIN_EXP));
+      ASSERT (mantissa <= my_ldexp (2.0L, i - LDBL_MIN_EXP));
+      ASSERT (mantissa == my_ldexp (x, - exp));
+    }
+
+  return 0;
+}