[tyndur-devel] [PATCH] libm: pow() und rint() für libvorbis

[max@xxxxxxxxxx]

From: Max Reitz <max@xxxxxxxxxx>

+ pow() und rint() so dürftig als nötig hinzugefügt, damit die
  libvorbis funktioniert

Signed-off-by: Max Reitz <max@xxxxxxxxxx>
---
 src/modules/include/math.h          |    3 +++
 src/modules/lib/stdlibc/math/pow.c  |   35 +++++++++++++++++++++++++++++++++++
 src/modules/lib/stdlibc/math/rint.c |   34 ++++++++++++++++++++++++++++++++++
 3 files changed, 72 insertions(+), 0 deletions(-)
 create mode 100644 src/modules/lib/stdlibc/math/pow.c
 create mode 100644 src/modules/lib/stdlibc/math/rint.c

diff --git a/src/modules/include/math.h b/src/modules/include/math.h
index 1cbb54f..486e21e 100644
--- a/src/modules/include/math.h
+++ b/src/modules/include/math.h
@@ -110,5 +110,8 @@ double      nearbyint(double x);
 float       nearbyintf(float x);
 long double nearbyintl(long double x);
 
+double      rint(double x);
+double      pow(double x, double y);
+
 #endif
 
diff --git a/src/modules/lib/stdlibc/math/pow.c b/src/modules/lib/stdlibc/math/pow.c
new file mode 100644
index 0000000..b1f791a
--- /dev/null
+++ b/src/modules/lib/stdlibc/math/pow.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2009 The tyndur Project. All rights reserved.
+ *
+ * This code is derived from software contributed to the tyndur Project
+ * by Max Reitz.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <math.h>
+
+double pow(double x, double y)
+{
+    return exp(y * log(x));
+}
+
diff --git a/src/modules/lib/stdlibc/math/rint.c b/src/modules/lib/stdlibc/math/rint.c
new file mode 100644
index 0000000..0b81d87
--- /dev/null
+++ b/src/modules/lib/stdlibc/math/rint.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2009 The tyndur Project. All rights reserved.
+ *
+ * This code is derived from software contributed to the tyndur Project
+ * by Max Reitz.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+double rint(double x)
+{
+    //FIXME Was ist mit sehr großen Zahlen?
+    return (double)(unsigned long long)(x + 0.5);
+}
+
-- 
1.6.3.3