altos: Add floating point math functions from newlib

These are all BSD licensed, so we can simply include them directly

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/src/math/sf_fabs.c b/src/math/sf_fabs.c
new file mode 100644
index 00000000..2aaed326
--- /dev/null
+++ b/src/math/sf_fabs.c
@@ -0,0 +1,47 @@
+/* sf_fabs.c -- float version of s_fabs.c.
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
+ */
+
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice 
+ * is preserved.
+ * ====================================================
+ */
+
+/*
+ * fabsf(x) returns the absolute value of x.
+ */
+
+#include "fdlibm.h"
+
+#ifdef __STDC__
+	float fabsf(float x)
+#else
+	float fabsf(x)
+	float x;
+#endif
+{
+	__uint32_t ix;
+	GET_FLOAT_WORD(ix,x);
+	SET_FLOAT_WORD(x,ix&0x7fffffff);
+        return x;
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double fabs(double x)
+#else
+	double fabs(x)
+	double x;
+#endif
+{
+	return (double) fabsf((float) x);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */