Merge pull request #13 from ProjectRevoTPP/libc

add libc building to agbcc.

1 files changed, 82 insertions, 0 deletions

diff --git a/libc/math/s_copysign.c b/libc/math/s_copysign.c
new file mode 100644
index 0000000..bfc546d
--- /dev/null
+++ b/libc/math/s_copysign.c
@@ -0,0 +1,82 @@
+
+/* @(#)s_copysign.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+/*
+FUNCTION
+<<copysign>>, <<copysignf>>---sign of <[y]>, magnitude of <[x]>
+
+INDEX
+	copysign
+INDEX
+	copysignf
+
+ANSI_SYNOPSIS
+	#include <math.h>
+	double copysign (double <[x]>, double <[y]>);
+	float copysignf (float <[x]>, float <[y]>);
+
+TRAD_SYNOPSIS
+	#include <math.h>
+	double copysign (<[x]>, <[y]>)
+	double <[x]>;
+	double <[y]>;
+
+	float copysignf (<[x]>, <[y]>)
+	float <[x]>;
+	float <[y]>;
+
+DESCRIPTION
+<<copysign>> constructs a number with the magnitude (absolute value)
+of its first argument, <[x]>, and the sign of its second argument,
+<[y]>.
+
+<<copysignf>> does the same thing; the two functions differ only in
+the type of their arguments and result.
+
+RETURNS
+<<copysign>> returns a <<double>> with the magnitude of
+<[x]> and the sign of <[y]>.
+<<copysignf>> returns a <<float>> with the magnitude of
+<[x]> and the sign of <[y]>.
+
+PORTABILITY
+<<copysign>> is not required by either ANSI C or the System V Interface
+Definition (Issue 2).
+
+*/
+
+/*
+ * copysign(double x, double y)
+ * copysign(x,y) returns a value with the magnitude of x and
+ * with the sign bit of y.
+ */
+
+#include "fdlibm.h"
+
+#ifndef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double copysign(double x, double y)
+#else
+	double copysign(x,y)
+	double x,y;
+#endif
+{
+	__uint32_t hx,hy;
+	GET_HIGH_WORD(hx,x);
+	GET_HIGH_WORD(hy,y);
+	SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
+        return x;
+}
+
+#endif /* _DOUBLE_IS_32BITS */