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1 files changed, 77 insertions, 0 deletions

diff --git a/gas/bignum-copy.c b/gas/bignum-copy.c
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+/* bignum_copy.c - copy a bignum
+   Copyright (C) 1987, 1990, 1991 Free Software Foundation, Inc.
+
+This file is part of GAS, the GNU Assembler.
+
+GAS 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 1, or (at your option)
+any later version.
+
+GAS 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 GAS; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* static const char rcsid[] = "$Id$"; */
+
+#include "as.h"
+
+#ifdef USG
+#define bzero(s,n) memset(s,0,n)
+#define bcopy(from,to,n) memcpy(to,from,n)
+#endif
+
+/*
+ *			bignum_copy ()
+ *
+ * Copy a bignum from in to out.
+ * If the output is shorter than the input, copy lower-order littlenums.
+ * Return 0 or the number of significant littlenums dropped.
+ * Assumes littlenum arrays are densely packed: no unused chars between
+ * the littlenums. Uses bcopy() to move littlenums, and wants to
+ * know length (in chars) of the input bignum.
+ */
+
+/* void */
+int
+bignum_copy (in, in_length, out, out_length)
+     register LITTLENUM_TYPE *	in;
+     register int		in_length; /* in sizeof(littlenum)s */
+     register LITTLENUM_TYPE *	out;
+     register int		out_length; /* in sizeof(littlenum)s */
+{
+  register int	significant_littlenums_dropped;
+
+  if (out_length < in_length)
+    {
+      register LITTLENUM_TYPE *	p; /* -> most significant (non-zero) input littlenum. */
+
+      bcopy ((char *)in, (char *)out, out_length << LITTLENUM_SHIFT);
+      for (p = in + in_length - 1;   p >= in;   -- p)
+	{
+	  if (* p) break;
+	}
+      significant_littlenums_dropped = p - in - in_length + 1;
+      if (significant_littlenums_dropped < 0)
+	{
+	  significant_littlenums_dropped = 0;
+	}
+    }
+  else
+    {
+      bcopy ((char *)in, (char *)out, in_length << LITTLENUM_SHIFT);
+      if (out_length > in_length)
+	{
+	  bzero ((char *)(out + out_length), (out_length - in_length) << LITTLENUM_SHIFT);
+	}
+      significant_littlenums_dropped = 0;
+    }
+  return (significant_littlenums_dropped);
+}
+
+/* end: bignum_copy.c */