1 files changed, 76 insertions, 0 deletions
diff --git a/gnu/usr.bin/as/bignum-copy.c b/gnu/usr.bin/as/bignum-copy.c
new file mode 100644
index 000000000000..983de6d89623
--- /dev/null
+++ b/gnu/usr.bin/as/bignum-copy.c
@@ -0,0 +1,76 @@
+/* bignum_copy.c - copy a bignum
+   Copyright (C) 1987, 1990, 1991, 1992 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 2, 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. */
+
+#ifndef lint
+static char rcsid[] = "$Id: bignum-copy.c,v 1.2 1993/11/03 00:51:16 paul Exp $";
+#endif
+
+#include "as.h"
+
+/*
+ *			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 memcpy() 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 */
+{
+	int significant_littlenums_dropped;
+	
+	if (out_length < in_length) {
+		LITTLENUM_TYPE *p; /* -> most significant (non-zero) input
+				      littlenum. */ 
+		
+		memcpy((void *) out, (void *) in,
+		      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 {
+		memcpy((char *) out, (char *) in,
+		      in_length << LITTLENUM_SHIFT);
+
+		if (out_length > in_length) {
+			memset((char *) (out + out_length),
+			      '\0', (out_length - in_length) << LITTLENUM_SHIFT);
+		}
+
+		significant_littlenums_dropped = 0;
+	}
+	
+	return(significant_littlenums_dropped);
+} /* bignum_copy() */
+
+/* end of bignum-copy.c */