19990502 sourceware importbinu_ss_19990502

1 files changed, 80 insertions, 0 deletions

diff --git a/gas/bignum-copy.c b/gas/bignum-copy.c
new file mode 100644
index 0000000..2bffcbf
--- /dev/null
+++ b/gas/bignum-copy.c
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+/* 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#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,
+	      (unsigned int) 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,
+	      (unsigned int) in_length << LITTLENUM_SHIFT);
+
+      if (out_length > in_length)
+	{
+	  memset ((char *) (out + in_length),
+		  '\0',
+		  (unsigned int) (out_length - in_length) << LITTLENUM_SHIFT);
+	}
+
+      significant_littlenums_dropped = 0;
+    }
+
+  return (significant_littlenums_dropped);
+}				/* bignum_copy() */
+
+/* end of bignum-copy.c */