[project @ 1998-06-05 14:38:01 by simonm]

[ghc-hetmet.git] / ghc / rts / gmp / mpz / out_raw.c

diff --git a/ghc/rts/gmp/mpz/out_raw.c b/ghc/rts/gmp/mpz/out_raw.c
new file mode 100644 (file)
index 0000000..35d311b
--- /dev/null
+++ b/ghc/rts/gmp/mpz/out_raw.c
@@ -0,0 +1,89 @@
+/* mpz_out_raw -- Output a mpz_t in binary.  Use an endianess and word size
+   independent format.
+
+Copyright (C) 1995 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Library General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at your
+option) any later version.
+
+The GNU MP Library 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 Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library General Public License
+along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include <stdio.h>
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+size_t
+#if __STDC__
+mpz_out_raw (FILE *stream, mpz_srcptr x)
+#else
+mpz_out_raw (stream, x)
+     FILE *stream;
+     mpz_srcptr x;
+#endif
+{
+  int i;
+  mp_size_t s;
+  mp_size_t xsize = ABS (x->_mp_size);
+  mp_srcptr xp = x->_mp_d;
+  mp_size_t out_bytesize;
+  mp_limb_t hi_limb;
+  int n_bytes_in_hi_limb;
+
+  if (stream == 0)
+    stream = stdout;
+
+  if (xsize == 0)
+    {
+      for (i = 4 - 1; i >= 0; i--)
+       fputc (0, stream);
+      return ferror (stream) ? 0 : 4;
+    }
+
+  hi_limb = xp[xsize - 1];
+  for (i = BYTES_PER_MP_LIMB - 1; i > 0; i--)
+    {
+      if ((hi_limb >> i * BITS_PER_CHAR) != 0)
+       break;
+    }
+  n_bytes_in_hi_limb = i + 1;
+  out_bytesize = BYTES_PER_MP_LIMB * (xsize - 1) + n_bytes_in_hi_limb;
+  if (x->_mp_size < 0)
+    out_bytesize = -out_bytesize;
+
+  /* Make the size 4 bytes on all machines, to make the format portable.  */
+  for (i = 4 - 1; i >= 0; i--)
+    fputc ((out_bytesize >> (i * BITS_PER_CHAR)) % (1 << BITS_PER_CHAR),
+          stream);
+
+  /* Output from the most significant limb to the least significant limb,
+     with each limb also output in decreasing significance order.  */
+
+  /* Output the most significant limb separately, since we will only
+     output some of its bytes.  */
+  for (i = n_bytes_in_hi_limb - 1; i >= 0; i--)
+    fputc ((hi_limb >> (i * BITS_PER_CHAR)) % (1 << BITS_PER_CHAR), stream);
+
+  /* Output the remaining limbs.  */
+  for (s = xsize - 2; s >= 0; s--)
+    {
+      mp_limb_t x_limb;
+
+      x_limb = xp[s];
+      for (i = BYTES_PER_MP_LIMB - 1; i >= 0; i--)
+       fputc ((x_limb >> (i * BITS_PER_CHAR)) % (1 << BITS_PER_CHAR), stream);
+    }
+  return ferror (stream) ? 0 : ABS (out_bytesize) + 4;
+}