Reorganisation of the source tree

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

diff --git a/rts/gmp/mpz/inp_raw.c b/rts/gmp/mpz/inp_raw.c
new file mode 100644 (file)
index 0000000..15e6012
--- /dev/null
+++ b/rts/gmp/mpz/inp_raw.c
@@ -0,0 +1,101 @@
+/* mpz_inp_raw -- Input a mpz_t in raw, but endianess, and wordsize
+   independent format (as output by mpz_out_raw).
+
+Copyright (C) 1991, 1993, 1994, 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 Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser 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_inp_raw (mpz_ptr x, FILE *stream)
+#else
+mpz_inp_raw (x, stream)
+     mpz_ptr x;
+     FILE *stream;
+#endif
+{
+  int i;
+  mp_size_t s;
+  mp_size_t xsize;
+  mp_ptr xp;
+  unsigned int c;
+  mp_limb_t x_limb;
+  mp_size_t in_bytesize;
+  int neg_flag;
+
+  if (stream == 0)
+    stream = stdin;
+
+  /* Read 4-byte size */
+  in_bytesize = 0;
+  for (i = 4 - 1; i >= 0; i--)
+    {
+      c = fgetc (stream);
+      in_bytesize = (in_bytesize << BITS_PER_CHAR) | c;
+    }
+
+  /* Size is stored as a 32 bit word; sign extend in_bytesize for non-32 bit
+     machines.  */
+  if (sizeof (mp_size_t) > 4)
+    in_bytesize |= (-(in_bytesize < 0)) << 31;
+
+  neg_flag = in_bytesize < 0;
+  in_bytesize = ABS (in_bytesize);
+  xsize = (in_bytesize + BYTES_PER_MP_LIMB - 1) / BYTES_PER_MP_LIMB;
+
+  if (xsize == 0)
+    {
+      x->_mp_size = 0;
+      return 4;                        /* we've read 4 bytes */
+    }
+
+  if (x->_mp_alloc < xsize)
+    _mpz_realloc (x, xsize);
+  xp = x->_mp_d;
+
+  x_limb = 0;
+  for (i = (in_bytesize - 1) % BYTES_PER_MP_LIMB; i >= 0; i--)
+    {
+      c = fgetc (stream);
+      x_limb = (x_limb << BITS_PER_CHAR) | c;
+    }
+  xp[xsize - 1] = x_limb;
+
+  for (s = xsize - 2; s >= 0; s--)
+    {
+      x_limb = 0;
+      for (i = BYTES_PER_MP_LIMB - 1; i >= 0; i--)
+       {
+         c = fgetc (stream);
+         x_limb = (x_limb << BITS_PER_CHAR) | c;
+       }
+      xp[s] = x_limb;
+    }
+
+  if (c == EOF)
+    return 0;                  /* error */
+
+  MPN_NORMALIZE (xp, xsize);
+  x->_mp_size = neg_flag ? -xsize : xsize;
+  return in_bytesize + 4;
+}