[project @ 1996-01-08 20:28:12 by partain]

[ghc-hetmet.git] / ghc / runtime / gmp / mpz_inp_raw.c

diff --git a/ghc/runtime/gmp/mpz_inp_raw.c b/ghc/runtime/gmp/mpz_inp_raw.c
new file mode 100644 (file)
index 0000000..576f4b6
--- /dev/null
+++ b/ghc/runtime/gmp/mpz_inp_raw.c
@@ -0,0 +1,72 @@
+/* mpz_inp_raw -- Input a MP_INT in raw, but endianess, and wordsize
+   independent format (as output by mpz_out_raw).
+
+Copyright (C) 1991, 1992 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 General Public License as published by
+the Free Software Foundation; either version 2, 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with the GNU MP Library; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include <stdio.h>
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void
+#ifdef __STDC__
+mpz_inp_raw (MP_INT *x, FILE *file)
+#else
+mpz_inp_raw (x, file)
+     MP_INT *x;
+     FILE *file;
+#endif
+{
+  int i;
+  mp_size s;
+  mp_size xsize;
+  mp_ptr xp;
+  unsigned int c;
+  mp_limb x_digit;
+  mp_size x_index;
+
+  xsize = 0;
+  for (i = 4 - 1; i >= 0; i--)
+    {
+      c = fgetc (file);
+      xsize = (xsize << BITS_PER_CHAR) | c;
+    }
+
+  /* ??? Sign extend xsize for non-32 bit machines?  */
+
+  x_index = (ABS (xsize) + BYTES_PER_MP_LIMB - 1) / BYTES_PER_MP_LIMB - 1;
+
+  if (x->alloc < x_index)
+    _mpz_realloc (x, x_index);
+
+  xp = x->d;
+  x->size = xsize / BYTES_PER_MP_LIMB;
+  x_digit = 0;
+  for (s = ABS (xsize) - 1; s >= 0; s--)
+    {
+      i = s % BYTES_PER_MP_LIMB;
+      c = fgetc (file);
+      x_digit = (x_digit << BITS_PER_CHAR) | c;
+      if (i == 0)
+       {
+         xp[x_index--] = x_digit;
+         x_digit = 0;
+       }
+    }
+}