Reorganisation of the source tree

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

diff --git a/rts/gmp/mpz/get_str.c b/rts/gmp/mpz/get_str.c
new file mode 100644 (file)
index 0000000..c7278af
--- /dev/null
+++ b/rts/gmp/mpz/get_str.c
@@ -0,0 +1,118 @@
+/* mpz_get_str (string, base, mp_src) -- Convert the multiple precision
+   number MP_SRC to a string STRING of base BASE.  If STRING is NULL
+   allocate space for the result.  In any case, return a pointer to the
+   result.  If STRING is not NULL, the caller must ensure enough space is
+   available to store the result.
+
+Copyright (C) 1991, 1993, 1994, 1996 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 "gmp.h"
+#include "gmp-impl.h"
+
+char *
+#if __STDC__
+mpz_get_str (char *res_str, int base, mpz_srcptr x)
+#else
+mpz_get_str (res_str, base, x)
+     char *res_str;
+     int base;
+     mpz_srcptr x;
+#endif
+{
+  mp_ptr xp;
+  mp_size_t x_size = x->_mp_size;
+  unsigned char *str;
+  char *return_str;
+  size_t str_size;
+  char *num_to_text;
+  int i;
+  TMP_DECL (marker);
+
+  TMP_MARK (marker);
+  if (base >= 0)
+    {
+      if (base == 0)
+       base = 10;
+      num_to_text = "0123456789abcdefghijklmnopqrstuvwxyz";
+    }
+  else
+    {
+      base = -base;
+      num_to_text = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+    }
+
+  /* We allways allocate space for the string.  If the caller passed a
+     NULL pointer for RES_STR, we allocate permanent space and return
+     a pointer to that to the caller.  */
+  str_size = ((size_t) (ABS (x_size) * BITS_PER_MP_LIMB
+                       * __mp_bases[base].chars_per_bit_exactly)) + 3;
+  if (res_str == 0)
+    {
+      /* We didn't get a string from the user.  Allocate one (and return
+        a pointer to it).  */
+      res_str = (char *) (*_mp_allocate_func) (str_size);
+      /* Make str, the variable used for raw result from mpn_get_str,
+        point to the same string, but just after a possible minus sign.  */
+      str = (unsigned char *) res_str + 1;
+    }
+  else
+    {
+      /* Use TMP_ALLOC to get temporary space, since we need a few extra bytes
+        that we can't expect to caller to supply us with.  */
+      str = (unsigned char *) TMP_ALLOC (str_size);
+    }
+
+  return_str = res_str;
+
+  if (x_size == 0)
+    {
+      res_str[0] = '0';
+      res_str[1] = 0;
+      TMP_FREE (marker);
+      return res_str;
+    }
+  if (x_size < 0)
+    {
+      *res_str++ = '-';
+      x_size = -x_size;
+    }
+
+  /* Move the number to convert into temporary space, since mpn_get_str
+     clobbers its argument + needs one extra high limb....  */
+  xp = (mp_ptr) TMP_ALLOC ((x_size + 1) * BYTES_PER_MP_LIMB);
+  MPN_COPY (xp, x->_mp_d, x_size);
+
+  str_size = mpn_get_str (str, base, xp, x_size);
+
+  /* mpn_get_str might make some leading zeros.  Skip them.  */
+  while (*str == 0)
+    {
+      str_size--;
+      str++;
+    }
+
+  /* Translate result to printable chars and move result to RES_STR.  */
+  for (i = 0; i < str_size; i++)
+    res_str[i] = num_to_text[str[i]];
+  res_str[str_size] = 0;
+
+  TMP_FREE (marker);
+  return return_str;
+}