Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpz / get_str.c

diff --git a/gmp/mpz/get_str.c b/gmp/mpz/get_str.c
new file mode 100644 (file)
index 0000000..cce5193
--- /dev/null
+++ b/gmp/mpz/get_str.c
@@ -0,0 +1,115 @@
+/* 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 1991, 1993, 1994, 1996, 2000, 2001, 2002, 2005 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 3 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.  If not, see http://www.gnu.org/licenses/.  */
+
+#include <string.h> /* for strlen */
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+
+char *
+mpz_get_str (char *res_str, int base, mpz_srcptr x)
+{
+  mp_ptr xp;
+  mp_size_t x_size = x->_mp_size;
+  char *str;
+  char *return_str;
+  size_t str_size;
+  size_t alloc_size = 0;
+  char *num_to_text;
+  int i;
+  TMP_DECL;
+
+  if (base >= 0)
+    {
+      num_to_text = "0123456789abcdefghijklmnopqrstuvwxyz";
+      if (base == 0)
+       base = 10;
+      else if (base > 36)
+       {
+         num_to_text = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+         if (base > 62)
+           return NULL;
+       }
+    }
+  else
+    {
+      base = -base;
+      num_to_text = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+    }
+
+  /* allocate string for the user if necessary */
+  if (res_str == NULL)
+    {
+      /* digits, null terminator, possible minus sign */
+      MPN_SIZEINBASE (alloc_size, PTR(x), ABS(x_size), base);
+      alloc_size += 1 + (x_size<0);
+      res_str = (char *) (*__gmp_allocate_func) (alloc_size);
+    }
+  return_str = res_str;
+
+  if (x_size < 0)
+    {
+      *res_str++ = '-';
+      x_size = -x_size;
+    }
+
+  /* mpn_get_str clobbers its input on non power-of-2 bases */
+  TMP_MARK;
+  xp = x->_mp_d;
+  if (! POW2_P (base))
+    {
+      xp = TMP_ALLOC_LIMBS (x_size + 1);  /* +1 in case x_size==0 */
+      MPN_COPY (xp, x->_mp_d, x_size);
+    }
+
+  str_size = mpn_get_str ((unsigned char *) res_str, base, xp, x_size);
+  ASSERT (alloc_size == 0 || str_size <= alloc_size - (SIZ(x) < 0));
+
+  /* might have a leading zero, skip it */
+  str = res_str;
+  if (*res_str == 0 && str_size != 1)
+    {
+      str_size--;
+      str++;
+      ASSERT (*str != 0);  /* at most one leading zero */
+    }
+
+  /* Convert result to printable chars, and move down if there was a leading
+     zero.  */
+  for (i = 0; i < str_size; i++)
+    res_str[i] = num_to_text[(int) str[i]];
+  res_str[str_size] = 0;
+
+  TMP_FREE;
+
+  /* if allocated then resize down to the actual space required */
+  if (alloc_size != 0)
+    {
+      size_t  actual_size = str_size + 1 + (res_str - return_str);
+      ASSERT (actual_size == strlen (return_str) + 1);
+      __GMP_REALLOCATE_FUNC_MAYBE_TYPE (return_str, alloc_size, actual_size,
+                                        char);
+    }
+  return return_str;
+}