120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/* 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, 2000-2002, 2005, 2012 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 either:
|
|
|
|
* 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.
|
|
|
|
or
|
|
|
|
* the GNU General Public License as published by the Free Software
|
|
Foundation; either version 2 of the License, or (at your option) any
|
|
later version.
|
|
|
|
or both in parallel, as here.
|
|
|
|
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 copies of the GNU General Public License and the
|
|
GNU Lesser General Public License along with the GNU MP Library. If not,
|
|
see https://www.gnu.org/licenses/. */
|
|
|
|
#include <string.h> /* for strlen */
|
|
#include "mpir.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 = SIZ (x);
|
|
char *return_str;
|
|
size_t str_size;
|
|
size_t alloc_size = 0;
|
|
const char *num_to_text;
|
|
int i;
|
|
TMP_DECL;
|
|
|
|
if (base >= 0)
|
|
{
|
|
num_to_text = "0123456789abcdefghijklmnopqrstuvwxyz";
|
|
if (base <= 1)
|
|
base = 10;
|
|
else if (base > 36)
|
|
{
|
|
num_to_text = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
|
|
if (base > 62)
|
|
return NULL;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
base = -base;
|
|
if (base <= 1)
|
|
base = 10;
|
|
else if (base > 36)
|
|
return NULL;
|
|
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 = PTR (x);
|
|
if (! POW2_P (base))
|
|
{
|
|
xp = TMP_ALLOC_LIMBS (x_size | 1); /* |1 in case x_size==0 */
|
|
MPN_COPY (xp, PTR (x), 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));
|
|
|
|
/* Convert result to printable chars. */
|
|
for (i = 0; i < str_size; i++)
|
|
res_str[i] = num_to_text[(int) res_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;
|
|
}
|