138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/* mpz_set_str(mp_dest, string, base) -- Convert the \0-terminated
|
|
string STRING in base BASE to multiple precision integer in
|
|
MP_DEST. Allow white space in the string. If BASE == 0 determine
|
|
the base in the C standard way, i.e. 0xhh...h means base 16,
|
|
0oo...o means base 8, otherwise assume base 10.
|
|
|
|
Copyright 1991, 1993, 1994, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 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 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., 51 Franklin Street, Fifth Floor, Boston,
|
|
MA 02110-1301, USA. */
|
|
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
#include "gmp.h"
|
|
#include "gmp-impl.h"
|
|
|
|
extern const unsigned char __gmp_digit_value_tab[];
|
|
#define digit_value_tab __gmp_digit_value_tab
|
|
|
|
int
|
|
mpz_set_str (mpz_ptr x, const char *str, int base)
|
|
{
|
|
size_t str_size;
|
|
char *s, *begs;
|
|
size_t i;
|
|
mp_size_t xsize;
|
|
int c;
|
|
int negative;
|
|
const unsigned char *digit_value;
|
|
TMP_DECL;
|
|
|
|
digit_value = digit_value_tab;
|
|
if (base > 36)
|
|
{
|
|
/* For bases > 36, use the collating sequence
|
|
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz. */
|
|
digit_value += 224;
|
|
if (base > 62)
|
|
return -1; /* too large base */
|
|
}
|
|
|
|
/* Skip whitespace. */
|
|
do
|
|
c = (unsigned char) *str++;
|
|
while (isspace (c));
|
|
|
|
negative = 0;
|
|
if (c == '-')
|
|
{
|
|
negative = 1;
|
|
c = (unsigned char) *str++;
|
|
}
|
|
|
|
if (digit_value[c] >= (base == 0 ? 10 : base))
|
|
return -1; /* error if no valid digits */
|
|
|
|
/* If BASE is 0, try to find out the base by looking at the initial
|
|
characters. */
|
|
if (base == 0)
|
|
{
|
|
base = 10;
|
|
if (c == '0')
|
|
{
|
|
base = 8;
|
|
c = (unsigned char) *str++;
|
|
if (c == 'x' || c == 'X')
|
|
{
|
|
base = 16;
|
|
c = (unsigned char) *str++;
|
|
}
|
|
else if (c == 'b' || c == 'B')
|
|
{
|
|
base = 2;
|
|
c = (unsigned char) *str++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Skip leading zeros and white space. */
|
|
while (c == '0' || isspace (c))
|
|
c = (unsigned char) *str++;
|
|
/* Make sure the string does not become empty, mpn_set_str would fail. */
|
|
if (c == 0)
|
|
{
|
|
x->_mp_size = 0;
|
|
return 0;
|
|
}
|
|
|
|
TMP_MARK;
|
|
str_size = strlen (str - 1);
|
|
s = begs = (char *) TMP_ALLOC (str_size + 1);
|
|
|
|
/* Remove spaces from the string and convert the result from ASCII to a
|
|
byte array. */
|
|
for (i = 0; i < str_size; i++)
|
|
{
|
|
if (!isspace (c))
|
|
{
|
|
int dig = digit_value[c];
|
|
if (dig >= base)
|
|
{
|
|
TMP_FREE;
|
|
return -1;
|
|
}
|
|
*s++ = dig;
|
|
}
|
|
c = (unsigned char) *str++;
|
|
}
|
|
|
|
str_size = s - begs;
|
|
|
|
xsize = (((mp_size_t) (str_size / __mp_bases[base].chars_per_bit_exactly))
|
|
/ GMP_NUMB_BITS + 2);
|
|
MPZ_REALLOC (x, xsize);
|
|
|
|
/* Convert the byte array in base BASE to our bignum format. */
|
|
xsize = mpn_set_str (x->_mp_d, (unsigned char *) begs, str_size, base);
|
|
x->_mp_size = negative ? -xsize : xsize;
|
|
|
|
TMP_FREE;
|
|
return 0;
|
|
}
|