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/* mpz_inp_str(dest_integer, stream, base) -- Input a number in base
BASE from stdio stream STREAM and store the result in DEST_INTEGER.
Copyright (C) 1991, 1993, 1994, 1996, 1998 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 Library General Public License as published by
the Free Software Foundation; either version 2 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 Library General Public
License for more details.
You should have received a copy of the GNU Library 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 <stdio.h>
#include <ctype.h>
#include "gmp.h"
#include "gmp-impl.h"
static int
digit_value_in_base (c, base)
int c;
int base;
{
int digit;
if (isdigit (c))
digit = c - '0';
else if (islower (c))
digit = c - 'a' + 10;
else if (isupper (c))
digit = c - 'A' + 10;
else
return -1;
if (digit < base)
return digit;
return -1;
}
size_t
#if __STDC__
mpz_inp_str (mpz_ptr x, FILE *stream, int base)
#else
mpz_inp_str (x, stream, base)
mpz_ptr x;
FILE *stream;
int base;
#endif
{
char *str;
size_t alloc_size, str_size;
int c;
int negative;
mp_size_t xsize;
size_t nread;
if (stream == 0)
stream = stdin;
nread = 0;
/* Skip whitespace. */
do
{
c = getc (stream);
nread++;
}
while (isspace (c));
negative = 0;
if (c == '-')
{
negative = 1;
c = getc (stream);
nread++;
}
if (digit_value_in_base (c, base == 0 ? 10 : base) < 0)
return 0; /* error if no 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 = getc (stream);
nread++;
if (c == 'x' || c == 'X')
{
base = 16;
c = getc (stream);
nread++;
}
else if (c == 'b' || c == 'B')
{
base = 2;
c = getc (stream);
nread++;
}
}
}
/* Skip leading zeros. */
while (c == '0')
{
c = getc (stream);
nread++;
}
alloc_size = 100;
str = (char *) (*_mp_allocate_func) (alloc_size);
str_size = 0;
for (;;)
{
int dig;
if (str_size >= alloc_size)
{
size_t old_alloc_size = alloc_size;
alloc_size = alloc_size * 3 / 2;
str = (char *) (*_mp_reallocate_func) (str, old_alloc_size, alloc_size);
}
dig = digit_value_in_base (c, base);
if (dig < 0)
break;
str[str_size++] = dig;
c = getc (stream);
}
ungetc (c, stream);
/* Make sure the string is not empty, mpn_set_str would fail. */
if (str_size == 0)
{
x->_mp_size = 0;
(*_mp_free_func) (str, alloc_size);
return nread;
}
xsize = (((mp_size_t) (str_size / __mp_bases[base].chars_per_bit_exactly))
/ BITS_PER_MP_LIMB + 2);
if (x->_mp_alloc < xsize)
_mpz_realloc (x, xsize);
/* Convert the byte array in base BASE to our bignum format. */
xsize = mpn_set_str (x->_mp_d, (unsigned char *) str, str_size, base);
x->_mp_size = negative ? -xsize : xsize;
(*_mp_free_func) (str, alloc_size);
return str_size + nread;
}
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