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/* Auxiliary functions for C++-style input of GMP types.
Copyright 2001 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 https://www.gnu.org/licenses/. */
#include <cctype>
#include <iostream>
#include <string>
#include "gmp.h"
#include "gmp-impl.h"
using namespace std;
int
__gmp_istream_set_base (istream &i, char &c, bool &zero, bool &showbase)
{
int base;
zero = showbase = false;
switch (i.flags() & ios::basefield)
{
case ios::dec:
base = 10;
break;
case ios::hex:
base = 16;
break;
case ios::oct:
base = 8;
break;
default:
showbase = true; // look for initial "0" or "0x" or "0X"
if (c == '0')
{
if (! i.get(c))
c = 0; // reset or we might loop indefinitely
if (c == 'x' || c == 'X')
{
base = 16;
i.get(c);
}
else
{
base = 8;
zero = true; // if no other digit is read, the "0" counts
}
}
else
base = 10;
break;
}
return base;
}
void
__gmp_istream_set_digits (string &s, istream &i, char &c, bool &ok, int base)
{
switch (base)
{
case 10:
while (isdigit(c))
{
ok = true; // at least a valid digit was read
s += c;
if (! i.get(c))
break;
}
break;
case 8:
while (isdigit(c) && c != '8' && c != '9')
{
ok = true; // at least a valid digit was read
s += c;
if (! i.get(c))
break;
}
break;
case 16:
while (isxdigit(c))
{
ok = true; // at least a valid digit was read
s += c;
if (! i.get(c))
break;
}
break;
}
}
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