65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
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/* __gmpz_operator_in_nowhite -- C++-style input of mpz_t, no whitespace skip.
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Copyright 2001, 2003 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <cctype>
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#include <iostream>
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#include <string>
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#include "gmp.h"
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#include "gmp-impl.h"
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using namespace std;
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// For g++ libstdc++ parsing see num_get<chartype,initer>::_M_extract_int in
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// include/bits/locale_facets.tcc.
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istream &
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__gmpz_operator_in_nowhite (istream &i, mpz_ptr z, char c)
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{
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int base;
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string s;
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bool ok = false, zero, showbase;
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if (c == '-' || c == '+') // sign
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{
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if (c == '-') // mpz_set_str doesn't accept '+'
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s = "-";
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i.get(c);
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}
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base = __gmp_istream_set_base(i, c, zero, showbase); // select the base
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__gmp_istream_set_digits(s, i, c, ok, base); // read the number
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if (i.good()) // last character read was non-numeric
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i.putback(c);
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else if (i.eof() && (ok || zero)) // stopped just before eof
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i.clear();
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if (ok)
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ASSERT_NOCARRY (mpz_set_str (z, s.c_str(), base)); // extract the number
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else if (zero)
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mpz_set_ui(z, 0);
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else
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i.setstate(ios::failbit); // read failed
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return i;
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}
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