github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/cxx/ismpznw.cc (about)

     1  /* __gmpz_operator_in_nowhite -- C++-style input of mpz_t, no whitespace skip.
     2  
     3  Copyright 2001, 2003 Free Software Foundation, Inc.
     4  
     5  This file is part of the GNU MP Library.
     6  
     7  The GNU MP Library is free software; you can redistribute it and/or modify
     8  it under the terms of either:
     9  
    10    * the GNU Lesser General Public License as published by the Free
    11      Software Foundation; either version 3 of the License, or (at your
    12      option) any later version.
    13  
    14  or
    15  
    16    * the GNU General Public License as published by the Free Software
    17      Foundation; either version 2 of the License, or (at your option) any
    18      later version.
    19  
    20  or both in parallel, as here.
    21  
    22  The GNU MP Library is distributed in the hope that it will be useful, but
    23  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    24  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    25  for more details.
    26  
    27  You should have received copies of the GNU General Public License and the
    28  GNU Lesser General Public License along with the GNU MP Library.  If not,
    29  see https://www.gnu.org/licenses/.  */
    30  
    31  #include <cctype>
    32  #include <iostream>
    33  #include <string>
    34  #include "gmp.h"
    35  #include "gmp-impl.h"
    36  
    37  using namespace std;
    38  
    39  
    40  // For g++ libstdc++ parsing see num_get<chartype,initer>::_M_extract_int in
    41  // include/bits/locale_facets.tcc.
    42  
    43  istream &
    44  __gmpz_operator_in_nowhite (istream &i, mpz_ptr z, char c)
    45  {
    46    int base;
    47    string s;
    48    bool ok = false, zero, showbase;
    49  
    50    if (c == '-' || c == '+') // sign
    51      {
    52        if (c == '-') // mpz_set_str doesn't accept '+'
    53  	s = "-";
    54        i.get(c);
    55      }
    56  
    57    base = __gmp_istream_set_base(i, c, zero, showbase); // select the base
    58    __gmp_istream_set_digits(s, i, c, ok, base);         // read the number
    59  
    60    if (i.good()) // last character read was non-numeric
    61      i.putback(c);
    62    else if (i.eof() && (ok || zero)) // stopped just before eof
    63      i.clear(ios::eofbit);
    64  
    65    if (ok)
    66      ASSERT_NOCARRY (mpz_set_str (z, s.c_str(), base)); // extract the number
    67    else if (zero)
    68      mpz_set_ui(z, 0);
    69    else
    70      i.setstate(ios::failbit); // read failed
    71  
    72    return i;
    73  }