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

     1  /* Auxiliary functions for C++-style input of GMP types.
     2  
     3  Copyright 2001 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  int
    41  __gmp_istream_set_base (istream &i, char &c, bool &zero, bool &showbase)
    42  {
    43    int base;
    44  
    45    zero = showbase = false;
    46    switch (i.flags() & ios::basefield)
    47      {
    48      case ios::dec:
    49        base = 10;
    50        break;
    51      case ios::hex:
    52        base = 16;
    53        break;
    54      case ios::oct:
    55        base = 8;
    56        break;
    57      default:
    58        showbase = true; // look for initial "0" or "0x" or "0X"
    59        if (c == '0')
    60  	{
    61  	  if (! i.get(c))
    62  	    c = 0; // reset or we might loop indefinitely
    63  
    64  	  if (c == 'x' || c == 'X')
    65  	    {
    66  	      base = 16;
    67  	      i.get(c);
    68  	    }
    69  	  else
    70  	    {
    71  	      base = 8;
    72  	      zero = true; // if no other digit is read, the "0" counts
    73  	    }
    74  	}
    75        else
    76  	base = 10;
    77        break;
    78      }
    79  
    80    return base;
    81  }
    82  
    83  void
    84  __gmp_istream_set_digits (string &s, istream &i, char &c, bool &ok, int base)
    85  {
    86    switch (base)
    87      {
    88      case 10:
    89        while (isdigit(c))
    90  	{
    91  	  ok = true; // at least a valid digit was read
    92  	  s += c;
    93  	  if (! i.get(c))
    94  	    break;
    95  	}
    96        break;
    97      case 8:
    98        while (isdigit(c) && c != '8' && c != '9')
    99  	{
   100  	  ok = true; // at least a valid digit was read
   101  	  s += c;
   102  	  if (! i.get(c))
   103  	    break;
   104  	}
   105        break;
   106      case 16:
   107        while (isxdigit(c))
   108  	{
   109  	  ok = true; // at least a valid digit was read
   110  	  s += c;
   111  	  if (! i.get(c))
   112  	    break;
   113  	}
   114        break;
   115      }
   116  }