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Annotation of OpenXM_contrib/gmp/cxx/isfuns.cc, Revision 1.1

1.1     ! ohara       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 the GNU Lesser General Public License as published by
        !             9: the Free Software Foundation; either version 2.1 of the License, or (at your
        !            10: option) any later version.
        !            11:
        !            12: The GNU MP Library is distributed in the hope that it will be useful, but
        !            13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Lesser General Public License
        !            18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: MA 02111-1307, USA. */
        !            21:
        !            22: #include <cctype>
        !            23: #include <iostream>
        !            24: #include <string>
        !            25: #include "gmp.h"
        !            26: #include "gmp-impl.h"
        !            27:
        !            28: using namespace std;
        !            29:
        !            30:
        !            31: int
        !            32: __gmp_istream_set_base (istream &i, char &c, bool &zero, bool &showbase)
        !            33: {
        !            34:   int base;
        !            35:
        !            36:   zero = showbase = false;
        !            37:   switch (i.flags() & ios::basefield)
        !            38:     {
        !            39:     case ios::dec:
        !            40:       base = 10;
        !            41:       break;
        !            42:     case ios::hex:
        !            43:       base = 16;
        !            44:       break;
        !            45:     case ios::oct:
        !            46:       base = 8;
        !            47:       break;
        !            48:     default:
        !            49:       showbase = true; // look for initial "0" or "0x" or "0X"
        !            50:       if (c == '0')
        !            51:        {
        !            52:          if (! i.get(c))
        !            53:            c = 0; // reset or we might loop indefinitely
        !            54:
        !            55:          if (c == 'x' || c == 'X')
        !            56:            {
        !            57:              base = 16;
        !            58:              i.get(c);
        !            59:            }
        !            60:          else
        !            61:            {
        !            62:              base = 8;
        !            63:              zero = true; // if no other digit is read, the "0" counts
        !            64:            }
        !            65:        }
        !            66:       else
        !            67:        base = 10;
        !            68:       break;
        !            69:     }
        !            70:
        !            71:   return base;
        !            72: }
        !            73:
        !            74: void
        !            75: __gmp_istream_set_digits (string &s, istream &i, char &c, bool &ok, int base)
        !            76: {
        !            77:   switch (base)
        !            78:     {
        !            79:     case 10:
        !            80:       while (isdigit(c))
        !            81:        {
        !            82:          ok = true; // at least a valid digit was read
        !            83:          s += c;
        !            84:          if (! i.get(c))
        !            85:            break;
        !            86:        }
        !            87:       break;
        !            88:     case 8:
        !            89:       while (isdigit(c) && c != '8' && c != '9')
        !            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 16:
        !            98:       while (isxdigit(c))
        !            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:     }
        !           107: }