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