xref: /src/external/lgpl3/gmp/dist/mpq/inp_str.c

/* mpq_inp_str -- read an mpq from a FILE.

Copyright 2001 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */

#include <stdio.h>
#include <ctype.h>
#include "gmp.h"
#include "gmp-impl.h"


size_t
mpq_inp_str (mpq_ptr q, FILE *fp, int base)
{
  size_t  nread;
  int     c;

  if (fp == NULL)
    fp = stdin;

  q->_mp_den._mp_size = 1;
  q->_mp_den._mp_d[0] = 1;

  nread = mpz_inp_str (mpq_numref(q), fp, base);
  if (nread == 0)
    return 0;

  c = getc (fp);
  nread++;

  if (c == '/')
    {
      c = getc (fp);
      nread++;

      nread = mpz_inp_str_nowhite (mpq_denref(q), fp, base, c, nread);
      if (nread == 0)
        {
          q->_mp_num._mp_size = 0;
          q->_mp_den._mp_size = 1;
          q->_mp_den._mp_d[0] = 1;
        }
    }
  else
    {
      ungetc (c, fp);
      nread--;
    }

  return nread;
}