/* mpc_strtoc -- Read a complex number from a string.

Copyright (C) 2009, 2010, 2011, 2012 INRIA

This file is part of GNU MPC.

GNU MPC 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.

GNU MPC 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 this program. If not, see http://www.gnu.org/licenses/ .

*/

#include <string.h>

#include <ctype.h>

#include "mpc-impl.h"

static void

skip_whitespace (const char **p)

{

   /* TODO: This function had better be inlined, but it is unclear whether

      the hassle to get this implemented across all platforms is worth it. */

   while (isspace ((unsigned char) **p))

      (*p)++;

}

int

mpc_strtoc (mpc_ptr rop, const char *nptr, char **endptr, int base, mpc_rnd_t rnd)

{

   const char *p;

   char *end;

   int bracketed = 0;

   int inex_re = 0, inex_im = 0;

   if (nptr == NULL || base > 36 || base == 1)

     goto error;

   p = nptr;

   skip_whitespace (&p);

   if (*p == '('){

      bracketed = 1;

      ++p;

   }

   inex_re = mpfr_strtofr (mpc_realref(rop), p, &end, base, MPC_RND_RE (rnd));

   if (end == p)

      goto error;

   p = end;

   if (!bracketed)

     inex_im = mpfr_set_ui (mpc_imagref (rop), 0ul, MPFR_RNDN);

   else {

     if (!isspace ((unsigned char)*p))

         goto error;

      skip_whitespace (&p);

      inex_im = mpfr_strtofr (mpc_imagref(rop), p, &end, base, MPC_RND_IM (rnd));

      if (end == p)

         goto error;

      p = end;

      skip_whitespace (&p);

      if (*p != ')')

         goto error;

      p++;

   }

   if (endptr != NULL)

     *endptr = (char*) p;

   return MPC_INEX (inex_re, inex_im);

error:

   if (endptr != NULL)

     *endptr = (char*) nptr;

   mpfr_set_nan (mpc_realref (rop));

   mpfr_set_nan (mpc_imagref (rop));

   return -1;

}