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      1 /* mpc_strtoc -- Read a complex number from a string.
      2 
      3 Copyright (C) 2009, 2010, 2011, 2012 INRIA
      4 
      5 This file is part of GNU MPC.
      6 
      7 GNU MPC is free software; you can redistribute it and/or modify it under
      8 the terms of the GNU Lesser General Public License as published by the
      9 Free Software Foundation; either version 3 of the License, or (at your
     10 option) any later version.
     11 
     12 GNU MPC is distributed in the hope that it will be useful, but WITHOUT ANY
     13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
     14 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
     15 more details.
     16 
     17 You should have received a copy of the GNU Lesser General Public License
     18 along with this program. If not, see http://www.gnu.org/licenses/ .
     19 */
     20 
     21 #include <string.h>
     22 #include <ctype.h>
     23 #include "mpc-impl.h"
     24 
     25 static void
     26 skip_whitespace (const char **p)
     27 {
     28    /* TODO: This function had better be inlined, but it is unclear whether
     29       the hassle to get this implemented across all platforms is worth it. */
     30    while (isspace ((unsigned char) **p))
     31       (*p)++;
     32 }
     33 
     34 int
     35 mpc_strtoc (mpc_ptr rop, const char *nptr, char **endptr, int base, mpc_rnd_t rnd)
     36 {
     37    const char *p;
     38    char *end;
     39    int bracketed = 0;
     40 
     41    int inex_re = 0, inex_im = 0;
     42 
     43    if (nptr == NULL || base > 36 || base == 1)
     44      goto error;
     45 
     46    p = nptr;
     47    skip_whitespace (&p);
     48 
     49    if (*p == '('){
     50       bracketed = 1;
     51       ++p;
     52    }
     53 
     54    inex_re = mpfr_strtofr (mpc_realref(rop), p, &end, base, MPC_RND_RE (rnd));
     55    if (end == p)
     56       goto error;
     57    p = end;
     58 
     59    if (!bracketed)
     60      inex_im = mpfr_set_ui (mpc_imagref (rop), 0ul, MPFR_RNDN);
     61    else {
     62      if (!isspace ((unsigned char)*p))
     63          goto error;
     64 
     65       skip_whitespace (&p);
     66 
     67       inex_im = mpfr_strtofr (mpc_imagref(rop), p, &end, base, MPC_RND_IM (rnd));
     68       if (end == p)
     69          goto error;
     70       p = end;
     71 
     72       skip_whitespace (&p);
     73       if (*p != ')')
     74          goto error;
     75 
     76       p++;
     77    }
     78 
     79    if (endptr != NULL)
     80      *endptr = (char*) p;
     81    return MPC_INEX (inex_re, inex_im);
     82 
     83 error:
     84    if (endptr != NULL)
     85      *endptr = (char*) nptr;
     86    mpfr_set_nan (mpc_realref (rop));
     87    mpfr_set_nan (mpc_imagref (rop));
     88    return -1;
     89 }
     90