contrib/mpc/src/strtoc.c

   1 /* mpc_strtoc -- Read a complex number from a string.
   2
   3 Copyright (C) 2009, 2010, 2011 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, GMP_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 }