text: /*
   * Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
   * Written by Eric Blake
   *
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 3 of the License, or
   * (at your option) any later version.
   *
   * This program 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 General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  #include <stdlib.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (strtod, double, (char const *, char **));
  
  #include <errno.h>
  #include <float.h>
  #include <math.h>
  #include <string.h>
  
  #include "isnand-nolibm.h"
  #include "macros.h"
  
  /* Avoid requiring -lm just for fabs.  */
  #define FABS(d) ((d) < 0.0 ? -(d) : (d))
  
  /* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
     So we use -zero instead.  */
  double zero = 0.0;
  
  int
  main (void)
  {
    int status = 0;
    /* Subject sequence empty or invalid.  */
    {
      const char input[] = "";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input);
      ASSERT (errno == 0 || errno == EINVAL);
    }
    {
      const char input[] = " ";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input);
      ASSERT (errno == 0 || errno == EINVAL);
    }
    {
      const char input[] = " +";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input);
      ASSERT (errno == 0 || errno == EINVAL);
    }
    {
      const char input[] = " .";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input);
      ASSERT (errno == 0 || errno == EINVAL);
    }
    {
      const char input[] = " .e0";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input);              /* IRIX 6.5, OSF/1 5.1 */
      ASSERT (errno == 0 || errno == EINVAL);
    }
    {
      const char input[] = " +.e-0";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input);              /* IRIX 6.5, OSF/1 5.1 */
      ASSERT (errno == 0 || errno == EINVAL);
    }
    {
      const char input[] = " in";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input);
      ASSERT (errno == 0 || errno == EINVAL);
    }
    {
      const char input[] = " na";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input);
      ASSERT (errno == 0 || errno == EINVAL);
    }
  
    /* Simple floating point values.  */
    {
      const char input[] = "1";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);
      ASSERT (ptr == input + 1);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "1.";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);
      ASSERT (ptr == input + 2);
      ASSERT (errno == 0);
    }
    {
      const char input[] = ".5";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      /* FIXME - gnulib's version is rather inaccurate.  It would be
         nice to guarantee an exact result, but for now, we settle for a
         1-ulp error.  */
      ASSERT (FABS (result - 0.5) < DBL_EPSILON);
      ASSERT (ptr == input + 2);
      ASSERT (errno == 0);
    }
    {
      const char input[] = " 1";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);
      ASSERT (ptr == input + 2);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "+1";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);
      ASSERT (ptr == input + 2);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "-1";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == -1.0);
      ASSERT (ptr == input + 2);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "1e0";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);
      ASSERT (ptr == input + 3);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "1e+0";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);
      ASSERT (ptr == input + 4);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "1e-0";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);
      ASSERT (ptr == input + 4);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "1e1";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 10.0);
      ASSERT (ptr == input + 3);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "5e-1";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      /* FIXME - gnulib's version is rather inaccurate.  It would be
         nice to guarantee an exact result, but for now, we settle for a
         1-ulp error.  */
      ASSERT (FABS (result - 0.5) < DBL_EPSILON);
      ASSERT (ptr == input + 4);
      ASSERT (errno == 0);
    }
  
    /* Zero.  */
    {
      const char input[] = "0";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input + 1);
      ASSERT (errno == 0);
    }
    {
      const char input[] = ".0";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input + 2);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0e0";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input + 3);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0e+9999999";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input + 10);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0e-9999999";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input + 10);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "-0";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!!signbit (result) == !!signbit (-zero)); /* IRIX 6.5, OSF/1 4.0 */
      ASSERT (ptr == input + 2);
      ASSERT (errno == 0);
    }
  
    /* Suffixes.  */
    {
      const char input[] = "1f";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);
      ASSERT (ptr == input + 1);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "1.f";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);
      ASSERT (ptr == input + 2);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "1e";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);
      ASSERT (ptr == input + 1);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "1e+";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);
      ASSERT (ptr == input + 1);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "1e-";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);
      ASSERT (ptr == input + 1);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "1E 2";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);             /* HP-UX 11.11, IRIX 6.5, OSF/1 4.0 */
      ASSERT (ptr == input + 1);          /* HP-UX 11.11, IRIX 6.5 */
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0x";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input + 1);          /* glibc-2.3.6, MacOS X 10.3, FreeBSD 6.2 */
      ASSERT (errno == 0);
    }
    {
      const char input[] = "00x1";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input + 2);
      ASSERT (errno == 0);
    }
    {
      const char input[] = "-0x";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!!signbit (result) == !!signbit (-zero)); /* MacOS X 10.3, FreeBSD 6.2, IRIX 6.5, OSF/1 4.0 */
      ASSERT (ptr == input + 2);          /* glibc-2.3.6, MacOS X 10.3, FreeBSD 6.2 */
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0xg";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input + 1);          /* glibc-2.3.6, MacOS X 10.3, FreeBSD 6.2 */
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0xp";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input + 1);          /* glibc-2.3.6, MacOS X 10.3, FreeBSD 6.2 */
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0x.";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input + 1);          /* glibc-2.3.6, MacOS X 10.3, FreeBSD 6.2 */
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0xp+";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input + 1);          /* glibc-2.3.6, MacOS X 10.3, FreeBSD 6.2 */
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0xp+1";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input + 1);          /* glibc-2.3.6, MacOS X 10.3, FreeBSD 6.2 */
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0x.p+1";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input + 1);          /* glibc-2.3.6, MacOS X 10.3, FreeBSD 6.2 */
      ASSERT (errno == 0);
    }
    {
      const char input[] = "1p+1";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);
      ASSERT (ptr == input + 1);
      ASSERT (errno == 0);
    }
  
    /* Overflow/underflow.  */
    {
      const char input[] = "1E1000000";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == HUGE_VAL);
      ASSERT (ptr == input + 9);          /* OSF/1 5.1 */
      ASSERT (errno == ERANGE);
    }
    {
      const char input[] = "-1E1000000";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == -HUGE_VAL);
      ASSERT (ptr == input + 10);
      ASSERT (errno == ERANGE);
    }
    {
      const char input[] = "1E-100000";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (0.0 <= result && result <= DBL_MIN);
      ASSERT (!signbit (result));
      ASSERT (ptr == input + 9);
      ASSERT (errno == ERANGE);
    }
    {
      const char input[] = "-1E-100000";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (-DBL_MIN <= result && result <= 0.0);
  #if 0
      /* FIXME - this is glibc bug 5995; POSIX allows returning positive
         0 on negative underflow, even though quality of implementation
         demands preserving the sign.  Disable this test until fixed
         glibc is more prevalent.  */
      ASSERT (!!signbit (result) == !!signbit (-zero)); /* glibc-2.3.6, mingw */
  #endif
      ASSERT (ptr == input + 10);
      ASSERT (errno == ERANGE);
    }
  
    /* Infinity.  */
    {
      const char input[] = "iNf";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == HUGE_VAL);        /* OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (ptr == input + 3);          /* OpenBSD 4.0, HP-UX 11.00, IRIX 6.5, OSF/1 5.1, Solaris 9, mingw */
      ASSERT (errno == 0);                /* HP-UX 11.11, OSF/1 4.0 */
    }
    {
      const char input[] = "-InF";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == -HUGE_VAL);       /* OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (ptr == input + 4);          /* OpenBSD 4.0, HP-UX 11.00, IRIX 6.5, OSF/1 4.0, Solaris 9, mingw */
      ASSERT (errno == 0);                /* HP-UX 11.11, OSF/1 4.0 */
    }
    {
      const char input[] = "infinite";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == HUGE_VAL);        /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (ptr == input + 3);          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (errno == 0);                /* OSF/1 4.0 */
    }
    {
      const char input[] = "infinitY";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == HUGE_VAL);        /* OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (ptr == input + 8);          /* OpenBSD 4.0, HP-UX 11.00, IRIX 6.5, OSF/1 5.1, Solaris 9, mingw */
      ASSERT (errno == 0);                /* HP-UX 11.11, OSF/1 4.0 */
    }
    {
      const char input[] = "infinitY.";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == HUGE_VAL);        /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (ptr == input + 8);          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (errno == 0);                /* OSF/1 4.0 */
    }
  
    /* NaN.  Some processors set the sign bit of the default NaN, so all
       we check is that using a sign changes the result.  */
    {
      const char input[] = "-nan";
      char *ptr1;
      char *ptr2;
      double result1;
      double result2;
      errno = 0;
      result1 = strtod (input, &ptr1);
      result2 = strtod (input + 1, &ptr2);
  #if 1 /* All known CPUs support NaNs.  */
      ASSERT (isnand (result1));          /* OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (isnand (result2));          /* OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
  # if 0
      /* Sign bits of NaN is a portability sticking point, not worth
         worrying about.  */
      ASSERT (!!signbit (result1) != !!signbit (result2)); /* glibc-2.3.6, IRIX 6.5, OSF/1 5.1, mingw */
  # endif
      ASSERT (ptr1 == input + 4);         /* OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, Solaris 2.5.1, mingw */
      ASSERT (ptr2 == input + 4);         /* OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, Solaris 2.5.1, mingw */
      ASSERT (errno == 0);                /* HP-UX 11.11 */
  #else
      ASSERT (result1 == 0.0);
      ASSERT (result2 == 0.0);
      ASSERT (!signbit (result1));
      ASSERT (!signbit (result2));
      ASSERT (ptr1 == input);
      ASSERT (ptr2 == input + 1);
      ASSERT (errno == 0 || errno == EINVAL);
  #endif
    }
    {
      const char input[] = "+nan(";
      char *ptr1;
      char *ptr2;
      double result1;
      double result2;
      errno = 0;
      result1 = strtod (input, &ptr1);
      result2 = strtod (input + 1, &ptr2);
  #if 1 /* All known CPUs support NaNs.  */
      ASSERT (isnand (result1));          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (isnand (result2));          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (!!signbit (result1) == !!signbit (result2));
      ASSERT (ptr1 == input + 4);         /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 2.5.1, mingw */
      ASSERT (ptr2 == input + 4);         /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 2.5.1, mingw */
      ASSERT (errno == 0);
  #else
      ASSERT (result1 == 0.0);
      ASSERT (result2 == 0.0);
      ASSERT (!signbit (result1));
      ASSERT (!signbit (result2));
      ASSERT (ptr1 == input);
      ASSERT (ptr2 == input + 1);
      ASSERT (errno == 0 || errno == EINVAL);
  #endif
    }
    {
      const char input[] = "-nan()";
      char *ptr1;
      char *ptr2;
      double result1;
      double result2;
      errno = 0;
      result1 = strtod (input, &ptr1);
      result2 = strtod (input + 1, &ptr2);
  #if 1 /* All known CPUs support NaNs.  */
      ASSERT (isnand (result1));          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (isnand (result2));          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
  # if 0
      /* Sign bits of NaN is a portability sticking point, not worth
         worrying about.  */
      ASSERT (!!signbit (result1) != !!signbit (result2)); /* glibc-2.3.6, IRIX 6.5, OSF/1 5.1, mingw */
  # endif
      ASSERT (ptr1 == input + 6);         /* glibc-2.3.6, MacOS X 10.3, FreeBSD 6.2, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (ptr2 == input + 6);         /* glibc-2.3.6, MacOS X 10.3, FreeBSD 6.2, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (errno == 0);
  #else
      ASSERT (result1 == 0.0);
      ASSERT (result2 == 0.0);
      ASSERT (!signbit (result1));
      ASSERT (!signbit (result2));
      ASSERT (ptr1 == input);
      ASSERT (ptr2 == input + 1);
      ASSERT (errno == 0 || errno == EINVAL);
  #endif
    }
    {
      const char input[] = " nan().";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
  #if 1 /* All known CPUs support NaNs.  */
      ASSERT (isnand (result));           /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (ptr == input + 6);          /* glibc-2.3.6, MacOS X 10.3, FreeBSD 6.2, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (errno == 0);
  #else
      ASSERT (result == 0.0);
      ASSERT (!signbit (result));
      ASSERT (ptr == input);
      ASSERT (errno == 0 || errno == EINVAL);
  #endif
    }
    {
      /* The behavior of nan(0) is implementation-defined, but all
         implementations we know of which handle optional
         n-char-sequences handle nan(0) the same as nan().  */
      const char input[] = "-nan(0).";
      char *ptr1;
      char *ptr2;
      double result1;
      double result2;
      errno = 0;
      result1 = strtod (input, &ptr1);
      result2 = strtod (input + 1, &ptr2);
  #if 1 /* All known CPUs support NaNs.  */
      ASSERT (isnand (result1));          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (isnand (result2));          /* OpenBSD 4.0, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
  # if 0
      /* Sign bits of NaN is a portability sticking point, not worth
         worrying about.  */
      ASSERT (!!signbit (result1) != !!signbit (result2)); /* glibc-2.3.6, IRIX 6.5, OSF/1 5.1, mingw */
  # endif
      ASSERT (ptr1 == input + 7);         /* glibc-2.3.6, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (ptr2 == input + 7);         /* glibc-2.3.6, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, mingw */
      ASSERT (errno == 0);
  #else
      ASSERT (result1 == 0.0);
      ASSERT (result2 == 0.0);
      ASSERT (!signbit (result1));
      ASSERT (!signbit (result2));
      ASSERT (ptr1 == input);
      ASSERT (ptr2 == input + 1);
      ASSERT (errno == 0 || errno == EINVAL);
  #endif
    }
  
    /* Hex.  */
    {
      const char input[] = "0xa";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 10.0);            /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
      ASSERT (ptr == input + 3);          /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0XA";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 10.0);            /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
      ASSERT (ptr == input + 3);          /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0x1p";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);             /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
      ASSERT (ptr == input + 3);          /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0x1p+";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 1.0);             /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
      ASSERT (ptr == input + 3);          /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0x1p+1";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 2.0);             /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
      ASSERT (ptr == input + 6);          /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
      ASSERT (errno == 0);
    }
    {
      const char input[] = "0x1p+1a";
      char *ptr;
      double result;
      errno = 0;
      result = strtod (input, &ptr);
      ASSERT (result == 2.0);             /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
      ASSERT (ptr == input + 6);          /* NetBSD 3.0, OpenBSD 4.0, AIX 5.1, HP-UX 11.11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw */
      ASSERT (errno == 0);
    }
  
    /* Large buffers.  */
    {
      size_t m = 1000000;
      char *input = malloc (m + 1);
      if (input)
        {
          char *ptr;
          double result;
          memset (input, '\t', m - 1);
          input[m - 1] = '1';
          input[m] = '\0';
          errno = 0;
          result = strtod (input, &ptr);
          ASSERT (result == 1.0);
          ASSERT (ptr == input + m);
          ASSERT (errno == 0);
        }
      free (input);
    }
    {
      size_t m = 1000000;
      char *input = malloc (m + 1);
      if (input)
        {
          char *ptr;
          double result;
          memset (input, '0', m - 1);
          input[m - 1] = '1';
          input[m] = '\0';
          errno = 0;
          result = strtod (input, &ptr);
          ASSERT (result == 1.0);
          ASSERT (ptr == input + m);
          ASSERT (errno == 0);
        }
      free (input);
    }
  #if 0
    /* Newlib has an artificial limit of 20000 for the exponent.  TODO -
       gnulib should fix this.  */
    {
      size_t m = 1000000;
      char *input = malloc (m + 1);
      if (input)
        {
          char *ptr;
          double result;
          input[0] = '.';
          memset (input + 1, '0', m - 10);
          input[m - 9] = '1';
          input[m - 8] = 'e';
          input[m - 7] = '+';
          input[m - 6] = '9';
          input[m - 5] = '9';
          input[m - 4] = '9';
          input[m - 3] = '9';
          input[m - 2] = '9';
          input[m - 1] = '1';
          input[m] = '\0';
          errno = 0;
          result = strtod (input, &ptr);
          ASSERT (result == 1.0);         /* MacOS X 10.3, FreeBSD 6.2, NetBSD 3.0, OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
          ASSERT (ptr == input + m);      /* OSF/1 5.1 */
          ASSERT (errno == 0);            /* MacOS X 10.3, FreeBSD 6.2, NetBSD 3.0, OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
        }
      free (input);
    }
    {
      size_t m = 1000000;
      char *input = malloc (m + 1);
      if (input)
        {
          char *ptr;
          double result;
          input[0] = '1';
          memset (input + 1, '0', m - 9);
          input[m - 8] = 'e';
          input[m - 7] = '-';
          input[m - 6] = '9';
          input[m - 5] = '9';
          input[m - 4] = '9';
          input[m - 3] = '9';
          input[m - 2] = '9';
          input[m - 1] = '1';
          input[m] = '\0';
          errno = 0;
          result = strtod (input, &ptr);
          ASSERT (result == 1.0);         /* MacOS X 10.3, FreeBSD 6.2, NetBSD 3.0, OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
          ASSERT (ptr == input + m);
          ASSERT (errno == 0);            /* MacOS X 10.3, FreeBSD 6.2, NetBSD 3.0, OpenBSD 4.0, IRIX 6.5, OSF/1 5.1, mingw */
        }
      free (input);
    }
  #endif
    {
      size_t m = 1000000;
      char *input = malloc (m + 1);
      if (input)
        {
          char *ptr;
          double result;
          input[0] = '-';
          input[1] = '0';
          input[2] = 'e';
          input[3] = '1';
          memset (input + 4, '0', m - 3);
          input[m] = '\0';
          errno = 0;
          result = strtod (input, &ptr);
          ASSERT (result == 0.0);
          ASSERT (!!signbit (result) == !!signbit (-zero)); /* IRIX 6.5, OSF/1 4.0 */
          ASSERT (ptr == input + m);
          ASSERT (errno == 0);
        }
      free (input);
    }
  
    /* Rounding.  */
    /* TODO - is it worth some tests of rounding for typical IEEE corner
       cases, such as .5 ULP rounding up to the smallest denormal and
       not causing underflow, or DBL_MIN - .5 ULP not causing an
       infinite loop?  */
  
    return status;
  }
  