/* xstrtod.c - error-checking interface to strtod   Copyright (C) 1996, 1999, 2000 Free Software Foundation, Inc.   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 2, 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, write to the Free Software Foundation,   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  *//* Written by Jim Meyering.  */#ifdef HAVE_CONFIG_H# include <config.h>#endif#ifdef STDC_HEADERS# include <stdlib.h>#elsedouble strtod ();#endif#include <errno.h>#include <stdio.h>#include <limits.h>#include "xstrtod.h"/* Tell the compiler that non-default rounding modes are used.  */#if 199901 <= __STDC_VERSION__ #pragma STDC FENV_ACCESS ON#endif/* An interface to strtod that encapsulates all the error checking   one should usually perform.  Like strtod, but upon successful   conversion put the result in *RESULT and return zero.  Return   non-zero and don't modify *RESULT upon any failure.  */intxstrtod (str, ptr, result)     const char *str;     const char **ptr;     double *result;{  double val;  char *terminator;  int fail;  fail = 0;  errno = 0;  val = strtod (str, &terminator);  /* Having a non-zero terminator is an error only when PTR is NULL. */  if (terminator == str || (ptr == NULL && *terminator != '\0'))    fail = 1;  else    {      /* Allow underflow (in which case strtod returns zero),	 but flag overflow as an error. */      if (val != 0.0 && errno == ERANGE)	fail = 1;    }  if (ptr != NULL)    *ptr = terminator;  *result = val;  return fail;}