?? xstrtod.c
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/* 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;}
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