1 /* error-checking interface to strtod-like functions
3 Copyright (C) 1996, 1999, 2000, 2003, 2004, 2005, 2006 Free
4 Software Foundation, Inc.
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* Written by Jim Meyering. */
30 # define XSTRTOD xstrtold
31 # define DOUBLE long double
33 # define XSTRTOD xstrtod
34 # define DOUBLE double
37 /* An interface to a string-to-floating-point conversion function that
38 encapsulates all the error checking one should usually perform.
39 Like strtod/strtold, but upon successful
40 conversion put the result in *RESULT and return true. Return
41 false and don't modify *RESULT upon any failure. CONVERT
42 specifies the conversion function, e.g., strtod itself. */
45 XSTRTOD (char const *str, char const **ptr, DOUBLE *result,
46 DOUBLE (*convert) (char const *, char **))
53 val = convert (str, &terminator);
55 /* Having a non-zero terminator is an error only when PTR is NULL. */
56 if (terminator == str || (ptr == NULL && *terminator != '\0'))
60 /* Allow underflow (in which case CONVERT returns zero),
61 but flag overflow as an error. */
62 if (val != 0 && errno == ERANGE)