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 2, or (at your option)
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, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
20 /* Written by Jim Meyering. */
33 # define XSTRTOD xstrtold
34 # define DOUBLE long double
36 # define XSTRTOD xstrtod
37 # define DOUBLE double
40 /* An interface to a string-to-floating-point conversion function that
41 encapsulates all the error checking one should usually perform.
42 Like strtod/strtold, but upon successful
43 conversion put the result in *RESULT and return true. Return
44 false and don't modify *RESULT upon any failure. CONVERT
45 specifies the conversion function, e.g., strtod itself. */
48 XSTRTOD (char const *str, char const **ptr, DOUBLE *result,
49 DOUBLE (*convert) (char const *, char **))
56 val = convert (str, &terminator);
58 /* Having a non-zero terminator is an error only when PTR is NULL. */
59 if (terminator == str || (ptr == NULL && *terminator != '\0'))
63 /* Allow underflow (in which case CONVERT returns zero),
64 but flag overflow as an error. */
65 if (val != 0 && errno == ERANGE)