2 * strtod.c - This file is part of the libc-8086 package for ELKS,
3 * Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the Free
17 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 float strtod(const char *nptr, char **endptr)
25 unsigned short negative;
29 unsigned short exp_negative;
31 /* advance beyond any leading whitespace */
32 while (isspace(*nptr))
35 /* check for optional '+' or '-' */
40 } else if (*nptr == '+')
44 while (isdigit(*nptr)) {
45 number = number * 10 + (*nptr - '0');
52 while (isdigit(*nptr)) {
53 fp_part = fp_part / 10.0 + (*nptr - '0') / 10.0;
59 if (*nptr == 'e' || *nptr == 'E') {
65 } else if (*nptr == '+')
69 while (isdigit(*nptr)) {
70 exponent = exponent * 10 + (*nptr - '0');
82 return (negative ? -number : number);