148 строки
3.6 KiB
C++
148 строки
3.6 KiB
C++
/* This file is part of Libspectre.
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*
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* Copyright (C) 2007 Albert Astals Cid <aacid@kde.org>
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* Copyright (C) 2007 Carlos Garcia Campos <carlosgc@gnome.org>
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*
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* Libspectre is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* Libspectre is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/* This function comes from spectre-utils from libspectre */
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#include "gstrtod.h"
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#include <clocale>
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#include <cerrno>
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#include <cstdlib>
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#include <cstring>
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#define ascii_isspace(c) \
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(c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')
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#define ascii_isdigit(c) \
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(c >= '0' && c <= '9')
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double gatof(const char *nptr)
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{
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return gstrtod(nptr, NULL);
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}
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double gstrtod(const char *nptr, char **endptr)
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{
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char *fail_pos;
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double val;
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struct lconv *locale_data;
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const char *decimal_point;
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int decimal_point_len;
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const char *p, *decimal_point_pos;
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const char *end = NULL; /* Silence gcc */
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int strtod_errno;
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fail_pos = NULL;
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locale_data = localeconv ();
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decimal_point = locale_data->decimal_point;
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decimal_point_len = strlen (decimal_point);
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decimal_point_pos = NULL;
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end = NULL;
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if (decimal_point[0] != '.' || decimal_point[1] != 0) {
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p = nptr;
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/* Skip leading space */
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while (ascii_isspace (*p))
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p++;
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/* Skip leading optional sign */
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if (*p == '+' || *p == '-')
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p++;
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if (ascii_isdigit (*p) || *p == '.') {
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while (ascii_isdigit (*p))
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p++;
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if (*p == '.')
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decimal_point_pos = p++;
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while (ascii_isdigit (*p))
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p++;
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if (*p == 'e' || *p == 'E')
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p++;
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if (*p == '+' || *p == '-')
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p++;
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while (ascii_isdigit (*p))
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p++;
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end = p;
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}
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/* For the other cases, we need not convert the decimal point */
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}
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if (decimal_point_pos) {
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char *copy, *c;
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/* We need to convert the '.' to the locale specific decimal point */
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copy = (char *) malloc (end - nptr + 1 + decimal_point_len);
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c = copy;
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memcpy (c, nptr, decimal_point_pos - nptr);
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c += decimal_point_pos - nptr;
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memcpy (c, decimal_point, decimal_point_len);
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c += decimal_point_len;
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memcpy (c, decimal_point_pos + 1, end - (decimal_point_pos + 1));
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c += end - (decimal_point_pos + 1);
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*c = 0;
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errno = 0;
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val = strtod (copy, &fail_pos);
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strtod_errno = errno;
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if (fail_pos) {
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if (fail_pos - copy > decimal_point_pos - nptr)
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fail_pos = (char *)nptr + (fail_pos - copy) - (decimal_point_len - 1);
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else
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fail_pos = (char *)nptr + (fail_pos - copy);
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}
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free (copy);
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} else if (end) {
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char *copy;
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copy = (char *) malloc (end - (char *)nptr + 1);
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memcpy (copy, nptr, end - nptr);
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*(copy + (end - (char *)nptr)) = 0;
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errno = 0;
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val = strtod (copy, &fail_pos);
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strtod_errno = errno;
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if (fail_pos) {
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fail_pos = (char *)nptr + (fail_pos - copy);
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}
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free (copy);
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} else {
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errno = 0;
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val = strtod (nptr, &fail_pos);
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strtod_errno = errno;
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}
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if (endptr)
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*endptr = fail_pos;
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errno = strtod_errno;
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return val;
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}
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