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/* This file is part of Libspectre.
*
* Copyright (C) 2007, 2012 Albert Astals Cid <aacid@kde.org>
* Copyright (C) 2007 Carlos Garcia Campos <carlosgc@gnome.org>
*
* Libspectre 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.
*
* Libspectre 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/* This function comes from spectre-utils from libspectre */
#include "gstrtod.h"
#include <locale.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#define ascii_isspace(c) \
(c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')
#define ascii_isdigit(c) \
(c >= '0' && c <= '9')
double gatof(const char *nptr)
{
return gstrtod(nptr, NULL);
}
double gstrtod(const char *nptr, char **endptr)
{
char *fail_pos;
double val;
struct lconv *locale_data;
const char *decimal_point;
int decimal_point_len;
const char *p, *decimal_point_pos;
const char *end = NULL; /* Silence gcc */
int strtod_errno;
fail_pos = NULL;
locale_data = localeconv ();
decimal_point = locale_data->decimal_point;
decimal_point_len = strlen (decimal_point);
decimal_point_pos = NULL;
end = NULL;
if (decimal_point[0] != '.' || decimal_point[1] != 0) {
p = nptr;
/* Skip leading space */
while (ascii_isspace (*p))
p++;
/* Skip leading optional sign */
if (*p == '+' || *p == '-')
p++;
if (ascii_isdigit (*p) || *p == '.') {
while (ascii_isdigit (*p))
p++;
if (*p == '.')
decimal_point_pos = p++;
while (ascii_isdigit (*p))
p++;
if (*p == 'e' || *p == 'E')
p++;
if (*p == '+' || *p == '-')
p++;
while (ascii_isdigit (*p))
p++;
end = p;
}
/* For the other cases, we need not convert the decimal point */
}
if (decimal_point_pos) {
char *copy, *c;
/* We need to convert the '.' to the locale specific decimal point */
copy = (char *) malloc (end - nptr + 1 + decimal_point_len);
c = copy;
memcpy (c, nptr, decimal_point_pos - nptr);
c += decimal_point_pos - nptr;
memcpy (c, decimal_point, decimal_point_len);
c += decimal_point_len;
memcpy (c, decimal_point_pos + 1, end - (decimal_point_pos + 1));
c += end - (decimal_point_pos + 1);
*c = 0;
errno = 0;
val = strtod (copy, &fail_pos);
strtod_errno = errno;
if (fail_pos) {
if (fail_pos - copy > decimal_point_pos - nptr)
fail_pos = (char *)nptr + (fail_pos - copy) - (decimal_point_len - 1);
else
fail_pos = (char *)nptr + (fail_pos - copy);
}
free (copy);
} else if (end) {
char *copy;
copy = (char *) malloc (end - (char *)nptr + 1);
memcpy (copy, nptr, end - nptr);
*(copy + (end - (char *)nptr)) = 0;
errno = 0;
val = strtod (copy, &fail_pos);
strtod_errno = errno;
if (fail_pos) {
fail_pos = (char *)nptr + (fail_pos - copy);
}
free (copy);
} else {
errno = 0;
val = strtod (nptr, &fail_pos);
strtod_errno = errno;
}
if (endptr)
*endptr = fail_pos;
errno = strtod_errno;
return val;
}
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