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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
/*
* $Id$
*
* "g_ascii_strtoull()" extracted from GLib 2.4.5, for use with GLibs
* that don't have it (e.g., GLib 1.2[.x]).
*/
/*
* MT safe
*/
#include <errno.h>
#include <glib.h>
#include "g_ascii_strtoull.h"
#ifndef G_MAXUINT64
#define G_MAXUINT64 ((guint64)G_GINT64_CONSTANT(0xFFFFFFFFFFFFFFFFU))
#endif
/**
* g_ascii_strtoull:
* @nptr: the string to convert to a numeric value.
* @endptr: if non-%NULL, it returns the character after
* the last character used in the conversion.
* @base: to be used for the conversion, 2..36 or 0
*
* Converts a string to a #guint64 value.
* This function behaves like the standard strtoull() function
* does in the C locale. It does this without actually
* changing the current locale, since that would not be
* thread-safe.
*
* This function is typically used when reading configuration
* files or other non-user input that should be locale independent.
* To handle input from the user you should normally use the
* locale-sensitive system strtoull() function.
*
* If the correct value would cause overflow, %G_MAXUINT64
* is returned, and %ERANGE is stored in %errno.
*
* Return value: the #guint64 value.
*
* Since: 2.2
**/
guint64
g_ascii_strtoull (const gchar *nptr,
gchar **endptr,
guint base)
{
/* this code is based on on the strtol(3) code from GNU libc released under
* the GNU Lesser General Public License.
*
* Copyright (C) 1991,92,94,95,96,97,98,99,2000,01,02
* Free Software Foundation, Inc.
*/
#define ISSPACE(c) ((c) == ' ' || (c) == '\f' || (c) == '\n' || \
(c) == '\r' || (c) == '\t' || (c) == '\v')
#define ISUPPER(c) ((c) >= 'A' && (c) <= 'Z')
#define ISLOWER(c) ((c) >= 'a' && (c) <= 'z')
#define ISALPHA(c) (ISUPPER (c) || ISLOWER (c))
#define TOUPPER(c) (ISLOWER (c) ? (c) - 'a' + 'A' : (c))
#define TOLOWER(c) (ISUPPER (c) ? (c) - 'A' + 'a' : (c))
gboolean negative, overflow;
guint64 cutoff;
guint64 cutlim;
guint64 ui64;
const gchar *s, *save;
guchar c;
if (base == 1 || base > 36)
{
errno = EINVAL;
return 0;
}
save = s = nptr;
/* Skip white space. */
while (ISSPACE (*s))
++s;
if (!*s)
goto noconv;
/* Check for a sign. */
negative = FALSE;
if (*s == '-')
{
negative = TRUE;
++s;
}
else if (*s == '+')
++s;
/* Recognize number prefix and if BASE is zero, figure it out ourselves. */
if (*s == '0')
{
if ((base == 0 || base == 16) && TOUPPER (s[1]) == 'X')
{
s += 2;
base = 16;
}
else if (base == 0)
base = 8;
}
else if (base == 0)
base = 10;
/* Save the pointer so we can check later if anything happened. */
save = s;
cutoff = G_MAXUINT64 / base;
cutlim = G_MAXUINT64 % base;
overflow = FALSE;
ui64 = 0;
c = *s;
for (; c; c = *++s)
{
if (c >= '0' && c <= '9')
c -= '0';
else if (ISALPHA (c))
c = TOUPPER (c) - 'A' + 10;
else
break;
if (c >= base)
break;
/* Check for overflow. */
if (ui64 > cutoff || (ui64 == cutoff && c > cutlim))
overflow = TRUE;
else
{
ui64 *= base;
ui64 += c;
}
}
/* Check if anything actually happened. */
if (s == save)
goto noconv;
/* Store in ENDPTR the address of one character
past the last character we converted. */
if (endptr)
*endptr = (gchar*) s;
if (overflow)
{
errno = ERANGE;
return G_MAXUINT64;
}
/* Return the result of the appropriate sign. */
return negative ? -ui64 : ui64;
noconv:
/* We must handle a special case here: the base is 0 or 16 and the
first two characters are '0' and 'x', but the rest are no
hexadecimal digits. This is no error case. We return 0 and
ENDPTR points to the `x`. */
if (endptr)
{
if (save - nptr >= 2 && TOUPPER (save[-1]) == 'X'
&& save[-2] == '0')
*endptr = (gchar*) &save[-1];
else
/* There was no number to convert. */
*endptr = (gchar*) nptr;
}
return 0;
}
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