blob: e00d58c29eea1fe428fd102ae43b20fbf6614b83 [file] [log] [blame]
Scott Wood9de78272007-09-06 05:21:10 +10001/*
2 * stdlib functions
3 *
4 * Author: Scott Wood <scottwood@freescale.com>
5 *
6 * Copyright (c) 2007 Freescale Semiconductor, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published
10 * by the Free Software Foundation.
11 */
12
13#include "stdlib.h"
14
15/* Not currently supported: leading whitespace, sign, 0x prefix, zero base */
16unsigned long long int strtoull(const char *ptr, char **end, int base)
17{
18 unsigned long long ret = 0;
19
20 if (base > 36)
21 goto out;
22
23 while (*ptr) {
24 int digit;
25
26 if (*ptr >= '0' && *ptr <= '9' && *ptr < '0' + base)
27 digit = *ptr - '0';
28 else if (*ptr >= 'A' && *ptr < 'A' + base - 10)
29 digit = *ptr - 'A' + 10;
30 else if (*ptr >= 'a' && *ptr < 'a' + base - 10)
31 digit = *ptr - 'a' + 10;
32 else
33 break;
34
35 ret *= base;
36 ret += digit;
37 ptr++;
38 }
39
40out:
41 if (end)
42 *end = (char *)ptr;
43
44 return ret;
45}