1/* 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} 46