1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * stdlib functions 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Author: Scott Wood <scottwood@freescale.com> 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * Copyright (c) 2007 Freescale Semiconductor, Inc. 8*4882a593Smuzhiyun */ 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #include "stdlib.h" 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun /* Not currently supported: leading whitespace, sign, 0x prefix, zero base */ strtoull(const char * ptr,char ** end,int base)13*4882a593Smuzhiyununsigned long long int strtoull(const char *ptr, char **end, int base) 14*4882a593Smuzhiyun { 15*4882a593Smuzhiyun unsigned long long ret = 0; 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun if (base > 36) 18*4882a593Smuzhiyun goto out; 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun while (*ptr) { 21*4882a593Smuzhiyun int digit; 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun if (*ptr >= '0' && *ptr <= '9' && *ptr < '0' + base) 24*4882a593Smuzhiyun digit = *ptr - '0'; 25*4882a593Smuzhiyun else if (*ptr >= 'A' && *ptr < 'A' + base - 10) 26*4882a593Smuzhiyun digit = *ptr - 'A' + 10; 27*4882a593Smuzhiyun else if (*ptr >= 'a' && *ptr < 'a' + base - 10) 28*4882a593Smuzhiyun digit = *ptr - 'a' + 10; 29*4882a593Smuzhiyun else 30*4882a593Smuzhiyun break; 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun ret *= base; 33*4882a593Smuzhiyun ret += digit; 34*4882a593Smuzhiyun ptr++; 35*4882a593Smuzhiyun } 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun out: 38*4882a593Smuzhiyun if (end) 39*4882a593Smuzhiyun *end = (char *)ptr; 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun return ret; 42*4882a593Smuzhiyun } 43