mirror of https://gitee.com/openkylin/linux.git
46 lines
934 B
C
46 lines
934 B
C
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/*
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* stdlib functions
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*
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* Author: Scott Wood <scottwood@freescale.com>
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*
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* Copyright (c) 2007 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include "stdlib.h"
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/* Not currently supported: leading whitespace, sign, 0x prefix, zero base */
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unsigned long long int strtoull(const char *ptr, char **end, int base)
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{
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unsigned long long ret = 0;
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if (base > 36)
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goto out;
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while (*ptr) {
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int digit;
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if (*ptr >= '0' && *ptr <= '9' && *ptr < '0' + base)
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digit = *ptr - '0';
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else if (*ptr >= 'A' && *ptr < 'A' + base - 10)
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digit = *ptr - 'A' + 10;
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else if (*ptr >= 'a' && *ptr < 'a' + base - 10)
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digit = *ptr - 'a' + 10;
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else
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break;
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ret *= base;
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ret += digit;
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ptr++;
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}
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out:
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if (end)
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*end = (char *)ptr;
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return ret;
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}
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