72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "py/mpconfig.h"
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#include "py/misc.h"
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#include "py/parsenumbase.h"
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// find real radix base, and strip preceding '0x', '0o' and '0b'
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// puts base in *base, and returns number of bytes to skip the prefix
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size_t mp_parse_num_base(const char *str, size_t len, int *base) {
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const byte *p = (const byte *)str;
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if (len <= 1) {
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goto no_prefix;
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}
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unichar c = *(p++);
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if ((*base == 0 || *base == 16) && c == '0') {
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c = *(p++);
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if ((c | 32) == 'x') {
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*base = 16;
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} else if (*base == 0 && (c | 32) == 'o') {
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*base = 8;
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} else if (*base == 0 && (c | 32) == 'b') {
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*base = 2;
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} else {
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if (*base == 0) {
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*base = 10;
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}
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p -= 2;
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}
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} else if (*base == 8 && c == '0') {
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c = *(p++);
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if ((c | 32) != 'o') {
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p -= 2;
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}
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} else if (*base == 2 && c == '0') {
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c = *(p++);
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if ((c | 32) != 'b') {
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p -= 2;
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}
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} else {
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p--;
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no_prefix:
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if (*base == 0) {
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*base = 10;
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}
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}
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return p - (const byte *)str;
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}
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