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