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1 : : /* 2 : : * This file is part of the MicroPython project, http://micropython.org/ 3 : : * 4 : : * The MIT License (MIT) 5 : : * 6 : : * Copyright (c) 2013, 2014 Damien P. George 7 : : * 8 : : * Permission is hereby granted, free of charge, to any person obtaining a copy 9 : : * of this software and associated documentation files (the "Software"), to deal 10 : : * in the Software without restriction, including without limitation the rights 11 : : * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 12 : : * copies of the Software, and to permit persons to whom the Software is 13 : : * furnished to do so, subject to the following conditions: 14 : : * 15 : : * The above copyright notice and this permission notice shall be included in 16 : : * all copies or substantial portions of the Software. 17 : : * 18 : : * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 : : * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 : : * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 21 : : * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 22 : : * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 23 : : * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 24 : : * THE SOFTWARE. 25 : : */ 26 : : 27 : : #include "py/mpconfig.h" 28 : : #include "py/misc.h" 29 : : #include "py/parsenumbase.h" 30 : : 31 : : // find real radix base, and strip preceding '0x', '0o' and '0b' 32 : : // puts base in *base, and returns number of bytes to skip the prefix 33 : : // in base-0, puts 1 in *base to indicate a number that starts with 0, to provoke a 34 : : // ValueError if it's not all-digits-zero. 35 : 30726 : size_t mp_parse_num_base(const char *str, size_t len, int *base) { 36 : 30726 : const byte *p = (const byte *)str; 37 [ + + ]: 30726 : if (len <= 1) { 38 : 20036 : goto no_prefix; 39 : : } 40 : 10690 : unichar c = *(p++); 41 [ + + ]: 10690 : if (c == '0') { 42 : 1225 : c = *(p++) | 32; 43 : 1225 : int b = *base; 44 [ + + + - ]: 1225 : if (c == 'x' && (b == 0 || b == 16)) { 45 : 1065 : *base = 16; 46 [ + + + - ]: 160 : } else if (c == 'o' && (b == 0 || b == 8)) { 47 : 40 : *base = 8; 48 [ + + + - ]: 120 : } else if (c == 'b' && (b == 0 || b == 2)) { 49 : 36 : *base = 2; 50 : : } else { 51 : 84 : p -= 2; 52 [ + + ]: 84 : if (b == 0) { 53 : 20 : *base = 1; 54 : : } 55 : : } 56 : : } else { 57 : : p--; 58 : 29501 : no_prefix: 59 [ + + ]: 29501 : if (*base == 0) { 60 : 27284 : *base = 10; 61 : : } 62 : : } 63 : 30726 : return p - (const byte *)str; 64 : : }