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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                 :      31035 : size_t mp_parse_num_base(const char *str, size_t len, int *base) {
      36                 :      31035 :     const byte *p = (const byte *)str;
      37         [ +  + ]:      31035 :     if (len <= 1) {
      38                 :      20172 :         goto no_prefix;
      39                 :            :     }
      40                 :      10863 :     unichar c = *(p++);
      41         [ +  + ]:      10863 :     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                 :      29810 :     no_prefix:
      59         [ +  + ]:      29810 :         if (*base == 0) {
      60                 :      27527 :             *base = 10;
      61                 :            :         }
      62                 :            :     }
      63                 :      31035 :     return p - (const byte *)str;
      64                 :            : }