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  1. #include <stdlib.h>
  2. #include <stdio.h>
  3. #include <string.h>
  4.  
  5. unsigned char data[1024] = {0};
  6. unsigned char * data_ptr = data;
  7.  
  8. char input[1024] = {0};
  9. char * input_ptr = input;
  10.  
  11. char output[1024] = {0};
  12. char * output_ptr = output;
  13.  
  14. size_t run(char * code, size_t code_len, size_t code_pos, int deep)
  15. {
  16.    size_t i, begin, end;
  17.    for(i = code_pos; i < code_len; i++)
  18.    {
  19.       switch(code[i])
  20.       {
  21.          case '+': (*data_ptr)++; break;
  22.          case '-': (*data_ptr)--; break;
  23.          case '>': data_ptr++; break;
  24.          case '<': data_ptr--; break;
  25.          case ',': *data_ptr = *input_ptr; input_ptr++; break;
  26.          case '.': *output_ptr = *data_ptr; output_ptr++; break;
  27.          case ']': return i;
  28.          case '[':
  29.             begin = i;
  30.             while(*data_ptr)
  31.             {
  32.                code_pos = begin + 1;
  33.                end = run(code, code_len, code_pos, deep + 1);
  34.             }
  35.             i = end;
  36.             break;
  37.       }
  38.       if(deep && i == code_len - 1)
  39.          abort();
  40.    }
  41.  
  42.    return 0;
  43. }
  44.  
  45. char * brain_luck(char * code, char * _input)
  46. {
  47.    strcpy(input, _input);
  48.  
  49.    printf("Code: '%s'\n", code);
  50.    printf("Input: '%s'\n", input);
  51.    run(code, strlen(code), 0, 0);
  52.    printf("\nOutput: '%s'\n", output);
  53.  
  54.    char * result = (char *)malloc(strlen(output));
  55.    strcpy(result, output);
  56.    return result;
  57. }
  58.  
  59. int main()
  60. {
  61.    brain_luck(",[.[-],]", "test");
  62. }
  63.  
Success #stdin #stdout 0s 10304KB
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Standard input is empty
stdout
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Code: ',[.[-],]'
Input: 'test'

Output: 'test'
https://ideone.com/7RspWD
language:
C (gcc 8.3)
created:
8 years ago
visibility:
secret

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