debug/programs/debug.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <stdint.h>
   4 #include <stdlib.h>
   5
   6 unsigned int crc32a(uint8_t *message, unsigned int size);
   7
   8 void rot13(char *buf)
   9 {
  10     while (*buf) {
  11         if ((*buf >= 'a' && *buf <= 'm') ||
  12                 (*buf >= 'A' && *buf <= 'M')) {
  13             *buf += 13;
  14         } else if ((*buf >= 'n' && *buf <= 'z') ||
  15                 (*buf >= 'N' && *buf <= 'Z')) {
  16             *buf -= 13;
  17         }
  18         buf++;
  19     }
  20 }
  21
  22 size_t strlen(const char *buf)
  23 {
  24     int len = 0;
  25     while (buf[len])
  26         len++;
  27     return len;
  28 }
  29
  30 extern void *__malloc_freelist;
  31
  32 int main()
  33 {
  34     __malloc_freelist = 0;
  35
  36     volatile int i = 0;
  37     int j = 0;
  38     char *fox = "The quick brown fox jumps of the lazy dog.";
  39     unsigned int checksum = 0;
  40
  41 start:
  42     while (i)
  43         j++;
  44
  45     rot13(fox);
  46     checksum ^= crc32a(fox, strlen(fox));
  47     rot13(fox);
  48     checksum ^= crc32a(fox, strlen(fox));
  49
  50     return checksum;
  51 }