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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. char checksum(char *Received) {
  5.     char *star = Received;
  6.     char *delim1 = "&";
  7.     char *delim2 = "*";
  8.     char result = 0;
  9.  
  10.     while (1) {
  11.         char *ptr = strtok(star, delim1);
  12.         if (!ptr) {
  13.             break;
  14.         }
  15.         star = strtok(NULL, delim2);
  16.         if (!star) {
  17.             break;
  18.         }
  19.         printf("ptr = %s star = %s\n", ptr, star);
  20.         if (ptr == star) {
  21.         	break;
  22.         }
  23.  
  24.         for (char *p = ptr; *p; p++) { 
  25.             result ^= *p; // XOR them into the result
  26.         }
  27.     }
  28.     return result;
  29. }
  30.  
  31. int main(void) {
  32. 	char str1[] = "foo &abcdef*bar&12345*xxx";
  33. 	char str2[] = "blah &wxyz*xxx&0987*qwerty&ppppp*x";
  34. 	char cs1 = checksum(str1);
  35. 	char cs2 = checksum(str2);
  36. 	printf("checksum 1 = %d checksum 2 = %d\n", cs1, cs2);
  37. 	return 0;
  38. }
  39.  
Success #stdin #stdout 0s 9424KB
comments (?)
stdin 
Standard input is empty
stdout 
ptr = foo  star = abcdef
ptr = blah  star = wxyz
checksum 1 = 70 checksum 2 = 39
https://ideone.com/WaUhK5
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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