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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <stdlib.h>
  4.  
  5. int check_bytes(const char * const data, size_t length, const char val)
  6. {
  7.     if(length == 0) return 1;
  8.     if(*data != val) return 0;
  9.     return memcmp(data, data+1, length-1) ? 0 : 1;
  10. }
  11.  
  12. int main(void) {
  13. 	const size_t LEN = 12345;
  14. 	char * data0 = calloc(1, LEN);
  15. 	char * data1 = calloc(1, LEN);
  16. 	data1[1234] = 5;
  17.  
  18. 	printf("Data 0 should be all-0: %s\n", check_bytes(data0, LEN, 0) ? "yes": "no");
  19. 	printf("Data 1 should NOT be all-0: %s\n", check_bytes(data1, LEN, 0) ? "yes": "no");
  20. 	return 0;
  21. }
  22.  
Success #stdin #stdout 0s 2304KB
comments (?)
stdin
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Standard input is empty
stdout
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Data 0 should be all-0: yes
Data 1 should NOT be all-0: no
https://ideone.com/BJro86
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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