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  1. #include <stdio.h>
  2. #include <stdint.h>
  3. #include <stddef.h>
  4. #include <stdbool.h>
  5. #include <limits.h>
  6.  
  7. uint8_t ee_fat[10] = {0,};
  8.  
  9. bool getBit (uint8_t* p, size_t index) {
  10. 	const size_t entrySize = sizeof(p[0]) * CHAR_BIT;
  11. 	return p[index / entrySize] & (1 << (index % entrySize));
  12. }
  13. void setBit (uint8_t* p, size_t index, bool value) {
  14. 	const size_t entrySize = sizeof(p[0]) * CHAR_BIT;
  15. 	const size_t bit = index % entrySize;
  16. 	p[index / entrySize] = (p[index / entrySize] & ~(1 << bit)) | (value << bit);
  17. }
  18.  
  19. void print (uint8_t* p, size_t length) {
  20. 	for (size_t i = 0; i < length; ++i) {
  21. 		for (size_t j = 0; j < CHAR_BIT * sizeof(p[0]); ++j) {
  22. 			printf ("%d, ", (p[i] >> j) & 1);
  23. 		}
  24. 	}
  25. 	printf ("\n");
  26. }
  27.  
  28. int main () {
  29. 	setBit (ee_fat, 7, 1);
  30. 	setBit (ee_fat, 42, 1);
  31. 	print (ee_fat, sizeof(ee_fat)/sizeof(ee_fat[0]));
  32. 	printf ("%d\n", getBit (ee_fat, 7));
  33. 	printf ("%d\n", getBit (ee_fat, 42));
  34. }
Success #stdin #stdout 0s 9432KB
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stdin
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Standard input is empty
stdout
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0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
1
1
https://ideone.com/7aKmc9
language:
C (gcc 8.3)
created:
8 years ago
visibility:
secret

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