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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. static unsigned char* read_bits(const unsigned char *src, int offset, int nbits){
  5. 	int bit, byte, bit_position;
  6. 	unsigned char *s = calloc(1, nbits + 1);
  7. 	if(s){
  8. 		--nbits;
  9. 		for(bit = offset; nbits >= 0; ++bit, --nbits){
  10. 			byte = bit / 8;
  11. 			bit_position = bit % 8;
  12. 			s[nbits] = (src[byte] >> bit_position) & 1;
  13. 		}
  14. 	}
  15. 	return s;
  16. }
  17.  
  18. int main(void) {
  19. 	unsigned char *x = "oo";
  20. 	printf("%s -> %s\n", x, read_bits(x, 0, 16)); //should print "oo -> 0110111101101111"
  21. 	return 0;
  22. }
  23.  
  24.  
  25.  
Success #stdin #stdout 0s 2380KB
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stdin
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Standard input is empty
stdout
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oo ->
https://ideone.com/v1BJCV
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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