Source

musing / bitfields / main.c

#include<stdio.h>
// trying to keep the linux kernel standard
// while going through the C standard - http://www.kernel.org/doc/Documentation/CodingStyle
// Testing bitfields

 struct flags {
  // declares a field 4 bits wide
  unsigned int f1:1 ; 
  unsigned int f2:1 ; 
  unsigned int f3:1 ; 
  unsigned int f4:1 ; 
  unsigned int f5:1 ; 
  unsigned int f6:1 ; 
  unsigned int f7:1 ; 
  unsigned int f8:1 ; 
  //... 32 flags 
} ;

int main(int args, char** argv) {
  struct flags f;
  f.f1 = 1;
  printf("%d %d %d \n",f.f1, f.f2, f.f3);
  // compile warning
  // storing a huge value in one bit field
  // f.f2 = 3; 
  // printf("%d %d %d \n",f.f1, f.f2, f.f3);
}
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