JunkCode.karma++; /* br10_stim.c */

問題: このコードは何でしょう？ :9
[Q. This code for what? :9]

#include <stdio.h>
#include <stdint.h>

#define MSK16(i, b)      ((i) & ((uint16_t)0x0001 << (b)))
#define SLL16(i, b)      ((uint16_t)(i) << (b))
#define SLR16(i, b)      ((uint16_t)(i) >> (b))
#define ORG16(i, b)      (SLR16(MSK16((i), (b)), (b)))
#define MOV16(i, b1, b2) (SLL16(ORG16((i), (b1)), (b2)))

uint16_t br10(uint16_t i) {
 uint8_t b;
 uint16_t bri;

 for (bri = 0x0000, b = 0; b < 10; b++) {
  bri |= MOV16(i, b, (10 - 1) - b);
 }

 return bri;
}

int main(int argc, char *argv[]) {
 uint16_t i, bri, brbri;

 for (i = 0x0000; i < SLL16(0x0001, 10); i++) {
  bri   = br10(i);
  brbri = br10(bri);
  printf("%4d <-BR10-> %4d <-BR10-> %4d ... %s\n",
   i, bri, brbri, (i == brbri) ? "OK" : "NG");
 }

 return 0;
}