C struct initializations

output

$ cc s-struct-initalization.c && ./a.out
foo 1 bar
biz 2 baz
beep 3 boop

s-struct-initalization.c

#include <stdio.h>
#include <string.h>

struct data_s {
  int type:4;
  char *buf;
  void *extra;
};

#define inspect(d) {                   \
  printf("%s %d %s\n",                 \
      d.buf, d.type, d.extra);         \
}

int
main (void) {

  {
    struct data_s data;
    data.type = 1;
    data.buf = "foo";
    data.extra = "bar";
    inspect(data);
  }

  {
    struct data_s data = { 2, "biz", "baz" };
    inspect(data);
  }

  {
    struct data_s data;
    memset(&data, 3, sizeof(data));
    data.buf = "beep";
    data.extra = "boop";
    inspect(data);
  }

  return 0;
}