strtokの挙動

test-strtok.c

#include <string.h>
#include <stdio.h>
#define SIZE 10

int main() {

  int  i = 0;
  char data[] = "foo bar piyo fuga";
  char *argv[SIZE];
  
  argv[i] = strtok(data, " ");
  do
    {
      argv[++i] = strtok(NULL, " ");
    } while ( (i < SIZE) && (argv[i] != NULL));
  
  printf("%s\n", argv[0]);
  printf("%s\n", argv[1]);
  printf("%s\n", argv[2]);
  return 0;
}