c – fseek现在支持大文件

这是什么时候发生的？

#include <cstdio>
#include <cstdlib>
void writeF(const char*fname,size_t nItems){
  FILE *fp=NULL;
  if(NULL==(fp=fopen(fname,"w"))){
    fprintf(stderr,"t-> problems opening file:%sn",fname);
    exit(0);
  }
  for(size_t i=0;i<nItems;i++)
    fwrite(&i,sizeof(size_t),1,fp);
  fclose(fp);
}
void getIt(const char *fname,size_t offset,int whence,int nItems){
  size_t ary[nItems];
  FILE *fp = fopen(fname,"r");
  fseek(fp,offset*sizeof(size_t),whence);
  fread(ary,nItems,fp);

  for(int i=0;i<nItems;i++)
    fprintf(stderr,"%lun",ary[i]);
  fclose(fp);
}


int main(){
  const char * fname = "temp.bin"; 
  writeF(fname,1000000000);//writefile
  getIt(fname,999999990,SEEK_SET,10);//get last 10 seek from start
  getIt(fname,-10,SEEK_END,10);//get last 10 seek from start
  return 0;
}

上面的代码用二进制size_t格式的1-10 ^ 9条目写一个大文件.
然后写入最后10个条目,从文件的开头搜索,并从文件末尾搜索.