FILE structure in stdio.h

[Nagesh Pabbisetty]

Here is an easy one for the wizards:

On Sun3, /usr/include/stdio reads as follows:

extern  struct  _iobuf {
        int     _cnt;
        unsigned char *_ptr;
        unsigned char *_base;
        int     _bufsiz;
        short   _flag;
        char    _file;          /* should be short */
} _iob[];

Could someone tell me 
	1."what" is stored in each of these fields? OR
	2. What is their significance.


	
Thanks....


Nagesh