_iobuf

Metadatacopy
struct _iobuf {
    char* _ptr;/* 0x0  4 */
    int _cnt;/* 0x4  4 */
    char* _base;/* 0x8  4 */
    int _flag;/* 0xc  4 */
    int _file;/* 0x10  4 */
    int _charbuf;/* 0x14  4 */
    int _bufsiz;/* 0x18  4 */
    char* _tmpfname;/* 0x1c  4 */
};
/* source: Windows 2000 RC2 DDK Alpha libcntpr.lib CodeView type records; build 2128 per the DDK's ntverp.h */