linux FILE struct

FILE <== _IO_FILE

char* _IO_read_ptr;   /* Current read pointer */

char* _IO_read_end;   /* End of get area. */

char* _IO_read_base;  /* Start of putback+get area. */

char* _IO_write_base; /* Start of put area. */

char* _IO_write_ptr;  /* Current put pointer. */

char* _IO_write_end;  /* End of put area. */

char* _IO_buf_base;   /* Start of reserve area. */

char* _IO_buf_end;    /* End of reserve area. */

char *_IO_save_base; /* Pointer to start of non-current get area. */

char *_IO_backup_base;  /* Pointer to first valid character of backup area */

char *_IO_save_end; /* Pointer to end of non-current get area. */

struct _IO_marker *_markers;

struct _IO_FILE *_chain;

int _fileno;

printf("_IO_read_ptr;  %x\n"

"_IO_read_end;    %x\n"

"_IO_read_base;   %x\n"

"_IO_write_base;  %x\n"

"_IO_write_ptr;   %x\n"

"_IO_write_end;   %x\n"

"_IO_buf_base;    %x\n"

"_IO_buf_end;     %x\n"

"_IO_save_base;   %x\n"

"_IO_backup_base;    %x\n"

"_IO_save_end; %x\n"

"_fileno : %x\n",

fp->_IO_read_ptr, 

fp->_IO_read_end, 

fp->_IO_read_base,

fp->_IO_write_base,

fp->_IO_write_ptr,

fp->_IO_write_end,

fp->_IO_buf_base, 

fp->_IO_buf_end,  

fp->_IO_save_base,

fp->_IO_backup_base, 

fp->_IO_save_end, 

fp->_fileno);