Struct __sFILE

struct __sFILE;

Description

Stdio state variables.

The following always hold:

if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR), _lbfsize is -_bf._size, else _lbfsize is 0 if _flags&__SRD, _w is 0 if _flags&__SWR, _r is 0

This ensures that the getc and putc macros (or inline functions) never try to write or read from a file that is in `read' or `write' mode. (Moreover, they can, and do, automatically switch from read mode to write mode, and back, on "r+" and "w+" files.)

_lbfsize is used only to make the inline line-buffered output stream code as compact as possible.

_ub, _up, and _ur are used when ungetc(int,FILE *) pushes back more characters than fit in the current _bf, or when ungetc(int,FILE *) pushes back a character that does not match the previous one in _bf. When this happens, _ub._base becomes non-nil (i.e., a stream has ungetc(int,FILE *) data iff _ub._base!=NULL) and _up and _ur save the current values of _p and _r.

Members

Defined in __sFILE:

• _bf
• _blksize
• _close
• _cookie
• _data
• _file
• _flags
• _lb
• _lbfsize
• _nbuf
• _offset
• _p
• _r
• _read
• _seek
• _ub
• _ubuf
• _up
• _ur
• _w
• _write

unsigned char * _p;

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int _r;

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int _w;

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short _flags;

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short _file;

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__sbuf _bf;

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int _lbfsize;

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void * _cookie;

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int(* _read)(void *_cookie, char *_buf, int _n);

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int(* _write)(void *_cookie, const char *_buf, int _n);

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_fpos_t(* _seek)(void *_cookie, _fpos_t _offset, int _whence);

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int(* _close)(void *_cookie);

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__sbuf _ub;

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unsigned char * _up;

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int _ur;

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unsigned char _ubuf[3];

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unsigned char _nbuf[1];

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__sbuf _lb;

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int _blksize;

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int _offset;

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_reent * _data;

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