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< * $FreeBSD: head/lib/libc/stdio/local.h 178287 2008-04-17 22:17:54Z jhb $
---
> * $FreeBSD: head/lib/libc/stdio/local.h 178721 2008-05-02 15:25:07Z jhb $
42,43c42,48
< * Information local to this implementation of stdio,
< * in particular, macros and private variables.
---
> * Information local to this implementation of stdio, in particular,
> * macros, private functions, private variables, and the definition of
> * FILE.
> *
> * NB: to fit things in six character monocase externals, the stdio
> * code uses the prefix `__s' for stdio objects, typically followed
> * by a three-character attempt at a mnemonic.
45a51,141
> /* stdio buffers */
> struct __sbuf {
> unsigned char *_base;
> int _size;
> };
>
> /*
> * 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() pushes back more characters
> * than fit in the current _bf, or when ungetc() 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() data iff
> * _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
> *
> * Certain members of __sFILE are accessed directly via macros or
> * inline functions. To preserve ABI compat, these members must not
> * be disturbed. These members are marked below with (*).
> */
> struct __sFILE {
> unsigned char *_p; /* (*) current position in (some) buffer */
> int _r; /* (*) read space left for getc() */
> int _w; /* (*) write space left for putc() */
> short _flags; /* (*) flags, below; this FILE is free if 0 */
> short _file; /* (*) fileno, if Unix descriptor, else -1 */
> struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
> int _lbfsize; /* (*) 0 or -_bf._size, for inline putc */
>
> /* operations */
> void *_cookie; /* cookie passed to io functions */
> int (*_close)(void *);
> int (*_read)(void *, char *, int);
> fpos_t (*_seek)(void *, fpos_t, int);
> int (*_write)(void *, const char *, int);
>
> /* separate buffer for long sequences of ungetc() */
> struct __sbuf _ub; /* ungetc buffer */
> unsigned char *_up; /* saved _p when _p is doing ungetc data */
> int _ur; /* saved _r when _r is counting ungetc data */
>
> /* tricks to meet minimum requirements even when malloc() fails */
> unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */
> unsigned char _nbuf[1]; /* guarantee a getc() buffer */
>
> /* separate buffer for fgetln() when line crosses buffer boundary */
> struct __sbuf _lb; /* buffer for fgetln() */
>
> /* Unix stdio files get aligned to block boundaries on fseek() */
> int _blksize; /* stat.st_blksize (may be != _bf._size) */
> fpos_t _offset; /* current lseek offset */
>
> pthread_mutex_t _fl_mutex; /* used for MT-safety */
> pthread_t _fl_owner; /* current owner */
> int _fl_count; /* recursive lock count */
> int _orientation; /* orientation for fwide() */
> mbstate_t _mbstate; /* multibyte conversion state */
> };
>
> #define __SLBF 0x0001 /* line buffered */
> #define __SNBF 0x0002 /* unbuffered */
> #define __SRD 0x0004 /* OK to read */
> #define __SWR 0x0008 /* OK to write */
> /* RD and WR are never simultaneously asserted */
> #define __SRW 0x0010 /* open for reading & writing */
> #define __SEOF 0x0020 /* found EOF */
> #define __SERR 0x0040 /* found error */
> #define __SMBF 0x0080 /* _buf is from malloc */
> #define __SAPP 0x0100 /* fdopen()ed in append mode */
> #define __SSTR 0x0200 /* this is an sprintf/snprintf string */
> #define __SOPT 0x0400 /* do fseek() optimization */
> #define __SNPT 0x0800 /* do not do fseek() optimization */
> #define __SOFF 0x1000 /* set iff _offset is in fact correct */
> #define __SMOD 0x2000 /* true => fgetln modified _p text */
> #define __SALC 0x4000 /* allocate string space dynamically */
> #define __SIGN 0x8000 /* ignore this file in _fwalk */
>
59a156,157
> extern int __srget(FILE *);
> extern int __swbuf(int, FILE *);
83a182,213
> * Get and store individual characters from a file stream.
> */
> #define __sgetc(p) (--(p)->_r < 0 ? __srget(p) : (int)(*(p)->_p++))
> #if defined(__GNUC__) && defined(__STDC__)
> static __inline int
> __sputc(int _c, FILE *_p)
> {
> if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != '\n'))
> return (*_p->_p++ = _c);
> else
> return (__swbuf(_c, _p));
> }
> #else
> /*
> * This has been tuned to generate reasonable code on the vax using pcc.
> */
> #define __sputc(c, p) \
> (--(p)->_w < 0 ? \
> (p)->_w >= (p)->_lbfsize ? \
> (*(p)->_p = (c)), *(p)->_p != '\n' ? \
> (int)*(p)->_p++ : \
> __swbuf('\n', p) : \
> __swbuf((int)(c), p) : \
> (*(p)->_p = (c), (int)*(p)->_p++))
> #endif
>
> /*
> * Return true if the file stream has encountered an error.
> */
> #define __sferror(p) (((p)->_flags & __SERR) != 0)
>
> /*
< * $FreeBSD: head/lib/libc/stdio/local.h 178287 2008-04-17 22:17:54Z jhb $
---
> * $FreeBSD: head/lib/libc/stdio/local.h 178721 2008-05-02 15:25:07Z jhb $
42,43c42,48
< * Information local to this implementation of stdio,
< * in particular, macros and private variables.
---
> * Information local to this implementation of stdio, in particular,
> * macros, private functions, private variables, and the definition of
> * FILE.
> *
> * NB: to fit things in six character monocase externals, the stdio
> * code uses the prefix `__s' for stdio objects, typically followed
> * by a three-character attempt at a mnemonic.
45a51,141
> /* stdio buffers */
> struct __sbuf {
> unsigned char *_base;
> int _size;
> };
>
> /*
> * 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() pushes back more characters
> * than fit in the current _bf, or when ungetc() 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() data iff
> * _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
> *
> * Certain members of __sFILE are accessed directly via macros or
> * inline functions. To preserve ABI compat, these members must not
> * be disturbed. These members are marked below with (*).
> */
> struct __sFILE {
> unsigned char *_p; /* (*) current position in (some) buffer */
> int _r; /* (*) read space left for getc() */
> int _w; /* (*) write space left for putc() */
> short _flags; /* (*) flags, below; this FILE is free if 0 */
> short _file; /* (*) fileno, if Unix descriptor, else -1 */
> struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
> int _lbfsize; /* (*) 0 or -_bf._size, for inline putc */
>
> /* operations */
> void *_cookie; /* cookie passed to io functions */
> int (*_close)(void *);
> int (*_read)(void *, char *, int);
> fpos_t (*_seek)(void *, fpos_t, int);
> int (*_write)(void *, const char *, int);
>
> /* separate buffer for long sequences of ungetc() */
> struct __sbuf _ub; /* ungetc buffer */
> unsigned char *_up; /* saved _p when _p is doing ungetc data */
> int _ur; /* saved _r when _r is counting ungetc data */
>
> /* tricks to meet minimum requirements even when malloc() fails */
> unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */
> unsigned char _nbuf[1]; /* guarantee a getc() buffer */
>
> /* separate buffer for fgetln() when line crosses buffer boundary */
> struct __sbuf _lb; /* buffer for fgetln() */
>
> /* Unix stdio files get aligned to block boundaries on fseek() */
> int _blksize; /* stat.st_blksize (may be != _bf._size) */
> fpos_t _offset; /* current lseek offset */
>
> pthread_mutex_t _fl_mutex; /* used for MT-safety */
> pthread_t _fl_owner; /* current owner */
> int _fl_count; /* recursive lock count */
> int _orientation; /* orientation for fwide() */
> mbstate_t _mbstate; /* multibyte conversion state */
> };
>
> #define __SLBF 0x0001 /* line buffered */
> #define __SNBF 0x0002 /* unbuffered */
> #define __SRD 0x0004 /* OK to read */
> #define __SWR 0x0008 /* OK to write */
> /* RD and WR are never simultaneously asserted */
> #define __SRW 0x0010 /* open for reading & writing */
> #define __SEOF 0x0020 /* found EOF */
> #define __SERR 0x0040 /* found error */
> #define __SMBF 0x0080 /* _buf is from malloc */
> #define __SAPP 0x0100 /* fdopen()ed in append mode */
> #define __SSTR 0x0200 /* this is an sprintf/snprintf string */
> #define __SOPT 0x0400 /* do fseek() optimization */
> #define __SNPT 0x0800 /* do not do fseek() optimization */
> #define __SOFF 0x1000 /* set iff _offset is in fact correct */
> #define __SMOD 0x2000 /* true => fgetln modified _p text */
> #define __SALC 0x4000 /* allocate string space dynamically */
> #define __SIGN 0x8000 /* ignore this file in _fwalk */
>
59a156,157
> extern int __srget(FILE *);
> extern int __swbuf(int, FILE *);
83a182,213
> * Get and store individual characters from a file stream.
> */
> #define __sgetc(p) (--(p)->_r < 0 ? __srget(p) : (int)(*(p)->_p++))
> #if defined(__GNUC__) && defined(__STDC__)
> static __inline int
> __sputc(int _c, FILE *_p)
> {
> if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != '\n'))
> return (*_p->_p++ = _c);
> else
> return (__swbuf(_c, _p));
> }
> #else
> /*
> * This has been tuned to generate reasonable code on the vax using pcc.
> */
> #define __sputc(c, p) \
> (--(p)->_w < 0 ? \
> (p)->_w >= (p)->_lbfsize ? \
> (*(p)->_p = (c)), *(p)->_p != '\n' ? \
> (int)*(p)->_p++ : \
> __swbuf('\n', p) : \
> __swbuf((int)(c), p) : \
> (*(p)->_p = (c), (int)*(p)->_p++))
> #endif
>
> /*
> * Return true if the file stream has encountered an error.
> */
> #define __sferror(p) (((p)->_flags & __SERR) != 0)
>
> /*