120 lines
4.4 KiB
C
120 lines
4.4 KiB
C
#ifndef _STDIO_PRE_H_
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#define _STDIO_PRE_H_
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/*
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** Distributed under the terms of the OpenBeOS License.
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*/
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// Details of the BeOS compatible stdio implementation
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// Structure definitions
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// ToDo: this is a work in progress to make our stdio
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// BeOS' GNU/libio (almost) binary compatible
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// We are not yet compatible!
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// Currently only function names are compatible
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#ifndef _STDIO_H_
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# error "This file must be included from stdio.h!"
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#endif
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extern char *_single_threaded;
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/* This determines if a process runs single threaded or not */
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/* stdio buffers */
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struct __sbuf {
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unsigned char *_base;
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int _size;
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};
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/*
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* stdio state variables.
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*
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* The following always hold:
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*
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*if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
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* _lbfsize is -_bf._size, else _lbfsize is 0
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*if _flags&__SRD, _w is 0
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*if _flags&__SWR, _r is 0
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*
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* This ensures that the getc and putc macros (or inline functions) never
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* try to write or read from a file that is in `read' or `write' mode.
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* (Moreover, they can, and do, automatically switch from read mode to
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* write mode, and back, on "r+" and "w+" files.)
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*
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* _lbfsize is used only to make the inline line-buffered output stream
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* code as compact as possible.
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*
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* _ub, _up, and _ur are used when ungetc() pushes back more characters
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* than fit in the current _bf, or when ungetc() pushes back a character
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* that does not match the previous one in _bf. When this happens,
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* _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
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* _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
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*/
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typedef struct __FILE {
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// ToDo: these fields must be maintained (at the same position)!
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//int _flags; /* High-order word is _IO_MAGIC; rest is flags. */
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char *_IO_read_ptr; /* Current read pointer */
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char *_IO_read_end; /* End of get area. */
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//char *_IO_read_base; /* Start of putback+get area. */
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//char *_IO_write_base; /* Start of put area. */
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char *_IO_write_ptr; /* Current put pointer. */
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char *_IO_write_end; /* End of put area. */
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unsigned char *_p;/* current position in (some) buffer */
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int _r; /* read space left for getc() */
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int _w; /* write space left for putc() */
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short _flags; /* flags, below; this FILE is free if 0 */
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short _file; /* fileno, if Unix descriptor, else -1 */
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struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
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int _lbfsize;/* 0 or -_bf._size, for inline putc */
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/* operations */
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void *_cookie;/* cookie passed to io functions */
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int (*_close) (void *);
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int (*_read) (void *, char *, int);
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fpos_t (*_seek) (void *, fpos_t, int);
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int (*_write) (void *, const char *, int);
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/* separate buffer for long sequences of ungetc() */
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struct __sbuf _ub; /* ungetc buffer */
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unsigned char *_up; /* saved _p when _p is doing ungetc data */
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int _ur;/* saved _r when _r is counting ungetc data */
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/* tricks to meet minimum requirements even when malloc() fails */
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unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */
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unsigned char _nbuf[1]; /* guarantee a getc() buffer */
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/* separate buffer for fgetln() when line crosses buffer boundary */
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struct __sbuf _lb; /* buffer for fgetln() */
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/* Unix stdio files get aligned to block boundaries on fseek() */
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int _blksize;/* stat.st_blksize (may be != _bf._size) */
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fpos_t _offset;/* current lseek offset */
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// ToDo: add structure reserved fields
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} FILE;
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#define __SLBF 0x0001 /* line buffered */
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#define __SNBF 0x0002 /* unbuffered */
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#define __SRD 0x0004 /* OK to read */
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#define __SWR 0x0008 /* OK to write */
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/* RD and WR are never simultaneously asserted */
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#define __SRW 0x0010 /* open for reading & writing */
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#define __SEOF 0x0020 /* found EOF */
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#define __SERR 0x0040 /* found error */
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#define __SMBF 0x0080 /* _buf is from malloc */
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#define __SAPP 0x0100 /* fdopen()ed in append mode */
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#define __SSTR 0x0200 /* this is an sprintf/snprintf string */
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#define __SOPT 0x0400 /* do fseek() optimisation */
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#define __SNPT 0x0800 /* do not do fseek() optimisation */
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#define __SOFF 0x1000 /* set iff _offset is in fact correct */
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#define __SMOD 0x2000 /* true => fgetln modified _p text */
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#define __SALC 0x4000 /* allocate string space dynamically */
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#define __PRINTFLIKE(format, varargs) __attribute__ ((__format__ (__printf__, format, varargs)));
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#define __SCANFLIKE(format, varargs) __attribute__((__format__ (__scanf__, format, varargs)))
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#endif /* _STDIO_PRE_H_ */
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