1 #ifndef _BIO_H_
2 #define _BIO_H_ 1
3 #if defined(__cplusplus)
4 extern "C" { 
5 #endif
6 
7 #include <sys/types.h>	/* for off_t */
8 #include <fcntl.h>	/* for O_RDONLY, O_WRONLY */
9 
10 typedef	struct	Biobuf	Biobuf;
11 
12 enum
13 {
14 	Bsize		= 8*1024,
15 	Bungetsize	= 4,		/* space for ungetc */
16 	Bmagic		= 0x314159,
17 	Beof		= -1,
18 	Bbad		= -2,
19 
20 	Binactive	= 0,		/* states */
21 	Bractive,
22 	Bwactive,
23 	Bracteof,
24 
25 	Bend
26 };
27 
28 struct	Biobuf
29 {
30 	int	icount;		/* neg num of bytes at eob */
31 	int	ocount;		/* num of bytes at bob */
32 	int	rdline;		/* num of bytes after rdline */
33 	int	runesize;		/* num of bytes of last getrune */
34 	int	state;		/* r/w/inactive */
35 	int	fid;		/* open file */
36 	int	flag;		/* magic if malloc'ed */
37 	off_t	offset;		/* offset of buffer in file */
38 	int	bsize;		/* size of buffer */
39 	unsigned char*	bbuf;		/* pointer to beginning of buffer */
40 	unsigned char*	ebuf;		/* pointer to end of buffer */
41 	unsigned char*	gbuf;		/* pointer to good data in buf */
42 	unsigned char	b[Bungetsize+Bsize];
43 };
44 
45 #define	BGETC(bp)\
46 	((bp)->icount?(bp)->bbuf[(bp)->bsize+(bp)->icount++]:Bgetc((bp)))
47 #define	BPUTC(bp,c)\
48 	((bp)->ocount?(bp)->bbuf[(bp)->bsize+(bp)->ocount++]=(c),0:Bputc((bp),(c)))
49 #define	BOFFSET(bp)\
50 	(((bp)->state==Bractive)?\
51 		(bp)->offset + (bp)->icount:\
52 	(((bp)->state==Bwactive)?\
53 		(bp)->offset + ((bp)->bsize + (bp)->ocount):\
54 		-1))
55 #define	BLINELEN(bp)\
56 	(bp)->rdline
57 #define	BFILDES(bp)\
58 	(bp)->fid
59 
60 int	Bbuffered(Biobuf*);
61 Biobuf*	Bfdopen(int, int);
62 int	Bfildes(Biobuf*);
63 int	Bflush(Biobuf*);
64 int	Bgetc(Biobuf*);
65 int	Bgetd(Biobuf*, double*);
66 int	Binit(Biobuf*, int, int);
67 int	Binits(Biobuf*, int, int, unsigned char*, int);
68 int	Blinelen(Biobuf*);
69 off_t	Boffset(Biobuf*);
70 Biobuf*	Bopen(char*, int);
71 int	Bprint(Biobuf*, char*, ...);
72 int	Bputc(Biobuf*, int);
73 void*	Brdline(Biobuf*, int);
74 long	Bread(Biobuf*, void*, long);
75 off_t	Bseek(Biobuf*, off_t, int);
76 int	Bterm(Biobuf*);
77 int	Bungetc(Biobuf*);
78 int	Bungetrune(Biobuf*);
79 long	Bwrite(Biobuf*, void*, long);
80 char*	Brdstr(Biobuf*, int, int);
81 long	Bgetrune(Biobuf*);
82 int	Bputrune(Biobuf*, long);
83 
84 #if defined(__cplusplus)
85 }
86 #endif
87 #endif