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