1 #ifndef _BIO_H_
2 #define _BIO_H_ 1
3 #if defined(__cplusplus)
4 extern "C" { 
5 #endif
6 
7 #ifdef AUTOLIB
8 AUTOLIB(bio)
9 #endif
10 
11 #include <fcntl.h>	/* for O_RDONLY, O_WRONLY */
12 
13 typedef	struct	Biobuf	Biobuf;
14 
15 enum
16 {
17 	Bsize		= 8*1024,
18 	Bungetsize	= 4,		/* space for ungetc */
19 	Bmagic		= 0x314159,
20 	Beof		= -1,
21 	Bbad		= -2,
22 
23 	Binactive	= 0,		/* states */
24 	Bractive,
25 	Bwactive,
26 	Bracteof,
27 
28 	Bend
29 };
30 
31 struct	Biobuf
32 {
33 	int	icount;		/* neg num of bytes at eob */
34 	int	ocount;		/* num of bytes at bob */
35 	int	rdline;		/* num of bytes after rdline */
36 	int	runesize;	/* num of bytes of last getrune */
37 	int	state;		/* r/w/inactive */
38 	int	fid;		/* open file */
39 	int	flag;		/* magic if malloc'ed */
40 	long long	offset;		/* offset of buffer in file */
41 	int	bsize;		/* size of buffer */
42 	unsigned char*	bbuf;		/* pointer to beginning of buffer */
43 	unsigned char*	ebuf;		/* pointer to end of buffer */
44 	unsigned char*	gbuf;		/* pointer to good data in buf */
45 	unsigned char	b[Bungetsize+Bsize];
46 };
47 
48 #define	BGETC(bp)\
49 	((bp)->icount?(bp)->bbuf[(bp)->bsize+(bp)->icount++]:Bgetc((bp)))
50 #define	BPUTC(bp,c)\
51 	((bp)->ocount?(bp)->bbuf[(bp)->bsize+(bp)->ocount++]=(c),0:Bputc((bp),(c)))
52 #define	BOFFSET(bp)\
53 	(((bp)->state==Bractive)?\
54 		(bp)->offset + (bp)->icount:\
55 	(((bp)->state==Bwactive)?\
56 		(bp)->offset + ((bp)->bsize + (bp)->ocount):\
57 		-1))
58 #define	BLINELEN(bp)\
59 	(bp)->rdline
60 #define	BFILDES(bp)\
61 	(bp)->fid
62 
63 int	Bbuffered(Biobuf*);
64 Biobuf*	Bfdopen(int, int);
65 int	Bfildes(Biobuf*);
66 int	Bflush(Biobuf*);
67 int	Bgetc(Biobuf*);
68 int	Bgetd(Biobuf*, double*);
69 long	Bgetrune(Biobuf*);
70 int	Binit(Biobuf*, int, int);
71 int	Binits(Biobuf*, int, int, unsigned char*, int);
72 int	Blinelen(Biobuf*);
73 long long	Boffset(Biobuf*);
74 Biobuf*	Bopen(char*, int);
75 int	Bprint(Biobuf*, char*, ...);
76 int	Bputc(Biobuf*, int);
77 int	Bputrune(Biobuf*, long);
78 void*	Brdline(Biobuf*, int);
79 char*	Brdstr(Biobuf*, int, int);
80 long	Bread(Biobuf*, void*, long);
81 long long	Bseek(Biobuf*, long long, int);
82 int	Bterm(Biobuf*);
83 int	Bungetc(Biobuf*);
84 int	Bungetrune(Biobuf*);
85 long	Bwrite(Biobuf*, void*, long);
86 int	Bvprint(Biobuf*, char*, va_list);
87 
88 #if defined(__cplusplus)
89 }
90 #endif
91 #endif