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