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