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	bio.h - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	bio.h (2124B)
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	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 f…
	41 int bsize; /* size of buffer */
	42 unsigned char* bbuf; /* pointer to beginni…
	43 unsigned char* ebuf; /* pointer to end of …
	44 unsigned char* gbuf; /* pointer to good da…
	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…
	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