root/include/bio.h

INCLUDED FROM

DEFINITIONS

1. AUTOLIB

/*
http://code.google.com/p/inferno-os/source/browse/include/bio.h

        Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
        Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com).  All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

#ifndef _BIO_H_
#define _BIO_H_ 1
#if defined(__cplusplus)
extern "C" {
#endif

#ifdef AUTOLIB
AUTOLIB(bio)
#endif

typedef struct  Biobuf  Biobuf;

enum
{
        Bsize           = 8*1024,
        Bungetsize      = 4,            /* space for ungetc */
        Bmagic          = 0x314159,
        Beof            = -1,
        Bbad            = -2,

        Binactive       = 0,            /* states */
        Bractive,
        Bwactive,
        Bracteof,

        Bend
};

struct  Biobuf
{
        int     icount;         /* neg num of bytes at eob */
        int     ocount;         /* num of bytes at bob */
        int     rdline;         /* num of bytes after rdline */
        int     runesize;       /* num of bytes of last getrune */
        int     state;          /* r/w/inactive */
        int     fid;            /* open file */
        int     flag;           /* magic if malloc'ed */
        vlong   offset;         /* offset of buffer in file */
        int     bsize;          /* size of buffer */
        unsigned char*  bbuf;           /* pointer to beginning of buffer */
        unsigned char*  ebuf;           /* pointer to end of buffer */
        unsigned char*  gbuf;           /* pointer to good data in buf */
        unsigned char   b[Bungetsize+Bsize];
};

/*
 * These macros get 1-, 2-, and 4-byte integer values by reading the
 * next few bytes in little-endian order.
 */
#define BGETC(bp)\
        ((bp)->icount?(int)((bp)->ebuf[(bp)->icount++]):Bgetc((bp)))
#define BGETLE2(bp)\
        ((bp)->icount<=-2?((bp)->icount+=2,((bp)->ebuf[(bp)->icount-2])|((bp)->ebuf[(bp)->icount-1]<<8)):Bgetle2((bp)))
#define BGETLE4(bp)\
        (int)((bp)->icount<=-4?((bp)->icount+=4,((bp)->ebuf[(bp)->icount-4])|((bp)->ebuf[(bp)->icount-3]<<8)|((bp)->ebuf[(bp)->icount-2]<<16)|((uint32)(bp)->ebuf[(bp)->icount-1]<<24)):Bgetle4((bp)))

/*
 * These macros put 1-, 2-, and 4-byte integer values by writing the
 * next few bytes in little-endian order.
 */
#define BPUTC(bp,c)\
        ((bp)->ocount?(bp)->ebuf[(bp)->ocount++]=(unsigned char)(c),0:Bputc((bp),(c)))
#define BPUTLE2(bp,c)\
        ((bp)->ocount<=-2?(bp)->ocount+=2,(bp)->ebuf[(bp)->ocount-2]=(unsigned char)(c),(bp)->ebuf[(bp)->ocount-1]=(unsigned char)(c>>8),0:Bputle2((bp),(c)))
#define BPUTLE4(bp,c)\
        ((bp)->ocount<=-4?(bp)->ocount+=4,(bp)->ebuf[(bp)->ocount-4]=(unsigned char)(c),(bp)->ebuf[(bp)->ocount-3]=(unsigned char)(c>>8),(bp)->ebuf[(bp)->ocount-2]=(unsigned char)(c>>16),(bp)->ebuf[(bp)->ocount-1]=(unsigned char)(c>>24),0:Bputle4((bp),(c)))

#define BOFFSET(bp)\
        (((bp)->state==Bractive)?\
                (bp)->offset + (bp)->icount:\
        (((bp)->state==Bwactive)?\
                (bp)->offset + ((bp)->bsize + (bp)->ocount):\
                -1))
#define BLINELEN(bp)\
        (bp)->rdline
#define BFILDES(bp)\
        (bp)->fid

int     Bbuffered(Biobuf*);
Biobuf* Bfdopen(int, int);
int     Bfildes(Biobuf*);
int     Bflush(Biobuf*);
int     Bgetc(Biobuf*);
int     Bgetle2(Biobuf*);
int     Bgetle4(Biobuf*);
int     Bgetd(Biobuf*, double*);
long    Bgetrune(Biobuf*);
int     Binit(Biobuf*, int, int);
int     Binits(Biobuf*, int, int, unsigned char*, int);
int     Blinelen(Biobuf*);
vlong   Boffset(Biobuf*);
Biobuf* Bopen(char*, int);
int     Bprint(Biobuf*, char*, ...);
int     Bputc(Biobuf*, int);
int     Bputle2(Biobuf*, int);
int     Bputle4(Biobuf*, int);
int     Bputrune(Biobuf*, long);
void*   Brdline(Biobuf*, int);
char*   Brdstr(Biobuf*, int, int);
long    Bread(Biobuf*, void*, long);
vlong   Bseek(Biobuf*, vlong, int);
int     Bterm(Biobuf*);
int     Bungetc(Biobuf*);
int     Bungetrune(Biobuf*);
long    Bwrite(Biobuf*, void*, long);
int     Bvprint(Biobuf*, char*, va_list);

#if defined(__cplusplus)
}
#endif
#endif