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https://github.com/golang/go
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137 lines
4.3 KiB
C
137 lines
4.3 KiB
C
/*
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http://code.google.com/p/inferno-os/source/browse/include/bio.h
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Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
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Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). All rights reserved.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#ifndef _BIO_H_
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#define _BIO_H_ 1
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#if defined(__cplusplus)
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extern "C" {
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#endif
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#ifdef AUTOLIB
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AUTOLIB(bio)
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#endif
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typedef struct Biobuf Biobuf;
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enum
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{
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Bsize = 8*1024,
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Bungetsize = 4, /* space for ungetc */
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Bmagic = 0x314159,
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Beof = -1,
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Bbad = -2,
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Binactive = 0, /* states */
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Bractive,
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Bwactive,
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Bracteof,
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Bend
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};
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struct Biobuf
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{
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int icount; /* neg num of bytes at eob */
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int ocount; /* num of bytes at bob */
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int rdline; /* num of bytes after rdline */
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int runesize; /* num of bytes of last getrune */
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int state; /* r/w/inactive */
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int fid; /* open file */
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int flag; /* magic if malloc'ed */
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vlong offset; /* offset of buffer in file */
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int bsize; /* size of buffer */
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unsigned char* bbuf; /* pointer to beginning of buffer */
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unsigned char* ebuf; /* pointer to end of buffer */
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unsigned char* gbuf; /* pointer to good data in buf */
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unsigned char b[Bungetsize+Bsize];
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};
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/*
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* These macros get 1-, 2-, and 4-byte integer values by reading the
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* next few bytes in little-endian order.
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*/
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#define BGETC(bp)\
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((bp)->icount?(bp)->ebuf[(bp)->icount++]:Bgetc((bp)))
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#define BGETLE2(bp)\
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((bp)->icount<=-2?((bp)->icount+=2,((bp)->ebuf[(bp)->icount-2])|((bp)->ebuf[(bp)->icount-1]<<8)):Bgetle2((bp)))
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#define BGETLE4(bp)\
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(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)))
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/*
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* These macros put 1-, 2-, and 4-byte integer values by writing the
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* next few bytes in little-endian order.
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*/
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#define BPUTC(bp,c)\
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((bp)->ocount?(bp)->ebuf[(bp)->ocount++]=(unsigned char)(c),0:Bputc((bp),(c)))
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#define BPUTLE2(bp,c)\
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((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)))
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#define BPUTLE4(bp,c)\
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((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)))
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#define BOFFSET(bp)\
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(((bp)->state==Bractive)?\
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(bp)->offset + (bp)->icount:\
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(((bp)->state==Bwactive)?\
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(bp)->offset + ((bp)->bsize + (bp)->ocount):\
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-1))
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#define BLINELEN(bp)\
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(bp)->rdline
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#define BFILDES(bp)\
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(bp)->fid
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int Bbuffered(Biobuf*);
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Biobuf* Bfdopen(int, int);
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int Bfildes(Biobuf*);
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int Bflush(Biobuf*);
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int Bgetc(Biobuf*);
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int Bgetle2(Biobuf*);
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int Bgetle4(Biobuf*);
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int Bgetd(Biobuf*, double*);
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long Bgetrune(Biobuf*);
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int Binit(Biobuf*, int, int);
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int Binits(Biobuf*, int, int, unsigned char*, int);
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int Blinelen(Biobuf*);
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vlong Boffset(Biobuf*);
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Biobuf* Bopen(char*, int);
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int Bprint(Biobuf*, char*, ...);
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int Bputc(Biobuf*, int);
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int Bputle2(Biobuf*, int);
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int Bputle4(Biobuf*, int);
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int Bputrune(Biobuf*, long);
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void* Brdline(Biobuf*, int);
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char* Brdstr(Biobuf*, int, int);
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long Bread(Biobuf*, void*, long);
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vlong Bseek(Biobuf*, vlong, int);
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int Bterm(Biobuf*);
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int Bungetc(Biobuf*);
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int Bungetrune(Biobuf*);
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long Bwrite(Biobuf*, void*, long);
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int Bvprint(Biobuf*, char*, va_list);
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#if defined(__cplusplus)
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}
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#endif
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#endif
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