github.com/varialus/godfly@v0.0.0-20130904042352-1934f9f095ab/include/bio.h (about)

     1  /*
     2  http://code.google.com/p/inferno-os/source/browse/include/bio.h
     3  
     4  	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
     5  	Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com).  All rights reserved.
     6  
     7  Permission is hereby granted, free of charge, to any person obtaining a copy
     8  of this software and associated documentation files (the "Software"), to deal
     9  in the Software without restriction, including without limitation the rights
    10  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    11  copies of the Software, and to permit persons to whom the Software is
    12  furnished to do so, subject to the following conditions:
    13  
    14  The above copyright notice and this permission notice shall be included in
    15  all copies or substantial portions of the Software.
    16  
    17  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    18  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    19  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
    20  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    21  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    22  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    23  THE SOFTWARE.
    24  */
    25  
    26  #ifndef _BIO_H_
    27  #define _BIO_H_ 1
    28  #if defined(__cplusplus)
    29  extern "C" {
    30  #endif
    31  
    32  #ifdef AUTOLIB
    33  AUTOLIB(bio)
    34  #endif
    35  
    36  #include <fcntl.h>	/* for O_RDONLY, O_WRONLY */
    37  
    38  typedef	struct	Biobuf	Biobuf;
    39  
    40  enum
    41  {
    42  	Bsize		= 8*1024,
    43  	Bungetsize	= 4,		/* space for ungetc */
    44  	Bmagic		= 0x314159,
    45  	Beof		= -1,
    46  	Bbad		= -2,
    47  
    48  	Binactive	= 0,		/* states */
    49  	Bractive,
    50  	Bwactive,
    51  	Bracteof,
    52  
    53  	Bend
    54  };
    55  
    56  struct	Biobuf
    57  {
    58  	int	icount;		/* neg num of bytes at eob */
    59  	int	ocount;		/* num of bytes at bob */
    60  	int	rdline;		/* num of bytes after rdline */
    61  	int	runesize;	/* num of bytes of last getrune */
    62  	int	state;		/* r/w/inactive */
    63  	int	fid;		/* open file */
    64  	int	flag;		/* magic if malloc'ed */
    65  	vlong	offset;		/* offset of buffer in file */
    66  	int	bsize;		/* size of buffer */
    67  	unsigned char*	bbuf;		/* pointer to beginning of buffer */
    68  	unsigned char*	ebuf;		/* pointer to end of buffer */
    69  	unsigned char*	gbuf;		/* pointer to good data in buf */
    70  	unsigned char	b[Bungetsize+Bsize];
    71  };
    72  
    73  /*
    74   * These macros get 1-, 2-, and 4-byte integer values by reading the
    75   * next few bytes in little-endian order.
    76   */
    77  #define	BGETC(bp)\
    78  	((bp)->icount?(bp)->ebuf[(bp)->icount++]:Bgetc((bp)))
    79  #define	BGETLE2(bp)\
    80  	((bp)->icount<=-2?((bp)->icount+=2,((bp)->ebuf[(bp)->icount-2])|((bp)->ebuf[(bp)->icount-1]<<8)):Bgetle2((bp)))
    81  #define	BGETLE4(bp)\
    82  	((bp)->icount<=-4?((bp)->icount+=4,((bp)->ebuf[(bp)->icount-4])|((bp)->ebuf[(bp)->icount-3]<<8)|((bp)->ebuf[(bp)->icount-2]<<16)|((bp)->ebuf[(bp)->icount-1]<<24)):Bgetle4((bp)))
    83  
    84  /*
    85   * These macros put 1-, 2-, and 4-byte integer values by writing the
    86   * next few bytes in little-endian order.
    87   */
    88  #define	BPUTC(bp,c)\
    89  	((bp)->ocount?(bp)->ebuf[(bp)->ocount++]=(unsigned char)(c),0:Bputc((bp),(c)))
    90  #define	BPUTLE2(bp,c)\
    91  	((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)))
    92  #define	BPUTLE4(bp,c)\
    93  	((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)))
    94  
    95  #define	BOFFSET(bp)\
    96  	(((bp)->state==Bractive)?\
    97  		(bp)->offset + (bp)->icount:\
    98  	(((bp)->state==Bwactive)?\
    99  		(bp)->offset + ((bp)->bsize + (bp)->ocount):\
   100  		-1))
   101  #define	BLINELEN(bp)\
   102  	(bp)->rdline
   103  #define	BFILDES(bp)\
   104  	(bp)->fid
   105  
   106  int	Bbuffered(Biobuf*);
   107  Biobuf*	Bfdopen(int, int);
   108  int	Bfildes(Biobuf*);
   109  int	Bflush(Biobuf*);
   110  int	Bgetc(Biobuf*);
   111  int	Bgetle2(Biobuf*);
   112  int	Bgetle4(Biobuf*);
   113  int	Bgetd(Biobuf*, double*);
   114  long	Bgetrune(Biobuf*);
   115  int	Binit(Biobuf*, int, int);
   116  int	Binits(Biobuf*, int, int, unsigned char*, int);
   117  int	Blinelen(Biobuf*);
   118  vlong	Boffset(Biobuf*);
   119  Biobuf*	Bopen(char*, int);
   120  int	Bprint(Biobuf*, char*, ...);
   121  int	Bputc(Biobuf*, int);
   122  int	Bputle2(Biobuf*, int);
   123  int	Bputle4(Biobuf*, int);
   124  int	Bputrune(Biobuf*, long);
   125  void*	Brdline(Biobuf*, int);
   126  char*	Brdstr(Biobuf*, int, int);
   127  long	Bread(Biobuf*, void*, long);
   128  vlong	Bseek(Biobuf*, vlong, int);
   129  int	Bterm(Biobuf*);
   130  int	Bungetc(Biobuf*);
   131  int	Bungetrune(Biobuf*);
   132  long	Bwrite(Biobuf*, void*, long);
   133  int	Bvprint(Biobuf*, char*, va_list);
   134  
   135  #if defined(__cplusplus)
   136  }
   137  #endif
   138  #endif