github.com/ccccaoqing/test@v0.0.0-20220510085219-3985d23445c0/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  typedef	struct	Biobuf	Biobuf;
    37  
    38  enum
    39  {
    40  	Bsize		= 8*1024,
    41  	Bungetsize	= 4,		/* space for ungetc */
    42  	Bmagic		= 0x314159,
    43  	Beof		= -1,
    44  	Bbad		= -2,
    45  
    46  	Binactive	= 0,		/* states */
    47  	Bractive,
    48  	Bwactive,
    49  	Bracteof,
    50  
    51  	Bend
    52  };
    53  
    54  struct	Biobuf
    55  {
    56  	int	icount;		/* neg num of bytes at eob */
    57  	int	ocount;		/* num of bytes at bob */
    58  	int	rdline;		/* num of bytes after rdline */
    59  	int	runesize;	/* num of bytes of last getrune */
    60  	int	state;		/* r/w/inactive */
    61  	int	fid;		/* open file */
    62  	int	flag;		/* magic if malloc'ed */
    63  	vlong	offset;		/* offset of buffer in file */
    64  	int	bsize;		/* size of buffer */
    65  	unsigned char*	bbuf;		/* pointer to beginning of buffer */
    66  	unsigned char*	ebuf;		/* pointer to end of buffer */
    67  	unsigned char*	gbuf;		/* pointer to good data in buf */
    68  	unsigned char	b[Bungetsize+Bsize];
    69  };
    70  
    71  /*
    72   * These macros get 1-, 2-, and 4-byte integer values by reading the
    73   * next few bytes in little-endian order.
    74   */
    75  #define	BGETC(bp)\
    76  	((bp)->icount?(int)((bp)->ebuf[(bp)->icount++]):Bgetc((bp)))
    77  #define	BGETLE2(bp)\
    78  	((bp)->icount<=-2?((bp)->icount+=2,((bp)->ebuf[(bp)->icount-2])|((bp)->ebuf[(bp)->icount-1]<<8)):Bgetle2((bp)))
    79  #define	BGETLE4(bp)\
    80  	(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)))
    81  
    82  /*
    83   * These macros put 1-, 2-, and 4-byte integer values by writing the
    84   * next few bytes in little-endian order.
    85   */
    86  #define	BPUTC(bp,c)\
    87  	((bp)->ocount?(bp)->ebuf[(bp)->ocount++]=(unsigned char)(c),0:Bputc((bp),(c)))
    88  #define	BPUTLE2(bp,c)\
    89  	((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)))
    90  #define	BPUTLE4(bp,c)\
    91  	((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)))
    92  
    93  #define	BOFFSET(bp)\
    94  	(((bp)->state==Bractive)?\
    95  		(bp)->offset + (bp)->icount:\
    96  	(((bp)->state==Bwactive)?\
    97  		(bp)->offset + ((bp)->bsize + (bp)->ocount):\
    98  		-1))
    99  #define	BLINELEN(bp)\
   100  	(bp)->rdline
   101  #define	BFILDES(bp)\
   102  	(bp)->fid
   103  
   104  int	Bbuffered(Biobuf*);
   105  Biobuf*	Bfdopen(int, int);
   106  int	Bfildes(Biobuf*);
   107  int	Bflush(Biobuf*);
   108  int	Bgetc(Biobuf*);
   109  int	Bgetle2(Biobuf*);
   110  int	Bgetle4(Biobuf*);
   111  int	Bgetd(Biobuf*, double*);
   112  long	Bgetrune(Biobuf*);
   113  int	Binit(Biobuf*, int, int);
   114  int	Binits(Biobuf*, int, int, unsigned char*, int);
   115  int	Blinelen(Biobuf*);
   116  vlong	Boffset(Biobuf*);
   117  Biobuf*	Bopen(char*, int);
   118  int	Bprint(Biobuf*, char*, ...);
   119  int	Bputc(Biobuf*, int);
   120  int	Bputle2(Biobuf*, int);
   121  int	Bputle4(Biobuf*, int);
   122  int	Bputrune(Biobuf*, long);
   123  void*	Brdline(Biobuf*, int);
   124  char*	Brdstr(Biobuf*, int, int);
   125  long	Bread(Biobuf*, void*, long);
   126  vlong	Bseek(Biobuf*, vlong, int);
   127  int	Bterm(Biobuf*);
   128  int	Bungetc(Biobuf*);
   129  int	Bungetrune(Biobuf*);
   130  long	Bwrite(Biobuf*, void*, long);
   131  int	Bvprint(Biobuf*, char*, va_list);
   132  /*c2go
   133  int	BGETC(Biobuf*);
   134  int	BGETLE2(Biobuf*);
   135  int	BGETLE4(Biobuf*);
   136  int	BPUTC(Biobuf*, int);
   137  int	BPUTLE2(Biobuf*, int);
   138  int	BPUTLE4(Biobuf*, int);
   139  */
   140  
   141  #if defined(__cplusplus)
   142  }
   143  #endif
   144  #endif