67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*
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* @(#)ndbm.h 5.1.1 (2.11BSD GTE) 12/31/93
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*/
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/*
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* Hashed key data base library.
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*/
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#define PBLKSIZ 1024
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#ifdef pdp11
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#define DBLKSIZ 512
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#else
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#define DBLKSIZ 4096
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#endif
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typedef struct {
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int dbm_dirf; /* open directory file */
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int dbm_pagf; /* open page file */
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int dbm_flags; /* flags, see below */
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long dbm_maxbno; /* last ``bit'' in dir file */
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long dbm_bitno; /* current bit number */
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long dbm_hmask; /* hash mask */
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long dbm_blkptr; /* current block for dbm_nextkey */
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int dbm_keyptr; /* current key for dbm_nextkey */
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long dbm_blkno; /* current page to read/write */
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long dbm_pagbno; /* current page in pagbuf */
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char dbm_pagbuf[PBLKSIZ]; /* page file block buffer */
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long dbm_dirbno; /* current block in dirbuf */
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char dbm_dirbuf[DBLKSIZ]; /* directory file block buffer */
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} DBM;
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#define _DBM_RDONLY 0x1 /* data base open read-only */
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#define _DBM_IOERR 0x2 /* data base I/O error */
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#define dbm_rdonly(db) ((db)->dbm_flags & _DBM_RDONLY)
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#define dbm_error(db) ((db)->dbm_flags & _DBM_IOERR)
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/* use this one at your own risk! */
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#define dbm_clearerr(db) ((db)->dbm_flags &= ~_DBM_IOERR)
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/* for flock(2) and fstat(2) */
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#define dbm_dirfno(db) ((db)->dbm_dirf)
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#define dbm_pagfno(db) ((db)->dbm_pagf)
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typedef struct {
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char *dptr;
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int dsize;
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} datum;
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/*
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* flags to dbm_store()
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*/
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#define DBM_INSERT 0
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#define DBM_REPLACE 1
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DBM *dbm_open();
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void dbm_close();
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datum dbm_fetch();
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datum dbm_firstkey();
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datum dbm_nextkey();
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long dbm_forder();
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int dbm_delete();
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int dbm_store();
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