[92e539] | 1 | /**************************************** |
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| 2 | * Computer Algebra System SINGULAR * |
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| 3 | ****************************************/ |
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| 4 | |
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| 5 | //**************************************************************************/ |
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| 6 | // |
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[06082a] | 7 | // $Id: ndbm.cc,v 1.14 2000-11-22 16:38:54 Singular Exp $ |
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[92e539] | 8 | // |
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| 9 | //**************************************************************************/ |
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| 10 | // 'ndbm.cc' containes all low-level functions to manipulate dbm-files |
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| 11 | // for the original Copyright of this file and 'ndbm.h' see below . |
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| 12 | // |
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| 13 | // some minor change where needed to compile and run under MacOS/MPW |
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| 14 | // |
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| 15 | //**************************************************************************/ |
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| 16 | |
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| 17 | #include "mod2.h" |
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| 18 | #ifdef HAVE_DBM |
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[06082a] | 19 | #ifndef HPUX_9 |
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| 20 | #include <strings.h> |
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| 21 | #endif |
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[92e539] | 22 | /* |
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| 23 | * Copyright (c) 1983 Regents of the University of California. |
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| 24 | * All rights reserved. The Berkeley software License Agreement |
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| 25 | * specifies the terms and conditions for redistribution. |
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| 26 | */ |
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| 27 | |
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| 28 | #if defined(LIBC_SCCS) && !defined(lint) |
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[573ae7] | 29 | static char sccsid[] = "@(#)ndbm.c 5.3 (Berkeley) 3/9/86"; |
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[92e539] | 30 | #endif LIBC_SCCS and not lint |
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| 31 | |
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| 32 | //**************************************************************************/ |
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| 33 | |
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| 34 | #include <stdio.h> |
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[3ff334] | 35 | #ifdef __MWERKS__ |
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| 36 | # define bcopy(a,b,c) memmove(b,a,c) |
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| 37 | # define EPERM 1 |
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| 38 | # define ENOMEM 23 |
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| 39 | # define ENOSPC 28 |
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| 40 | # define L_SET SEEK_SET |
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[92e539] | 41 | #ifdef macintosh |
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| 42 | # include <stdlib.h> |
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| 43 | # include <errno.h> |
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| 44 | # include "fcntl.h" |
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| 45 | # include <string.h> |
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| 46 | # include <stat.h> |
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[3ff334] | 47 | //# include <stat.h> |
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| 48 | #else |
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| 49 | # include <unix.h> |
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| 50 | # include <ThreadLocalData.h> |
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| 51 | #endif |
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| 52 | #else |
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[92e539] | 53 | # include <sys/types.h> |
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| 54 | # include <sys/stat.h> |
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| 55 | # include <sys/file.h> |
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| 56 | # include <errno.h> |
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[1fc83c0] | 57 | # include <stdlib.h> |
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| 58 | # include <string.h> |
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| 59 | # include <unistd.h> |
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[dbf92f] | 60 | # include <fcntl.h> |
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[3ff334] | 61 | #endif |
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[2c3da6] | 62 | #ifndef HAVE_BCOPY |
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[954622] | 63 | # define bcopy(a,b,c) memmove(b,a,c) |
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[2c3da6] | 64 | #endif /* not HAVE_BCOPY */ |
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[92e539] | 65 | #include "ndbm.h" |
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| 66 | |
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| 67 | #define BYTESIZ 8 |
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| 68 | #undef setbit |
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| 69 | |
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| 70 | static void dbm_access(register DBM *db, long hash); |
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| 71 | static int getbit(register DBM *db); |
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| 72 | static void setbit(register DBM *db); |
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| 73 | static datum makdatum(char buf[PBLKSIZ], int n); |
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| 74 | static int finddatum(char buf[PBLKSIZ], datum item); |
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| 75 | static long hashinc(register DBM *db, long hash); |
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| 76 | static long dcalchash(datum item); |
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| 77 | static int delitem(char buf[PBLKSIZ], int n); |
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| 78 | static int additem(char buf[PBLKSIZ], datum item, datum item1); |
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[3ff334] | 79 | #if defined(__MWERKS__) && ! defined(macintosh) |
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| 80 | #define errno (_GetThreadLocalData()->errno) |
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| 81 | #else |
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[92e539] | 82 | extern int errno; |
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[3ff334] | 83 | #endif |
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[92e539] | 84 | |
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| 85 | DBM * |
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| 86 | dbm_open(char *file, int flags, int mode) |
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| 87 | { |
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| 88 | struct stat statb; |
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| 89 | register DBM *db; |
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| 90 | |
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| 91 | if ((db = (DBM *)malloc(sizeof *db)) == 0) { |
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| 92 | errno = ENOMEM; |
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| 93 | return ((DBM *)0); |
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| 94 | } |
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| 95 | #ifdef macintosh |
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| 96 | // It seems that the compile has some problems to commit the flags properly |
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| 97 | // O_RDWR | O_CREAT = 0x102 change to 0x200. We don't know why. |
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| 98 | // setting flags to O_RDWR | O_CREAT solved our problem. :-( |
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| 99 | flags = O_RDWR | O_CREAT; |
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| 100 | #endif /* macintosh */ |
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[74fced0] | 101 | #ifdef MSDOS |
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| 102 | // default mode of open is ascii, we need binary mode. |
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| 103 | flags |= O_BINARY; |
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| 104 | #endif |
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[92e539] | 105 | db->dbm_flags = (flags & 03) == O_RDONLY ? _DBM_RDONLY : 0; |
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| 106 | if ((flags & 03) == O_WRONLY) |
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| 107 | flags = (flags & ~03) | O_RDWR; |
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| 108 | strcpy(db->dbm_pagbuf, file); |
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| 109 | strcat(db->dbm_pagbuf, ".pag"); |
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[3ff334] | 110 | #ifdef __MWERKS__ |
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[92e539] | 111 | db->dbm_pagf = open(db->dbm_pagbuf, flags); |
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[3ff334] | 112 | #else /* not __MWERKS__ */ |
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[92e539] | 113 | db->dbm_pagf = open(db->dbm_pagbuf, flags, mode); |
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[3ff334] | 114 | #endif /* __MWERKS__ */ |
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[92e539] | 115 | if (db->dbm_pagf < 0) |
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| 116 | goto bad; |
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| 117 | strcpy(db->dbm_pagbuf, file); |
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| 118 | strcat(db->dbm_pagbuf, ".dir"); |
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[3ff334] | 119 | #ifdef __MWERKS__ |
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[92e539] | 120 | db->dbm_dirf = open(db->dbm_pagbuf, flags); |
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[3ff334] | 121 | #else /* not __MWERKS__ */ |
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[92e539] | 122 | db->dbm_dirf = open(db->dbm_pagbuf, flags, mode); |
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[3ff334] | 123 | #endif /* __MWERKS__ */ |
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[92e539] | 124 | if (db->dbm_dirf < 0) |
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| 125 | goto bad1; |
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| 126 | fstat(db->dbm_dirf, &statb); |
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| 127 | db->dbm_maxbno = statb.st_size*BYTESIZ-1; |
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| 128 | db->dbm_pagbno = db->dbm_dirbno = -1; |
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| 129 | return (db); |
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| 130 | bad1: |
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| 131 | (void) close(db->dbm_pagf); |
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| 132 | bad: |
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| 133 | free((char *)db); |
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| 134 | return ((DBM *)0); |
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| 135 | } |
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| 136 | |
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| 137 | void |
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| 138 | dbm_close(DBM *db) |
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| 139 | { |
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| 140 | (void) close(db->dbm_dirf); |
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| 141 | (void) close(db->dbm_pagf); |
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| 142 | free((char *)db); |
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| 143 | } |
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| 144 | |
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| 145 | long |
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| 146 | dbm_forder(register DBM *db, datum key) |
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| 147 | { |
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| 148 | long hash; |
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[e9ad8a6] | 149 | |
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[92e539] | 150 | hash = dcalchash(key); |
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| 151 | for (db->dbm_hmask=0;; db->dbm_hmask=(db->dbm_hmask<<1)+1) { |
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| 152 | db->dbm_blkno = hash & db->dbm_hmask; |
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| 153 | db->dbm_bitno = db->dbm_blkno + db->dbm_hmask; |
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| 154 | if (getbit(db) == 0) |
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| 155 | break; |
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| 156 | } |
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| 157 | return (db->dbm_blkno); |
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| 158 | } |
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| 159 | |
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| 160 | datum |
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| 161 | dbm_fetch(register DBM *db, datum key) |
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| 162 | { |
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[cca96f] | 163 | register int i; |
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[92e539] | 164 | datum item; |
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| 165 | |
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| 166 | if (dbm_error(db)) |
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| 167 | goto err; |
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| 168 | dbm_access(db, dcalchash(key)); |
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| 169 | if ((i = finddatum(db->dbm_pagbuf, key)) >= 0) { |
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| 170 | item = makdatum(db->dbm_pagbuf, i+1); |
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| 171 | if (item.dptr != NULL) |
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| 172 | return (item); |
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| 173 | } |
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| 174 | err: |
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| 175 | item.dptr = NULL; |
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| 176 | item.dsize = 0; |
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| 177 | return (item); |
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| 178 | } |
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| 179 | |
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[1fc83c0] | 180 | int dbm_delete(register DBM *db, datum key) |
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[92e539] | 181 | { |
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[cca96f] | 182 | register int i; |
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[92e539] | 183 | datum item; |
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| 184 | |
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| 185 | if (dbm_error(db)) |
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| 186 | return (-1); |
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| 187 | if (dbm_rdonly(db)) { |
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| 188 | errno = EPERM; |
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| 189 | return (-1); |
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| 190 | } |
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| 191 | dbm_access(db, dcalchash(key)); |
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| 192 | if ((i = finddatum(db->dbm_pagbuf, key)) < 0) |
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| 193 | return (-1); |
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| 194 | if (!delitem(db->dbm_pagbuf, i)) |
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| 195 | goto err; |
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| 196 | db->dbm_pagbno = db->dbm_blkno; |
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| 197 | (void) lseek(db->dbm_pagf, db->dbm_blkno*PBLKSIZ, L_SET); |
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| 198 | if (write(db->dbm_pagf, db->dbm_pagbuf, PBLKSIZ) != PBLKSIZ) { |
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| 199 | err: |
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| 200 | db->dbm_flags |= _DBM_IOERR; |
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| 201 | return (-1); |
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| 202 | } |
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| 203 | return (0); |
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| 204 | } |
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| 205 | |
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[1fc83c0] | 206 | int dbm_store(register DBM *db, datum key, datum dat, int replace) |
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[92e539] | 207 | { |
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[cca96f] | 208 | register int i; |
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[92e539] | 209 | int ret; |
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| 210 | datum item, item1; |
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| 211 | char ovfbuf[PBLKSIZ]; |
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| 212 | |
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| 213 | if (dbm_error(db)) |
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| 214 | return (-1); |
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| 215 | if (dbm_rdonly(db)) { |
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| 216 | errno = EPERM; |
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| 217 | return (-1); |
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| 218 | } |
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| 219 | loop: |
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| 220 | dbm_access(db, dcalchash(key)); |
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| 221 | if ((i = finddatum(db->dbm_pagbuf, key)) >= 0) { |
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| 222 | if (!replace) |
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| 223 | return (1); |
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| 224 | if (!delitem(db->dbm_pagbuf, i)) { |
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| 225 | db->dbm_flags |= _DBM_IOERR; |
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| 226 | return (-1); |
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| 227 | } |
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| 228 | } |
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| 229 | if (!additem(db->dbm_pagbuf, key, dat)) |
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| 230 | goto split; |
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| 231 | db->dbm_pagbno = db->dbm_blkno; |
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| 232 | (void) lseek(db->dbm_pagf, db->dbm_blkno*PBLKSIZ, L_SET); |
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| 233 | if ( (ret=write(db->dbm_pagf, db->dbm_pagbuf, PBLKSIZ)) != PBLKSIZ) { |
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| 234 | db->dbm_flags |= _DBM_IOERR; |
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| 235 | return (-1); |
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| 236 | } |
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| 237 | return (0); |
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[e9ad8a6] | 238 | |
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[92e539] | 239 | split: |
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| 240 | if (key.dsize+dat.dsize+3*sizeof(short) >= PBLKSIZ) { |
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| 241 | db->dbm_flags |= _DBM_IOERR; |
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| 242 | errno = ENOSPC; |
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| 243 | return (-1); |
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| 244 | } |
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[2c3da6] | 245 | memset(ovfbuf, 0, PBLKSIZ); |
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[92e539] | 246 | for (i=0;;) { |
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| 247 | item = makdatum(db->dbm_pagbuf, i); |
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| 248 | if (item.dptr == NULL) |
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| 249 | break; |
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| 250 | if (dcalchash(item) & (db->dbm_hmask+1)) { |
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| 251 | item1 = makdatum(db->dbm_pagbuf, i+1); |
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| 252 | if (item1.dptr == NULL) { |
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[573ae7] | 253 | fprintf(stderr, "ndbm: split not paired\n"); |
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| 254 | db->dbm_flags |= _DBM_IOERR; |
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| 255 | break; |
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[92e539] | 256 | } |
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| 257 | if (!additem(ovfbuf, item, item1) || |
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[573ae7] | 258 | !delitem(db->dbm_pagbuf, i)) { |
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| 259 | db->dbm_flags |= _DBM_IOERR; |
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| 260 | return (-1); |
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[92e539] | 261 | } |
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| 262 | continue; |
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| 263 | } |
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| 264 | i += 2; |
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| 265 | } |
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| 266 | db->dbm_pagbno = db->dbm_blkno; |
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| 267 | (void) lseek(db->dbm_pagf, db->dbm_blkno*PBLKSIZ, L_SET); |
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| 268 | if (write(db->dbm_pagf, db->dbm_pagbuf, PBLKSIZ) != PBLKSIZ) { |
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| 269 | db->dbm_flags |= _DBM_IOERR; |
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| 270 | return (-1); |
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| 271 | } |
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| 272 | (void) lseek(db->dbm_pagf, (db->dbm_blkno+db->dbm_hmask+1)*PBLKSIZ, L_SET); |
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| 273 | if (write(db->dbm_pagf, ovfbuf, PBLKSIZ) != PBLKSIZ) { |
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| 274 | db->dbm_flags |= _DBM_IOERR; |
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| 275 | return (-1); |
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| 276 | } |
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| 277 | setbit(db); |
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| 278 | goto loop; |
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| 279 | } |
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| 280 | |
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| 281 | datum |
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| 282 | dbm_firstkey(DBM *db) |
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| 283 | { |
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[e9ad8a6] | 284 | |
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[92e539] | 285 | db->dbm_blkptr = 0L; |
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| 286 | db->dbm_keyptr = 0; |
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| 287 | return (dbm_nextkey(db)); |
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| 288 | } |
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| 289 | |
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| 290 | datum |
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| 291 | dbm_nextkey(register DBM *db) |
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| 292 | { |
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| 293 | struct stat statb; |
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| 294 | datum item; |
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[e9ad8a6] | 295 | |
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[92e539] | 296 | if (dbm_error(db) || fstat(db->dbm_pagf, &statb) < 0) |
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[573ae7] | 297 | goto err; |
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[92e539] | 298 | statb.st_size /= PBLKSIZ; |
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| 299 | for (;;) { |
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| 300 | if (db->dbm_blkptr != db->dbm_pagbno) { |
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| 301 | db->dbm_pagbno = db->dbm_blkptr; |
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| 302 | (void) lseek(db->dbm_pagf, db->dbm_blkptr*PBLKSIZ, L_SET); |
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| 303 | if (read(db->dbm_pagf, db->dbm_pagbuf, PBLKSIZ) != PBLKSIZ) |
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[2c3da6] | 304 | memset(db->dbm_pagbuf, 0, PBLKSIZ); |
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[92e539] | 305 | #ifdef DEBUG |
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| 306 | else if (chkblk(db->dbm_pagbuf) < 0) |
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[573ae7] | 307 | db->dbm_flags |= _DBM_IOERR; |
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[92e539] | 308 | #endif |
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| 309 | } |
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| 310 | if (((short *)db->dbm_pagbuf)[0] != 0) { |
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| 311 | item = makdatum(db->dbm_pagbuf, db->dbm_keyptr); |
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| 312 | if (item.dptr != NULL) { |
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[573ae7] | 313 | db->dbm_keyptr += 2; |
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| 314 | return (item); |
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[92e539] | 315 | } |
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| 316 | db->dbm_keyptr = 0; |
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| 317 | } |
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| 318 | if (++db->dbm_blkptr >= statb.st_size) |
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| 319 | break; |
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| 320 | } |
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| 321 | err: |
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| 322 | item.dptr = NULL; |
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| 323 | item.dsize = 0; |
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| 324 | return (item); |
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| 325 | } |
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| 326 | |
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| 327 | static void |
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| 328 | dbm_access(register DBM *db, long hash) |
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| 329 | { |
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| 330 | for (db->dbm_hmask=0;; db->dbm_hmask=(db->dbm_hmask<<1)+1) { |
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| 331 | db->dbm_blkno = hash & db->dbm_hmask; |
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| 332 | db->dbm_bitno = db->dbm_blkno + db->dbm_hmask; |
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| 333 | if (getbit(db) == 0) |
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| 334 | break; |
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| 335 | } |
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| 336 | if (db->dbm_blkno != db->dbm_pagbno) { |
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| 337 | db->dbm_pagbno = db->dbm_blkno; |
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| 338 | (void) lseek(db->dbm_pagf, db->dbm_blkno*PBLKSIZ, L_SET); |
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| 339 | if (read(db->dbm_pagf, db->dbm_pagbuf, PBLKSIZ) != PBLKSIZ) |
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[2c3da6] | 340 | memset(db->dbm_pagbuf, 0, PBLKSIZ); |
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[92e539] | 341 | #ifdef DEBUG |
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| 342 | else if (chkblk(db->dbm_pagbuf) < 0) |
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| 343 | db->dbm_flags |= _DBM_IOERR; |
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| 344 | #endif |
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| 345 | } |
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| 346 | } |
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| 347 | |
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| 348 | static |
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[1fc83c0] | 349 | int getbit(register DBM *db) |
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[92e539] | 350 | { |
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| 351 | long bn; |
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[cca96f] | 352 | register int b, i, n; |
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[e9ad8a6] | 353 | |
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[92e539] | 354 | |
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| 355 | if (db->dbm_bitno > db->dbm_maxbno) |
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| 356 | return (0); |
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| 357 | n = db->dbm_bitno % BYTESIZ; |
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| 358 | bn = db->dbm_bitno / BYTESIZ; |
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| 359 | i = bn % DBLKSIZ; |
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| 360 | b = bn / DBLKSIZ; |
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| 361 | if (b != db->dbm_dirbno) { |
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| 362 | db->dbm_dirbno = b; |
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| 363 | (void) lseek(db->dbm_dirf, (long)b*DBLKSIZ, L_SET); |
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| 364 | if (read(db->dbm_dirf, db->dbm_dirbuf, DBLKSIZ) != DBLKSIZ) |
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[2c3da6] | 365 | memset(db->dbm_dirbuf, 0, DBLKSIZ); |
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[92e539] | 366 | } |
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| 367 | return (db->dbm_dirbuf[i] & (1<<n)); |
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| 368 | } |
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| 369 | |
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| 370 | static void |
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| 371 | setbit(register DBM *db) |
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| 372 | { |
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| 373 | long bn; |
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[cca96f] | 374 | register int i, n, b; |
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[92e539] | 375 | |
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| 376 | if (db->dbm_bitno > db->dbm_maxbno) |
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| 377 | db->dbm_maxbno = db->dbm_bitno; |
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| 378 | n = db->dbm_bitno % BYTESIZ; |
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| 379 | bn = db->dbm_bitno / BYTESIZ; |
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| 380 | i = bn % DBLKSIZ; |
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| 381 | b = bn / DBLKSIZ; |
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| 382 | if (b != db->dbm_dirbno) { |
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| 383 | db->dbm_dirbno = b; |
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| 384 | (void) lseek(db->dbm_dirf, (long)b*DBLKSIZ, L_SET); |
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| 385 | if (read(db->dbm_dirf, db->dbm_dirbuf, DBLKSIZ) != DBLKSIZ) |
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[2c3da6] | 386 | memset(db->dbm_dirbuf, 0, DBLKSIZ); |
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[92e539] | 387 | } |
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| 388 | db->dbm_dirbuf[i] |= 1<<n; |
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| 389 | db->dbm_dirbno = b; |
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| 390 | (void) lseek(db->dbm_dirf, (long)b*DBLKSIZ, L_SET); |
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| 391 | if (write(db->dbm_dirf, db->dbm_dirbuf, DBLKSIZ) != DBLKSIZ) |
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| 392 | db->dbm_flags |= _DBM_IOERR; |
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| 393 | } |
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| 394 | |
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| 395 | static datum |
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| 396 | makdatum(char buf[PBLKSIZ], int n) |
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| 397 | { |
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| 398 | register short *sp; |
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[cca96f] | 399 | register int t; |
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[92e539] | 400 | datum item; |
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| 401 | |
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| 402 | sp = (short *)buf; |
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[e9ad8a6] | 403 | if ((unsigned)n >= (unsigned)sp[0]) |
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| 404 | { |
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[92e539] | 405 | item.dptr = NULL; |
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| 406 | item.dsize = 0; |
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| 407 | return (item); |
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| 408 | } |
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| 409 | t = PBLKSIZ; |
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| 410 | if (n > 0) |
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| 411 | t = sp[n]; |
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| 412 | item.dptr = buf+sp[n+1]; |
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| 413 | item.dsize = t - sp[n+1]; |
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| 414 | return (item); |
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| 415 | } |
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| 416 | |
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| 417 | static |
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[1fc83c0] | 418 | int finddatum(char buf[PBLKSIZ], datum item) |
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[92e539] | 419 | { |
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| 420 | register short *sp; |
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| 421 | register int i, n, j; |
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| 422 | |
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| 423 | sp = (short *)buf; |
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| 424 | n = PBLKSIZ; |
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| 425 | for (i=0, j=sp[0]; i<j; i+=2, n = sp[i]) { |
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| 426 | n -= sp[i+1]; |
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| 427 | if (n != item.dsize) |
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| 428 | continue; |
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[2c3da6] | 429 | if (n == 0 || memcmp(&buf[sp[i+1]], item.dptr, n) == 0) |
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[92e539] | 430 | return (i); |
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| 431 | } |
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| 432 | return (-1); |
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| 433 | } |
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| 434 | |
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| 435 | static int hitab[16] |
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| 436 | /* ken's |
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| 437 | { |
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| 438 | 055,043,036,054,063,014,004,005, |
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[573ae7] | 439 | 010,064,077,000,035,027,025,071, |
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[92e539] | 440 | }; |
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| 441 | */ |
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| 442 | = { 61, 57, 53, 49, 45, 41, 37, 33, |
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[573ae7] | 443 | 29, 25, 21, 17, 13, 9, 5, 1, |
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[92e539] | 444 | }; |
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| 445 | static long hltab[64] |
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| 446 | = { |
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[573ae7] | 447 | 06100151277L,06106161736L,06452611562L,05001724107L, |
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| 448 | 02614772546L,04120731531L,04665262210L,07347467531L, |
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| 449 | 06735253126L,06042345173L,03072226605L,01464164730L, |
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| 450 | 03247435524L,07652510057L,01546775256L,05714532133L, |
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| 451 | 06173260402L,07517101630L,02431460343L,01743245566L, |
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| 452 | 00261675137L,02433103631L,03421772437L,04447707466L, |
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| 453 | 04435620103L,03757017115L,03641531772L,06767633246L, |
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| 454 | 02673230344L,00260612216L,04133454451L,00615531516L, |
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| 455 | 06137717526L,02574116560L,02304023373L,07061702261L, |
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| 456 | 05153031405L,05322056705L,07401116734L,06552375715L, |
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| 457 | 06165233473L,05311063631L,01212221723L,01052267235L, |
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| 458 | 06000615237L,01075222665L,06330216006L,04402355630L, |
---|
| 459 | 01451177262L,02000133436L,06025467062L,07121076461L, |
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| 460 | 03123433522L,01010635225L,01716177066L,05161746527L, |
---|
| 461 | 01736635071L,06243505026L,03637211610L,01756474365L, |
---|
| 462 | 04723077174L,03642763134L,05750130273L,03655541561L, |
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[92e539] | 463 | }; |
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| 464 | |
---|
| 465 | static long |
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| 466 | hashinc(register DBM *db, long hash) |
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| 467 | { |
---|
| 468 | long bit; |
---|
| 469 | |
---|
| 470 | hash &= db->dbm_hmask; |
---|
| 471 | bit = db->dbm_hmask+1; |
---|
| 472 | for (;;) { |
---|
| 473 | bit >>= 1; |
---|
| 474 | if (bit == 0) |
---|
| 475 | return (0L); |
---|
| 476 | if ((hash & bit) == 0) |
---|
| 477 | return (hash | bit); |
---|
| 478 | hash &= ~bit; |
---|
| 479 | } |
---|
| 480 | } |
---|
| 481 | |
---|
| 482 | static long |
---|
| 483 | dcalchash(datum item) |
---|
| 484 | { |
---|
| 485 | register int s, c, j; |
---|
| 486 | register char *cp; |
---|
| 487 | register long hashl; |
---|
| 488 | register int hashi; |
---|
[e9ad8a6] | 489 | |
---|
[92e539] | 490 | hashl = 0; |
---|
| 491 | hashi = 0; |
---|
| 492 | for (cp = item.dptr, s=item.dsize; --s >= 0; ) { |
---|
| 493 | c = *cp++; |
---|
| 494 | for (j=0; j<BYTESIZ; j+=4) { |
---|
| 495 | hashi += hitab[c&017]; |
---|
| 496 | hashl += hltab[hashi&63]; |
---|
| 497 | c >>= 4; |
---|
| 498 | } |
---|
| 499 | } |
---|
| 500 | return (hashl); |
---|
| 501 | } |
---|
| 502 | |
---|
| 503 | /* |
---|
| 504 | * Delete pairs of items (n & n+1). |
---|
| 505 | */ |
---|
| 506 | static |
---|
[1fc83c0] | 507 | int delitem(char buf[PBLKSIZ], int n) |
---|
[92e539] | 508 | { |
---|
| 509 | register short *sp, *sp1; |
---|
[e9ad8a6] | 510 | register int i1, i2; |
---|
[92e539] | 511 | |
---|
| 512 | sp = (short *)buf; |
---|
| 513 | i2 = sp[0]; |
---|
[e9ad8a6] | 514 | if ((unsigned)n >= (unsigned)i2 || (n & 1)) |
---|
[92e539] | 515 | return (0); |
---|
[e9ad8a6] | 516 | if (n == i2-2) |
---|
| 517 | { |
---|
[92e539] | 518 | sp[0] -= 2; |
---|
| 519 | return (1); |
---|
| 520 | } |
---|
| 521 | i1 = PBLKSIZ; |
---|
| 522 | if (n > 0) |
---|
| 523 | i1 = sp[n]; |
---|
| 524 | i1 -= sp[n+2]; |
---|
| 525 | if (i1 > 0) { |
---|
| 526 | i2 = sp[i2]; |
---|
| 527 | bcopy(&buf[i2], &buf[i2 + i1], sp[n+2] - i2); |
---|
| 528 | } |
---|
| 529 | sp[0] -= 2; |
---|
| 530 | for (sp1 = sp + sp[0], sp += n+1; sp <= sp1; sp++) |
---|
| 531 | sp[0] = sp[2] + i1; |
---|
| 532 | return (1); |
---|
| 533 | } |
---|
| 534 | |
---|
| 535 | /* |
---|
| 536 | * Add pairs of items (item & item1). |
---|
| 537 | */ |
---|
| 538 | static |
---|
[1fc83c0] | 539 | int additem(char buf[PBLKSIZ], datum item, datum item1) |
---|
[92e539] | 540 | { |
---|
| 541 | register short *sp; |
---|
[cca96f] | 542 | register int i1, i2, tmp; |
---|
[92e539] | 543 | |
---|
| 544 | sp = (short *)buf; |
---|
| 545 | i1 = PBLKSIZ; |
---|
| 546 | i2 = sp[0]; |
---|
| 547 | if (i2 > 0) |
---|
| 548 | i1 = sp[i2]; |
---|
| 549 | i1 -= item.dsize + item1.dsize; |
---|
[2c3da6] | 550 | tmp = (i2+3) * sizeof(short); |
---|
| 551 | if (i1 <= tmp) return (0); |
---|
[92e539] | 552 | sp[0] += 2; |
---|
| 553 | sp[++i2] = i1 + item1.dsize; |
---|
| 554 | bcopy(item.dptr, &buf[i1 + item1.dsize], item.dsize); |
---|
| 555 | sp[++i2] = i1; |
---|
| 556 | bcopy(item1.dptr, &buf[i1], item1.dsize); |
---|
| 557 | return (1); |
---|
| 558 | } |
---|
| 559 | |
---|
| 560 | #ifdef DEBUG |
---|
| 561 | static |
---|
| 562 | chkblk(char buf[PBLKSIZ]) |
---|
| 563 | { |
---|
| 564 | register short *sp; |
---|
| 565 | register t, i; |
---|
| 566 | |
---|
| 567 | sp = (short *)buf; |
---|
| 568 | t = PBLKSIZ; |
---|
| 569 | for (i=0; i<sp[0]; i++) { |
---|
| 570 | if (sp[i+1] > t) |
---|
| 571 | return (-1); |
---|
| 572 | t = sp[i+1]; |
---|
| 573 | } |
---|
| 574 | if (t < (sp[0]+1)*sizeof(short)) |
---|
| 575 | return (-1); |
---|
| 576 | return (0); |
---|
| 577 | } |
---|
| 578 | #endif |
---|
| 579 | |
---|
| 580 | #endif /* HAVE_DBM */ |
---|