[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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[341696] | 7 | // $Id$ |
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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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[b1dfaf] | 17 | #include <kernel/mod2.h> |
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[92e539] | 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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[f71e8f1] | 26 | * for details see ndbm.h |
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[92e539] | 27 | */ |
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| 28 | |
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| 29 | #if defined(LIBC_SCCS) && !defined(lint) |
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[573ae7] | 30 | static char sccsid[] = "@(#)ndbm.c 5.3 (Berkeley) 3/9/86"; |
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[046f44] | 31 | #endif |
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[92e539] | 32 | |
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| 33 | //**************************************************************************/ |
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| 34 | |
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| 35 | #include <stdio.h> |
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[48ce9a] | 36 | /* alternative: |
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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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| 41 | */ |
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| 42 | #include <sys/types.h> |
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| 43 | #include <sys/stat.h> |
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| 44 | #include <sys/file.h> |
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| 45 | #include <errno.h> |
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| 46 | #include <stdlib.h> |
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| 47 | #include <string.h> |
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| 48 | #include <unistd.h> |
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| 49 | #include <fcntl.h> |
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[2c3da6] | 50 | #ifndef HAVE_BCOPY |
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[954622] | 51 | # define bcopy(a,b,c) memmove(b,a,c) |
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[2c3da6] | 52 | #endif /* not HAVE_BCOPY */ |
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[599326] | 53 | #include <Singular/ndbm.h> |
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[92e539] | 54 | |
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| 55 | #define BYTESIZ 8 |
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| 56 | #undef setbit |
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| 57 | |
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| 58 | static void dbm_access(register DBM *db, long hash); |
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| 59 | static int getbit(register DBM *db); |
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| 60 | static void setbit(register DBM *db); |
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| 61 | static datum makdatum(char buf[PBLKSIZ], int n); |
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| 62 | static int finddatum(char buf[PBLKSIZ], datum item); |
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| 63 | static long hashinc(register DBM *db, long hash); |
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| 64 | static long dcalchash(datum item); |
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| 65 | static int delitem(char buf[PBLKSIZ], int n); |
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| 66 | static int additem(char buf[PBLKSIZ], datum item, datum item1); |
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| 67 | extern int errno; |
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[83b11eb] | 68 | extern "C" int singular_fstat(int fd, struct stat *buf); |
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[92e539] | 69 | |
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[3dd3ff] | 70 | DBM * dbm_open(char *file, int flags, int mode) |
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[92e539] | 71 | { |
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| 72 | struct stat statb; |
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| 73 | register DBM *db; |
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| 74 | |
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[3dd3ff] | 75 | if ((db = (DBM *)malloc(sizeof *db)) == 0) |
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| 76 | { |
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[92e539] | 77 | errno = ENOMEM; |
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| 78 | return ((DBM *)0); |
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| 79 | } |
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[74fced0] | 80 | #ifdef MSDOS |
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| 81 | // default mode of open is ascii, we need binary mode. |
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| 82 | flags |= O_BINARY; |
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| 83 | #endif |
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[92e539] | 84 | db->dbm_flags = (flags & 03) == O_RDONLY ? _DBM_RDONLY : 0; |
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| 85 | if ((flags & 03) == O_WRONLY) |
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| 86 | flags = (flags & ~03) | O_RDWR; |
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| 87 | strcpy(db->dbm_pagbuf, file); |
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| 88 | strcat(db->dbm_pagbuf, ".pag"); |
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| 89 | db->dbm_pagf = open(db->dbm_pagbuf, flags, mode); |
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| 90 | if (db->dbm_pagf < 0) |
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| 91 | goto bad; |
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| 92 | strcpy(db->dbm_pagbuf, file); |
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| 93 | strcat(db->dbm_pagbuf, ".dir"); |
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| 94 | db->dbm_dirf = open(db->dbm_pagbuf, flags, mode); |
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| 95 | if (db->dbm_dirf < 0) |
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| 96 | goto bad1; |
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[f6a162] | 97 | singular_fstat(db->dbm_dirf, &statb); |
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[92e539] | 98 | db->dbm_maxbno = statb.st_size*BYTESIZ-1; |
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| 99 | db->dbm_pagbno = db->dbm_dirbno = -1; |
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| 100 | return (db); |
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| 101 | bad1: |
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| 102 | (void) close(db->dbm_pagf); |
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| 103 | bad: |
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| 104 | free((char *)db); |
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| 105 | return ((DBM *)0); |
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| 106 | } |
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| 107 | |
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[3dd3ff] | 108 | void dbm_close(DBM *db) |
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[92e539] | 109 | { |
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| 110 | (void) close(db->dbm_dirf); |
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| 111 | (void) close(db->dbm_pagf); |
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| 112 | free((char *)db); |
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| 113 | } |
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| 114 | |
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[3dd3ff] | 115 | long dbm_forder(register DBM *db, datum key) |
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[92e539] | 116 | { |
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| 117 | long hash; |
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[e9ad8a6] | 118 | |
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[92e539] | 119 | hash = dcalchash(key); |
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[3dd3ff] | 120 | for (db->dbm_hmask=0;; db->dbm_hmask=(db->dbm_hmask<<1)+1) |
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| 121 | { |
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[92e539] | 122 | db->dbm_blkno = hash & db->dbm_hmask; |
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| 123 | db->dbm_bitno = db->dbm_blkno + db->dbm_hmask; |
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| 124 | if (getbit(db) == 0) |
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| 125 | break; |
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| 126 | } |
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| 127 | return (db->dbm_blkno); |
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| 128 | } |
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| 129 | |
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[3dd3ff] | 130 | datum dbm_fetch(register DBM *db, datum key) |
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[92e539] | 131 | { |
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[cca96f] | 132 | register int i; |
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[92e539] | 133 | datum item; |
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| 134 | |
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| 135 | if (dbm_error(db)) |
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| 136 | goto err; |
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| 137 | dbm_access(db, dcalchash(key)); |
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[3dd3ff] | 138 | if ((i = finddatum(db->dbm_pagbuf, key)) >= 0) |
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| 139 | { |
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[92e539] | 140 | item = makdatum(db->dbm_pagbuf, i+1); |
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| 141 | if (item.dptr != NULL) |
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| 142 | return (item); |
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| 143 | } |
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| 144 | err: |
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| 145 | item.dptr = NULL; |
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| 146 | item.dsize = 0; |
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| 147 | return (item); |
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| 148 | } |
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| 149 | |
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[1fc83c0] | 150 | int dbm_delete(register DBM *db, datum key) |
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[92e539] | 151 | { |
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[cca96f] | 152 | register int i; |
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[92e539] | 153 | datum item; |
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| 154 | |
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| 155 | if (dbm_error(db)) |
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| 156 | return (-1); |
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[3dd3ff] | 157 | if (dbm_rdonly(db)) |
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| 158 | { |
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[92e539] | 159 | errno = EPERM; |
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| 160 | return (-1); |
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| 161 | } |
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| 162 | dbm_access(db, dcalchash(key)); |
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| 163 | if ((i = finddatum(db->dbm_pagbuf, key)) < 0) |
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| 164 | return (-1); |
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| 165 | if (!delitem(db->dbm_pagbuf, i)) |
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| 166 | goto err; |
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| 167 | db->dbm_pagbno = db->dbm_blkno; |
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| 168 | (void) lseek(db->dbm_pagf, db->dbm_blkno*PBLKSIZ, L_SET); |
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[3dd3ff] | 169 | if (write(db->dbm_pagf, db->dbm_pagbuf, PBLKSIZ) != PBLKSIZ) |
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| 170 | { |
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[92e539] | 171 | err: |
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| 172 | db->dbm_flags |= _DBM_IOERR; |
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| 173 | return (-1); |
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| 174 | } |
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| 175 | return (0); |
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| 176 | } |
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| 177 | |
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[1fc83c0] | 178 | int dbm_store(register DBM *db, datum key, datum dat, int replace) |
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[92e539] | 179 | { |
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[cca96f] | 180 | register int i; |
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[92e539] | 181 | int ret; |
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| 182 | datum item, item1; |
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| 183 | char ovfbuf[PBLKSIZ]; |
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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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[3dd3ff] | 187 | if (dbm_rdonly(db)) |
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| 188 | { |
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[92e539] | 189 | errno = EPERM; |
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| 190 | return (-1); |
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| 191 | } |
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| 192 | loop: |
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| 193 | dbm_access(db, dcalchash(key)); |
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[3dd3ff] | 194 | if ((i = finddatum(db->dbm_pagbuf, key)) >= 0) |
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| 195 | { |
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[92e539] | 196 | if (!replace) |
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| 197 | return (1); |
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[3dd3ff] | 198 | if (!delitem(db->dbm_pagbuf, i)) |
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| 199 | { |
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[92e539] | 200 | db->dbm_flags |= _DBM_IOERR; |
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| 201 | return (-1); |
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| 202 | } |
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| 203 | } |
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| 204 | if (!additem(db->dbm_pagbuf, key, dat)) |
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| 205 | goto split; |
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| 206 | db->dbm_pagbno = db->dbm_blkno; |
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| 207 | (void) lseek(db->dbm_pagf, db->dbm_blkno*PBLKSIZ, L_SET); |
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[3dd3ff] | 208 | if ( (ret=write(db->dbm_pagf, db->dbm_pagbuf, PBLKSIZ)) != PBLKSIZ) |
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| 209 | { |
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[92e539] | 210 | db->dbm_flags |= _DBM_IOERR; |
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| 211 | return (-1); |
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| 212 | } |
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| 213 | return (0); |
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[e9ad8a6] | 214 | |
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[92e539] | 215 | split: |
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[3dd3ff] | 216 | if (key.dsize+dat.dsize+3*sizeof(short) >= PBLKSIZ) |
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| 217 | { |
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[92e539] | 218 | db->dbm_flags |= _DBM_IOERR; |
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| 219 | errno = ENOSPC; |
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| 220 | return (-1); |
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| 221 | } |
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[2c3da6] | 222 | memset(ovfbuf, 0, PBLKSIZ); |
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[92e539] | 223 | for (i=0;;) { |
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| 224 | item = makdatum(db->dbm_pagbuf, i); |
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| 225 | if (item.dptr == NULL) |
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| 226 | break; |
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[3dd3ff] | 227 | if (dcalchash(item) & (db->dbm_hmask+1)) |
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| 228 | { |
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[92e539] | 229 | item1 = makdatum(db->dbm_pagbuf, i+1); |
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| 230 | if (item1.dptr == NULL) { |
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[573ae7] | 231 | fprintf(stderr, "ndbm: split not paired\n"); |
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| 232 | db->dbm_flags |= _DBM_IOERR; |
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| 233 | break; |
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[92e539] | 234 | } |
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| 235 | if (!additem(ovfbuf, item, item1) || |
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[3dd3ff] | 236 | !delitem(db->dbm_pagbuf, i)) |
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| 237 | { |
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[573ae7] | 238 | db->dbm_flags |= _DBM_IOERR; |
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| 239 | return (-1); |
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[92e539] | 240 | } |
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| 241 | continue; |
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| 242 | } |
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| 243 | i += 2; |
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| 244 | } |
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| 245 | db->dbm_pagbno = db->dbm_blkno; |
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| 246 | (void) lseek(db->dbm_pagf, db->dbm_blkno*PBLKSIZ, L_SET); |
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[3dd3ff] | 247 | if (write(db->dbm_pagf, db->dbm_pagbuf, PBLKSIZ) != PBLKSIZ) |
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| 248 | { |
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[92e539] | 249 | db->dbm_flags |= _DBM_IOERR; |
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| 250 | return (-1); |
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| 251 | } |
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| 252 | (void) lseek(db->dbm_pagf, (db->dbm_blkno+db->dbm_hmask+1)*PBLKSIZ, L_SET); |
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[3dd3ff] | 253 | if (write(db->dbm_pagf, ovfbuf, PBLKSIZ) != PBLKSIZ) |
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| 254 | { |
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[92e539] | 255 | db->dbm_flags |= _DBM_IOERR; |
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| 256 | return (-1); |
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| 257 | } |
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| 258 | setbit(db); |
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| 259 | goto loop; |
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| 260 | } |
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| 261 | |
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[3dd3ff] | 262 | datum dbm_firstkey(DBM *db) |
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[92e539] | 263 | { |
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[e9ad8a6] | 264 | |
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[92e539] | 265 | db->dbm_blkptr = 0L; |
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| 266 | db->dbm_keyptr = 0; |
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| 267 | return (dbm_nextkey(db)); |
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| 268 | } |
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| 269 | |
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[3dd3ff] | 270 | datum dbm_nextkey(register DBM *db) |
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[92e539] | 271 | { |
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| 272 | struct stat statb; |
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| 273 | datum item; |
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[e9ad8a6] | 274 | |
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[1c0cce] | 275 | if (dbm_error(db) |
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[f6a162] | 276 | || singular_fstat(db->dbm_pagf, &statb) < 0 |
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[1c0cce] | 277 | ) |
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[573ae7] | 278 | goto err; |
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[92e539] | 279 | statb.st_size /= PBLKSIZ; |
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[3dd3ff] | 280 | for (;;) |
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| 281 | { |
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| 282 | if (db->dbm_blkptr != db->dbm_pagbno) |
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| 283 | { |
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[92e539] | 284 | db->dbm_pagbno = db->dbm_blkptr; |
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| 285 | (void) lseek(db->dbm_pagf, db->dbm_blkptr*PBLKSIZ, L_SET); |
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| 286 | if (read(db->dbm_pagf, db->dbm_pagbuf, PBLKSIZ) != PBLKSIZ) |
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[2c3da6] | 287 | memset(db->dbm_pagbuf, 0, PBLKSIZ); |
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[92e539] | 288 | #ifdef DEBUG |
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| 289 | else if (chkblk(db->dbm_pagbuf) < 0) |
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[573ae7] | 290 | db->dbm_flags |= _DBM_IOERR; |
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[92e539] | 291 | #endif |
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| 292 | } |
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[3dd3ff] | 293 | if (((short *)db->dbm_pagbuf)[0] != 0) |
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| 294 | { |
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[92e539] | 295 | item = makdatum(db->dbm_pagbuf, db->dbm_keyptr); |
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[3dd3ff] | 296 | if (item.dptr != NULL) |
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| 297 | { |
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[573ae7] | 298 | db->dbm_keyptr += 2; |
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| 299 | return (item); |
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[92e539] | 300 | } |
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| 301 | db->dbm_keyptr = 0; |
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| 302 | } |
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| 303 | if (++db->dbm_blkptr >= statb.st_size) |
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| 304 | break; |
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| 305 | } |
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| 306 | err: |
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| 307 | item.dptr = NULL; |
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| 308 | item.dsize = 0; |
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| 309 | return (item); |
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| 310 | } |
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| 311 | |
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[3dd3ff] | 312 | static void dbm_access(register DBM *db, long hash) |
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[92e539] | 313 | { |
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[3dd3ff] | 314 | for (db->dbm_hmask=0;; db->dbm_hmask=(db->dbm_hmask<<1)+1) |
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| 315 | { |
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[92e539] | 316 | db->dbm_blkno = hash & db->dbm_hmask; |
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| 317 | db->dbm_bitno = db->dbm_blkno + db->dbm_hmask; |
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| 318 | if (getbit(db) == 0) |
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| 319 | break; |
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| 320 | } |
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[3dd3ff] | 321 | if (db->dbm_blkno != db->dbm_pagbno) |
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| 322 | { |
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[92e539] | 323 | db->dbm_pagbno = db->dbm_blkno; |
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| 324 | (void) lseek(db->dbm_pagf, db->dbm_blkno*PBLKSIZ, L_SET); |
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| 325 | if (read(db->dbm_pagf, db->dbm_pagbuf, PBLKSIZ) != PBLKSIZ) |
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[2c3da6] | 326 | memset(db->dbm_pagbuf, 0, PBLKSIZ); |
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[92e539] | 327 | #ifdef DEBUG |
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| 328 | else if (chkblk(db->dbm_pagbuf) < 0) |
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| 329 | db->dbm_flags |= _DBM_IOERR; |
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| 330 | #endif |
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| 331 | } |
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| 332 | } |
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| 333 | |
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[3dd3ff] | 334 | static int getbit(register DBM *db) |
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[92e539] | 335 | { |
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| 336 | long bn; |
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[cca96f] | 337 | register int b, i, n; |
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[e9ad8a6] | 338 | |
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[92e539] | 339 | |
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| 340 | if (db->dbm_bitno > db->dbm_maxbno) |
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| 341 | return (0); |
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| 342 | n = db->dbm_bitno % BYTESIZ; |
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| 343 | bn = db->dbm_bitno / BYTESIZ; |
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| 344 | i = bn % DBLKSIZ; |
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| 345 | b = bn / DBLKSIZ; |
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[3dd3ff] | 346 | if (b != db->dbm_dirbno) |
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| 347 | { |
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[92e539] | 348 | db->dbm_dirbno = b; |
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| 349 | (void) lseek(db->dbm_dirf, (long)b*DBLKSIZ, L_SET); |
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| 350 | if (read(db->dbm_dirf, db->dbm_dirbuf, DBLKSIZ) != DBLKSIZ) |
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[2c3da6] | 351 | memset(db->dbm_dirbuf, 0, DBLKSIZ); |
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[92e539] | 352 | } |
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| 353 | return (db->dbm_dirbuf[i] & (1<<n)); |
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| 354 | } |
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| 355 | |
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[3dd3ff] | 356 | static void setbit(register DBM *db) |
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[92e539] | 357 | { |
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| 358 | long bn; |
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[cca96f] | 359 | register int i, n, b; |
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[92e539] | 360 | |
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| 361 | if (db->dbm_bitno > db->dbm_maxbno) |
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| 362 | db->dbm_maxbno = db->dbm_bitno; |
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| 363 | n = db->dbm_bitno % BYTESIZ; |
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| 364 | bn = db->dbm_bitno / BYTESIZ; |
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| 365 | i = bn % DBLKSIZ; |
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| 366 | b = bn / DBLKSIZ; |
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[3dd3ff] | 367 | if (b != db->dbm_dirbno) |
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| 368 | { |
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[92e539] | 369 | db->dbm_dirbno = b; |
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| 370 | (void) lseek(db->dbm_dirf, (long)b*DBLKSIZ, L_SET); |
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| 371 | if (read(db->dbm_dirf, db->dbm_dirbuf, DBLKSIZ) != DBLKSIZ) |
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[2c3da6] | 372 | memset(db->dbm_dirbuf, 0, DBLKSIZ); |
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[92e539] | 373 | } |
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| 374 | db->dbm_dirbuf[i] |= 1<<n; |
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| 375 | db->dbm_dirbno = b; |
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| 376 | (void) lseek(db->dbm_dirf, (long)b*DBLKSIZ, L_SET); |
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| 377 | if (write(db->dbm_dirf, db->dbm_dirbuf, DBLKSIZ) != DBLKSIZ) |
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| 378 | db->dbm_flags |= _DBM_IOERR; |
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| 379 | } |
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| 380 | |
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[3dd3ff] | 381 | static datum makdatum(char buf[PBLKSIZ], int n) |
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[92e539] | 382 | { |
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| 383 | register short *sp; |
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[cca96f] | 384 | register int t; |
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[92e539] | 385 | datum item; |
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| 386 | |
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| 387 | sp = (short *)buf; |
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[e9ad8a6] | 388 | if ((unsigned)n >= (unsigned)sp[0]) |
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| 389 | { |
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[92e539] | 390 | item.dptr = NULL; |
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| 391 | item.dsize = 0; |
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| 392 | return (item); |
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| 393 | } |
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| 394 | t = PBLKSIZ; |
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| 395 | if (n > 0) |
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| 396 | t = sp[n]; |
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| 397 | item.dptr = buf+sp[n+1]; |
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| 398 | item.dsize = t - sp[n+1]; |
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| 399 | return (item); |
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| 400 | } |
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| 401 | |
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[3dd3ff] | 402 | static int finddatum(char buf[PBLKSIZ], datum item) |
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[92e539] | 403 | { |
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| 404 | register short *sp; |
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| 405 | register int i, n, j; |
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| 406 | |
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| 407 | sp = (short *)buf; |
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| 408 | n = PBLKSIZ; |
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[3dd3ff] | 409 | for (i=0, j=sp[0]; i<j; i+=2, n = sp[i]) |
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| 410 | { |
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[92e539] | 411 | n -= sp[i+1]; |
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| 412 | if (n != item.dsize) |
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| 413 | continue; |
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[2c3da6] | 414 | if (n == 0 || memcmp(&buf[sp[i+1]], item.dptr, n) == 0) |
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[92e539] | 415 | return (i); |
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| 416 | } |
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| 417 | return (-1); |
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| 418 | } |
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| 419 | |
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| 420 | static int hitab[16] |
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| 421 | /* ken's |
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| 422 | { |
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| 423 | 055,043,036,054,063,014,004,005, |
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[573ae7] | 424 | 010,064,077,000,035,027,025,071, |
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[92e539] | 425 | }; |
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| 426 | */ |
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| 427 | = { 61, 57, 53, 49, 45, 41, 37, 33, |
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[573ae7] | 428 | 29, 25, 21, 17, 13, 9, 5, 1, |
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[92e539] | 429 | }; |
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| 430 | static long hltab[64] |
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| 431 | = { |
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[573ae7] | 432 | 06100151277L,06106161736L,06452611562L,05001724107L, |
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| 433 | 02614772546L,04120731531L,04665262210L,07347467531L, |
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| 434 | 06735253126L,06042345173L,03072226605L,01464164730L, |
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| 435 | 03247435524L,07652510057L,01546775256L,05714532133L, |
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| 436 | 06173260402L,07517101630L,02431460343L,01743245566L, |
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| 437 | 00261675137L,02433103631L,03421772437L,04447707466L, |
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| 438 | 04435620103L,03757017115L,03641531772L,06767633246L, |
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| 439 | 02673230344L,00260612216L,04133454451L,00615531516L, |
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| 440 | 06137717526L,02574116560L,02304023373L,07061702261L, |
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| 441 | 05153031405L,05322056705L,07401116734L,06552375715L, |
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| 442 | 06165233473L,05311063631L,01212221723L,01052267235L, |
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| 443 | 06000615237L,01075222665L,06330216006L,04402355630L, |
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| 444 | 01451177262L,02000133436L,06025467062L,07121076461L, |
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| 445 | 03123433522L,01010635225L,01716177066L,05161746527L, |
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| 446 | 01736635071L,06243505026L,03637211610L,01756474365L, |
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| 447 | 04723077174L,03642763134L,05750130273L,03655541561L, |
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[92e539] | 448 | }; |
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| 449 | |
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[3dd3ff] | 450 | static long hashinc(register DBM *db, long hash) |
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[92e539] | 451 | { |
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| 452 | long bit; |
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| 453 | |
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| 454 | hash &= db->dbm_hmask; |
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| 455 | bit = db->dbm_hmask+1; |
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[3dd3ff] | 456 | for (;;) |
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| 457 | { |
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[92e539] | 458 | bit >>= 1; |
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| 459 | if (bit == 0) |
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| 460 | return (0L); |
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| 461 | if ((hash & bit) == 0) |
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| 462 | return (hash | bit); |
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| 463 | hash &= ~bit; |
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| 464 | } |
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| 465 | } |
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| 466 | |
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[3dd3ff] | 467 | static long dcalchash(datum item) |
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[92e539] | 468 | { |
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| 469 | register int s, c, j; |
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| 470 | register char *cp; |
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| 471 | register long hashl; |
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| 472 | register int hashi; |
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[e9ad8a6] | 473 | |
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[92e539] | 474 | hashl = 0; |
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| 475 | hashi = 0; |
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[3dd3ff] | 476 | for (cp = item.dptr, s=item.dsize; --s >= 0; ) |
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| 477 | { |
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[92e539] | 478 | c = *cp++; |
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[3dd3ff] | 479 | for (j=0; j<BYTESIZ; j+=4) |
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| 480 | { |
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[92e539] | 481 | hashi += hitab[c&017]; |
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| 482 | hashl += hltab[hashi&63]; |
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| 483 | c >>= 4; |
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| 484 | } |
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| 485 | } |
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| 486 | return (hashl); |
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| 487 | } |
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| 488 | |
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| 489 | /* |
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| 490 | * Delete pairs of items (n & n+1). |
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| 491 | */ |
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[3dd3ff] | 492 | static int delitem(char buf[PBLKSIZ], int n) |
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[92e539] | 493 | { |
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| 494 | register short *sp, *sp1; |
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[e9ad8a6] | 495 | register int i1, i2; |
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[92e539] | 496 | |
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| 497 | sp = (short *)buf; |
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| 498 | i2 = sp[0]; |
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[e9ad8a6] | 499 | if ((unsigned)n >= (unsigned)i2 || (n & 1)) |
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[92e539] | 500 | return (0); |
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[e9ad8a6] | 501 | if (n == i2-2) |
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| 502 | { |
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[92e539] | 503 | sp[0] -= 2; |
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| 504 | return (1); |
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| 505 | } |
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| 506 | i1 = PBLKSIZ; |
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| 507 | if (n > 0) |
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| 508 | i1 = sp[n]; |
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| 509 | i1 -= sp[n+2]; |
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[3dd3ff] | 510 | if (i1 > 0) |
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| 511 | { |
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[92e539] | 512 | i2 = sp[i2]; |
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| 513 | bcopy(&buf[i2], &buf[i2 + i1], sp[n+2] - i2); |
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| 514 | } |
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| 515 | sp[0] -= 2; |
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| 516 | for (sp1 = sp + sp[0], sp += n+1; sp <= sp1; sp++) |
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| 517 | sp[0] = sp[2] + i1; |
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| 518 | return (1); |
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| 519 | } |
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| 520 | |
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| 521 | /* |
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| 522 | * Add pairs of items (item & item1). |
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| 523 | */ |
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[3dd3ff] | 524 | static int additem(char buf[PBLKSIZ], datum item, datum item1) |
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[92e539] | 525 | { |
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| 526 | register short *sp; |
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[cca96f] | 527 | register int i1, i2, tmp; |
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[92e539] | 528 | |
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| 529 | sp = (short *)buf; |
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| 530 | i1 = PBLKSIZ; |
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| 531 | i2 = sp[0]; |
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| 532 | if (i2 > 0) |
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| 533 | i1 = sp[i2]; |
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| 534 | i1 -= item.dsize + item1.dsize; |
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[2c3da6] | 535 | tmp = (i2+3) * sizeof(short); |
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| 536 | if (i1 <= tmp) return (0); |
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[92e539] | 537 | sp[0] += 2; |
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| 538 | sp[++i2] = i1 + item1.dsize; |
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| 539 | bcopy(item.dptr, &buf[i1 + item1.dsize], item.dsize); |
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| 540 | sp[++i2] = i1; |
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| 541 | bcopy(item1.dptr, &buf[i1], item1.dsize); |
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| 542 | return (1); |
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| 543 | } |
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| 544 | |
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| 545 | #ifdef DEBUG |
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[3dd3ff] | 546 | static chkblk(char buf[PBLKSIZ]) |
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[92e539] | 547 | { |
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| 548 | register short *sp; |
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| 549 | register t, i; |
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| 550 | |
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| 551 | sp = (short *)buf; |
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| 552 | t = PBLKSIZ; |
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[3dd3ff] | 553 | for (i=0; i<sp[0]; i++) |
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| 554 | { |
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[92e539] | 555 | if (sp[i+1] > t) |
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| 556 | return (-1); |
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| 557 | t = sp[i+1]; |
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| 558 | } |
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| 559 | if (t < (sp[0]+1)*sizeof(short)) |
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| 560 | return (-1); |
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| 561 | return (0); |
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| 562 | } |
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| 563 | #endif |
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| 564 | |
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| 565 | #endif /* HAVE_DBM */ |
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