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/* |
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The Malete project - the Z39.2/Z39.50 database framework of OpenIsis. |
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Version 0.9.x (patchlevel see file Version) |
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Copyright (C) 2001-2003 by Erik Grziwotz, erik@openisis.org |
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|
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public |
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License as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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|
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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See the GNU Lesser General Public License for more details. |
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|
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You should have received a copy of the GNU Lesser General Public |
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License along with this library; if not, write to the Free Software |
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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|
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see README for more information |
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EOH */ |
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|
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/* |
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$Id: db.c,v 1.27 2004/11/08 12:00:12 kripke Exp $ |
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implementation of general db access functions. |
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*/ |
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|
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|
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#include "core/core.h" |
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|
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|
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/* ************************************************************ |
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private types |
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*/ |
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|
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/** file extensions not listed on filext.com */ |
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|
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/** B-Link-Tree malete query data/index */ |
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static const char EXT_MQD[] = ".mqd"; |
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static const char EXT_MQX[] = ".mqx"; |
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/** plaintext malete record data/index */ |
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static const char EXT_MRD[] = ".mrd"; |
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static const char EXT_MRX[] = ".mrx"; |
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/** record 0 options data */ |
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static const char EXT_M0D[] = ".m0d"; |
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|
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|
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|
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/* ************************************************************ |
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data |
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*/ |
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|
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/* linked list of open dbs. */ |
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static Db *dbs; |
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|
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|
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enum { |
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/* additional flg outside the short range */ |
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OPEN_TRY = 0x10000, /* try writable, open readonly else */ |
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OPEN_UC = 0x20000, /* use uppercase ext */ |
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/* commonly used combinations */ |
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/* 1) open as is, do not complain about any failure, do not create */ |
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OPEN_ASIS = FIL_RDWR|OPEN_TRY, |
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/* 2) open readonly, do not complain about any failure, do not create */ |
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OPEN_RDIF = FIL_RD|FIL_TRY, |
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/* 3) open readonly, complain about any failure */ |
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OPEN_RD = FIL_RD, |
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/* 4) open or create writable, complain on failure */ |
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OPEN_NEW = FIL_RDWR|FIL_CREAT, |
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OPEN_BLANK = FIL_RDWR|FIL_CREAT|FIL_TRUNC |
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}; |
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|
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|
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/* set extension. fname MUST already end with .xxx. |
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*/ |
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static char *setext ( char *fname, const char *ext ) |
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{ |
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int l = strlen( fname ) - 4; |
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memcpy( fname+l, ext, 4 ); |
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return fname; |
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} |
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|
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|
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Db *dOpen (const char *dbname) |
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{ |
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const Fld *cfg; |
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Fld opt; |
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file optf; |
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/* options during open */ |
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int withrdx = !0; |
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int withqdx = !0; |
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int filmode = FIL_RD, async = DX_ASYNC; /* changed by -w */ |
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int lck = FIL_TLOCK; /* set to BLOCK by -b */ |
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/* misc vars */ |
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Db *db; |
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int plen, ret = 0; |
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|
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#ifdef BUILD_SHMODE |
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if (ENV_SHARED==env.wri) async = 0; /* default to sync */ |
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#endif |
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for ( db = dbs; db; db = db->nxt ) |
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if ( !strcmp(db->nam, dbname) ) { |
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if ( DX_OPEN & db->flg ) { |
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db->mnt++; |
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return db; |
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} |
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return 0; /* hmmm ... should not be here */ |
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} |
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|
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cfg = rKey(env.opt->fld, 1, dbname); |
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db = mAlloc(sizeof(Db)); |
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db->rdx.mrd = db->rdx.mrx.fil = FIL_NONE; |
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db->rdx.mrx.lim = env.rml; |
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db->qdx.mqd = db->qdx.mqx.fil = FIL_NONE; |
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db->qdx.mqx.lim = env.qml; |
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plen = strlen(dbname); |
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memcpy(db->nam = mAlloc(plen+1), dbname, plen+1); |
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|
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/* pre-options defaults */ |
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db->qdx.typ = QDX_LEAF1K; |
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db->qdx.ptr = QDX_ISIS; |
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db->qdx.ksz = 255; |
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if ( env.wri ) |
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db->flg |= DX_WRITE; |
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|
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if ( cfg ) for ( opt.val = 0; vGet(&opt, cfg, "bfqrw"); ) |
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switch (opt.tag) { |
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case 'b': /* blocking */ |
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lck = FIL_BLOCK; |
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continue; |
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case 'f': /* file/path */ |
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if ( !opt.len ) { |
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eRr(LOG_WARN, "bad empty file"); |
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continue; |
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} |
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db->pat = mAlloc(opt.len + plen + 5); |
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memcpy(db->pat, opt.val, opt.len); |
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switch ( opt.val[opt.len - 1] ) { |
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case '/': |
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#ifdef WIN32 |
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case '\\': |
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#endif |
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memcpy(db->pat+opt.len, dbname, plen); |
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plen += opt.len; |
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break; |
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default: |
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plen = opt.len; |
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} |
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eRr(LOG_INFO, "using path %.*s", plen, db->pat); |
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continue; |
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case 'q': /* qdx type */ |
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if ( !opt.len ) |
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withqdx = 0; |
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else { |
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unsigned char val = (unsigned char) a2i(opt.val+1, opt.len-1); |
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switch (*opt.val) { |
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case 'k': db->qdx.ksz = val; break; |
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case 'l': db->qdx.let = val; break; |
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case 'p': db->qdx.ptr = val; break; |
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case 't': db->qdx.typ = val; break; |
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} |
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} |
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continue; |
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case 'r': /* mrx type */ |
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if ( !opt.len ) |
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withrdx = 0; |
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else |
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db->rdx.typ = a2i(opt.val, opt.len); |
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continue; |
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case 'w': /* writable */ |
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if ( opt.len ) |
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switch ( *opt.val ) { |
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case '0': db->flg &= ~DX_WRITE; break; |
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case 'a': async = DX_ASYNC; break; |
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case 's': async = 0; break; |
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} |
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continue; |
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} |
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|
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/* post-options defaults */ |
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if ( DX_WRITE & db->flg ) { |
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db->rdx.flg |= DX_WRITE; |
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db->qdx.flg |= DX_WRITE; |
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filmode |= FIL_WR|FIL_CREAT; |
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if ( !(DX_ASYNC & (db->flg |= async)) ) |
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filmode |= FIL_SYNC; |
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} |
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if ( !db->pat ) |
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memcpy(db->pat = mAlloc(plen+5), dbname, plen); |
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memcpy(db->pat+plen, ".???", 5); |
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|
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#if 1 |
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/* check options file */ |
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if ( ! fOpen(&optf, setext(db->pat,EXT_M0D), FIL_RD|FIL_TRY) ) { |
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char buf[0x10000]; |
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int sz; |
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if ( 0 < (sz = fSize(optf)) ) { |
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char *p = sz < (int)sizeof(buf) ? buf : mAlloc(sz); |
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eRr(LOG_INFO, "reading %d bytes options from '%s'", sz, db->pat); |
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if ( sz == fRead(&optf, p, sz) ) { |
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List dbopt; |
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lParse(lInit(&dbopt,0), p, sz); |
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db->opt = LCAN(&dbopt); |
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} |
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if ( buf != p ) |
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mFree(p); |
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} |
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fClose(&optf); |
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} |
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#endif |
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|
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#ifdef BUILD_SHMODE |
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if (ENV_SHARED==env.wri) lck = 0; /* we lock on demand */ |
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#endif |
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#define CLEANUP( args ) do { ret = eRr args; goto cleanup; } while (0) |
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if ( withrdx ) { |
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if ( fOpen( &db->rdx.mrd, setext(db->pat,EXT_MRD), filmode|lck ) ) |
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CLEANUP((LOG_ERROR, "no master file '%s'", db->pat )); |
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if ( fMOpen( &db->rdx.mrx, setext(db->pat,EXT_MRX), filmode ) ) |
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CLEANUP((LOG_ERROR, "no pointer file '%s'", db->pat )); |
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if ( rInit( &db->rdx ) ) |
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CLEANUP((LOG_ERROR, "could not rInit '%s'", db->pat )); |
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} |
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|
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if ( withqdx ) { |
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if (db->opt) |
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db->qdx.cdx = cOpen(db->opt); |
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if ( fOpen( &db->qdx.mqd, setext(db->pat,EXT_MQD), filmode|lck ) ) |
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CLEANUP((LOG_ERROR, "no index leaves file '%s'", db->pat )); |
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if ( fMOpen( &db->qdx.mqx, setext(db->pat,EXT_MQX), filmode ) ) |
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CLEANUP((LOG_ERROR, "no index tree file '%s'", db->pat )); |
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if ( qInit( &db->qdx ) ) |
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CLEANUP((LOG_ERROR, "could not qInit '%s'", db->pat )); |
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} |
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|
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db->pat[plen] = 0; /* cut .ext */ |
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db->flg |= DX_OPEN; |
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db->nxt = dbs; |
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dbs = db; |
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return db; |
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|
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cleanup: |
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/* cleanup ... */ |
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db->flg = 0; |
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fClose( &db->qdx.mqd ); |
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fMClose( &db->qdx.mqx ); |
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fClose( &db->rdx.mrd ); |
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fMClose( &db->rdx.mrx ); |
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return 0; |
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} /* dOpen */ |
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|
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|
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void dClose ( Db *db ) |
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{ |
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Db **d; |
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|
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for ( d = &dbs; *d; d = &(*d)->nxt ) /* unlink */ |
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if ( db == *d ) { |
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if ( --db->mnt ) |
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return; |
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*d = db->nxt; |
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break; |
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} |
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if ( FIL_NONE != db->rdx.mrd ) { |
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rFini( &db->rdx ); |
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fClose( &db->rdx.mrd ); |
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fMClose( &db->rdx.mrx ); |
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} |
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if ( FIL_NONE != db->qdx.mqd ) { |
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qFini( &db->qdx ); |
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fClose( &db->qdx.mqd ); |
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fMClose( &db->qdx.mqx ); |
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} |
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db->flg = 0L; |
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mFree( (void*)db->pat ); |
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mFree( (void*)db->opt ); |
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mFree( (void*)db->nam ); |
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memset( db, 0, sizeof(db) ); |
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mFree( db ); |
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} /* dClose */ |
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|
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|
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void dCloseAll () |
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{ |
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Db *d, *nxt; |
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for ( d = dbs; d; d = nxt ) { |
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nxt = d->nxt; |
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dClose(d); |
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} |
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} /* dCloseAll */ |
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