/* Copyright (c) 2007-2010, Dirk Krause All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above opyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the Dirk Krause nor the names of contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /** @file dksdgdbm.c Simple database API for GDBM databases. */ #include "dk.h" #if DK_HAVE_STRING_H #include #endif #if DK_HAVE_FCNTL_H #include #endif #if DK_HAVE_IO_H #include #endif #include "dkmem.h" #include "dkstr.h" /** Inside the dksdgdbm module. */ #define DKSDBI_GDBM 1 #include "dksdbi.h" #include "dksdbii.h" $(trace-include) #if DK_HAVE_GDBM_H #include /** Open database for writing. @param p Simple database API structure. @return GDBM file opened for writing (success) or NULL (error). */ static GDBM_FILE open_writer DK_P1(dk_sdbi_db *,p) { GDBM_FILE back = NULL; int wrmode; int b; $? "+ open_writer" wrmode = GDBM_WRCREAT; if((p->acc) & DK_SDBI_MODE_TRUNCATE) { if(!(p->did_truncate)) { p->did_truncate = 1; wrmode = GDBM_NEWDB; } } b = p->blksize; if(!b) { b = 512; } back = gdbm_open(p->fn, b, wrmode, p->tfm, NULL); $? "- open_writer %s", TR_PTR(back) return back; } /** Open database for reading. @param p Simple database API structure. @return GDBM file opened for reading (success) or NULL (error). */ static GDBM_FILE open_reader DK_P1(dk_sdbi_db *,p) { GDBM_FILE back = NULL; int b; $? "+ open_reader" b = p->blksize; if(!b) { b = 512; } back = gdbm_open(p->fn, b, GDBM_READER, p->tfm, NULL); $? "- open_reader %s", TR_PTR(back) return back; } int dksdbi_gdbm_close DK_P1(dk_sdbi_db *,p) { int back = 0; GDBM_FILE dbf = NULL; $? "+ dksdbi_gdbm_close" if(p->acc != DK_SDBI_MODE_RDWR) { dbf = (GDBM_FILE)(p->dbptr); if(dbf) { gdbm_close(dbf); p->dbptr = NULL; } } $? "- dksdbi_gdbm_close %d", back return back; } int dksdbi_gdbm_open DK_P1(dk_sdbi_db *,p) { int back = 0; GDBM_FILE dbf; $? "+ dksdbi_gdbm_open" if(p->acc == DK_SDBI_MODE_RDWR) { dbf = open_writer(p); if(dbf) { gdbm_close(dbf); dbf = open_reader(p); if(dbf) { gdbm_close(dbf); back = 1; } } } else { if((p->acc) & DK_SDBI_MODE_WRITE) { dbf = open_writer(p); if(dbf) { p->dbptr = (void *)dbf; back = 1; } } else { if((p->acc) & DK_SDBI_MODE_READ) { dbf = open_reader(p); if(dbf) { p->dbptr = (void *)dbf; back = 1; } } } } $? "- dksdbi_gdbm_open %d", back return back; } int dksdbi_gdbm_store DK_P6(dk_sdbi_db *,p, void *,kp, size_t,kl, void *,vp, size_t,vl, int,insmod) { int back = 0; GDBM_FILE dbf = NULL; datum k, v; int ret; $? "+ dksdbi_gdbm_store" if(p->acc == DK_SDBI_MODE_RDWR) { dbf = open_writer(p); } else { dbf = (GDBM_FILE)(p->dbptr); } if(dbf) { DK_MEMRES(&k,sizeof(datum)) ; DK_MEMRES(&v,sizeof(datum)) ; k.dptr = kp; k.dsize = kl; v.dptr = vp; v.dsize = vl; ret = gdbm_store(dbf, k, v, GDBM_INSERT); if(ret == 0) { back = 1; } else { if(ret == 1) { DK_MEMRES(&k,sizeof(datum)) ; DK_MEMRES(&v,sizeof(datum)) ; k.dptr = kp; k.dsize = kl; v.dptr = vp; v.dsize = vl; ret = gdbm_store(dbf, k, v, GDBM_REPLACE); if(ret == 0) { back = 1; } } } } if(p->acc == DK_SDBI_MODE_RDWR) { if(dbf) { gdbm_close(dbf); } } $? "- dksdbi_gdbm_store %d", back return back; } int dksdbi_gdbm_delete DK_P3(dk_sdbi_db *,p, char *,kp, size_t,kl) { int back = 0; GDBM_FILE dbf; datum k; int ret; $? "+ dksdbi_gdbm_delete" if((p->acc) == DK_SDBI_MODE_RDWR) { dbf = open_writer(p); } else { dbf = (GDBM_FILE)(p->dbptr); } if(dbf) { DK_MEMRES(&k,sizeof(datum)) ; k.dptr = kp; k.dsize = kl; ret = gdbm_delete(dbf, k); if(ret == 0) { back = 1; } } if((p->acc) == DK_SDBI_MODE_RDWR) { if(dbf) { gdbm_close(dbf); } } $? "- dksdbi_gdbm_delete %d", back return back; } int dksdbi_gdbm_fetch DK_P5(dk_sdbi_db *,p, void *,kp, size_t,kl, void *,vp, size_t *,vl) { int back = 0; datum k, v; GDBM_FILE dbf; $? "+ dksdbi_gdbm_fetch" if(p->acc == DK_SDBI_MODE_RDWR) { dbf = open_reader(p); } else { dbf = (GDBM_FILE)(p->dbptr); } if(dbf) { DK_MEMRES(&k,sizeof(datum)) ; DK_MEMRES(&v,sizeof(datum)) ; k.dptr = kp; k.dsize = kl; v = gdbm_fetch(dbf, k); if(v.dptr) { if(v.dsize <= (*vl)) { DK_MEMCPY(vp,v.dptr,v.dsize); *vl = v.dsize; back = 1; } else { DK_MEMCPY(vp,v.dptr,(*vl)); back = -1; } free(v.dptr); } else { } } if(p->acc == DK_SDBI_MODE_RDWR) { if(dbf) { gdbm_close(dbf); } } $? "- dksdbi_gdbm_fetch %d", back return back; } int dksdbi_gdbm_string_fetch DK_P4(dk_sdbi_db *,p, char *,kp, char *,vp, size_t,s) { int back = 0; GDBM_FILE dbf; datum k, v; $? "+ dksdbi_gdbm_string_fetch" if(p->acc == DK_SDBI_MODE_RDWR) { dbf = open_reader(p); } else { dbf = (GDBM_FILE)(p->dbptr); } if(dbf) { DK_MEMRES(&k,sizeof(datum)) ; DK_MEMRES(&v,sizeof(datum)) ; k.dptr = kp; k.dsize = (1 + strlen(kp)); v = gdbm_fetch(dbf, k); if(v.dptr) { if(v.dsize) { if(v.dsize < s) { DK_MEMCPY(vp,v.dptr,v.dsize) ; vp[v.dsize] = '\0'; back = 1; } else { DK_MEMCPY(vp,v.dptr,(s-1)) ; vp[s-1] = '\0'; back = -1; } } free(v.dptr); } } if(p->acc == DK_SDBI_MODE_RDWR) { if(dbf) { gdbm_close(dbf); } } $? "- dksdbi_gdbm_string_fetch %d", back return back; } int dksdbi_gdbm_traverse DK_P3(dk_sdbi_db *,p, void *,d, dk_sdbi_fct_t *,f) { int back = 0; GDBM_FILE dbf; datum k, nk, v; int cc = 0, found = 0, is_first = 0, can_run = 0; $? "+ dksdbi_gdbm_traverse" if(p->acc == DK_SDBI_MODE_RDWR) { dbf = open_reader(p); } else { dbf = (GDBM_FILE)(p->dbptr); } if(dbf) { cc = 1; found = 0; back = 1; is_first = 1; DK_MEMRES(&k,sizeof(datum)) ; DK_MEMRES(&nk,sizeof(datum)) ; DK_MEMRES(&v,sizeof(datum)) ; while(cc) { can_run = 0; if(is_first) { is_first = 0; k = gdbm_firstkey(dbf); if(k.dptr) { can_run = 1; } else { cc = 0; } } else { nk = gdbm_nextkey(dbf, k); free(k.dptr); k = nk; DK_MEMRES(&nk,sizeof(datum)) ; if(k.dptr) { can_run = 1; } else { cc = 0; } } if(can_run) { v = gdbm_fetch(dbf, k); if(v.dptr) { if(v.dsize) { found = 1; switch((*f)(d, k.dptr, k.dsize, v.dptr, v.dsize)) { case -1: { cc = 0; back = 0; } break; } } free(v.dptr); } } } if(k.dptr) { free(k.dptr); } if(!found) { back = 0; } } if(p->acc == DK_SDBI_MODE_RDWR) { if(dbf) { gdbm_close(dbf); } } $? "- dksdbi_gdbm_traverse %d", back return back; } int dksdbi_gdbm_sync DK_P1(dk_sdbi_db *,p) { int back = 0; $? "+ dksdbi_gdbm_sync" if(p->acc == DK_SDBI_MODE_RDWR) { back = 1; } else { if((p->acc) & DK_SDBI_MODE_WRITE) { if(p->dbptr) { gdbm_sync((GDBM_FILE)(p->dbptr)); back = 1; } } } $? "- dksdbi_gdbm_sync %d", back return back; } #endif