287 lines
6.2 KiB
C
287 lines
6.2 KiB
C
/***********************************************************
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* DBM module using dictionary interface */
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#include "allobjects.h"
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#include "modsupport.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <ndbm.h>
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typedef struct {
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OB_HEAD
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int di_size; /* -1 means recompute */
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DBM *di_dbm;
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} dbmobject;
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staticforward typeobject Dbmtype;
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#define is_dbmobject(v) ((v)->ob_type == &Dbmtype)
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static object *DbmError;
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static object *
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newdbmobject(file, flags, mode)
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char *file;
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int flags;
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int mode;
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{
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dbmobject *dp;
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dp = NEWOBJ(dbmobject, &Dbmtype);
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if (dp == NULL)
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return NULL;
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dp->di_size = -1;
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if ( (dp->di_dbm = dbm_open(file, flags, mode)) == 0 ) {
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err_errno(DbmError);
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DECREF(dp);
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return 0;
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}
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return (object *)dp;
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}
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/* Methods */
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static void
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dbm_dealloc(dp)
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register dbmobject *dp;
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{
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if ( dp->di_dbm )
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dbm_close(dp->di_dbm);
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DEL(dp);
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}
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static int
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dbm_length(dp)
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dbmobject *dp;
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{
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if ( dp->di_size < 0 ) {
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datum key;
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int size;
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size = 0;
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for ( key=dbm_firstkey(dp->di_dbm); key.dptr;
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key = dbm_nextkey(dp->di_dbm))
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size++;
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dp->di_size = size;
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}
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return dp->di_size;
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}
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static object *
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dbm_subscript(dp, key)
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dbmobject *dp;
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register object *key;
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{
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object *v;
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datum drec, krec;
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if (!getargs(key, "s#", &krec.dptr, &krec.dsize) )
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return NULL;
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drec = dbm_fetch(dp->di_dbm, krec);
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if ( drec.dptr == 0 ) {
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err_setstr(KeyError, GETSTRINGVALUE((stringobject *)key));
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return 0;
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}
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if ( dbm_error(dp->di_dbm) ) {
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dbm_clearerr(dp->di_dbm);
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err_setstr(DbmError, "");
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return 0;
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}
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return newsizedstringobject(drec.dptr, drec.dsize);
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}
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static int
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dbm_ass_sub(dp, v, w)
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dbmobject *dp;
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object *v, *w;
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{
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datum krec, drec;
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if ( !getargs(v, "s#", &krec.dptr, &krec.dsize) ) {
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err_setstr(TypeError, "dbm mappings have string indices only");
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return -1;
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}
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dp->di_size = -1;
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if (w == NULL) {
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if ( dbm_delete(dp->di_dbm, krec) < 0 ) {
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dbm_clearerr(dp->di_dbm);
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err_setstr(KeyError, GETSTRINGVALUE((stringobject *)v));
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return -1;
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}
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} else {
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if ( !getargs(w, "s#", &drec.dptr, &drec.dsize) ) {
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err_setstr(TypeError,
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"dbm mappings have string elements only");
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return -1;
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}
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if ( dbm_store(dp->di_dbm, krec, drec, DBM_REPLACE) < 0 ) {
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dbm_clearerr(dp->di_dbm);
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err_setstr(DbmError, "Cannot add item to database");
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return -1;
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}
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}
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if ( dbm_error(dp->di_dbm) ) {
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dbm_clearerr(dp->di_dbm);
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err_setstr(DbmError, "");
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return -1;
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}
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return 0;
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}
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static mapping_methods dbm_as_mapping = {
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(inquiry)dbm_length, /*mp_length*/
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(binaryfunc)dbm_subscript, /*mp_subscript*/
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(objobjargproc)dbm_ass_sub, /*mp_ass_subscript*/
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};
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static object *
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dbm_keys(dp, args)
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register dbmobject *dp;
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object *args;
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{
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register object *v, *item;
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datum key;
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int err;
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if (dp == NULL || !is_dbmobject(dp)) {
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err_badcall();
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return NULL;
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}
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if (!getnoarg(args))
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return NULL;
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v = newlistobject(0);
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if (v == NULL)
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return NULL;
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for (key = dbm_firstkey(dp->di_dbm); key.dptr;
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key = dbm_nextkey(dp->di_dbm)) {
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item = newsizedstringobject(key.dptr, key.dsize);
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if (item == NULL) {
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DECREF(v);
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return NULL;
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}
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err = addlistitem(v, item);
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DECREF(item);
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if (err != 0) {
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DECREF(v);
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return NULL;
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}
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}
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return v;
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}
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static object *
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dbm_has_key(dp, args)
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register dbmobject *dp;
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object *args;
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{
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datum key, val;
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if (!getargs(args, "s#", &key.dptr, &key.dsize))
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return NULL;
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val = dbm_fetch(dp->di_dbm, key);
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return newintobject(val.dptr != NULL);
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}
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static struct methodlist dbm_methods[] = {
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{"keys", (method)dbm_keys},
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{"has_key", (method)dbm_has_key},
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{NULL, NULL} /* sentinel */
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};
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static object *
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dbm_getattr(dp, name)
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dbmobject *dp;
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char *name;
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{
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return findmethod(dbm_methods, (object *)dp, name);
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}
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static typeobject Dbmtype = {
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OB_HEAD_INIT(&Typetype)
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0,
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"Dbm_dictionary",
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sizeof(dbmobject),
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0,
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(destructor)dbm_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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(getattrfunc)dbm_getattr, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number*/
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0, /*tp_as_sequence*/
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&dbm_as_mapping, /*tp_as_mapping*/
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};
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/* ----------------------------------------------------------------- */
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static object *
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dbmopen(self, args)
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object *self;
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object *args;
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{
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char *name, *flags;
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int iflags, mode;
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if ( !getargs(args, "(ssi)", &name, &flags, &mode) )
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return 0;
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if ( strcmp(flags, "r") == 0 )
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iflags = O_RDONLY;
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else if ( strcmp(flags, "w") == 0 )
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iflags = O_WRONLY|O_CREAT;
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else if ( strcmp(flags, "rw") == 0 )
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iflags = O_RDWR|O_CREAT;
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else {
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err_setstr(DbmError,
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"Flags should be one of 'r', 'w' or 'rw'");
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return 0;
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}
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return newdbmobject(name, iflags, mode);
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}
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static struct methodlist dbmmodule_methods[] = {
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{ "open", (method)dbmopen },
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{ 0, 0 },
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};
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void
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initdbm() {
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object *m, *d;
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m = initmodule("dbm", dbmmodule_methods);
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d = getmoduledict(m);
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DbmError = newstringobject("dbm.error");
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if ( DbmError == NULL || dictinsert(d, "error", DbmError) )
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fatal("can't define dbm.error");
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}
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