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/*
* example of dictionary
* Teodor Sigaev <teodor@sigaev.ru>
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "postgres.h"
#include "dict.h"
#include "common.h"
typedef struct {
StopList stoplist;
} DictExample;
PG_FUNCTION_INFO_V1(dex_init);
Datum dex_init(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(dex_lexize);
Datum dex_lexize(PG_FUNCTION_ARGS);
Datum
dex_init(PG_FUNCTION_ARGS) {
DictExample *d = (DictExample*)malloc( sizeof(DictExample) );
if ( !d )
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
memset(d,0,sizeof(DictExample));
d->stoplist.wordop=lowerstr;
if ( !PG_ARGISNULL(0) && PG_GETARG_POINTER(0)!=NULL ) {
text *in = PG_GETARG_TEXT_P(0);
readstoplist(in, &(d->stoplist));
sortstoplist(&(d->stoplist));
PG_FREE_IF_COPY(in, 0);
}
PG_RETURN_POINTER(d);
}
Datum
dex_lexize(PG_FUNCTION_ARGS) {
DictExample *d = (DictExample*)PG_GETARG_POINTER(0);
char *in = (char*)PG_GETARG_POINTER(1);
char *txt = pnstrdup(in, PG_GETARG_INT32(2));
char **res=palloc(sizeof(char*)*2);
if ( *txt=='\0' || searchstoplist(&(d->stoplist),txt) ) {
pfree(txt);
res[0]=NULL;
} else
res[0]=txt;
res[1]=NULL;
PG_RETURN_POINTER(res);
}
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