postgresql/contrib/tsearch2/dict_ex.c
2003-08-04 00:43:34 +00:00

70 lines
1.2 KiB
C

/*
* 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);
}