Datum
levenshtein(PG_FUNCTION_ARGS)
{
text *src = PG_GETARG_TEXT_PP(0);
text *dst = PG_GETARG_TEXT_PP(1);
const char *s_data;
const char *t_data;
int s_bytes,
t_bytes;
/* Extract a pointer to the actual character data */
s_data = VARDATA_ANY(src);
t_data = VARDATA_ANY(dst);
/* Determine length of each string in bytes and characters */
s_bytes = VARSIZE_ANY_EXHDR(src);
t_bytes = VARSIZE_ANY_EXHDR(dst);
PG_RETURN_INT32(varstr_levenshtein(s_data, s_bytes, t_data, t_bytes, 1, 1,
1));
}
Datum
levenshtein_with_costs(PG_FUNCTION_ARGS)
{
text *src = PG_GETARG_TEXT_PP(0);
text *dst = PG_GETARG_TEXT_PP(1);
int ins_c = PG_GETARG_INT32(2);
int del_c = PG_GETARG_INT32(3);
int sub_c = PG_GETARG_INT32(4);
const char *s_data;
const char *t_data;
int s_bytes,
t_bytes;
/* Extract a pointer to the actual character data */
s_data = VARDATA_ANY(src);
t_data = VARDATA_ANY(dst);
/* Determine length of each string in bytes */
s_bytes = VARSIZE_ANY_EXHDR(src);
t_bytes = VARSIZE_ANY_EXHDR(dst);
PG_RETURN_INT32(varstr_levenshtein(s_data, s_bytes, t_data, t_bytes,
ins_c, del_c, sub_c, false));
}