Datum
bpcharne(PG_FUNCTION_ARGS)
{
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
int len1,
len2;
bool result;
len1 = bcTruelen(arg1);
len2 = bcTruelen(arg2);
/*
* Since we only care about equality or not-equality, we can avoid all
* the expense of strcoll() here, and just do bitwise comparison.
*/
if (len1 != len2)
result = true;
else
result = (strncmp(VARDATA(arg1), VARDATA(arg2), len1) != 0);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result);
}
Datum
bpchar_smaller(PG_FUNCTION_ARGS)
{
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
int len1,
len2;
int cmp;
len1 = bcTruelen(arg1);
len2 = bcTruelen(arg2);
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
PG_RETURN_BPCHAR_P((cmp <= 0) ? arg1 : arg2);
}
Datum
bpcharcmp(PG_FUNCTION_ARGS)
{
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
int len1,
len2;
int cmp;
len1 = bcTruelen(arg1);
len2 = bcTruelen(arg2);
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_INT32(cmp);
}
Datum
bpcharne(PG_FUNCTION_ARGS)
{
BpChar *arg1 = PG_GETARG_BPCHAR_P(0);
BpChar *arg2 = PG_GETARG_BPCHAR_P(1);
int len1,
len2;
bool result;
len1 = bcTruelen(arg1);
len2 = bcTruelen(arg2);
/* fast path for different-length inputs */
if (len1 != len2)
result = true;
else
result = (varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2) != 0);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result);
}
Datum
bpcharlen(PG_FUNCTION_ARGS)
{
BpChar *arg = PG_GETARG_BPCHAR_P(0);
int len;
/* get number of bytes, ignoring trailing spaces */
len = bcTruelen(arg);
/* in multibyte encoding, convert to number of characters */
if (pg_database_encoding_max_length() != 1)
len = pg_mbstrlen_with_len(VARDATA(arg), len);
PG_RETURN_INT32(len);
}
/*
* bpchar needs a specialized hash function because we want to ignore
* trailing blanks in comparisons.
*
* XXX is there any need for locale-specific behavior here?
*/
Datum
hashbpchar(PG_FUNCTION_ARGS)
{
BpChar *key = PG_GETARG_BPCHAR_P(0);
char *keydata;
int keylen;
Datum result;
keydata = VARDATA(key);
keylen = bcTruelen(key);
result = hash_any((unsigned char *) keydata, keylen);
/* Avoid leaking memory for toasted inputs */
PG_FREE_IF_COPY(key, 0);
return result;
}
