bool
inner_isparent(const ltree *c, const ltree *p)
{
ltree_level *cl = LTREE_FIRST(c);
ltree_level *pl = LTREE_FIRST(p);
int pn = p->numlevel;
if (pn > c->numlevel)
return false;
while (pn > 0)
{
if (cl->len != pl->len)
return false;
if (memcmp(cl->name, pl->name, cl->len))
return false;
pn--;
cl = LEVEL_NEXT(cl);
pl = LEVEL_NEXT(pl);
}
return true;
}
static void
hashing(BITVECP sign, ltree * t)
{
int tlen = t->numlevel;
ltree_level *cur = LTREE_FIRST(t);
int hash;
while (tlen > 0)
{
hash = ltree_crc32_sz(cur->name, cur->len);
AHASH(sign, hash);
cur = LEVEL_NEXT(cur);
tlen--;
}
}
ltree *
lca_inner(ltree **a, int len)
{
int tmp,
num = ((*a)->numlevel) ? (*a)->numlevel - 1 : 0;
ltree **ptr = a + 1;
int i,
reslen = LTREE_HDRSIZE;
ltree_level *l1,
*l2;
ltree *res;
if ((*a)->numlevel == 0)
return NULL;
while (ptr - a < len)
{
if ((*ptr)->numlevel == 0)
return NULL;
else if ((*ptr)->numlevel == 1)
num = 0;
else
{
l1 = LTREE_FIRST(*a);
l2 = LTREE_FIRST(*ptr);
tmp = num;
num = 0;
for (i = 0; i < Min(tmp, (*ptr)->numlevel - 1); i++)
{
if (l1->len == l2->len && strncmp(l1->name, l2->name, l1->len) == 0)
num = i + 1;
else
break;
l1 = LEVEL_NEXT(l1);
l2 = LEVEL_NEXT(l2);
}
}
ptr++;
}
l1 = LTREE_FIRST(*a);
for (i = 0; i < num; i++)
{
reslen += MAXALIGN(l1->len + LEVEL_HDRSIZE);
l1 = LEVEL_NEXT(l1);
}
res = (ltree *) palloc(reslen);
SET_VARSIZE(res, reslen);
res->numlevel = num;
l1 = LTREE_FIRST(*a);
l2 = LTREE_FIRST(res);
for (i = 0; i < num; i++)
{
memcpy(l2, l1, MAXALIGN(l1->len + LEVEL_HDRSIZE));
l1 = LEVEL_NEXT(l1);
l2 = LEVEL_NEXT(l2);
}
return res;
}
Datum
ltree_in(PG_FUNCTION_ARGS)
{
char *buf = (char *) PG_GETARG_POINTER(0);
char *ptr;
nodeitem *list,
*lptr;
int num = 0,
totallen = 0;
int state = LTPRS_WAITNAME;
ltree *result;
ltree_level *curlevel;
int charlen;
int pos = 0;
ptr = buf;
while (*ptr)
{
charlen = pg_mblen(ptr);
if (charlen == 1 && t_iseq(ptr, '.'))
num++;
ptr += charlen;
}
if (num + 1 > MaxAllocSize / sizeof(nodeitem))
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("number of levels (%d) exceeds the maximum allowed (%d)",
num + 1, (int) (MaxAllocSize / sizeof(nodeitem)))));
list = lptr = (nodeitem *) palloc(sizeof(nodeitem) * (num + 1));
ptr = buf;
while (*ptr)
{
charlen = pg_mblen(ptr);
if (state == LTPRS_WAITNAME)
{
if (ISALNUM(ptr))
{
lptr->start = ptr;
lptr->wlen = 0;
state = LTPRS_WAITDELIM;
}
else
UNCHAR;
}
else if (state == LTPRS_WAITDELIM)
{
if (charlen == 1 && t_iseq(ptr, '.'))
{
lptr->len = ptr - lptr->start;
if (lptr->wlen > 255)
ereport(ERROR,
(errcode(ERRCODE_NAME_TOO_LONG),
errmsg("name of level is too long"),
errdetail("Name length is %d, must "
"be < 256, in position %d.",
lptr->wlen, pos)));
totallen += MAXALIGN(lptr->len + LEVEL_HDRSIZE);
lptr++;
state = LTPRS_WAITNAME;
}
else if (!ISALNUM(ptr))
UNCHAR;
}
else
/* internal error */
elog(ERROR, "internal error in parser");
ptr += charlen;
lptr->wlen++;
pos++;
}
if (state == LTPRS_WAITDELIM)
{
lptr->len = ptr - lptr->start;
if (lptr->wlen > 255)
ereport(ERROR,
(errcode(ERRCODE_NAME_TOO_LONG),
errmsg("name of level is too long"),
errdetail("Name length is %d, must "
"be < 256, in position %d.",
lptr->wlen, pos)));
totallen += MAXALIGN(lptr->len + LEVEL_HDRSIZE);
lptr++;
}
else if (!(state == LTPRS_WAITNAME && lptr == list))
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error"),
errdetail("Unexpected end of line.")));
result = (ltree *) palloc0(LTREE_HDRSIZE + totallen);
SET_VARSIZE(result, LTREE_HDRSIZE + totallen);
result->numlevel = lptr - list;
curlevel = LTREE_FIRST(result);
lptr = list;
while (lptr - list < result->numlevel)
{
curlevel->len = (uint16) lptr->len;
memcpy(curlevel->name, lptr->start, lptr->len);
curlevel = LEVEL_NEXT(curlevel);
lptr++;
}
pfree(list);
PG_RETURN_POINTER(result);
}
