static int
zerofill_record(struct cdb_make *cdbmp, unsigned rpos, unsigned rlen) {
if (rpos + rlen == cdbmp->cdb_dpos) {
cdbmp->cdb_dpos = rpos;
return 0;
}
if (lseek(cdbmp->cdb_fd, rpos, SEEK_SET) < 0)
return -1;
memset(cdbmp->cdb_buf, 0, sizeof(cdbmp->cdb_buf));
cdb_pack(rlen - 8, cdbmp->cdb_buf + 4);
for(;;) {
rpos = rlen > sizeof(cdbmp->cdb_buf) ? sizeof(cdbmp->cdb_buf) : rlen;
if (_cdb_make_fullwrite(cdbmp->cdb_fd, cdbmp->cdb_buf, rpos) < 0)
return -1;
rlen -= rpos;
if (!rlen) return 0;
memset(cdbmp->cdb_buf + 4, 0, 4);
}
}
int
cdb_make_put(struct cdb_make *cdbmp,
const void *key, unsigned klen,
const void *val, unsigned vlen,
int flags)
{
unsigned char rlen[8];
unsigned hval = cdb_hash(key, klen);
struct cdb_rl *rl;
int c, r;
switch(flags) {
case CDB_PUT_REPLACE:
case CDB_PUT_INSERT:
case CDB_PUT_WARN:
c = _cdb_make_find(cdbmp, key, klen, hval, &rl);
if (c < 0)
return -1;
if (c) {
if (flags == CDB_PUT_INSERT)
return errno = EEXIST, 1;
else if (flags == CDB_PUT_REPLACE) {
--c;
r = 1;
break;
}
else
r = 1;
}
/* fall */
case CDB_PUT_ADD:
rl = cdbmp->cdb_rec[hval&255];
if (!rl || rl->cnt >= sizeof(rl->rec)/sizeof(rl->rec[0])) {
rl = (struct cdb_rl*)xmalloc(sizeof(struct cdb_rl));
if (!rl)
return errno = ENOMEM, -1;
rl->cnt = 0;
rl->next = cdbmp->cdb_rec[hval&255];
cdbmp->cdb_rec[hval&255] = rl;
}
c = rl->cnt;
r = 0;
break;
default:
return errno = EINVAL, -1;
}
if (klen > 0xffffffff - (cdbmp->cdb_dpos + 8) ||
vlen > 0xffffffff - (cdbmp->cdb_dpos + klen + 8))
return errno = ENOMEM, -1;
rl->rec[c].hval = hval;
rl->rec[c].rpos = cdbmp->cdb_dpos;
if ((unsigned)c == rl->cnt) {
++rl->cnt;
++cdbmp->cdb_rcnt;
}
cdb_pack(klen, rlen);
cdb_pack(vlen, rlen + 4);
if (_cdb_make_write(cdbmp, (const char *)rlen, 8) < 0 ||
_cdb_make_write(cdbmp, (const char *)key, klen) < 0 ||
_cdb_make_write(cdbmp, (const char *)val, vlen) < 0)
return -1;
return r;
}