static int
db_exec(lua_State *T)
{
struct db *db;
const char *sql;
size_t len;
unsigned int bind;
luaL_checktype(T, 1, LUA_TUSERDATA);
sql = luaL_checklstring(T, 2, &len);
bind = lua_gettop(T) > 2;
if (bind) {
luaL_checktype(T, 3, LUA_TTABLE);
lua_settop(T, 3);
lua_replace(T, 2);
}
db = db_unbox(T, 1);
if (db == NULL)
return db_closed(T);
if (db->T != NULL)
return db_busy(T);
db->T = T;
db->req.prep.sql = sql;
db->req.prep.len = len+1;
lem_async_do(&db->a, db_prepare_work, db_exec_prepare_reap);
return lua_yield(T, bind ? 2 : 1);
}
static int
file_seek(lua_State *T)
{
static const int mode[] = { SEEK_SET, SEEK_CUR, SEEK_END };
static const char *const modenames[] = { "set", "cur", "end", NULL };
struct file *f;
int op;
lua_Number offset;
luaL_checktype(T, 1, LUA_TUSERDATA);
op = luaL_checkoption(T, 2, "cur", modenames);
offset = luaL_optnumber(T, 3, 0.);
f = lua_touserdata(T, 1);
f->seek.offset = (off_t)offset;
luaL_argcheck(T, (lua_Number)f->seek.offset == offset, 3,
"not an integer in proper range");
if (f->fd < 0)
return io_closed(T);
if (f->T != NULL)
return io_busy(T);
/* flush input buffer */
lem_inputbuf_init(&f->buf);
f->T = T;
f->seek.whence = mode[op];
lem_async_do(&f->a, file_seek_work, file_seek_reap);
lua_settop(T, 1);
return lua_yield(T, 1);
}
static int
db_prepare(lua_State *T)
{
struct db *db;
const char *sql;
size_t len;
luaL_checktype(T, 1, LUA_TUSERDATA);
sql = luaL_checklstring(T, 2, &len);
db = db_unbox(T, 1);
if (db == NULL)
return db_closed(T);
if (db->T != NULL)
return db_busy(T);
db->T = T;
db->refs++;
db->req.prep.sql = sql;
db->req.prep.len = len+1;
lem_async_do(&db->a, db_prepare_work, db_prepare_reap);
lua_settop(T, 2);
lua_pushvalue(T, lua_upvalueindex(1));
return lua_yield(T, 3);
}
static int
file_readp(lua_State *T)
{
struct file *f;
struct lem_parser *p;
int ret;
luaL_checktype(T, 1, LUA_TUSERDATA);
ret = lua_type(T, 2);
if (ret != LUA_TUSERDATA && ret != LUA_TLIGHTUSERDATA)
return luaL_argerror(T, 2, "expected userdata");
f = lua_touserdata(T, 1);
if (f->fd < 0)
return io_closed(T);
if (f->T != NULL)
return io_busy(T);
p = lua_touserdata(T, 2);
if (p->init)
p->init(T, &f->buf);
ret = p->process(T, &f->buf);
if (ret > 0)
return ret;
f->T = T;
f->readp.p = p;
lem_async_do(&f->a, file_readp_work, file_readp_reap);
return lua_yield(T, lua_gettop(T));
}
static int
file_gc(lua_State *T)
{
struct file *f = lua_touserdata(T, 1);
lem_debug("collecting %p, fd = %d", f, f->fd);
if (f->fd >= 0) {
struct file_gc *gc = lem_xmalloc(sizeof(struct file_gc));
gc->fd = f->fd;
f->fd = -1;
lem_async_do(&gc->a, file_gc_work, NULL);
}
return 0;
}
static int
file_close(lua_State *T)
{
struct file *f;
luaL_checktype(T, 1, LUA_TUSERDATA);
f = lua_touserdata(T, 1);
if (f->fd < 0)
return io_closed(T);
if (f->T != NULL)
return io_busy(T);
f->T = T;
lem_async_do(&f->a, file_close_work, file_close_reap);
lua_settop(T, 1);
return lua_yield(T, 1);
}
static int
stmt_step(lua_State *T)
{
struct stmt *stmt;
struct db *db;
luaL_checktype(T, 1, LUA_TUSERDATA);
stmt = lua_touserdata(T, 1);
if (stmt->handle == NULL)
return stmt_finalized(T);
db = stmt->db;
if (db->T != NULL)
return db_busy(T);
db->T = T;
db->req.prep.stmt = stmt->handle;
lem_async_do(&db->a, db_step_work, stmt_step_reap);
lua_settop(T, 1);
return lua_yield(T, 1);
}
static int
stream_sendfile(lua_State *T)
{
struct stream *s;
struct file *f;
off_t size;
off_t offset;
struct sfhandle *sf;
luaL_checktype(T, 1, LUA_TUSERDATA);
luaL_checktype(T, 2, LUA_TUSERDATA);
size = (off_t)luaL_checknumber(T, 3);
offset = (off_t)luaL_optnumber(T, 4, 0);
s = lua_touserdata(T, 1);
if (!s->open)
return io_closed(T);
if (s->w.data != NULL)
return io_busy(T);
f = lua_touserdata(T, 2);
if (f->fd < 0) {
lua_pushnil(T);
lua_pushliteral(T, "file closed");
return 2;
}
s->w.data = T;
sf = lem_xmalloc(sizeof(struct sfhandle));
sf->T = T;
sf->s = s;
sf->size = size;
sf->offset = offset;
sf->fd = f->fd;
lem_async_do(&sf->a, stream_sendfile_work, stream_sendfile_reap);
lua_settop(T, 2);
return lua_yield(T, 2);
}
static int
db_open(lua_State *T)
{
const char *filename = luaL_checkstring(T, 1);
#if SQLITE_VERSION_NUMBER >= 3005000
int flags = luaL_optnumber(T, 2, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE);
#endif
struct db *db;
db = lem_xmalloc(sizeof(struct db));
db->T = T;
db->handle = NULL;
db->refs = 1;
db->req.open.filename = filename;
#if SQLITE_VERSION_NUMBER >= 3005000
db->req.open.flags = flags;
#endif
lem_async_do(&db->a, db_open_work, db_open_reap);
lua_settop(T, 1);
lua_pushvalue(T, lua_upvalueindex(1));
return lua_yield(T, 2);
}
static int
file_write(lua_State *T)
{
struct file *f;
const char *str;
size_t len;
int idx;
int i;
int top;
luaL_checktype(T, 1, LUA_TUSERDATA);
top = lua_gettop(T);
idx = 1;
do {
str = luaL_checklstring(T, ++idx, &len);
} while (len == 0 && idx < top);
for (i = idx+1; i <= top; i++)
(void)luaL_checkstring(T, i);
f = lua_touserdata(T, 1);
if (f->fd < 0)
return io_closed(T);
if (f->T != NULL)
return io_busy(T);
if (len == 0) {
lua_pushboolean(T, 1);
return 1;
}
f->T = T;
f->write.str = str;
f->write.len = len;
f->write.idx = idx;
lem_async_do(&f->a, file_write_work, file_write_reap);
return lua_yield(T, top);
}
/*
* file:lock() method
*/
static void
file_lock_work(struct lem_async *a)
{
struct file *f = (struct file *)a;
struct flock fl = {
.l_type = f->lock.type,
.l_whence = SEEK_SET,
.l_start = f->lock.start,
.l_len = f->lock.len,
};
if (fcntl(f->fd, F_SETLK, &fl) == -1)
f->ret = errno;
else
f->ret = 0;
}
static void
file_lock_reap(struct lem_async *a)
{
struct file *f = (struct file *)a;
lua_State *T = f->T;
f->T = NULL;
if (f->ret) {
lem_queue(T, io_strerror(T, f->ret));
return;
}
lua_pushboolean(T, 1);
lem_queue(T, 1);
}
static int
file_lock(lua_State *T)
{
static const short mode[] = { F_RDLCK, F_WRLCK, F_UNLCK };
static const char *const modenames[] = { "r", "w", "u", NULL };
struct file *f;
int op;
lua_Number start;
lua_Number len;
luaL_checktype(T, 1, LUA_TUSERDATA);
op = luaL_checkoption(T, 2, NULL, modenames);
start = luaL_optnumber(T, 3, 0);
len = luaL_optnumber(T, 4, 0);
f = lua_touserdata(T, 1);
f->lock.start = (off_t)start;
luaL_argcheck(T, (lua_Number)f->lock.start == start, 3,
"not an integer in proper range");
f->lock.len = (off_t)len;
luaL_argcheck(T, (lua_Number)f->lock.len == len, 4,
"not an integer in proper range");
if (f->fd < 0)
return io_closed(T);
if (f->T != NULL)
return io_busy(T);
f->T = T;
f->lock.type = mode[op];
lem_async_do(&f->a, file_lock_work, file_lock_reap);
lua_settop(T, 1);
return lua_yield(T, 1);
}
