/* Check first argument for a C type and returns its ID. */
static CTypeID ffi_checkctype(lua_State *L, CTState *cts, TValue *param)
{
TValue *o = L->base;
if (!(o < L->top)) {
err_argtype:
lj_err_argtype(L, 1, "C type");
}
if (tvisstr(o)) { /* Parse an abstract C type declaration. */
GCstr *s = strV(o);
CPState cp;
int errcode;
cp.L = L;
cp.cts = cts;
cp.srcname = strdata(s);
cp.p = strdata(s);
cp.param = param;
cp.mode = CPARSE_MODE_ABSTRACT|CPARSE_MODE_NOIMPLICIT;
errcode = lj_cparse(&cp);
if (errcode) lj_err_throw(L, errcode); /* Propagate errors. */
return cp.val.id;
} else {
GCcdata *cd;
if (!tviscdata(o)) goto err_argtype;
if (param && param < L->top) lj_err_arg(L, 1, LJ_ERR_FFI_NUMPARAM);
cd = cdataV(o);
return cd->ctypeid == CTID_CTYPEID ? *(CTypeID *)cdataptr(cd) : cd->ctypeid;
}
}
TValue *lj_lib_checkany(lua_State *L, int narg)
{
TValue *o = L->base + narg-1;
if (o >= L->top)
lj_err_arg(L, narg, LJ_ERR_NOVAL);
return o;
}
static int setjitmode(lua_State *L, int mode)
{
int idx = 0;
if (L->base == L->top || tvisnil(L->base)) { /* jit.on/off/flush([nil]) */
mode |= LUAJIT_MODE_ENGINE;
} else {
/* jit.on/off/flush(func|proto, nil|true|false) */
if (tvisfunc(L->base) || tvisproto(L->base))
idx = 1;
else if (!tvistrue(L->base)) /* jit.on/off/flush(true, nil|true|false) */
goto err;
if (L->base+1 < L->top && tvisbool(L->base+1))
mode |= boolV(L->base+1) ? LUAJIT_MODE_ALLFUNC : LUAJIT_MODE_ALLSUBFUNC;
else
mode |= LUAJIT_MODE_FUNC;
}
if (luaJIT_setmode(L, idx, mode) != 1) {
err:
#if LJ_HASJIT
lj_err_arg(L, 1, LJ_ERR_NOLFUNC);
#else
lj_err_caller(L, LJ_ERR_NOJIT);
#endif
}
return 0;
}
/* Convert argument to C pointer. */
static void *ffi_checkptr(lua_State *L, int narg, CTypeID id)
{
CTState *cts = ctype_cts(L);
TValue *o = L->base + narg-1;
void *p;
if (o >= L->top)
lj_err_arg(L, narg, LJ_ERR_NOVAL);
lj_cconv_ct_tv(cts, ctype_get(cts, id), (uint8_t *)&p, o, CCF_ARG(narg));
return p;
}
/* Convert argument to int32_t. */
static int32_t ffi_checkint(lua_State *L, int narg)
{
CTState *cts = ctype_cts(L);
TValue *o = L->base + narg-1;
int32_t i;
if (o >= L->top)
lj_err_arg(L, narg, LJ_ERR_NOVAL);
lj_cconv_ct_tv(cts, ctype_get(cts, CTID_INT32), (uint8_t *)&i, o,
CCF_ARG(narg));
return i;
}
GCtab *lj_lib_checktabornil(lua_State *L, int narg)
{
TValue *o = L->base + narg-1;
if (o < L->top) {
if (tvistab(o))
return tabV(o);
else if (tvisnil(o))
return NULL;
}
lj_err_arg(L, narg, LJ_ERR_NOTABN);
return NULL; /* unreachable */
}
static int io_file_read(lua_State *L, FILE *fp, int start)
{
int ok, n, nargs = cast_int(L->top - L->base) - start;
clearerr(fp);
if (nargs == 0) {
ok = io_file_readline(L, fp);
n = start+1; /* Return 1 result. */
} else {
/* The results plus the buffers go on top of the args. */
luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
ok = 1;
for (n = start; nargs-- && ok; n++) {
if (tvisstr(L->base+n)) {
const char *p = strVdata(L->base+n);
if (p[0] != '*')
lj_err_arg(L, n+1, LJ_ERR_INVOPT);
if (p[1] == 'n')
ok = io_file_readnum(L, fp);
else if (p[1] == 'l')
ok = io_file_readline(L, fp);
else if (p[1] == 'a')
io_file_readchars(L, fp, ~((size_t)0));
else
lj_err_arg(L, n+1, LJ_ERR_INVFMT);
} else if (tvisnum(L->base+n)) {
size_t len = (size_t)lj_lib_checkint(L, n+1);
ok = len ? io_file_readchars(L, fp, len) : io_file_testeof(L, fp);
} else {
lj_err_arg(L, n+1, LJ_ERR_INVOPT);
}
}
}
if (ferror(fp))
return io_pushresult(L, 0, NULL);
if (!ok)
setnilV(L->top-1); /* Replace last result with nil. */
return n - start;
}
