1 /*
2 * Copyright (c) 2021 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15 #include "lseek.h"
16 #include <cstring>
17 #include <tuple>
18 #include <unistd.h>
19
20 #include "../../common/napi/n_async/n_async_work_callback.h"
21 #include "../../common/napi/n_async/n_async_work_promise.h"
22 #include "../../common/napi/n_func_arg.h"
23 namespace OHOS {
24 namespace DistributedFS {
25 namespace ModuleFileIO {
26 using namespace std;
27
GetLseekArg(napi_env env,const NFuncArg & funcArg)28 static tuple<bool, int, int, int> GetLseekArg(napi_env env, const NFuncArg &funcArg)
29 {
30 auto [resGetFirstArg, fd] = NVal(env, funcArg[NARG_POS::FIRST]).ToInt32();
31 if (!resGetFirstArg) {
32 UniError(EINVAL).ThrowErr(env, "Invalid fd");
33 return { false, -1, -1, -1 };
34 }
35
36 auto [resGetSecondArg, offset] = NVal(env, funcArg[NARG_POS::SECOND]).ToInt32();
37 if (!resGetSecondArg) {
38 UniError(EINVAL).ThrowErr(env, "Invalid offset");
39 return { false, -1, -1, -1 };
40 }
41
42 auto [resGetThirdArg, whence] = NVal(env, funcArg[NARG_POS::THIRD]).ToInt32();
43 if (!resGetThirdArg) {
44 UniError(EINVAL).ThrowErr(env, "Invalid whence");
45 return { false, -1, -1, -1 };
46 }
47
48 return { true, fd, offset, whence };
49 }
50
Sync(napi_env env,napi_callback_info info)51 napi_value Lseek::Sync(napi_env env, napi_callback_info info)
52 {
53 NFuncArg funcArg(env, info);
54 if (!funcArg.InitArgs(NARG_CNT::THREE)) {
55 UniError(EINVAL).ThrowErr(env, "Number of arguments unmatched");
56 return nullptr;
57 }
58
59 auto [resGetLseekArg, fd, offset, whence] = GetLseekArg(env, funcArg);
60 if (!resGetLseekArg) {
61 return nullptr;
62 }
63
64 int ret = lseek(fd, offset, whence);
65 if (ret == -1) {
66 UniError(errno).ThrowErr(env);
67 return nullptr;
68 }
69
70 return NVal::CreateInt64(env, ret).val_;
71 }
72
Async(napi_env env,napi_callback_info info)73 napi_value Lseek::Async(napi_env env, napi_callback_info info)
74 {
75 NFuncArg funcArg(env, info);
76 if (!funcArg.InitArgs(NARG_CNT::THREE, NARG_CNT::FOUR)) {
77 UniError(EINVAL).ThrowErr(env, "Number of arguments unmatched");
78 return nullptr;
79 }
80
81 auto [resGetLseekArg, fd, offset, whence] = GetLseekArg(env, funcArg);
82 if (!resGetLseekArg) {
83 return nullptr;
84 }
85
86 auto arg = make_shared<int32_t>();
87 auto cbExec = [fd = fd, offset = offset, whence = whence, arg](napi_env env) -> UniError {
88 int ret = lseek(fd, offset, whence);
89 *arg = ret;
90 if (ret == -1) {
91 return UniError(errno);
92 } else {
93 return UniError(ERRNO_NOERR);
94 }
95 };
96
97 auto cbComplCallback = [arg](napi_env env, UniError err) -> NVal {
98 if (err) {
99 return { env, err.GetNapiErr(env) };
100 }
101 return { NVal::CreateInt64(env, *arg) };
102 };
103
104 size_t argc = funcArg.GetArgc();
105 const string procedureName = "FileIOLseek";
106 NVal thisVar(env, funcArg.GetThisVar());
107 if (argc == NARG_CNT::THREE) {
108 return NAsyncWorkPromise(env, thisVar).Schedule(procedureName, cbExec, cbComplCallback).val_;
109 } else {
110 NVal cb(env, funcArg[NARG_POS::FOURTH]);
111 return NAsyncWorkCallback(env, thisVar, cb).Schedule(procedureName, cbExec, cbComplCallback).val_;
112 }
113 }
114 } // namespace ModuleFileIO
115 } // namespace DistributedFS
116 } // namespace OHOS