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node_file.cc
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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#include "node.h"
#include "node_file.h"
#include "node_buffer.h"
#include "node_internals.h"
#include "node_stat_watcher.h"
#include "env.h"
#include "env-inl.h"
#include "req_wrap.h"
#include "string_bytes.h"
#include "util.h"
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#if defined(__MINGW32__) || defined(_MSC_VER)
# include <io.h>
#endif
namespace node {
using v8::Array;
using v8::Context;
using v8::EscapableHandleScope;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::Handle;
using v8::HandleScope;
using v8::Integer;
using v8::Local;
using v8::Number;
using v8::Object;
using v8::String;
using v8::Value;
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define TYPE_ERROR(msg) env->ThrowTypeError(msg)
#define THROW_BAD_ARGS TYPE_ERROR("Bad argument")
class FSReqWrap: public ReqWrap<uv_fs_t> {
public:
void* operator new(size_t size) { return new char[size]; }
void* operator new(size_t size, char* storage) { return storage; }
FSReqWrap(Environment* env,
Local<Object> req,
const char* syscall,
char* data = nullptr)
: ReqWrap(env, req, AsyncWrap::PROVIDER_FSREQWRAP),
syscall_(syscall),
data_(data),
dest_len_(0) {
Wrap(object(), this);
}
void ReleaseEarly() {
if (data_ == nullptr)
return;
delete[] data_;
data_ = nullptr;
}
inline const char* syscall() const { return syscall_; }
inline const char* dest() const { return dest_; }
inline unsigned int dest_len() const { return dest_len_; }
inline void dest_len(unsigned int dest_len) { dest_len_ = dest_len; }
private:
const char* syscall_;
char* data_;
unsigned int dest_len_;
char dest_[1];
};
static void NewFSReqWrap(const FunctionCallbackInfo<Value>& args) {
CHECK(args.IsConstructCall());
}
#define ASSERT_OFFSET(a) \
if (!(a)->IsUndefined() && !(a)->IsNull() && !IsInt64((a)->NumberValue())) { \
return env->ThrowTypeError("Not an integer"); \
}
#define ASSERT_TRUNCATE_LENGTH(a) \
if (!(a)->IsUndefined() && !(a)->IsNull() && !IsInt64((a)->NumberValue())) { \
return env->ThrowTypeError("Not an integer"); \
}
#define GET_OFFSET(a) ((a)->IsNumber() ? (a)->IntegerValue() : -1)
#define GET_TRUNCATE_LENGTH(a) ((a)->IntegerValue())
static inline bool IsInt64(double x) {
return x == static_cast<double>(static_cast<int64_t>(x));
}
static void After(uv_fs_t *req) {
FSReqWrap* req_wrap = static_cast<FSReqWrap*>(req->data);
CHECK_EQ(&req_wrap->req_, req);
req_wrap->ReleaseEarly(); // Free memory that's no longer used now.
Environment* env = req_wrap->env();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
// there is always at least one argument. "error"
int argc = 1;
// Allocate space for two args. We may only use one depending on the case.
// (Feel free to increase this if you need more)
Local<Value> argv[2];
if (req->result < 0) {
// If the request doesn't have a path parameter set.
if (req->path == nullptr) {
argv[0] = UVException(req->result, nullptr, req_wrap->syscall());
} else if ((req->result == UV_EEXIST ||
req->result == UV_ENOTEMPTY ||
req->result == UV_EPERM) &&
req_wrap->dest_len() > 0) {
argv[0] = UVException(req->result,
nullptr,
req_wrap->syscall(),
req_wrap->dest());
} else {
argv[0] = UVException(req->result,
nullptr,
req_wrap->syscall(),
static_cast<const char*>(req->path));
}
} else {
// error value is empty or null for non-error.
argv[0] = Null(env->isolate());
// All have at least two args now.
argc = 2;
switch (req->fs_type) {
// These all have no data to pass.
case UV_FS_ACCESS:
case UV_FS_CLOSE:
case UV_FS_RENAME:
case UV_FS_UNLINK:
case UV_FS_RMDIR:
case UV_FS_MKDIR:
case UV_FS_FTRUNCATE:
case UV_FS_FSYNC:
case UV_FS_FDATASYNC:
case UV_FS_LINK:
case UV_FS_SYMLINK:
case UV_FS_CHMOD:
case UV_FS_FCHMOD:
case UV_FS_CHOWN:
case UV_FS_FCHOWN:
// These, however, don't.
argc = 1;
break;
case UV_FS_UTIME:
case UV_FS_FUTIME:
argc = 0;
break;
case UV_FS_OPEN:
argv[1] = Integer::New(env->isolate(), req->result);
break;
case UV_FS_WRITE:
argv[1] = Integer::New(env->isolate(), req->result);
break;
case UV_FS_STAT:
case UV_FS_LSTAT:
case UV_FS_FSTAT:
argv[1] = BuildStatsObject(env,
static_cast<const uv_stat_t*>(req->ptr));
break;
case UV_FS_READLINK:
argv[1] = String::NewFromUtf8(env->isolate(),
static_cast<const char*>(req->ptr));
break;
case UV_FS_READ:
// Buffer interface
argv[1] = Integer::New(env->isolate(), req->result);
break;
case UV_FS_SCANDIR:
{
int r;
Local<Array> names = Array::New(env->isolate(), 0);
for (int i = 0; ; i++) {
uv_dirent_t ent;
r = uv_fs_scandir_next(req, &ent);
if (r == UV_EOF)
break;
if (r != 0) {
argv[0] = UVException(r,
nullptr,
req_wrap->syscall(),
static_cast<const char*>(req->path));
break;
}
Local<String> name = String::NewFromUtf8(env->isolate(),
ent.name);
names->Set(i, name);
}
argv[1] = names;
}
break;
default:
CHECK(0 && "Unhandled eio response");
}
}
req_wrap->MakeCallback(env->oncomplete_string(), argc, argv);
uv_fs_req_cleanup(&req_wrap->req_);
delete req_wrap;
}
// This struct is only used on sync fs calls.
// For async calls FSReqWrap is used.
struct fs_req_wrap {
fs_req_wrap() {}
~fs_req_wrap() { uv_fs_req_cleanup(&req); }
uv_fs_t req;
DISALLOW_COPY_AND_ASSIGN(fs_req_wrap);
};
#define ASYNC_DEST_CALL(func, req, dest_path, ...) \
Environment* env = Environment::GetCurrent(args); \
FSReqWrap* req_wrap; \
char* dest_str = (dest_path); \
int dest_len = dest_str == nullptr ? 0 : strlen(dest_str); \
char* storage = new char[sizeof(*req_wrap) + dest_len]; \
CHECK(req->IsObject()); \
req_wrap = new(storage) FSReqWrap(env, req.As<Object>(), #func); \
req_wrap->dest_len(dest_len); \
if (dest_str != nullptr) { \
memcpy(const_cast<char*>(req_wrap->dest()), \
dest_str, \
dest_len + 1); \
} \
int err = uv_fs_ ## func(env->event_loop(), \
&req_wrap->req_, \
__VA_ARGS__, \
After); \
req_wrap->Dispatched(); \
if (err < 0) { \
uv_fs_t* uv_req = &req_wrap->req_; \
uv_req->result = err; \
uv_req->path = nullptr; \
After(uv_req); \
} \
args.GetReturnValue().Set(req_wrap->persistent());
#define ASYNC_CALL(func, req, ...) \
ASYNC_DEST_CALL(func, req, nullptr, __VA_ARGS__) \
#define SYNC_DEST_CALL(func, path, dest, ...) \
fs_req_wrap req_wrap; \
int err = uv_fs_ ## func(env->event_loop(), \
&req_wrap.req, \
__VA_ARGS__, \
nullptr); \
if (err < 0) { \
if (dest != nullptr && \
(err == UV_EEXIST || \
err == UV_ENOTEMPTY || \
err == UV_EPERM)) { \
return env->ThrowUVException(err, #func, "", dest); \
} else { \
return env->ThrowUVException(err, #func, "", path); \
} \
} \
#define SYNC_CALL(func, path, ...) \
SYNC_DEST_CALL(func, path, nullptr, __VA_ARGS__) \
#define SYNC_REQ req_wrap.req
#define SYNC_RESULT err
static void Access(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args.GetIsolate());
HandleScope scope(env->isolate());
if (args.Length() < 2)
return THROW_BAD_ARGS;
if (!args[0]->IsString())
return TYPE_ERROR("path must be a string");
if (!args[1]->IsInt32())
return TYPE_ERROR("mode must be an integer");
node::Utf8Value path(env->isolate(), args[0]);
int mode = static_cast<int>(args[1]->Int32Value());
if (args[2]->IsObject()) {
ASYNC_CALL(access, args[2], *path, mode);
} else {
SYNC_CALL(access, *path, *path, mode);
}
}
static void Close(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1 || !args[0]->IsInt32()) {
return THROW_BAD_ARGS;
}
int fd = args[0]->Int32Value();
if (args[1]->IsObject()) {
ASYNC_CALL(close, args[1], fd)
} else {
SYNC_CALL(close, 0, fd)
}
}
Local<Value> BuildStatsObject(Environment* env, const uv_stat_t* s) {
// If you hit this assertion, you forgot to enter the v8::Context first.
CHECK_EQ(env->context(), env->isolate()->GetCurrentContext());
EscapableHandleScope handle_scope(env->isolate());
// The code below is very nasty-looking but it prevents a segmentation fault
// when people run JS code like the snippet below. It's apparently more
// common than you would expect, several people have reported this crash...
//
// function crash() {
// fs.statSync('.');
// crash();
// }
//
// We need to check the return value of Integer::New() and Date::New()
// and make sure that we bail out when V8 returns an empty handle.
// Integers.
#define X(name) \
Local<Value> name = Integer::New(env->isolate(), s->st_##name); \
if (name.IsEmpty()) \
return handle_scope.Escape(Local<Object>()); \
X(dev)
X(mode)
X(nlink)
X(uid)
X(gid)
X(rdev)
# if defined(__POSIX__)
X(blksize)
# else
Local<Value> blksize = Undefined(env->isolate());
# endif
#undef X
// Numbers.
#define X(name) \
Local<Value> name = Number::New(env->isolate(), \
static_cast<double>(s->st_##name)); \
if (name.IsEmpty()) \
return handle_scope.Escape(Local<Object>()); \
X(ino)
X(size)
# if defined(__POSIX__)
X(blocks)
# else
Local<Value> blocks = Undefined(env->isolate());
# endif
#undef X
// Dates.
#define X(name) \
Local<Value> name##_msec = \
Number::New(env->isolate(), \
(static_cast<double>(s->st_##name.tv_sec) * 1000) + \
(static_cast<double>(s->st_##name.tv_nsec / 1000000))); \
\
if (name##_msec.IsEmpty()) \
return handle_scope.Escape(Local<Object>()); \
X(atim)
X(mtim)
X(ctim)
X(birthtim)
#undef X
// Pass stats as the first argument, this is the object we are modifying.
Local<Value> argv[] = {
dev,
mode,
nlink,
uid,
gid,
rdev,
blksize,
ino,
size,
blocks,
atim_msec,
mtim_msec,
ctim_msec,
birthtim_msec
};
// Call out to JavaScript to create the stats object.
Local<Value> stats =
env->fs_stats_constructor_function()->NewInstance(ARRAY_SIZE(argv), argv);
if (stats.IsEmpty())
return handle_scope.Escape(Local<Object>());
return handle_scope.Escape(stats);
}
static void Stat(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return TYPE_ERROR("path required");
if (!args[0]->IsString())
return TYPE_ERROR("path must be a string");
node::Utf8Value path(env->isolate(), args[0]);
if (args[1]->IsObject()) {
ASYNC_CALL(stat, args[1], *path)
} else {
SYNC_CALL(stat, *path, *path)
args.GetReturnValue().Set(
BuildStatsObject(env, static_cast<const uv_stat_t*>(SYNC_REQ.ptr)));
}
}
static void LStat(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return TYPE_ERROR("path required");
if (!args[0]->IsString())
return TYPE_ERROR("path must be a string");
node::Utf8Value path(env->isolate(), args[0]);
if (args[1]->IsObject()) {
ASYNC_CALL(lstat, args[1], *path)
} else {
SYNC_CALL(lstat, *path, *path)
args.GetReturnValue().Set(
BuildStatsObject(env, static_cast<const uv_stat_t*>(SYNC_REQ.ptr)));
}
}
static void FStat(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1 || !args[0]->IsInt32()) {
return THROW_BAD_ARGS;
}
int fd = args[0]->Int32Value();
if (args[1]->IsObject()) {
ASYNC_CALL(fstat, args[1], fd)
} else {
SYNC_CALL(fstat, 0, fd)
args.GetReturnValue().Set(
BuildStatsObject(env, static_cast<const uv_stat_t*>(SYNC_REQ.ptr)));
}
}
static void Symlink(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
int len = args.Length();
if (len < 1)
return TYPE_ERROR("dest path required");
if (len < 2)
return TYPE_ERROR("src path required");
if (!args[0]->IsString())
return TYPE_ERROR("dest path must be a string");
if (!args[1]->IsString())
return TYPE_ERROR("src path must be a string");
node::Utf8Value dest(env->isolate(), args[0]);
node::Utf8Value path(env->isolate(), args[1]);
int flags = 0;
if (args[2]->IsString()) {
node::Utf8Value mode(env->isolate(), args[2]);
if (strcmp(*mode, "dir") == 0) {
flags |= UV_FS_SYMLINK_DIR;
} else if (strcmp(*mode, "junction") == 0) {
flags |= UV_FS_SYMLINK_JUNCTION;
} else if (strcmp(*mode, "file") != 0) {
return env->ThrowError("Unknown symlink type");
}
}
if (args[3]->IsObject()) {
ASYNC_DEST_CALL(symlink, args[3], *path, *dest, *path, flags)
} else {
SYNC_DEST_CALL(symlink, *dest, *path, *dest, *path, flags)
}
}
static void Link(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
int len = args.Length();
if (len < 1)
return TYPE_ERROR("dest path required");
if (len < 2)
return TYPE_ERROR("src path required");
if (!args[0]->IsString())
return TYPE_ERROR("dest path must be a string");
if (!args[1]->IsString())
return TYPE_ERROR("src path must be a string");
node::Utf8Value orig_path(env->isolate(), args[0]);
node::Utf8Value new_path(env->isolate(), args[1]);
if (args[2]->IsObject()) {
ASYNC_DEST_CALL(link, args[2], *new_path, *orig_path, *new_path)
} else {
SYNC_DEST_CALL(link, *orig_path, *new_path, *orig_path, *new_path)
}
}
static void ReadLink(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return TYPE_ERROR("path required");
if (!args[0]->IsString())
return TYPE_ERROR("path must be a string");
node::Utf8Value path(env->isolate(), args[0]);
if (args[1]->IsObject()) {
ASYNC_CALL(readlink, args[1], *path)
} else {
SYNC_CALL(readlink, *path, *path)
const char* link_path = static_cast<const char*>(SYNC_REQ.ptr);
Local<String> rc = String::NewFromUtf8(env->isolate(), link_path);
args.GetReturnValue().Set(rc);
}
}
static void Rename(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
int len = args.Length();
if (len < 1)
return TYPE_ERROR("old path required");
if (len < 2)
return TYPE_ERROR("new path required");
if (!args[0]->IsString())
return TYPE_ERROR("old path must be a string");
if (!args[1]->IsString())
return TYPE_ERROR("new path must be a string");
node::Utf8Value old_path(env->isolate(), args[0]);
node::Utf8Value new_path(env->isolate(), args[1]);
if (args[2]->IsObject()) {
ASYNC_DEST_CALL(rename, args[2], *new_path, *old_path, *new_path)
} else {
SYNC_DEST_CALL(rename, *old_path, *new_path, *old_path, *new_path)
}
}
static void FTruncate(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 2 || !args[0]->IsInt32()) {
return THROW_BAD_ARGS;
}
int fd = args[0]->Int32Value();
ASSERT_TRUNCATE_LENGTH(args[1]);
int64_t len = GET_TRUNCATE_LENGTH(args[1]);
if (args[2]->IsObject()) {
ASYNC_CALL(ftruncate, args[2], fd, len)
} else {
SYNC_CALL(ftruncate, 0, fd, len)
}
}
static void Fdatasync(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1 || !args[0]->IsInt32()) {
return THROW_BAD_ARGS;
}
int fd = args[0]->Int32Value();
if (args[1]->IsObject()) {
ASYNC_CALL(fdatasync, args[1], fd)
} else {
SYNC_CALL(fdatasync, 0, fd)
}
}
static void Fsync(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1 || !args[0]->IsInt32()) {
return THROW_BAD_ARGS;
}
int fd = args[0]->Int32Value();
if (args[1]->IsObject()) {
ASYNC_CALL(fsync, args[1], fd)
} else {
SYNC_CALL(fsync, 0, fd)
}
}
static void Unlink(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return TYPE_ERROR("path required");
if (!args[0]->IsString())
return TYPE_ERROR("path must be a string");
node::Utf8Value path(env->isolate(), args[0]);
if (args[1]->IsObject()) {
ASYNC_CALL(unlink, args[1], *path)
} else {
SYNC_CALL(unlink, *path, *path)
}
}
static void RMDir(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return TYPE_ERROR("path required");
if (!args[0]->IsString())
return TYPE_ERROR("path must be a string");
node::Utf8Value path(env->isolate(), args[0]);
if (args[1]->IsObject()) {
ASYNC_CALL(rmdir, args[1], *path)
} else {
SYNC_CALL(rmdir, *path, *path)
}
}
static void MKDir(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 2 || !args[0]->IsString() || !args[1]->IsInt32()) {
return THROW_BAD_ARGS;
}
node::Utf8Value path(env->isolate(), args[0]);
int mode = static_cast<int>(args[1]->Int32Value());
if (args[2]->IsObject()) {
ASYNC_CALL(mkdir, args[2], *path, mode)
} else {
SYNC_CALL(mkdir, *path, *path, mode)
}
}
static void ReadDir(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return TYPE_ERROR("path required");
if (!args[0]->IsString())
return TYPE_ERROR("path must be a string");
node::Utf8Value path(env->isolate(), args[0]);
if (args[1]->IsObject()) {
ASYNC_CALL(scandir, args[1], *path, 0 /*flags*/)
} else {
SYNC_CALL(scandir, *path, *path, 0 /*flags*/)
CHECK_GE(SYNC_REQ.result, 0);
int r;
Local<Array> names = Array::New(env->isolate(), 0);
for (int i = 0; ; i++) {
uv_dirent_t ent;
r = uv_fs_scandir_next(&SYNC_REQ, &ent);
if (r == UV_EOF)
break;
if (r != 0)
return env->ThrowUVException(r, "readdir", "", *path);
Local<String> name = String::NewFromUtf8(env->isolate(),
ent.name);
names->Set(i, name);
}
args.GetReturnValue().Set(names);
}
}
static void Open(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
int len = args.Length();
if (len < 1)
return TYPE_ERROR("path required");
if (len < 2)
return TYPE_ERROR("flags required");
if (len < 3)
return TYPE_ERROR("mode required");
if (!args[0]->IsString())
return TYPE_ERROR("path must be a string");
if (!args[1]->IsInt32())
return TYPE_ERROR("flags must be an int");
if (!args[2]->IsInt32())
return TYPE_ERROR("mode must be an int");
node::Utf8Value path(env->isolate(), args[0]);
int flags = args[1]->Int32Value();
int mode = static_cast<int>(args[2]->Int32Value());
if (args[3]->IsObject()) {
ASYNC_CALL(open, args[3], *path, flags, mode)
} else {
SYNC_CALL(open, *path, *path, flags, mode)
args.GetReturnValue().Set(SYNC_RESULT);
}
}
// Wrapper for write(2).
//
// bytesWritten = write(fd, buffer, offset, length, position, callback)
// 0 fd integer. file descriptor
// 1 buffer the data to write
// 2 offset where in the buffer to start from
// 3 length how much to write
// 4 position if integer, position to write at in the file.
// if null, write from the current position
static void WriteBuffer(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK(args[0]->IsInt32());
CHECK(Buffer::HasInstance(args[1]));
int fd = args[0]->Int32Value();
Local<Object> obj = args[1].As<Object>();
const char* buf = Buffer::Data(obj);
size_t buffer_length = Buffer::Length(obj);
size_t off = args[2]->Uint32Value();
size_t len = args[3]->Uint32Value();
int64_t pos = GET_OFFSET(args[4]);
Local<Value> req = args[5];
if (off > buffer_length)
return env->ThrowRangeError("offset out of bounds");
if (len > buffer_length)
return env->ThrowRangeError("length out of bounds");
if (off + len < off)
return env->ThrowRangeError("off + len overflow");
if (!Buffer::IsWithinBounds(off, len, buffer_length))
return env->ThrowRangeError("off + len > buffer.length");
buf += off;
uv_buf_t uvbuf = uv_buf_init(const_cast<char*>(buf), len);
if (req->IsObject()) {
ASYNC_CALL(write, req, fd, &uvbuf, 1, pos)
return;
}
SYNC_CALL(write, nullptr, fd, &uvbuf, 1, pos)
args.GetReturnValue().Set(SYNC_RESULT);
}
// Wrapper for write(2).
//
// bytesWritten = write(fd, string, position, enc, callback)
// 0 fd integer. file descriptor
// 1 string non-buffer values are converted to strings
// 2 position if integer, position to write at in the file.
// if null, write from the current position
// 3 enc encoding of string
static void WriteString(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (!args[0]->IsInt32())
return env->ThrowTypeError("First argument must be file descriptor");
Local<Value> req;
Local<Value> string = args[1];
int fd = args[0]->Int32Value();
char* buf = nullptr;
int64_t pos;
size_t len;
bool must_free = false;
// will assign buf and len if string was external
if (!StringBytes::GetExternalParts(env->isolate(),
string,
const_cast<const char**>(&buf),
&len)) {
enum encoding enc = ParseEncoding(env->isolate(), args[3], UTF8);
len = StringBytes::StorageSize(env->isolate(), string, enc);
buf = new char[len];
// StorageSize may return too large a char, so correct the actual length
// by the write size
len = StringBytes::Write(env->isolate(), buf, len, args[1], enc);
must_free = true;
}
pos = GET_OFFSET(args[2]);
req = args[4];
uv_buf_t uvbuf = uv_buf_init(const_cast<char*>(buf), len);
if (!req->IsObject()) {
SYNC_CALL(write, nullptr, fd, &uvbuf, 1, pos)
if (must_free)
delete[] buf;
return args.GetReturnValue().Set(SYNC_RESULT);
}
FSReqWrap* req_wrap =
new FSReqWrap(env, req.As<Object>(), "write", must_free ? buf : nullptr);
int err = uv_fs_write(env->event_loop(),
&req_wrap->req_,
fd,
&uvbuf,
1,
pos,
After);
req_wrap->Dispatched();
if (err < 0) {
uv_fs_t* uv_req = &req_wrap->req_;
uv_req->result = err;
uv_req->path = nullptr;
After(uv_req);
}
return args.GetReturnValue().Set(req_wrap->persistent());
}
/*
* Wrapper for read(2).
*
* bytesRead = fs.read(fd, buffer, offset, length, position)
*
* 0 fd integer. file descriptor
* 1 buffer instance of Buffer
* 2 offset integer. offset to start reading into inside buffer
* 3 length integer. length to read
* 4 position file position - null for current position
*
*/
static void Read(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 2 || !args[0]->IsInt32()) {
return THROW_BAD_ARGS;
}
int fd = args[0]->Int32Value();
Local<Value> req;
size_t len;
int64_t pos;
char * buf = nullptr;
if (!Buffer::HasInstance(args[1])) {
return env->ThrowError("Second argument needs to be a buffer");
}
Local<Object> buffer_obj = args[1]->ToObject(env->isolate());
char *buffer_data = Buffer::Data(buffer_obj);
size_t buffer_length = Buffer::Length(buffer_obj);
size_t off = args[2]->Int32Value();
if (off >= buffer_length) {
return env->ThrowError("Offset is out of bounds");
}
len = args[3]->Int32Value();
if (!Buffer::IsWithinBounds(off, len, buffer_length))
return env->ThrowRangeError("Length extends beyond buffer");
pos = GET_OFFSET(args[4]);
buf = buffer_data + off;
uv_buf_t uvbuf = uv_buf_init(const_cast<char*>(buf), len);
req = args[5];
if (req->IsObject()) {
ASYNC_CALL(read, req, fd, &uvbuf, 1, pos);
} else {
SYNC_CALL(read, 0, fd, &uvbuf, 1, pos)
args.GetReturnValue().Set(SYNC_RESULT);
}
}
/* fs.chmod(path, mode);
* Wrapper for chmod(1) / EIO_CHMOD
*/
static void Chmod(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 2 || !args[0]->IsString() || !args[1]->IsInt32()) {
return THROW_BAD_ARGS;
}
node::Utf8Value path(env->isolate(), args[0]);
int mode = static_cast<int>(args[1]->Int32Value());
if (args[2]->IsObject()) {
ASYNC_CALL(chmod, args[2], *path, mode);
} else {
SYNC_CALL(chmod, *path, *path, mode);
}
}
/* fs.fchmod(fd, mode);
* Wrapper for fchmod(1) / EIO_FCHMOD
*/
static void FChmod(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 2 || !args[0]->IsInt32() || !args[1]->IsInt32()) {
return THROW_BAD_ARGS;
}
int fd = args[0]->Int32Value();
int mode = static_cast<int>(args[1]->Int32Value());
if (args[2]->IsObject()) {
ASYNC_CALL(fchmod, args[2], fd, mode);
} else {
SYNC_CALL(fchmod, 0, fd, mode);
}
}
/* fs.chown(path, uid, gid);