1 //===- FuzzerIO.cpp - IO utils. -------------------------------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 //===----------------------------------------------------------------------===//
11 #include "FuzzerDefs.h"
12 #include "FuzzerExtFunctions.h"
14 #include "FuzzerUtil.h"
20 #include <sys/types.h>
24 static FILE *OutputFile = stderr;
26 long GetEpoch(const std::string &Path) {
28 if (stat(Path.c_str(), &St))
29 return 0; // Can't stat, be conservative.
33 Unit FileToVector(const std::string &Path, size_t MaxSize, bool ExitOnError) {
34 std::ifstream T(Path, std::ios::binary);
35 if (ExitOnError && !T) {
36 Printf("No such directory: %s; exiting\n", Path.c_str());
41 auto EndPos = T.tellg();
42 if (EndPos < 0) return {};
43 size_t FileLen = EndPos;
45 FileLen = std::min(FileLen, MaxSize);
49 T.read(reinterpret_cast<char *>(Res.data()), FileLen);
53 std::string FileToString(const std::string &Path) {
54 std::ifstream T(Path, std::ios::binary);
55 return std::string((std::istreambuf_iterator<char>(T)),
56 std::istreambuf_iterator<char>());
59 void CopyFileToErr(const std::string &Path) {
60 Printf("%s", FileToString(Path).c_str());
63 void WriteToFile(const Unit &U, const std::string &Path) {
64 WriteToFile(U.data(), U.size(), Path);
67 void WriteToFile(const std::string &Data, const std::string &Path) {
68 WriteToFile(reinterpret_cast<const uint8_t *>(Data.c_str()), Data.size(),
72 void WriteToFile(const uint8_t *Data, size_t Size, const std::string &Path) {
73 // Use raw C interface because this function may be called from a sig handler.
74 FILE *Out = fopen(Path.c_str(), "wb");
76 fwrite(Data, sizeof(Data[0]), Size, Out);
80 void ReadDirToVectorOfUnits(const char *Path, Vector<Unit> *V,
81 long *Epoch, size_t MaxSize, bool ExitOnError) {
82 long E = Epoch ? *Epoch : 0;
83 Vector<std::string> Files;
84 ListFilesInDirRecursive(Path, Epoch, &Files, /*TopDir*/true);
86 for (size_t i = 0; i < Files.size(); i++) {
88 if (Epoch && GetEpoch(X) < E) continue;
90 if ((NumLoaded & (NumLoaded - 1)) == 0 && NumLoaded >= 1024)
91 Printf("Loaded %zd/%zd files from %s\n", NumLoaded, Files.size(), Path);
92 auto S = FileToVector(X, MaxSize, ExitOnError);
99 void GetSizedFilesFromDir(const std::string &Dir, Vector<SizedFile> *V) {
100 Vector<std::string> Files;
101 ListFilesInDirRecursive(Dir, 0, &Files, /*TopDir*/true);
102 for (auto &File : Files)
103 if (size_t Size = FileSize(File))
104 V->push_back({File, Size});
107 std::string DirPlusFile(const std::string &DirPath,
108 const std::string &FileName) {
109 return DirPath + GetSeparator() + FileName;
112 void DupAndCloseStderr() {
113 int OutputFd = DuplicateFile(2);
115 FILE *NewOutputFile = OpenFile(OutputFd, "w");
117 OutputFile = NewOutputFile;
118 if (EF->__sanitizer_set_report_fd)
119 EF->__sanitizer_set_report_fd(
120 reinterpret_cast<void *>(GetHandleFromFd(OutputFd)));
130 void Printf(const char *Fmt, ...) {
133 vfprintf(OutputFile, Fmt, ap);
138 void VPrintf(bool Verbose, const char *Fmt, ...) {
139 if (!Verbose) return;
142 vfprintf(OutputFile, Fmt, ap);
147 void RmDirRecursive(const std::string &Dir) {
149 Dir, [](const std::string &Path) {},
150 [](const std::string &Path) { RmDir(Path); },
151 [](const std::string &Path) { RemoveFile(Path); });
154 std::string TempPath(const char *Extension) {
155 return DirPlusFile(TmpDir(),
156 "libFuzzerTemp." + std::to_string(GetPid()) + Extension);
159 } // namespace fuzzer