1 //===- FuzzerIO.cpp - IO utils. -------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 // IO functions.
10 //===----------------------------------------------------------------------===//
11
12 #include "FuzzerIO.h"
13 #include "FuzzerDefs.h"
14 #include "FuzzerExtFunctions.h"
15 #include <algorithm>
16 #include <cstdarg>
17 #include <fstream>
18 #include <iterator>
19 #include <sys/stat.h>
20 #include <sys/types.h>
21
22 namespace fuzzer {
23
24 static FILE *OutputFile = stderr;
25
GetEpoch(const std::string & Path)26 long GetEpoch(const std::string &Path) {
27 struct stat St;
28 if (stat(Path.c_str(), &St))
29 return 0; // Can't stat, be conservative.
30 return St.st_mtime;
31 }
32
FileToVector(const std::string & Path,size_t MaxSize,bool ExitOnError)33 Unit FileToVector(const std::string &Path, size_t MaxSize, bool ExitOnError) {
34 std::ifstream T(Path);
35 if (ExitOnError && !T) {
36 Printf("No such directory: %s; exiting\n", Path.c_str());
37 exit(1);
38 }
39
40 T.seekg(0, T.end);
41 size_t FileLen = T.tellg();
42 if (MaxSize)
43 FileLen = std::min(FileLen, MaxSize);
44
45 T.seekg(0, T.beg);
46 Unit Res(FileLen);
47 T.read(reinterpret_cast<char *>(Res.data()), FileLen);
48 return Res;
49 }
50
FileToString(const std::string & Path)51 std::string FileToString(const std::string &Path) {
52 std::ifstream T(Path);
53 return std::string((std::istreambuf_iterator<char>(T)),
54 std::istreambuf_iterator<char>());
55 }
56
CopyFileToErr(const std::string & Path)57 void CopyFileToErr(const std::string &Path) {
58 Printf("%s", FileToString(Path).c_str());
59 }
60
WriteToFile(const Unit & U,const std::string & Path)61 void WriteToFile(const Unit &U, const std::string &Path) {
62 // Use raw C interface because this function may be called from a sig handler.
63 FILE *Out = fopen(Path.c_str(), "w");
64 if (!Out) return;
65 fwrite(U.data(), sizeof(U[0]), U.size(), Out);
66 fclose(Out);
67 }
68
ReadDirToVectorOfUnits(const char * Path,std::vector<Unit> * V,long * Epoch,size_t MaxSize,bool ExitOnError)69 void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V,
70 long *Epoch, size_t MaxSize, bool ExitOnError) {
71 long E = Epoch ? *Epoch : 0;
72 std::vector<std::string> Files;
73 ListFilesInDirRecursive(Path, Epoch, &Files, /*TopDir*/true);
74 size_t NumLoaded = 0;
75 for (size_t i = 0; i < Files.size(); i++) {
76 auto &X = Files[i];
77 if (Epoch && GetEpoch(X) < E) continue;
78 NumLoaded++;
79 if ((NumLoaded & (NumLoaded - 1)) == 0 && NumLoaded >= 1024)
80 Printf("Loaded %zd/%zd files from %s\n", NumLoaded, Files.size(), Path);
81 auto S = FileToVector(X, MaxSize, ExitOnError);
82 if (!S.empty())
83 V->push_back(S);
84 }
85 }
86
DirPlusFile(const std::string & DirPath,const std::string & FileName)87 std::string DirPlusFile(const std::string &DirPath,
88 const std::string &FileName) {
89 return DirPath + GetSeparator() + FileName;
90 }
91
DupAndCloseStderr()92 void DupAndCloseStderr() {
93 int OutputFd = DuplicateFile(2);
94 if (OutputFd > 0) {
95 FILE *NewOutputFile = OpenFile(OutputFd, "w");
96 if (NewOutputFile) {
97 OutputFile = NewOutputFile;
98 if (EF->__sanitizer_set_report_fd)
99 EF->__sanitizer_set_report_fd(reinterpret_cast<void *>(OutputFd));
100 CloseFile(2);
101 }
102 }
103 }
104
CloseStdout()105 void CloseStdout() {
106 CloseFile(1);
107 }
108
Printf(const char * Fmt,...)109 void Printf(const char *Fmt, ...) {
110 va_list ap;
111 va_start(ap, Fmt);
112 vfprintf(OutputFile, Fmt, ap);
113 va_end(ap);
114 fflush(OutputFile);
115 }
116
117 } // namespace fuzzer
118