//===- FuzzerIOPosix.cpp - IO utils for Posix. ----------------------------===//

//

//                     The LLVM Compiler Infrastructure

//

// This file is distributed under the University of Illinois Open Source

// License. See LICENSE.TXT for details.

//

//===----------------------------------------------------------------------===//

// IO functions implementation using Posix API.

//===----------------------------------------------------------------------===//

#include "FuzzerDefs.h"

#if LIBFUZZER_POSIX || LIBFUZZER_FUCHSIA

#include "FuzzerExtFunctions.h"

#include "FuzzerIO.h"

#include <cstdarg>

#include <cstdio>

#include <dirent.h>

#include <fstream>

#include <iterator>

#include <libgen.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <unistd.h>

namespace fuzzer {

bool IsFile(const std::string &Path) {

  struct stat St;

  if (stat(Path.c_str(), &St))

    return false;

  return S_ISREG(St.st_mode);

}

static bool IsDirectory(const std::string &Path) {

  struct stat St;

  if (stat(Path.c_str(), &St))

    return false;

  return S_ISDIR(St.st_mode);

}

size_t FileSize(const std::string &Path) {

  struct stat St;

  if (stat(Path.c_str(), &St))

    return 0;

  return St.st_size;

}

std::string Basename(const std::string &Path) {

  size_t Pos = Path.rfind(GetSeparator());

  if (Pos == std::string::npos) return Path;

  assert(Pos < Path.size());

  return Path.substr(Pos + 1);

}

void ListFilesInDirRecursive(const std::string &Dir, long *Epoch,

                             Vector<std::string> *V, bool TopDir) {

  auto E = GetEpoch(Dir);

  if (Epoch)

    if (E && *Epoch >= E) return;

  DIR *D = opendir(Dir.c_str());

  if (!D) {

    Printf("%s: %s; exiting\n", strerror(errno), Dir.c_str());

    exit(1);

  }

  while (auto E = readdir(D)) {

    std::string Path = DirPlusFile(Dir, E->d_name);

    if (E->d_type == DT_REG || E->d_type == DT_LNK ||

        (E->d_type == DT_UNKNOWN && IsFile(Path)))

      V->push_back(Path);

    else if ((E->d_type == DT_DIR ||

             (E->d_type == DT_UNKNOWN && IsDirectory(Path))) &&

             *E->d_name != '.')

      ListFilesInDirRecursive(Path, Epoch, V, false);

  }

  closedir(D);

  if (Epoch && TopDir)

    *Epoch = E;

}

char GetSeparator() {

  return '/';

}

FILE* OpenFile(int Fd, const char* Mode) {

  return fdopen(Fd, Mode);

}

int CloseFile(int fd) {

  return close(fd);

}

int DuplicateFile(int Fd) {

  return dup(Fd);

}

void RemoveFile(const std::string &Path) {

  unlink(Path.c_str());

}

void DiscardOutput(int Fd) {

  FILE* Temp = fopen("/dev/null", "w");

  if (!Temp)

    return;

  dup2(fileno(Temp), Fd);

  fclose(Temp);

}

intptr_t GetHandleFromFd(int fd) {

  return static_cast<intptr_t>(fd);

}

std::string DirName(const std::string &FileName) {

  char *Tmp = new char[FileName.size() + 1];

  memcpy(Tmp, FileName.c_str(), FileName.size() + 1);

  std::string Res = dirname(Tmp);

  delete [] Tmp;

  return Res;

}

std::string TmpDir() {

  if (auto Env = getenv("TMPDIR"))

    return Env;

  return "/tmp";

}

bool IsInterestingCoverageFile(const std::string &FileName) {

  if (FileName.find("compiler-rt/lib/") != std::string::npos)

    return false; // sanitizer internal.

  if (FileName.find("/usr/lib/") != std::string::npos)

    return false;

  if (FileName.find("/usr/include/") != std::string::npos)

    return false;

  if (FileName == "<null>")

    return false;

  return true;

}

void RawPrint(const char *Str) {

  write(2, Str, strlen(Str));

}

}  // namespace fuzzer

#endif // LIBFUZZER_POSIX