// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/process/process_iterator.h"

#include "build/build_config.h"

namespace base {

#if BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
ProcessEntry::ProcessEntry() : pid_(0), ppid_(0), gid_(0) {}
ProcessEntry::ProcessEntry(const ProcessEntry& other) = default;
ProcessEntry::~ProcessEntry() = default;
#endif

const ProcessEntry* ProcessIterator::NextProcessEntry() {
  bool result = false;
  do {
    result = CheckForNextProcess();
  } while (result && !IncludeEntry());
  if (result) {
    return &entry_;
  }
  return nullptr;
}

ProcessIterator::ProcessEntries ProcessIterator::Snapshot() {
  ProcessEntries found;
  while (const ProcessEntry* process_entry = NextProcessEntry()) {
    found.push_back(*process_entry);
  }
  return found;
}

bool ProcessIterator::IncludeEntry() {
  return !filter_ || filter_->Includes(entry_);
}

NamedProcessIterator::NamedProcessIterator(
    const FilePath::StringType& executable_name,
    const ProcessFilter* filter,
    bool use_prefix_match)
    : ProcessIterator(filter),
      executable_name_(executable_name),
      use_prefix_match_(use_prefix_match) {
#if BUILDFLAG(IS_ANDROID)
  // On Android, the process name contains only the last 15 characters, which
  // is in file /proc/<pid>/stat, the string between open parenthesis and close
  // parenthesis. Please See ProcessIterator::CheckForNextProcess for details.
  // Now if the length of input process name is greater than 15, only save the
  // last 15 characters.
  if (executable_name_.size() > 15) {
    executable_name_ = FilePath::StringType(executable_name_,
                                            executable_name_.size() - 15, 15);
  }
#endif
}

NamedProcessIterator::~NamedProcessIterator() = default;

int GetProcessCount(const FilePath::StringType& executable_name,
                    const ProcessFilter* filter) {
  int count = 0;
  NamedProcessIterator iter(executable_name, filter);
  while (iter.NextProcessEntry()) {
    ++count;
  }
  return count;
}

}  // namespace base