| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "Tokenizer" |
| |
| #include <utils/Tokenizer.h> |
| #include <fcntl.h> |
| #include <sys/stat.h> |
| #include <utils/Log.h> |
| |
| #ifndef DEBUG_TOKENIZER |
| // Enables debug output for the tokenizer. |
| #define DEBUG_TOKENIZER 0 |
| #endif |
| |
| namespace android { |
| |
| static inline bool isDelimiter(char ch, const char* delimiters) { |
| return strchr(delimiters, ch) != nullptr; |
| } |
| |
| Tokenizer::Tokenizer(const String8& filename, FileMap* fileMap, char* buffer, |
| bool ownBuffer, size_t length) : |
| mFilename(filename), mFileMap(fileMap), |
| mBuffer(buffer), mOwnBuffer(ownBuffer), mLength(length), |
| mCurrent(buffer), mLineNumber(1) { |
| } |
| |
| Tokenizer::~Tokenizer() { |
| delete mFileMap; |
| if (mOwnBuffer) { |
| delete[] mBuffer; |
| } |
| } |
| |
| status_t Tokenizer::open(const String8& filename, Tokenizer** outTokenizer) { |
| *outTokenizer = nullptr; |
| |
| int result = OK; |
| int fd = ::open(filename.c_str(), O_RDONLY); |
| if (fd < 0) { |
| result = -errno; |
| ALOGE("Error opening file '%s': %s", filename.c_str(), strerror(errno)); |
| } else { |
| struct stat stat; |
| if (fstat(fd, &stat)) { |
| result = -errno; |
| ALOGE("Error getting size of file '%s': %s", filename.c_str(), strerror(errno)); |
| } else { |
| size_t length = size_t(stat.st_size); |
| |
| FileMap* fileMap = new FileMap(); |
| bool ownBuffer = false; |
| char* buffer; |
| if (fileMap->create(nullptr, fd, 0, length, true)) { |
| fileMap->advise(FileMap::SEQUENTIAL); |
| buffer = static_cast<char*>(fileMap->getDataPtr()); |
| } else { |
| delete fileMap; |
| fileMap = nullptr; |
| |
| // Fall back to reading into a buffer since we can't mmap files in sysfs. |
| // The length we obtained from stat is wrong too (it will always be 4096) |
| // so we must trust that read will read the entire file. |
| buffer = new char[length]; |
| ownBuffer = true; |
| ssize_t nrd = read(fd, buffer, length); |
| if (nrd < 0) { |
| result = -errno; |
| ALOGE("Error reading file '%s': %s", filename.c_str(), strerror(errno)); |
| delete[] buffer; |
| buffer = nullptr; |
| } else { |
| length = size_t(nrd); |
| } |
| } |
| |
| if (!result) { |
| *outTokenizer = new Tokenizer(filename, fileMap, buffer, ownBuffer, length); |
| } |
| } |
| close(fd); |
| } |
| return result; |
| } |
| |
| status_t Tokenizer::fromContents(const String8& filename, |
| const char* contents, Tokenizer** outTokenizer) { |
| *outTokenizer = new Tokenizer(filename, nullptr, |
| const_cast<char*>(contents), false, strlen(contents)); |
| return OK; |
| } |
| |
| String8 Tokenizer::getLocation() const { |
| String8 result; |
| result.appendFormat("%s:%d", mFilename.c_str(), mLineNumber); |
| return result; |
| } |
| |
| String8 Tokenizer::peekRemainderOfLine() const { |
| const char* end = getEnd(); |
| const char* eol = mCurrent; |
| while (eol != end) { |
| char ch = *eol; |
| if (ch == '\n') { |
| break; |
| } |
| eol += 1; |
| } |
| return String8(mCurrent, eol - mCurrent); |
| } |
| |
| String8 Tokenizer::nextToken(const char* delimiters) { |
| #if DEBUG_TOKENIZER |
| ALOGD("nextToken"); |
| #endif |
| const char* end = getEnd(); |
| const char* tokenStart = mCurrent; |
| while (mCurrent != end) { |
| char ch = *mCurrent; |
| if (ch == '\n' || isDelimiter(ch, delimiters)) { |
| break; |
| } |
| mCurrent += 1; |
| } |
| return String8(tokenStart, mCurrent - tokenStart); |
| } |
| |
| void Tokenizer::nextLine() { |
| #if DEBUG_TOKENIZER |
| ALOGD("nextLine"); |
| #endif |
| const char* end = getEnd(); |
| while (mCurrent != end) { |
| char ch = *(mCurrent++); |
| if (ch == '\n') { |
| mLineNumber += 1; |
| break; |
| } |
| } |
| } |
| |
| void Tokenizer::skipDelimiters(const char* delimiters) { |
| #if DEBUG_TOKENIZER |
| ALOGD("skipDelimiters"); |
| #endif |
| const char* end = getEnd(); |
| while (mCurrent != end) { |
| char ch = *mCurrent; |
| if (ch == '\n' || !isDelimiter(ch, delimiters)) { |
| break; |
| } |
| mCurrent += 1; |
| } |
| } |
| |
| } // namespace android |