replicant-frameworks_native/libs/utils/Tokenizer.cpp
Jeff Brown 9ee93d18ed Fix SDK build on Windows due to use of mmap.
Change-Id: Id4bd9a6f932285c93c5853e540efc20b99876564
2010-11-19 13:52:19 -08:00

153 lines
4.1 KiB
C++

/*
* 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 <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <utils/Log.h>
#include <utils/Tokenizer.h>
// Enables debug output for the tokenizer.
#define DEBUG_TOKENIZER 0
namespace android {
static inline bool isDelimiter(char ch, const char* delimiters) {
return strchr(delimiters, ch) != NULL;
}
Tokenizer::Tokenizer(const String8& filename, FileMap* fileMap,
const char* buffer, size_t length) :
mFilename(filename), mFileMap(fileMap), mBuffer(buffer), mLength(length),
mCurrent(buffer), mLineNumber(1) {
}
Tokenizer::~Tokenizer() {
if (mFileMap) {
mFileMap->release();
}
}
status_t Tokenizer::open(const String8& filename, Tokenizer** outTokenizer) {
*outTokenizer = NULL;
int result = NO_ERROR;
int fd = ::open(filename.string(), O_RDONLY);
if (fd < 0) {
result = -errno;
LOGE("Error opening file '%s', %s.", filename.string(), strerror(errno));
} else {
struct stat stat;
if (fstat(fd, &stat)) {
result = -errno;
LOGE("Error getting size of file '%s', %s.", filename.string(), strerror(errno));
} else {
size_t length = size_t(stat.st_size);
FileMap* fileMap = new FileMap();
if (!fileMap->create(NULL, fd, 0, length, true)) {
result = NO_MEMORY;
LOGE("Error mapping file '%s', %s.", filename.string(), strerror(errno));
} else {
fileMap->advise(FileMap::SEQUENTIAL);
*outTokenizer = new Tokenizer(filename, fileMap,
static_cast<const char*>(fileMap->getDataPtr()), length);
if (!*outTokenizer) {
result = NO_MEMORY;
LOGE("Error allocating tokenizer for file=%s.", filename.string());
}
}
if (result) {
fileMap->release();
}
}
close(fd);
}
return result;
}
String8 Tokenizer::getLocation() const {
String8 result;
result.appendFormat("%s:%d", mFilename.string(), 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
LOGD("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
LOGD("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
LOGD("skipDelimiters");
#endif
const char* end = getEnd();
while (mCurrent != end) {
char ch = *mCurrent;
if (ch == '\n' || !isDelimiter(ch, delimiters)) {
break;
}
mCurrent += 1;
}
}
} // namespace android