Add Google-style ReadFileToString and WriteStringToFile. (dec12b2b) · Commits · e / os / android_system_core

include/utils/file.h

0 → 100644

+29 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2015 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.
		*/

		#ifndef UTILS_FILE_H
		#define UTILS_FILE_H

		#include <string>

		namespace android {

		bool ReadFileToString(const std::string& path, std::string* content);
		bool WriteStringToFile(const std::string& content, const std::string& path);

		} // namespace android

		#endif

libutils/Android.mk

+3 −10

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		@@ -14,9 +14,6 @@

		LOCAL_PATH:= $(call my-dir)

		# libutils is a little unique: It's built twice, once for the host
		# and once for the device.

		commonSources:= \
		BasicHashtable.cpp \
		BlobCache.cpp \
		@@ -42,7 +39,8 @@ commonSources:= \
		Tokenizer.cpp \
		Unicode.cpp \
		VectorImpl.cpp \
		misc.cpp
		file.cpp \
		misc.cpp \

		host_commonCflags := -DLIBUTILS_NATIVE=1 $(TOOL_CFLAGS) -Werror

		@@ -111,11 +109,6 @@ LOCAL_CFLAGS := -Werror

		include $(BUILD_SHARED_LIBRARY)

		# Include subdirectory makefiles
		# ============================================================

		# If we're building with ONE_SHOT_MAKEFILE (mm, mmm), then what the framework
		# team really wants is to build the stuff defined by this makefile.
		ifeq (,$(ONE_SHOT_MAKEFILE))
		# Build the tests in the tests/ subdirectory.
		include $(call first-makefiles-under,$(LOCAL_PATH))
		endif

libutils/file.cpp

0 → 100644

+68 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2015 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.
		*/

		#include "utils/file.h"

		#include <errno.h>
		#include <fcntl.h>
		#include <sys/stat.h>
		#include <sys/types.h>

		bool android::ReadFileToString(const std::string& path, std::string* content) {
		content->clear();

		int fd = TEMP_FAILURE_RETRY(open(path.c_str(), O_RDONLY \| O_CLOEXEC \| O_NOFOLLOW));
		if (fd == -1) {
		return false;
		}

		while (true) {
		char buf[BUFSIZ];
		ssize_t n = TEMP_FAILURE_RETRY(read(fd, &buf[0], sizeof(buf)));
		if (n == -1) {
		TEMP_FAILURE_RETRY(close(fd));
		return false;
		}
		if (n == 0) {
		TEMP_FAILURE_RETRY(close(fd));
		return true;
		}
		content->append(buf, n);
		}
		}

		bool android::WriteStringToFile(const std::string& content, const std::string& path) {
		int fd = TEMP_FAILURE_RETRY(open(path.c_str(),
		O_WRONLY \| O_CREAT \| O_TRUNC \| O_CLOEXEC \| O_NOFOLLOW,
		DEFFILEMODE));
		if (fd == -1) {
		return false;
		}

		const char* p = content.data();
		size_t left = content.size();
		while (left > 0) {
		ssize_t n = TEMP_FAILURE_RETRY(write(fd, p, left));
		if (n == -1) {
		TEMP_FAILURE_RETRY(close(fd));
		return false;
		}
		p += n;
		left -= n;
		}
		TEMP_FAILURE_RETRY(close(fd));
		return true;
		}

libutils/tests/Android.mk

+1 −0

Original line number	Diff line number	Diff line
		@@ -26,6 +26,7 @@ LOCAL_SRC_FILES := \
		BasicHashtable_test.cpp \
		BlobCache_test.cpp \
		BitSet_test.cpp \
		file_test.cpp \
		Looper_test.cpp \
		LruCache_test.cpp \
		String8_test.cpp \

libutils/tests/file_test.cpp

0 → 100644

+37 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2013 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.
		*/

		#include "utils/file.h"

		#include <errno.h>
		#include <gtest/gtest.h>

		TEST(file, ReadFileToString_ENOENT) {
		std::string s("hello");
		errno = 0;
		EXPECT_FALSE(android::ReadFileToString("/proc/does-not-exist", &s));
		EXPECT_EQ(ENOENT, errno);
		EXPECT_EQ("", s); // s was cleared.
		}

		TEST(file, ReadFileToString_success) {
		std::string s("hello");
		EXPECT_TRUE(android::ReadFileToString("/proc/version", &s));
		EXPECT_GT(s.length(), 6U);
		EXPECT_EQ('\n', s[s.length() - 1]);
		s[5] = 0;
		EXPECT_STREQ("Linux", s.c_str());
		}