Create libbase.

Move StringPrintf and the string based file I/O from libutils to
libbase.

Change-Id: I0297a6063874b9d92100e0dd5123fddfbda932fe

1 files changed, 123 insertions, 0 deletions

diff --git a/base/file.cpp b/base/file.cpp
new file mode 100644
index 0000000..773f33b
--- /dev/null
+++ b/base/file.cpp
@@ -0,0 +1,123 @@
+/*
+ * 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 "base/file.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <string>
+
+#define LOG_TAG "base.file"
+#include "cutils/log.h"
+#include "utils/Compat.h"  // For TEMP_FAILURE_RETRY on Darwin.
+
+namespace android {
+namespace base {
+
+bool ReadFdToString(int fd, std::string* content) {
+  content->clear();
+
+  char buf[BUFSIZ];
+  ssize_t n;
+  while ((n = TEMP_FAILURE_RETRY(read(fd, &buf[0], sizeof(buf)))) > 0) {
+    content->append(buf, n);
+  }
+  return (n == 0) ? true : false;
+}
+
+bool 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;
+  }
+  bool result = ReadFdToString(fd, content);
+  TEMP_FAILURE_RETRY(close(fd));
+  return result;
+}
+
+bool WriteStringToFd(const std::string& content, int fd) {
+  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) {
+      return false;
+    }
+    p += n;
+    left -= n;
+  }
+  return true;
+}
+
+static bool CleanUpAfterFailedWrite(const std::string& path) {
+  // Something went wrong. Let's not leave a corrupt file lying around.
+  int saved_errno = errno;
+  unlink(path.c_str());
+  errno = saved_errno;
+  return false;
+}
+
+#if !defined(_WIN32)
+bool WriteStringToFile(const std::string& content, const std::string& path,
+                       mode_t mode, uid_t owner, gid_t group) {
+  int fd = TEMP_FAILURE_RETRY(
+      open(path.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC | O_NOFOLLOW,
+           mode));
+  if (fd == -1) {
+    ALOGE("android::WriteStringToFile open failed: %s", strerror(errno));
+    return false;
+  }
+
+  // We do an explicit fchmod here because we assume that the caller really
+  // meant what they said and doesn't want the umask-influenced mode.
+  if (fchmod(fd, mode) == -1) {
+    ALOGE("android::WriteStringToFile fchmod failed: %s", strerror(errno));
+    return CleanUpAfterFailedWrite(path);
+  }
+  if (fchown(fd, owner, group) == -1) {
+    ALOGE("android::WriteStringToFile fchown failed: %s", strerror(errno));
+    return CleanUpAfterFailedWrite(path);
+  }
+  if (!WriteStringToFd(content, fd)) {
+    ALOGE("android::WriteStringToFile write failed: %s", strerror(errno));
+    return CleanUpAfterFailedWrite(path);
+  }
+  TEMP_FAILURE_RETRY(close(fd));
+  return true;
+}
+#endif
+
+bool 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;
+  }
+
+  bool result = WriteStringToFd(content, fd);
+  TEMP_FAILURE_RETRY(close(fd));
+  return result || CleanUpAfterFailedWrite(path);
+}
+
+}  // namespace base
+}  // namespace android