platform_system_core/liblog/uio.cpp

/*
 * Copyright (C) 2007-2014 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.
 */

#if defined(_WIN32)

#include <unistd.h>

#include <log/uio.h>

#include "log_portability.h"

LIBLOG_ABI_PUBLIC int readv(int fd, struct iovec* vecs, int count) {
  int total = 0;

  for (; count > 0; count--, vecs++) {
    char* buf = static_cast<char*>(vecs->iov_base);
    int len = vecs->iov_len;

    while (len > 0) {
      int ret = read(fd, buf, len);
      if (ret < 0) {
        if (total == 0) total = -1;
        goto Exit;
      }
      if (ret == 0) goto Exit;

      total += ret;
      buf += ret;
      len -= ret;
    }
  }
Exit:
  return total;
}

LIBLOG_ABI_PUBLIC int writev(int fd, const struct iovec* vecs, int count) {
  int total = 0;

  for (; count > 0; count--, vecs++) {
    const char* buf = static_cast<const char*>(vecs->iov_base);
    int len = vecs->iov_len;

    while (len > 0) {
      int ret = write(fd, buf, len);
      if (ret < 0) {
        if (total == 0) total = -1;
        goto Exit;
      }
      if (ret == 0) goto Exit;

      total += ret;
      buf += ret;
      len -= ret;
    }
  }
Exit:
  return total;
}

#endif