Fix a bug about the iSCSI DHCP dependency issue.

[mirror_edk2.git] / StdLib / LibC / Uefi / writev.c

/*\r
 * Copyright (c) 1999, 2000\r
 * Intel Corporation.\r
 * All rights reserved.\r
 *\r
 * Redistribution and use in source and binary forms, with or without modification,\r
 * are permitted provided that the following conditions are met:\r
 *\r
 * 1. Redistributions of source code must retain the above copyright notice,\r
 *    this list of conditions and the following disclaimer.\r
 *\r
 * 2. Redistributions in binary form must reproduce the above copyright notice,\r
 *    this list of conditions and the following disclaimer in the documentation\r
 *    and/or other materials provided with the distribution.\r
 *\r
 * 3. All advertising materials mentioning features or use of this software must\r
 *    display the following acknowledgement:\r
 *\r
 *    This product includes software developed by Intel Corporation and its\r
 *    contributors.\r
 *\r
 * 4. Neither the name of Intel Corporation or its contributors may be used to\r
 *    endorse or promote products derived from this software without specific\r
 *    prior written permission.\r
 *\r
 * THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION AND CONTRIBUTORS ``AS IS'' AND\r
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\r
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE\r
 * DISCLAIMED.  IN NO EVENT SHALL INTEL CORPORATION OR CONTRIBUTORS BE LIABLE FOR\r
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\r
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\r
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON\r
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\r
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS\r
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\r
 *\r
 */\r
\r
/*++\r
\r
Module Name:\r
\r
    writev.c\r
\r
Abstract:\r
\r
    Functions implementing the standard "writev" system call interface\r
\r
\r
Revision History\r
\r
--*/\r
#include  <LibConfig.h>\r
\r
#ifdef foo\r
#include <efi_interface.h>\r
#include <unistd.h>\r
#include <fcntl.h>\r
#define KERNEL\r
#include <errno.h>\r
#undef KERNEL\r
#include "./filedesc.h"\r
\r
#include <libc_debug.h>\r
#include <assert.h>\r
#endif\r
\r
#include <stdlib.h>\r
#include <unistd.h>\r
#include <sys/uio.h>\r
#include <string.h>\r
#ifndef KERNEL\r
#define KERNEL\r
#include <errno.h>\r
#undef KERNEL\r
#else\r
#include <errno.h>\r
#endif\r
\r
//\r
//  Name:\r
//      writev\r
//\r
//  Description:\r
//      BSD writev interface for libc\r
//\r
//  Arguments:\r
//      File Descriptor (index into file descriptor table)\r
//      iovec pointer\r
//      size of iovec array\r
//\r
//  Returns:\r
//      number of bytes written\r
//\r
\r
ssize_t\r
writev(\r
    int fd,\r
    const struct iovec *iov,\r
    int iovcnt\r
    )\r
{\r
  const struct iovec  *pVecTmp;\r
  char      *pBuf, *pBufTmp;\r
  size_t      TotalBytes, i, ret;\r
\r
  //\r
  //  See how much memory we'll need\r
  //\r
\r
  for (i = 0, TotalBytes = 0, pVecTmp = iov; i < (size_t)iovcnt; i++, pVecTmp++) {\r
    TotalBytes += pVecTmp->iov_len;\r
  }\r
\r
  //\r
  //  Allocate a contiguous buffer\r
  //\r
\r
  pBuf = (char*)malloc (TotalBytes);\r
  if (pBuf == NULL) {\r
    errno = ENOMEM;\r
    return -1;\r
  }\r
\r
  //\r
  //  Copy vectors to the buffer\r
  //\r
\r
  for (pBufTmp = pBuf; iovcnt; iovcnt--) {\r
    bcopy(iov->iov_base, pBuf, iov->iov_len);\r
    pBuf += iov->iov_len;\r
    iov++;\r
  }\r
\r
  //\r
  //  Use standard write(2) then free buffer\r
  //\r
\r
  ret = write (fd, pBuf, TotalBytes);\r
  free (pBuf);\r
\r
  return (ret);\r
}\r