StdLib/LibC/Uefi/writev.c

   1 /*
   2  * Copyright (c) 1999, 2000
   3  * Intel Corporation.
   4  * All rights reserved.
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   9  * 1. Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright notice,
  13  *    this list of conditions and the following disclaimer in the documentation
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  17  *    display the following acknowledgement:
  18  *
  19  *    This product includes software developed by Intel Corporation and its
  20  *    contributors.
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  22  * 4. Neither the name of Intel Corporation or its contributors may be used to
  23  *    endorse or promote products derived from this software without specific
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  38
  39 /*++
  40
  41 Module Name:
  42
  43     writev.c
  44
  45 Abstract:
  46
  47     Functions implementing the standard "writev" system call interface
  48
  49
  50 Revision History
  51
  52 --*/
  53 #include  <LibConfig.h>
  54
  55 #ifdef foo
  56 #include <efi_interface.h>
  57 #include <unistd.h>
  58 #include <fcntl.h>
  59 #define KERNEL
  60 #include <errno.h>
  61 #undef KERNEL
  62 #include "./filedesc.h"
  63
  64 #include <libc_debug.h>
  65 #include <assert.h>
  66 #endif
  67
  68 #include <stdlib.h>
  69 #include <unistd.h>
  70 #include <sys/uio.h>
  71 #include <string.h>
  72 #ifndef KERNEL
  73 #define KERNEL
  74 #include <errno.h>
  75 #undef KERNEL
  76 #else
  77 #include <errno.h>
  78 #endif
  79
  80 //
  81 //  Name:
  82 //      writev
  83 //
  84 //  Description:
  85 //      BSD writev interface for libc
  86 //
  87 //  Arguments:
  88 //      File Descriptor (index into file descriptor table)
  89 //      iovec pointer
  90 //      size of iovec array
  91 //
  92 //  Returns:
  93 //      number of bytes written
  94 //
  95
  96 ssize_t
  97 writev(
  98     int fd,
  99     const struct iovec *iov,
 100     int iovcnt
 101     )
 102 {
 103   const struct iovec  *pVecTmp;
 104   char      *pBuf, *pBufTmp;
 105   size_t      TotalBytes, i, ret;
 106
 107   //
 108   //  See how much memory we'll need
 109   //
 110
 111   for (i = 0, TotalBytes = 0, pVecTmp = iov; i < (size_t)iovcnt; i++, pVecTmp++) {
 112     TotalBytes += pVecTmp->iov_len;
 113   }
 114
 115   //
 116   //  Allocate a contiguous buffer
 117   //
 118
 119   pBuf = (char*)malloc (TotalBytes);
 120   if (pBuf == NULL) {
 121     errno = ENOMEM;
 122     return -1;
 123   }
 124
 125   //
 126   //  Copy vectors to the buffer
 127   //
 128
 129   for (pBufTmp = pBuf; iovcnt; iovcnt--) {
 130     bcopy(iov->iov_base, pBuf, iov->iov_len);
 131     pBuf += iov->iov_len;
 132     iov++;
 133   }
 134
 135   //
 136   //  Use standard write(2) then free buffer
 137   //
 138
 139   ret = write (fd, pBuf, TotalBytes);
 140   free (pBuf);
 141
 142   return (ret);
 143 }