lib/msvcrt/io/write.c

   1 /*
   2  * COPYRIGHT:   See COPYING in the top level directory
   3  * PROJECT:     ReactOS system libraries
   4  * FILE:        lib/msvcrt/io/write.c
   5  * PURPOSE:     Writes to a file
   6  * PROGRAMER:   Boudewijn Dekker
   7  * UPDATE HISTORY:
   8  *              28/12/98: Created
   9  */
  10 #include <windows.h>
  11 #include <msvcrt/io.h>
  12 #include <msvcrt/internal/file.h>
  13
  14 #define NDEBUG
  15 #include <msvcrt/msvcrtdbg.h>
  16
  17 #define BUFSIZE 4096
  18
  19 size_t _write(int _fd, const void *_buf, size_t _nbyte)
  20 {
  21    char *tmp, *in, *out;
  22    int count, result;
  23    DWORD wbyte;
  24
  25    DPRINT("_write(fd %d, buf %x, nbyte %d)\n", _fd, _buf, _nbyte);
  26    if (__fileno_getmode(_fd) & O_TEXT)
  27    {
  28       result = _nbyte;
  29       tmp = (char*) malloc(BUFSIZE);
  30       if (tmp == NULL)
  31       {
  32          return -1;
  33       }
  34       count = BUFSIZE;
  35       out = tmp;
  36       in = (char*) _buf;
  37       while (_nbyte--)
  38       {
  39          if (*in == 0x0a)
  40          {
  41             *out++ = 0x0d;
  42             count--;
  43             if (count == 0)
  44             {
  45                 if (!WriteFile(_get_osfhandle(_fd), tmp, BUFSIZE, &wbyte, NULL))
  46                 {
  47                    result = -1;
  48                    break;
  49                 }
  50                 if (wbyte < BUFSIZE)
  51                 {
  52                    result = in - (char*)_buf;
  53                    break;
  54                 }
  55                 count = BUFSIZE;
  56                 out = tmp;
  57             }
  58          }
  59          *out++ = *in++;
  60          count--;
  61          if (count == 0 || _nbyte == 0)
  62          {
  63             if (!WriteFile(_get_osfhandle(_fd), tmp, BUFSIZE - count, &wbyte, NULL))
  64             {
  65                 result = -1;
  66                 break;
  67             }
  68             if (wbyte < BUFSIZE - count)
  69             {
  70                 result = in - (char*)_buf;
  71                 break;
  72             }
  73             count = BUFSIZE;
  74             out = tmp;
  75          }
  76       }
  77       free(tmp);
  78       return result;
  79    }
  80    else
  81    {
  82       if(!WriteFile(_get_osfhandle(_fd), _buf, _nbyte, &wbyte, NULL))
  83       {
  84           return -1;
  85       }
  86       return wbyte;
  87    }
  88 }