reactos/lib/msvcrt/io/read.c

   1 /*
   2  * COPYRIGHT:   See COPYING in the top level directory
   3  * PROJECT:     ReactOS system libraries
   4  * FILE:        lib/msvcrt/io/read.c
   5  * PURPOSE:     Reads 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 size_t _read(int _fd, void *_buf, size_t _nbyte)
  18 {
  19    DWORD _rbyte = 0, nbyte = _nbyte, count;
  20    int cr;
  21    char *bufp = (char*)_buf;
  22
  23    DPRINT("_read(fd %d, buf %x, nbyte %d)\n", _fd, _buf, _nbyte);
  24
  25    while (nbyte)
  26    {
  27       if (!ReadFile(_get_osfhandle(_fd), bufp, nbyte, &_rbyte, NULL))
  28       {
  29          return -1;
  30       }
  31       if (_rbyte == 0)
  32          break;
  33       if (__fileno_getmode(_fd) & O_TEXT)
  34       {
  35          cr = 0;
  36          count = _rbyte;
  37          while (count)
  38          {
  39             if (*bufp == '\r')
  40                cr++;
  41             else if (cr != 0)
  42                    *(bufp - cr) = *bufp;
  43             bufp++;
  44             count--;
  45          }
  46          _rbyte -= cr;
  47          bufp -= cr;
  48       }
  49       nbyte -= _rbyte;
  50    }
  51    DPRINT("%d\n", _nbyte - nbyte);
  52    return _nbyte - nbyte;
  53 }