compiler/clib/fread.c

   1 /*
   2     Copyright © 1995-2012, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     C99 function fread().
   6 */
   7
   8 #include <errno.h>
   9 #include <dos/dos.h>
  10 #include <dos/dosextens.h>
  11 #include <proto/exec.h>
  12 #include <proto/dos.h>
  13 #include "__stdio.h"
  14 #include "__fdesc.h"
  15
  16 /*****************************************************************************
  17
  18     NAME */
  19 #include <stdio.h>
  20
  21         size_t fread (
  22
  23 /*  SYNOPSIS */
  24         void * buf,
  25         size_t size,
  26         size_t nblocks,
  27         FILE * stream)
  28
  29 /*  FUNCTION
  30         Read an amount of bytes from a stream.
  31
  32     INPUTS
  33         buf - The buffer to read the bytes into
  34         size - Size of one block to read
  35         nblocks - The number of blocks to read
  36         stream - Read from this stream
  37
  38     RESULT
  39         The number of blocks read. This may range from 0 when the stream
  40         contains no more blocks up to nblocks. In case of an error, 0 is
  41         returned.
  42
  43     NOTES
  44
  45     EXAMPLE
  46
  47     BUGS
  48
  49     SEE ALSO
  50         fopen(), fwrite()
  51
  52     INTERNALS
  53
  54 ******************************************************************************/
  55 {
  56     size_t cnt;
  57     fdesc *fdesc = __getfdesc(stream->fd);
  58
  59     if (!fdesc)
  60     {
  61         stream->flags |= _STDIO_ERROR;
  62         errno = EBADF;
  63         return 0;
  64     }
  65
  66     cnt = FRead ((BPTR)fdesc->fcb->fh, buf, size, nblocks);
  67
  68     if (cnt == -1)
  69     {
  70         errno = __arosc_ioerr2errno (IoErr ());
  71         stream->flags |= _STDIO_ERROR;
  72
  73         cnt = 0;
  74     }
  75     else if (cnt == 0 || cnt < nblocks)
  76     {
  77         stream->flags |= _STDIO_EOF;
  78     }
  79
  80     return cnt;
  81 } /* fread */
  82