libc/stdio/_rfill.c

   1 /* Copyright (C) 2004       Manuel Novoa III    <mjn3@codepoet.org>
   2  *
   3  * GNU Library General Public License (LGPL) version 2 or later.
   4  *
   5  * Dedicated to Toni.  See uClibc/DEDICATION.mjn3 for details.
   6  */
   7
   8 #include "_stdio.h"
   9
  10 #ifdef __UCLIBC_MJN3_ONLY__
  11 #warning CONSIDER: Do we really need a seperate rfill function?
  12 #endif
  13
  14 #ifdef __STDIO_BUFFERS
  15
  16 /* Read some data into the buffer.
  17  * Returns number of bytes read into the buffer.
  18  * If 0 is returned, then either EOF or ERROR.
  19  * Side effects are those of _stdio_READ.
  20  */
  21
  22 size_t attribute_hidden __stdio_rfill(register FILE *__restrict stream)
  23 {
  24         size_t rv;
  25
  26         __STDIO_STREAM_VALIDATE(stream);
  27         assert(stream->__filedes >= -1);
  28         assert(__STDIO_STREAM_IS_READING(stream));
  29         assert(!__STDIO_STREAM_BUFFER_RAVAIL(stream)); /* Buffer must be empty. */
  30         assert(__STDIO_STREAM_BUFFER_SIZE(stream));     /* Must have a buffer. */
  31         assert(!(stream->__modeflags & __FLAG_UNGOT));
  32 #ifdef __UCLIBC_HAS_STDIO_GETC_MACRO__
  33         assert(stream->__bufgetc_u == stream->__bufstart);
  34 #endif
  35
  36         rv = __stdio_READ(stream, stream->__bufstart,
  37                                           stream->__bufend - stream->__bufstart);
  38         stream->__bufpos = stream->__bufstart;
  39         stream->__bufread = stream->__bufstart + rv;
  40
  41         __STDIO_STREAM_VALIDATE(stream);
  42         return rv;
  43 }
  44
  45 #endif