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 __STDIO_BUFFERS
  11
  12 /* Read some data into the buffer.
  13  * Returns number of bytes read into the buffer.
  14  * If 0 is returned, then either EOF or ERROR.
  15  * Side effects are those of _stdio_READ.
  16  */
  17
  18 size_t attribute_hidden __stdio_rfill(register FILE *__restrict stream)
  19 {
  20         size_t rv;
  21
  22         __STDIO_STREAM_VALIDATE(stream);
  23         assert(stream->__filedes >= -2);
  24         assert(__STDIO_STREAM_IS_READING(stream));
  25         assert(!__STDIO_STREAM_BUFFER_RAVAIL(stream)); /* Buffer must be empty. */
  26         assert(__STDIO_STREAM_BUFFER_SIZE(stream));     /* Must have a buffer. */
  27         assert(!(stream->__modeflags & __FLAG_UNGOT));
  28 #ifdef __UCLIBC_HAS_STDIO_GETC_MACRO__
  29         assert(stream->__bufgetc_u == stream->__bufstart);
  30 #endif
  31
  32         rv = __stdio_READ(stream, stream->__bufstart,
  33                                           stream->__bufend - stream->__bufstart);
  34         stream->__bufpos = stream->__bufstart;
  35         stream->__bufread = stream->__bufstart + rv;
  36
  37         __STDIO_STREAM_VALIDATE(stream);
  38         return rv;
  39 }
  40
  41 #endif