diff options
Diffstat (limited to 'nuttx/lib/stdio/lib_rawinstream.c')
| -rw-r--r-- | nuttx/lib/stdio/lib_rawinstream.c | 34 |
1 files changed, 20 insertions, 14 deletions
diff --git a/nuttx/lib/stdio/lib_rawinstream.c b/nuttx/lib/stdio/lib_rawinstream.c index ead3116b4..aacc8f867 100644 --- a/nuttx/lib/stdio/lib_rawinstream.c +++ b/nuttx/lib/stdio/lib_rawinstream.c @@ -1,8 +1,8 @@ /**************************************************************************** * lib/stdio/lib_rawinstream.c * - * Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -38,7 +38,9 @@ ****************************************************************************/ #include <unistd.h> +#include <assert.h> #include <errno.h> + #include "lib_internal.h" /**************************************************************************** @@ -52,23 +54,27 @@ static int rawinstream_getc(FAR struct lib_instream_s *this) { FAR struct lib_rawinstream_s *rthis = (FAR struct lib_rawinstream_s *)this; + int nwritten; char ch; - if (this && rthis->fd >= 0) + DEBUGASSERT(this && rthis->fd >= 0); + + /* Attempt to read one character */ + + nwritten = read(rthis->fd, &ch, 1); + if (nwritten == 1) { - int nwritten; - do - { - nwritten = read(rthis->fd, &ch, 1); - if (nwritten == 1) - { - this->nget++; - return ch; - } - } - while (nwritten < 0 && get_errno() == EINTR); + this->nget++; + return ch; } + /* Return EOF on any failure to read from the incoming byte stream. The + * only expected error is EINTER meaning that the read was interrupted + * by a signal. A Zero return value would indicated an end-of-file + * confition. + */ + + DEBUGASSERT(nwritten == 0 || get_errno() == EINTR); return EOF; } |