diff options
Diffstat (limited to 'nuttx/libc/stdio/lib_rawinstream.c')
-rw-r--r-- | nuttx/libc/stdio/lib_rawinstream.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/nuttx/libc/stdio/lib_rawinstream.c b/nuttx/libc/stdio/lib_rawinstream.c new file mode 100644 index 000000000..55456769e --- /dev/null +++ b/nuttx/libc/stdio/lib_rawinstream.c @@ -0,0 +1,107 @@ +/**************************************************************************** + * libc/stdio/lib_rawinstream.c + * + * 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 + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <unistd.h> +#include <assert.h> +#include <errno.h> + +#include "lib_internal.h" + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: rawinstream_getc + ****************************************************************************/ + +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; + + DEBUGASSERT(this && rthis->fd >= 0); + + /* Attempt to read one character */ + + nwritten = read(rthis->fd, &ch, 1); + if (nwritten == 1) + { + this->nget++; + return ch; + } + + /* Return EOF on any failure to read from the incoming byte stream. The + * only expected error is EINTR meaning that the read was interrupted + * by a signal. A Zero return value would indicated an end-of-file + * confition. + */ + + return EOF; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: lib_rawinstream + * + * Description: + * Initializes a stream for use with a file descriptor. + * + * Input parameters: + * rawinstream - User allocated, uninitialized instance of struct + * lib_rawinstream_s to be initialized. + * fd - User provided file/socket descriptor (must have been opened + * for the correct access). + * + * Returned Value: + * None (User allocated instance initialized). + * + ****************************************************************************/ + +void lib_rawinstream(FAR struct lib_rawinstream_s *rawinstream, int fd) +{ + rawinstream->public.get = rawinstream_getc; + rawinstream->public.nget = 0; + rawinstream->fd = fd; +} + |