diff options
author | px4dev <px4@purgatory.org> | 2012-08-04 15:12:36 -0700 |
---|---|---|
committer | px4dev <px4@purgatory.org> | 2012-08-04 15:12:36 -0700 |
commit | 8a365179eafdf3aea98e60ab9f5882b200d4c759 (patch) | |
tree | 4f38d6d4cd80bd0b6e22e2bb534c3f117ce44e56 /nuttx/lib/queue/dq_remlast.c | |
download | px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.tar.gz px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.tar.bz2 px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.zip |
Fresh import of the PX4 firmware sources.
Diffstat (limited to 'nuttx/lib/queue/dq_remlast.c')
-rw-r--r-- | nuttx/lib/queue/dq_remlast.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/nuttx/lib/queue/dq_remlast.c b/nuttx/lib/queue/dq_remlast.c new file mode 100644 index 000000000..6280a0e51 --- /dev/null +++ b/nuttx/lib/queue/dq_remlast.c @@ -0,0 +1,78 @@ +/**************************************************************************** + * lib/queue/dq_remlast.c + * + * Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 <queue.h> + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/***************************************************(************************ + * Name: dq_remlast + * + * Description: + * dq_remlast removes the last entry from 'queue' + * + ****************************************************************************/ + +FAR dq_entry_t *dq_remlast(dq_queue_t *queue) +{ + FAR dq_entry_t *ret = queue->tail; + + if (ret) + { + FAR dq_entry_t *prev = ret->blink; + if (!prev) + { + queue->head = NULL; + queue->tail = NULL; + } + else + { + queue->tail = prev; + prev->flink = NULL; + } + + ret->flink = NULL; + ret->blink = NULL; + } + + return ret; +} + |