diff options
Diffstat (limited to 'nuttx/libc/queue/dq_remlast.c')
-rw-r--r-- | nuttx/libc/queue/dq_remlast.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/nuttx/libc/queue/dq_remlast.c b/nuttx/libc/queue/dq_remlast.c new file mode 100644 index 000000000..18c182335 --- /dev/null +++ b/nuttx/libc/queue/dq_remlast.c @@ -0,0 +1,78 @@ +/**************************************************************************** + * libc/queue/dq_remlast.c + * + * Copyright (C) 2007, 2008, 2011 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 <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; +} + |