98 lines
3.0 KiB
C
98 lines
3.0 KiB
C
/****************************************************************************
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* sched/environ/env_removevar.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifndef CONFIG_DISABLE_ENVIRON
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#include <string.h>
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#include <sched.h>
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#include <assert.h>
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#include <nuttx/kmalloc.h>
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#include "environ/environ.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: env_removevar
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*
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* Description:
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* Remove the referenced name=value pair from the environment
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*
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* Input Parameters:
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* group - The task group with the environment containing the name=value
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* pair
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* index - A index to the name=value pair in the restroom
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* - Not called from an interrupt handler
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* - Caller has pre-emption disabled
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* - Caller will reallocate the environment structure to the correct size
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*
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****************************************************************************/
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void env_removevar(FAR struct task_group_s *group, int index)
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{
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DEBUGASSERT(group != NULL && index >= 0);
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/* Free the allocate environment string */
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group_free(group, group->tg_envp[index]);
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/* Move all of the environment strings after the removed one 'down.'
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* this is inefficient, but robably not high duty.
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*/
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do
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{
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group->tg_envp[index] = group->tg_envp[index + 1];
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}
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while (group->tg_envp[++index] != NULL);
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/* Free the old environment (if there was one) */
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if (index == 1)
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{
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group_free(group, group->tg_envp);
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group->tg_envp = NULL;
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}
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else
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{
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/* Reallocate the environment to reclaim a little memory */
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group->tg_envp = group_realloc(group, group->tg_envp,
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sizeof(*group->tg_envp) * (index + 1));
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DEBUGASSERT(group->tg_envp != NULL);
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}
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}
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#endif /* CONFIG_DISABLE_ENVIRON */
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