104 lines
3.5 KiB
C
104 lines
3.5 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 "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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* pvar - A pointer to the name=value pair in the restroom
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*
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* Returned Value:
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* Zero on success
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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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int env_removevar(FAR struct task_group_s *group, FAR char *pvar)
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{
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FAR char *end; /* Pointer to the end+1 of the environment */
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int alloc; /* Size of the allocated environment */
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int ret = ERROR;
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DEBUGASSERT(group != NULL && pvar != NULL);
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/* Verify that the pointer lies within the environment region */
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alloc = group->tg_envsize; /* Size of the allocated environment */
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end = &group->tg_envp[alloc]; /* Pointer to the end+1 of the environment */
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if (pvar >= group->tg_envp && pvar < end)
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{
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/* Set up for the removal */
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int len = strlen(pvar) + 1; /* Length of name=value string to remove */
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FAR char *src = &pvar[len]; /* Address of name=value string after */
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FAR char *dest = pvar; /* Location to move the next string */
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int count = end - src; /* Number of bytes to move (might be zero) */
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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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while (count-- > 0)
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{
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*dest++ = *src++;
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}
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/* Then set to the new allocation size. The caller is expected to
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* call realloc at some point but we don't do that here because the
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* caller may add more stuff to the environment.
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*/
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group->tg_envsize -= len;
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ret = OK;
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}
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return ret;
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}
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#endif /* CONFIG_DISABLE_ENVIRON */
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