102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
/****************************************************************************
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* sched/environ/env_foreach.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 <stdbool.h>
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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/environ.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_foreach
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*
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* Description:
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* Visit each name-value pair in the environment.
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*
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* Input Parameters:
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* group - The task group containing environment array to be searched.
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* cb - The callback function to be invoked for each environment
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* variable.
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*
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* Returned Value:
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* Zero if the all environment variables have been traversed. A non-zero
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* value means that the callback function requested early termination by
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* returning a nonzero value.
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*
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* Assumptions:
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* - Not called from an interrupt handler
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* - Pre-emptions is disabled by caller
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*
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****************************************************************************/
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int env_foreach(FAR struct task_group_s *group,
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env_foreach_t cb,
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FAR void *arg)
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{
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int ret = OK;
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size_t i;
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/* Verify input parameters */
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DEBUGASSERT(group != NULL && cb != NULL);
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if (group->tg_envp == NULL)
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{
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return ret;
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}
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for (i = 0; group->tg_envp[i] != NULL; i++)
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{
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/* Perform the callback */
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ret = cb(arg, group->tg_envp[i]);
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/* Terminate the traversal early if the callback so requests by
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* returning a non-zero value.
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*/
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if (ret != 0)
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{
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break;
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}
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}
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DEBUGASSERT(ret != OK || group->tg_envc == i);
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return ret;
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}
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#endif /* CONFIG_DISABLE_ENVIRON */
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