112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
/****************************************************************************
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* sched/environ/env_foreach.c
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*
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* Copyright (C) 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <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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* Search the provided environment structure for the variable of the
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* specified name.
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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, env_foreach_t cb, FAR void *arg)
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{
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FAR char *ptr;
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FAR char *end;
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int ret = OK;
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/* Verify input parameters */
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DEBUGASSERT(group != NULL && cb != NULL);
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/* Search for a name=value string with matching name */
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end = &group->tg_envp[group->tg_envsize];
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for (ptr = group->tg_envp; ptr < end; ptr += (strlen(ptr) + 1))
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{
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/* Perform the callback */
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ret = cb(arg, ptr);
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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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return ret;
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}
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#endif /* CONFIG_DISABLE_ENVIRON */
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