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- /****************************************************************************
- * sched/environ/env_findvar.c
- *
- * Copyright (C) 2007, 2009, 2013-2014 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 <nuttx/config.h>
- #ifndef CONFIG_DISABLE_ENVIRON
- #include <stdbool.h>
- #include <string.h>
- #include <sched.h>
- #include "environ/environ.h"
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: env_cmpname
- ****************************************************************************/
- static bool env_cmpname(const char *pszname, const char *peqname)
- {
- /* Search until we find anything different in the two names */
- for (; *pszname == *peqname; pszname++, peqname++)
- {
- }
- /* On success, pszname will end with '\0' and peqname with '=' */
- if (*pszname == '\0' && *peqname == '=')
- {
- return true;
- }
- return false;
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: env_findvar
- *
- * Description:
- * Search the provided environment structure for the variable of the
- * specified name.
- *
- * Input Parameters:
- * group - The task group containing environment array to be searched.
- * pname - The variable name to find
- *
- * Returned Value:
- * A pointer to the name=value string in the environment
- *
- * Assumptions:
- * - Not called from an interrupt handler
- * - Pre-emption is disabled by caller
- *
- ****************************************************************************/
- FAR char *env_findvar(FAR struct task_group_s *group, FAR const char *pname)
- {
- FAR char *ptr;
- FAR char *end;
- /* Verify input parameters */
- DEBUGASSERT(group != NULL && pname != NULL);
- /* Search for a name=value string with matching name */
- end = &group->tg_envp[group->tg_envsize];
- for (ptr = group->tg_envp;
- ptr < end && !env_cmpname(pname, ptr);
- ptr += (strlen(ptr) + 1));
- /* Check for success */
- return (ptr < end) ? ptr : NULL;
- }
- #endif /* CONFIG_DISABLE_ENVIRON */
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