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/****************************************************************************
* sched/env_putenv.c
*
* Copyright (C) 2007-2009, 2011 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 <stdlib.h>
#include <sched.h>
#include <string.h>
#include <errno.h>
#include <nuttx/kmalloc.h>
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: putenv
*
* Description:
* The putenv() function adds or changes the value of environment variables.
* The argument string is of the form name=value. If name does not already
* exist in the environment, then string is added to the environment. If
* name does exist, then the value of name in the environment is changed to
* value.
*
* Parameters:
* name=value string describing the environment setting to add/modify
*
* Return Value:
* Zero on sucess
*
* Assumptions:
* Not called from an interrupt handler
*
****************************************************************************/
int putenv(FAR const char *string)
{
char *pname;
char *pequal;
int ret = OK;
/* Verify that a string was passed */
if (!string)
{
ret = EINVAL;
goto errout;
}
/* Parse the name=value string */
pname = strdup(string);
if (!pname)
{
ret = ENOMEM;
goto errout;
}
pequal = strchr( pname, '=');
if (pequal)
{
/* Then let setenv do all of the work */
*pequal = '\0';
ret = setenv(pname, pequal+1, TRUE);
}
kfree(pname);
return ret;
errout:
errno = ret;
return ERROR;
}
#endif /* CONFIG_DISABLE_ENVIRON */
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