forked from Archive/PX4-Autopilot
119 lines
4.3 KiB
C
119 lines
4.3 KiB
C
/****************************************************************************
|
|
* sched/env_removevar.c
|
|
*
|
|
* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
*
|
|
* 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 <string.h>
|
|
#include <sched.h>
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: env_removevar
|
|
*
|
|
* Description:
|
|
* Remove the referenced name=value pair from the environment
|
|
*
|
|
* Parameters:
|
|
* envp The environment containing the name=value pair
|
|
* pvar A pointer to the name=value pair in the restroom
|
|
*
|
|
* Return Value:
|
|
* Zero on success
|
|
*
|
|
* Assumptions:
|
|
* - Not called from an interrupt handler
|
|
* - Caller has pre-emptions disabled
|
|
* - Caller will reallocate the environment structure to the correct size
|
|
*
|
|
****************************************************************************/
|
|
|
|
int env_removevar(environ_t *envp, char *pvar)
|
|
{
|
|
int ret = ERROR;
|
|
if (envp && pvar)
|
|
{
|
|
/* Verify that the pointer lies within the environment region */
|
|
|
|
int alloc = envp->ev_alloc; /* Size of the allocated environment */
|
|
char *end = &envp->ev_env[alloc]; /* Pointer to the end+1 of the environment */
|
|
|
|
if (pvar >= envp->ev_env && pvar < end)
|
|
{
|
|
/* Set up for the removal */
|
|
|
|
int len = strlen(pvar) + 1; /* Length of name=value string to remove */
|
|
char *src = &pvar[len]; /* Address of name=value string after */
|
|
char *dest = pvar; /* Location to move the next string */
|
|
int count = end - src; /* Number of bytes to move (might be zero) */
|
|
|
|
/* Move all of the environment strings after the removed one 'down.'
|
|
* this is inefficient, but robably not high duty.
|
|
*/
|
|
|
|
while (count-- > 0)
|
|
{
|
|
*dest++ = *src++;
|
|
}
|
|
|
|
/* Then set to the new allocation size. The caller is expected to
|
|
* call realloc at some point but we don't do that here because the
|
|
* caller may add more stuff to the environment.
|
|
*/
|
|
|
|
envp->ev_alloc -= len;
|
|
ret = OK;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_DISABLE_ENVIRON */
|
|
|
|
|
|
|