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