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121 lines
4.4 KiB
121 lines
4.4 KiB
/**************************************************************************** |
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* sched/env_removevar.c |
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* |
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* Copyright (C) 2007, 2009 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 <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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* Name: 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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* group The task group with 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(FAR struct task_group_s *group, FAR char *pvar) |
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{ |
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FAR char *end; /* Pointer to the end+1 of the environment */ |
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int alloc; /* Size of the allocated environment */ |
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int ret = ERROR; |
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DEBUGASSERT(group && pvar); |
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/* Verify that the pointer lies within the environment region */ |
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alloc = group->tg_envsize; /* Size of the allocated environment */ |
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end = &group->tg_envp[alloc]; /* Pointer to the end+1 of the environment */ |
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if (pvar >= group->tg_envp && 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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group->tg_envsize -= len; |
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ret = OK; |
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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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