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