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135 lines
4.0 KiB
135 lines
4.0 KiB
/**************************************************************************** |
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* env_getenv.c |
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* |
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* Copyright (C) 2007, 2008, 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 <sched.h> |
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#include <string.h> |
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#include <stdlib.h> |
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#include <errno.h> |
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#include "os_internal.h" |
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#include "env_internal.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: getenv |
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* |
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* Description: |
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* The getenv() function searches the environment list for a string that |
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* matches the string pointed to by name. |
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* |
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* Parameters: |
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* name - The name of the variable to find. |
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* |
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* Return Value: |
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* The value of the valiable (read-only) or NULL on failure |
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* |
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* Assumptions: |
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* Not called from an interrupt handler |
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* |
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****************************************************************************/ |
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FAR char *getenv(const char *name) |
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{ |
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FAR _TCB *rtcb; |
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FAR struct task_group_s *group; |
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FAR char *pvar; |
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FAR char *pvalue = NULL; |
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int ret = OK; |
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/* Verify that a string was passed */ |
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if (!name) |
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{ |
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ret = EINVAL; |
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goto errout; |
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} |
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/* Get a reference to the thread-private environ in the TCB.*/ |
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sched_lock(); |
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rtcb = (FAR _TCB*)g_readytorun.head; |
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group = rtcb->group; |
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/* Check if the variable exists */ |
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if ( !group || (pvar = env_findvar(group, name)) == NULL) |
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{ |
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ret = ENOENT; |
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goto errout_with_lock; |
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} |
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/* It does! Get the value sub-string from the name=value string */ |
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pvalue = strchr(pvar, '='); |
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if (!pvalue) |
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{ |
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/* The name=value string has no '=' This is a bug! */ |
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ret = EINVAL; |
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goto errout_with_lock; |
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} |
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/* Adjust the pointer so that it points to the value right after the '=' */ |
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pvalue++; |
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sched_unlock(); |
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return pvalue; |
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errout_with_lock: |
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sched_unlock(); |
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errout: |
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set_errno(ret); |
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return NULL; |
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} |
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#endif /* CONFIG_DISABLE_ENVIRON */ |
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