121 lines
3.7 KiB
C
121 lines
3.7 KiB
C
/****************************************************************************
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* env_putenv.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 <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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/****************************************************************************
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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: putenv
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*
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* Description:
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* The putenv() function adds or changes the value of environment variables.
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* The argument string is of the form name=value. If name does not already
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* exist in the environment, then string is added to the environment. If
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* name does exist, then the value of name in the environment is changed to
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* value.
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*
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* Parameters:
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* name=value string describing the environment setting to add/modify
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*
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* Return Value:
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* Zero on sucess
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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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int putenv(char *string)
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{
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char *pname;
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char *pequal;
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int ret = OK;
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/* Verify that a string was passed */
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if (!string)
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{
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ret = EINVAL;
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goto errout;
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}
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/* Parse the name=value string */
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pname = strdup(string);
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if (!pname)
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{
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ret = ENOMEM;
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goto errout;
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}
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pequal = strchr( pname, '=');
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if (pequal)
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{
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/* Then let setenv do all of the work */
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*pequal = '\0';
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ret = setenv(pname, pequal+1, TRUE);
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}
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free(pname);
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return ret;
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errout:
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*get_errno_ptr() = ret;
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return ERROR;
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}
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#endif /* CONFIG_DISABLE_ENVIRON */
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