103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
/****************************************************************************
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* sched/environ/env_putenv.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <stdlib.h>
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#include <sched.h>
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#include <string.h>
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#include <errno.h>
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#include <nuttx/kmalloc.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: putenv
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*
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* Description:
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* The putenv() function adds or changes the value of environment
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* 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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* Input Parameters:
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* name=value string describing the environment setting to add/modify
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*
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* Returned 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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*
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****************************************************************************/
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int putenv(FAR const 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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kmm_free(pname);
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return ret;
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errout:
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set_errno(ret);
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return ERROR;
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}
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#endif /* CONFIG_DISABLE_ENVIRON */
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