**************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
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* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
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* SPDX-License-Identifier: curl
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**************************************************************************
curl_getenv - return value for environment name

#include <curl/curl.h>

char *curl_getenv(const char *name);

curl_getenv() is a portable wrapper for the getenv() function, meant to emulate its behavior and provide an identical interface for all operating systems libcurl builds on (including win32). You must curl_free(3) the returned string when you are done with it.

 char *width = curl_getenv("COLUMNS");
 if(width) {
 /* it was set! */
 curl_free(width);
 }

Always A pointer to a null-terminated string or NULL if it failed to find the specified name. Under unix operating systems, there is no point in returning an allocated memory, although other systems will not work properly if this is not done. The unix implementation thus has to suffer slightly from the drawbacks of other systems. getenv "(3C), "