curl/docs/libcurl/curl_getenv.3

.\" **************************************************************************
.\" *                                  _   _ ____  _
.\" *  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.
.\" *
.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
.\" * copies of the Software, and permit persons to whom the Software is
.\" * furnished to do so, under the terms of the COPYING file.
.\" *
.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
.\" * KIND, either express or implied.
.\" *
.\" * SPDX-License-Identifier: curl
.\" *
.\" **************************************************************************
.TH curl_getenv 3 "30 April 2004" "libcurl" "libcurl"
.SH NAME
curl_getenv - return value for environment name
.SH SYNOPSIS
.nf
#include <curl/curl.h>

char *curl_getenv(const char *name);
.fi
.SH DESCRIPTION
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 \fIcurl_free(3)\fP the returned string when you are done with it.
.SH EXAMPLE
.nf
  char *width = curl_getenv("COLUMNS");
  if(width) {
    /* it was set! */
    curl_free(width);
  }
.fi
.SH AVAILABILITY
Always
.SH RETURN VALUE
A pointer to a null-terminated string or NULL if it failed to find the
specified name.
.SH NOTE
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.
.SH "SEE ALSO"
.BR getenv "(3C), "