.\" ************************************************************************** .\" * _ _ ____ _ .\" * Project ___| | | | _ \| | .\" * / __| | | | |_) | | .\" * | (__| |_| | _ <| |___ .\" * \___|\___/|_| \_\_____| .\" * .\" * Copyright (C) Daniel Stenberg, , 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 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 does not work properly if this is not done. The unix implementation thus suffers slightly from the drawbacks of other systems. .SH "SEE ALSO" .BR getenv (3C)