1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: curl_getenv 5Section: 3 6Source: libcurl 7See-also: 8 - getenv (3C) 9Protocol: 10 - All 11Added-in: 7.1 12--- 13 14# NAME 15 16curl_getenv - return value for environment name 17 18# SYNOPSIS 19 20~~~c 21#include <curl/curl.h> 22 23char *curl_getenv(const char *name); 24~~~ 25 26# DESCRIPTION 27 28curl_getenv() is a portable wrapper for the getenv() function, meant to 29emulate its behavior and provide an identical interface for all operating 30systems libcurl builds on (including Windows). 31 32You must curl_free(3) the returned string when you are done with it. 33 34# %PROTOCOLS% 35 36# EXAMPLE 37 38~~~c 39int main(void) 40{ 41 char *width = curl_getenv("COLUMNS"); 42 if(width) { 43 /* it was set */ 44 curl_free(width); 45 } 46} 47~~~ 48 49# %AVAILABILITY% 50 51# RETURN VALUE 52 53A pointer to a null-terminated string or NULL if it failed to find the 54specified name. 55 56# NOTE 57 58Under Unix operating systems, there is no point in returning an allocated 59memory, although other systems does not work properly if this is not done. The 60Unix implementation thus suffers slightly from the drawbacks of other systems. 61
