curl_getenv - return value for environment name

Added in curl 7.1

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 Windows). You must curl_free(3) the returned string when you are done with it.

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

curl_getenv - return value for environment name

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.

This functionality affects all supported protocols

A pointer to a null-terminated string or NULL if it failed to find the specified name.

getenv(3C) libcurl 2025-06-16 curl_getenv(3)

#include <curl/curl.h> char *curl_getenv(const char *name);