C snprintf specify user home directory

Question

I use snprintf to write formatted data to disk, but I have one problem, how do I save it to the user\'s home directory?

 snprintf(filename, siz         


        

Answer 1

Use getenv(3) to query the value of the HOME environment variable. For example, this prints my home directory:

#include 
#include 
int main(void) {
    printf("%s\n", getenv("HOME"));
    return 0;
}

You can set your variable filename to the return value, and then write whatever data you want there.

This should work on any Unix-like system, including Linux, macOS, BSD, and probably many more.