Question

Can someone guide me on a possible solution? I don’t want to use /bin/cp or any other foreign apps. I want my program to be independent. Also I know that every system is quite specific, so I’m interested in UNIX/Linux compatibility.

How can I solve it? Just going down the source directory and creating a new directories in the target one and copying files in them, or there is a better solution?

BTW my goal is: copy all first level subdirs recursively into target dir if they are not present there

Answer 1

You really need some kind of recursive descent into the directory tree. Doing this, you can actually make this very portable (using opendir/readdir on Linux and FindFirstFile/FindNextFile on Windows). The problem that remains is the actual copying. You can use the C standard library for that with the following algorithm:

• Open source file
• Open target file
• In a loop, fread a block of constant size from the source, then fwrite it to the target. Stop if the source file contains no more data

Hope this helps 🙂