问题
Is there some C library that implements platform independent version of path operations?
Some examples that come to mind:
- Getting the absolute path from a relative one (without requiring the file to exist)
- Ensuring a directory exists.
- Creating a file if non-existent, and any directory in the given path that is missing.
- Concatenating paths.
- Getting directory part of path.
- Getting filename part of path.
- Lots more....
There are of course platform specific versions of these, but they hardly ever do exactly the same thing leading to chaos trying to match behaviour across platforms.
And I mean C, not C++, so boost doesn't count.
Also if there is none, are there any good sources/examples of differences between platforms, and other useful information that can be used to write such a library?
回答1:
The ever-nice glib family (part of GTK+) has some, at least.
- The misc utility functions API has functions like g_path_is_absolute() and others
- The I/O virtualization wrapper API GIO has g_file_make_directory_with_parents().
Note that some of the functions you're describing, such as "getting absolute path from relative one" assumes the existence of a current directory, which is how that resolution is typically done. It's not a very "pure" function, since it relies on external state. In Windows, with its "split file system", there is even one current directory per volume (e.g. one for C:\, one for A:\ if you have it, and so on) per process.
回答2:
I found the Apache Portable Runtime Project (APR) which does a lot more than just file I/O and path operations. And is not tied to any project like Gnome.
Another project that has portable functions for this with a nice API is CZMQ with the zfile and zsys classes, although the library itself focuses on other things.
回答3:
I know this is a rather old question, but I have been looking for something like this and couldn't find anything. So I wrote one, cwalk (reference) - for anyone who still finds it useful! :-)
来源：https://stackoverflow.com/questions/16355904/is-there-any-cross-platform-file-io-path-util-library-for-c