C++ equivalent of MATLAB's "fileparts" function - c++

Question

In MATLAB there's a nice function called fileparts that takes a full file path and parses it into path, filename (without extension), and extension as in the following example from the documentation:
file = 'H:\user4\matlab\classpath.txt';
[pathstr, name, ext] = fileparts(file)
>> pathstr = H:\user4\matlab
>> name = classpath
>> ext = .txt
So I was wondering if there's an equivalent function in any standard C++ or C libraries that I could use? Or would I have to implement this myself? I realize it's fairly simple, but I figured if there's already something pre-made that would be preferable.
Thanks.

Answer 1

The boost library has a file system component "basic_path" that allows you use iterators to discover each component in the filename. Such a component would be OS specific, and I believe you need to compile boost separately for Windows, Linux etc.

Answer 2

I just wrote this simple function. It behaves similar as Matlab's fileparts and works independent of platform.
struct FileParts
{
string path;
string name;
string ext;
};
FileParts fileparts(string filename)
{
int idx0 = filename.rfind("/");
int idx1 = filename.rfind(".");
FileParts fp;
fp.path = filename.substr(0,idx0+1);
fp.name = filename.substr(idx0+1,idx1-idx0-1);
fp.ext = filename.substr(idx1);
return fp;
}

Answer 3

A platform-independent way with C++11/14.
#include <experimental/filesystem>
namespace fs = std::experimental::filesystem;
void fileparts(string full, string& fpath, string& fname, string& fext)
{
auto source = fs::path(full);
fpath = source.parent_path().string();
fname = source.stem().string();
fext = source.extension().string();
}
...
string fpath, fname, fext;
fileparts(full_file_path,fpath,fname,fext);

Answer 4

Some possible solutions, depending on your OS:
Visual C++ _splitpath function
Win32 Shell Path Handling Functions such as PathFindExtension, PathFindFileName, PathStripPath, PathRemoveExtension, PathRemoveFileSpec

Answer 5

Ekalic's text-only approach is useful, but it didn't check for errors. Here's one that does, and also works with both / and \
struct FileParts
{
std::string path; //!< containing folder, if provided, including trailing slash
std::string name; //!< base file name, without extension
std::string ext; //!< extension, including '.'
};
//! Using only text manipulation, splits a full path into component file parts
FileParts fileparts(const std::string &fullpath)
{
using namespace std;
size_t idxSlash = fullpath.rfind("/");
if (idxSlash == string::npos) {
idxSlash = fullpath.rfind("\\");
}
size_t idxDot = fullpath.rfind(".");
FileParts fp;
if (idxSlash != string::npos && idxDot != string::npos) {
fp.path = fullpath.substr(0, idxSlash + 1);
fp.name = fullpath.substr(idxSlash + 1, idxDot - idxSlash - 1);
fp.ext = fullpath.substr(idxDot);
} else if (idxSlash == string::npos && idxDot == string::npos) {
fp.name = fullpath;
} else if (/* only */ idxSlash == string::npos) {
fp.name = fullpath.substr(0, idxDot);
fp.ext = fullpath.substr(idxDot);
} else { // only idxDot == string::npos
fp.path = fullpath.substr(0, idxSlash + 1);
fp.name = fullpath.substr(idxSlash + 1);
}
return fp;
}