/*
* vislib::sys::Path::Concatenate
*/
vislib::StringW vislib::sys::Path::Concatenate(const StringW& lhs,
const StringW& rhs, const bool canonicalise) {
StringW retval(lhs);
if (lhs.EndsWith(SEPARATOR_W) && rhs.StartsWith(SEPARATOR_W)) {
retval.Append(rhs.PeekBuffer() + 1);
} else if (!lhs.EndsWith(SEPARATOR_W) && !rhs.StartsWith(SEPARATOR_W)) {
retval.Append(SEPARATOR_W);
retval.Append(rhs);
} else {
retval.Append(rhs);
}
return canonicalise ? Path::Canonicalise(retval) : retval;
}
/*
* vislib::sys::Path::IsRelative
*/
bool vislib::sys::Path::IsRelative(const StringW& path) {
#ifdef _WIN32
return (::PathIsRelativeW(path.PeekBuffer()) != FALSE)
|| path.IsEmpty()
|| ((path.PeekBuffer()[0] == SEPARATOR_W) && (path.PeekBuffer()[1] != SEPARATOR_W));
#else /* _WIN32 */
return !path.StartsWith(SEPARATOR_W);
#endif /* _WIN32 */
}
/*
* vislib::sys::Path::Canonicalise
*/
vislib::StringW vislib::sys::Path::Canonicalise(const StringW& path) {
const StringW DOUBLE_SEPARATOR(Path::SEPARATOR_W, 2);
#ifdef _WIN32
StringW retval;
if (::PathCanonicalizeW(retval.AllocateBuffer(MAX_PATH), path) != TRUE) {
throw SystemException(__FILE__, __LINE__);
}
retval.Replace(DOUBLE_SEPARATOR.PeekBuffer(), SEPARATOR_W);
retval.Replace(DOUBLE_SEPARATOR.PeekBuffer(), SEPARATOR_W);
/* Ensure that a UNC path remains a UNC path. */
if (path.StartsWith(DOUBLE_SEPARATOR)) {
// Note: Double separator replacement above leaves at least one
// separator, so we must only prepend one additional one.
retval.Prepend(SEPARATOR_W);
}
return retval;
#else /* _WIN32 */
const wchar_t *BACK_REF = L"/..";
const wchar_t *CUR_REF = L"/."; // Note: "./" does not work
StringW::Size BACK_REF_LEN = ::wcslen(BACK_REF);
StringW::Size bwRefPos = 0; // Position of back reference.
StringW::Size remDirPos = 0; // Position of directory to erase.
StringW retval(path);
/* Remove backward references, first. */
while ((bwRefPos = retval.Find(BACK_REF)) != StringW::INVALID_POS) {
if ((bwRefPos > 0)
&& (remDirPos = retval.FindLast(SEPARATOR_W, bwRefPos - 1))
!= StringW::INVALID_POS) {
/* Found inner backward reference, so remove some parts. */
retval.Remove(remDirPos, bwRefPos - remDirPos + BACK_REF_LEN);
} else {
/*
* No other path separator is before this one, so we can remove
* everything before 'bwRefPos'.
*/
retval.Remove(0, bwRefPos + BACK_REF_LEN);
}
}
/*
* Remove references to the current directory. This must be done after
* removing backward references.
*/
retval.Remove(CUR_REF);
/* Remove odd and even number of repeated path separators. */
retval.Replace(DOUBLE_SEPARATOR.PeekBuffer(), SEPARATOR_W);
retval.Replace(DOUBLE_SEPARATOR.PeekBuffer(), SEPARATOR_W);
return retval;
#endif /* _WIN32 */
}