joinpath.cpp
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joinpath.cpp
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	#include "common/joinpath.h"
	#include <sstream>
	#include <vector>
	#include <cstring>

	#ifdef WIN32
	#pragma warning(disable:4996)
	#endif

	template <typename T> static inline void trimquot(T const begin, T const end)
	{
	if (begin + 1 < end && (begin)[0] == '"' && (end)[-1] == '"') {
	(*begin)++;
	(*end)--;
	}
	}

	template <typename T, typename U> void joinpath_(T const left, T const right, U *vec)
	{
	size_t llen = 0;
	size_t rlen = 0;
	if (left) {
	T const *leftend = left + std::char_traits<T>::length(left);
	trimquot(&left, &leftend);
	while (left < leftend && (leftend[-1] == '/' \|\| leftend[-1] == '\\')) {
	leftend--;
	}
	llen = leftend - left;
	}
	if (right) {
	T const *rightend = right + std::char_traits<T>::length(right);
	trimquot(&right, &rightend);
	while (right < rightend && (right[0] == '/' \|\| right[0] == '\\')) {
	right++;
	}
	rlen = rightend - right;
	}
	vec->resize(llen + 1 + rlen);
	if (llen > 0) {
	std::char_traits<T>::copy(&vec->at(0), left, llen);
	}
	vec->at(llen) = '/';
	if (rlen > 0) {
	std::char_traits<T>::copy(&vec->at(llen + 1), right, rlen);
	}
	}

	std::string joinpath(char const left, char const right)
	{
	std::vector<char> vec;
	joinpath_(left, right, &vec);
	return std::string(vec.begin(), vec.end());
	}

	std::string joinpath(std::string const &left, std::string const &right)
	{
	return joinpath(left.c_str(), right.c_str());
	}

	QString qjoinpath(ushort const left, ushort const right)
	{
	std::vector<ushort> vec;
	joinpath_(left, right, &vec);
	if (vec.empty()) return QString();
	return QString::fromUtf16(&vec[0], vec.size());
	}