Function urlEncode

Source/3rdParty/bx/src/url.cpp:125–155

https://secure.wikimedia.org/wikipedia/en/wiki/URL_encoding

	// https://secure.wikimedia.org/wikipedia/en/wiki/URL_encoding
	void urlEncode(char* _out, uint32_t _max, const StringView& _str)
	{
		_max--; // need space for zero terminator

		const char* str  = _str.getPtr();
		const char* term = _str.getTerm();

		uint32_t ii = 0;
		for (char ch = *str++
			; str <= term && ii < _max
			; ch = *str++
			)
		{
			if (isAlphaNum(ch)
			||  ch == '-'
			||  ch == '_'
			||  ch == '.'
			||  ch == '~')
			{
				_out[ii++] = ch;
			}
			else if (ii+3 < _max)
			{
				_out[ii++] = '%';
				_out[ii++] = toHex(ch>>4);
				_out[ii++] = toHex(ch);
			}
		}

		_out[ii] = '\0';
	}

} // namespace bx