relative to absolute path

main.cpp

#include <windows.h>
#include <stdio.h>
#include <string>
#include <map>

	void relative2absolute(std::string& result, const char* relativeFile)
	{
		int state = 0;
		int length = strlen(relativeFile);
		result.reserve(length);
		char* start = const_cast<char*>(relativeFile) + length + 1;
		for( char* x = start - 1; x >= relativeFile; --x ) {							
			if( (*x == '/' || *x == '\\') || x == relativeFile) {					
				char* v; char* sep = x == relativeFile ? x : x + 1; 
				if( sep[0] == '.' && (sep[1] == 0 || sep[1] == '/' || sep[1] == '\\') ) {
					start = x; 
					continue;				
				} else if( x[1] == '/' || x[1] == '\\' ) {
					start = x; 
					continue;	
				} else if( sep[0] == '.' && sep[1] == '.' && (sep[2] == 0 || sep[2] == '/' || sep[2] == '\\') ) {
					state++; //reference count the number of directories to go up
				}
				else
				{
					if( state > 0 ) {
						state--; //decrement reference count of directories to skip
					} else {
						if( x == relativeFile && ( *x == '\\' || *x == '/' ) ) {
							result.insert(0,  x + 1, start - x - 1);
						} else if( *x == '\\' ) {
							result.insert(0,  x + 1, start - x - 1);
							result.insert(0,  "/");
						} else {
							result.insert(0,  x, start - x);
						}					
					}
				}
				
				start = x; 
			}
		}
	}
	
void main()
{
	const char* relativeFile = "/sound//PCFemale_Voice00.gpk_000aebb6.ogg";
	std::string result;
	relative2absolute(result, relativeFile);

	printf("%s\r\n", result.c_str());
	getchar();
}