Find drive letter for Google File Stream

google-file-stream.c

/*
 * google-file-stream.c
 * Alexandre Alencar
 * alexandre dot alencar at gmail dot com
 * github.com/alencar
 *
 * Compile with: gcc google-file-stream.c -o google-file-stream.exe -Wall
 * Usage:
 *        FOR /F %D IN ('google-file-stream.exe') DO SET GFS=%D
 *        
 * You now know where the Google File Stream is mounted on and can do
 * whatever your want with it.
 */
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>

#define BUFSIZE 512

int main( int argc, char * argv[] ) {

	char lpVolumeNameBuffer[MAX_PATH+1];
	char szTemp[BUFSIZE];
	char szName[MAX_PATH];
	char szDrive[3] = TEXT(" :");
	char *p;
	
	UINT uMode;
	
	/*
	 * Temporary disable media error messages
	 */
	uMode = SetErrorMode(SEM_FAILCRITICALERRORS);
	
	szTemp[0] = '\0';
	/*
	 * Save Logical Drive list
	 */
	if(GetLogicalDriveStrings(BUFSIZE-1, szTemp)){
	   p = szTemp;
	   do {
		   *szDrive = *p;
		   /*
		    * Given a logical drive, does it is available?
			*/
		   if(QueryDosDevice(szDrive, szName, MAX_PATH)){
			   /*
			    * Given a drive letter, does it is Google Drive File Stream?
				*/
		       if(GetVolumeInformation(szDrive, lpVolumeNameBuffer, MAX_PATH+1, NULL, NULL, NULL, NULL, 0)){
				   if(strcmp(lpVolumeNameBuffer, "Google Drive File Stream") == 0){
                      /*
                       * Output the drive letter
                       */
	                  printf("%s", szDrive);
				   }	 
	           }
		   }
		   while(*p++);
	   } while(*p);
	}
	
	/*
	 * Restore media error messages
	 */
	SetErrorMode(uMode);
	
	return 0;
}