strupr

char *__cdecl strupr(char *String){
  char v3; 
  char *v4; 

  if( String )
  {
    v3 = *String;
    v4 = String;
    while( v3 )
    {
      if( (unsigned __int8)(v3 - 97) <= 0x19u )
        *v4 = v3 - 32;
      v3 = *++v4;
    }
    return String;
  }
  else
  {
    xHalTimerWatchdogStop(0i64, 0i64);
    return 0i64;
  }
}

Referenced by:

BvgaDriverInitialize
HalInitializeBios
InbvDetermineFunction
InbvDriverInitialize
InitBootProcessor
KdInitSystem
RamdiskStart