Tektronix Binary File Loader

function loadTEKbinary(filenamestr)
    string filenamestr
    variable fileref
    if (strlen(filenamestr))
        Open  /R /T=".isf" fileref as filenamestr
    else
        Open  /R /T=".isf" fileref
    endif
    if (!(strlen(S_filename)))
        print "Cancelled"
        return 0
    endif
//  string shortname = S_filename[StrSearchBack(S_filename, ":") + 1, strlen(S_filename) - 5]
    string shortname = S_filename[strsearch(S_filename, ":",Inf,1) + 1, strlen(S_filename) - 5]
    string preamble,curvestring
    FreadLine /N=8 fileref, preamble
    if (!stringmatch(preamble, ":WFMPRE:" ))
        print "Missing preamble"
    endif
    FreadLine /T=":" fileref, preamble
//  print preamble
//  The Tek form preamble can be used as a keyword string list with list separator ";" and keyseparator " "
    
    variable delx,ptoff,xzero,ymult,yoff,yzero,sizeitemsnum,numbytes,byteorder,bytetype
    variable numitems
    
    delx = NumberByKey("XINCR", preamble," ",";")
    ptoff = NumberByKey("PT_OFF", preamble," ",";")
    xzero = NumberByKey("XZERO", preamble," ",";")
    
    ymult = NumberByKey("YMULT", preamble," ",";")
    yoff = NumberByKey("YOFF", preamble," ",";")
    yzero = NumberByKey("YZERO", preamble," ",";")
    FreadLine /N=7 fileref, curvestring
    if (!stringmatch(curvestring, "CURVE #" ))
        print "Missing Binary Start String, 'CURVE #'"
        return 0
    endif
    FreadLine /N = 1 fileref, curvestring
    sizeitemsnum = str2num(curvestring)
    FreadLine /N = (sizeitemsnum) fileref, curvestring
    numbytes = str2num(curvestring)
    
    
    strswitch(StringByKey("BYT_OR", preamble," ",";"))  
        case "MSB":     // execute if case matches expression
            byteorder = 2
            break                       // exit from switch
        case "LSB":     // execute if case matches expression
            byteorder = 3
            break
    endswitch
    
    switch(NumberByKey("BYT_NR", preamble," ",";")) 
        case 1:     // execute if case matches expression
            bytetype = 1
            numitems = numbytes
//          make /o /b /n = (numbytes) intwave
            break                       // exit from switch
        case 2:     // execute if case matches expression
            bytetype = 2 
            numitems = numbytes / 2
//          make /o /i /n = (numbytes / 2) intwave
            break
    endswitch
    
    make /o /d /n = (numitems) $shortname
    wave thewave = $shortname
    
    if (stringmatch(StringByKey("BN_FMT", preamble," ",";"),"RI"))
        Fbinread /B=(byteorder) /F=(bytetype) fileref, thewave
    else
        Fbinread /B=(byteorder) /F=(bytetype) /U fileref, thewave
    endif
    
    thewave = (thewave - yoff) * ymult + yzero
    
    SetScale d, -10, 10, StringByKey("YUNIT",preamble," ",";") thewave
    SetScale /P x, (xzero - ptoff *delx), delx, StringByKey("XUNIT",preamble," ",";") thewave
//  SetScale /P x, ptoff, delx, "" thewave
    
    Note /K thewave, StringByKey("WFID",preamble," ",";")
    
    close fileref
    return 1
    
end