[XeTeX] Test for font presence

[Ron Aaron]

Came up with the following:

    \newif\iffontexists
    \def\fontexists#1{
       \fontexistsfalse
       \batchmode
       \font\tstfnt="#1"
       \errorstopmode
       \ifnum\strcmp{\fontname\tstfnt}{"#1"}=0
          \fontexiststrue
       \fi
    }




It works, but is there an easier way?
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