In example x19c.c, the callback geolocation_labeler for plslabelfunc has an argument named length which is used only in a call to snprintf. The purpose appears to be to be an input to fix the length of the string formed by snprintf. I can't find where this argument receives a value. Trying to trace the calling chain through the code seems to run in to a dead end pretty quickly. Alternately, how many elements is allocated to the output string, label?
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