Akim Demaille d120a07e6b diagnostics: beware of unexpected EOF when quoting the source file ...

When the input file contains lone CRs (aka, ^M, \r), the locations see
a new line.  Diagnostics look only at \n as end-of-line, so sometimes
there is an offset in diagnostics.  Worse yet: sometimes we loop
endlessly waiting for \n to come from a continuous stream of EOF.

Fix that:
- check for EOF
- beware not to call end_use_class if begin_use_class was not
  called (which would abort).  This could happen if the actual
  line is shorter that the expected one.

Prompted by a (private) report from Marc Schönefeld.

* src/location.c (location_caret): here.
* tests/diagnostics.at (Carriage return): New.

2019-09-10 19:15:18 +02:00

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