universal-ctags / ctags / 4462

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<a href="https://github.com/universal-ctags/ctags/commit/<a class=hub.com/universal-ctags/ctags/commit/b2e27320f4f9e19e9ba410b2d7b75042f751aac1">b2e27320f<a href="https://github.com/universal-ctags/ctags/commit/b2e27320f4f9e19e9ba410b2d7b75042f751aac1">&quot;&gt;tex: Fix infinite loop parsing an identifier at EOF

This was introduced in </a><a class="double-link" href="https://github.com/universal-ctags/ctags/commit/<a class="double-link" href="https://github.com/universal-ctags/ctags/commit/5d5afe64ca5517c50897164f72db174428961e9f">5d5afe64c</a>">5d5afe64c</a><a href="https://github.com/universal-ctags/ctags/commit/b2e27320f4f9e19e9ba410b2d7b75042f751aac1"> which
started accepting as an identifier character any byte with a value that
cast as `unsigned char` is greater than or equal to 0x80.  The common
value for the `EOF` constant being -1, which cast to `unsigned char`
gives a value of 0xff, hence leading to accepting `EOF` as an
identifier character and then an infinite loop.

Fix it on both sides:

* Don&#39;t perform the cast, as it&#39;s unneeded in this case: `c` is an
  `int` holding the value of an `unsigned char` or `EOF` already, so
  anything equal to or above 0 is a legitimate input character.
* Guard against `EOF` explicitly in the loop.

Fixes #1896.

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