The warning itself:
>warning: comparison between pointer and zero character constant [-Wpointer-compare]
Harmless stuff as far as I can tell.
The fix adds a null check that probably isn't needed. The old code that
compared against '\0' worked a lot like a null check so it makes sense
to keep that, while also adding the intended check for empty string.
This was visible with "/dcc close send a" showing an empty filename.
The equivalent for get didn't show the filename in the format string.
Originally found by oss-fuzz (issue 525) in get_ansi_color using ubsan.
After a lot of analysis I'm 99% sure this isn't security relevant so
it's fine to handle this publicly.
The fix is mainly adding a function that does it right and use it
everywhere. This is harder than it seems because the strtol() family of
functions doesn't have the friendliest of interfaces.
Aside from get_ansi_color(), there were other pieces of code that used
the same (out*10+(*in-'0')) pattern, like the parse_size() and
parse_time_interval() functions, which are mostly used for settings.
Those are interesting cases, since they multiply the parsed number
(resulting in more overflows) and they write to a signed integer
parameter (which can accidentally make the uints negative without UB)
Thanks to Pascal Cuoq for enlightening me about the undefined behavior
of parse_size (and, in particular, the implementation-defined behavior
of one of the WIP versions of this commit, where something like signed
integer overflow happened, but it was legal). Also for writing
tis-interpreter, which is better than ubsan to verify these things.
If text is being entered and then the user presses the up arrow
followed by the down arrow, the expected behavior is to return to the
text being entered. Prior to this commit that was not the case.
Fixes#462
It was made redundant by the introduction of the pointer to the GRegex
structure.
Silence the compiler warning in textbuffer.c about preg being
initialized by setting it to NULL.
Otherwise we end up with the message in the status window since the
frontend knows jack shit about the casemapping option when it tries to
find the associated window for the query.
