Port libtransmission to C++. This PR doesn't refactor everything to c++.
Its code changes are only what was necessary to compile and link as c++.
See libtransmission/README.md for details on how to submit modernization
patches!
Co-authored-by: Mike Gelfand <mikedld@mikedld.com>
* refactor: const correctness
* refactor: fix some implicit conversions
* refactor: make local pointers const if their objects are not modified
* refactor: do not cast away const in torrent-cell-renderer
* refactor: remove call to deprecated gtk_icon_size_lookup_for_settings
* refactor: member functions that do not mutate their objects should be declared const
* chore: do not end comments with a semicolon
Since there is no way to mark parameters as [potentially] unused in
standard C and when using MSVC compiler, use the widely accepted
cast-to-void approach instead.
* Switch to new libcurl's polling interface
* Drop unused includes
* Use NOFILE limit value defined by operating system
* Avoid tight loops, ensure blocking for a small timeout
When there are no file descriptors to wait for, select() would work the
same as sleep(). But curl_multi_wait() returns immediately in this case,
so we need to add explicit wait to avoid tight loops.
Documentation: https://curl.haxx.se/libcurl/c/curl_multi_timeout.html
Discussion: https://curl.haxx.se/mail/lib-2018-03/0074.html
* Bump libcurl minimum version to 7.28.0
Assignments explicitly enclosed in parentheses are ignored.
* MISRA C:2004, 13.1 - Assignment operators shall not be used in expressions
that yield a Boolean value
* MISRA C++:2008, 6-2-1 - Assignment operators shall not be used in
sub-expressions
* MISRA C:2012, 13.4 - The result of an assignment operator should not be used
* MITRE, CWE-481 - Assigning instead of Comparing
* CERT, EXP45-C. - Do not perform assignments in selection statements
* CERT, EXP51-J. - Do not perform assignments in conditional expressions
While zlib is mandatory for transmission, it is not mandatory for curl.
A libcurl that has been compiled with no support for zlib will return no data if compressed responses are set to on.
In the basic case this prevents the port checking functionality from working properly. It also prevents web seeding from working as well.
This way all the qualifiers (`const`, `volatile`, `mutable`) are grouped
together, e.g. `T const* const x` vs. `const T* const x`. Also helps reading
types right-to-left, e.g. "constant pointer to constant T" vs. "constant
pointer to T which is constant".
There're places where manual intervention is still required as uncrustify
is not ideal (unfortunately), but at least one may rely on it to do the
right thing most of the time (e.g. when sending in a patch).
The style itself is quite different from what we had before but making it
uniform across all the codebase is the key. I also hope that it'll make the
code more readable (YMMV) and less sensitive to further changes.
Now that MSVC support for C99 is quite good, remove previously needed but
now unused checks and definitions, like PRI* format macros (including
PRIdMAX and TR_PRIuSIZE, replaced with %jd and %zu) and inline macro.
Also, remove ssize_t typedef and replace few occurences with ev_ssize_t.
Also, remove check for stdbool.h availability (guaranteed by C99) and
include it unconditionally (except when in C++ mode).
1. add the option the code to be used under GPLv2 or GPLv3; previously only GPLv2 was allowed
2. add the "proxy option" as described in GPLv3 so we can add future licenses without having to bulk-edit everything again :)
3. remove the awkward "exception for MIT code in Mac client" clause; it was unnecessary and confusing.
Charles Kerr