We want to expose the AudioFormat structure to plugins; remove some
clutter by moving its declaration to a separate header file.

Also enable -Wunused-parameter - this forces us to add the gcc
"unused" attribute to a lot of parameters (mostly library callback
functions), but it's worth it during code refactorizations.

We have revision control for a reason :)

git-svn-id: https://svn.musicpd.org/mpd/trunk@7357 09075e82-0dd4-0310-85a5-a0d7c8717e4f

Try to only include headers which are really needed.  We should
particularly check all "headers including other headers".  The
long-term goal is to have a manageable, small API for plugins
(decoders, output) without so many mpd internals cluttering the
namespace.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7319 09075e82-0dd4-0310-85a5-a0d7c8717e4f

Local variables which are never read before the first assignment don't
need initialization.  Saves a few bytes of text.  Also don't reset
variables which are never read until function return.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7199 09075e82-0dd4-0310-85a5-a0d7c8717e4f

[ew: cleaned up the dirty union hack a bit]
Signed-off-by: Eric Wong <normalperson@yhbt.net>

git-svn-id: https://svn.musicpd.org/mpd/trunk@7180 09075e82-0dd4-0310-85a5-a0d7c8717e4f

It's too ugly and broken (both technically and usability-wise)
to be worth supporting in any stable release.

In one sentence: The queue is a very crippled version of the
playlist that takes precedence over the normal playlist.

How is it crippled?

* The "queueid" command only allows the queuing of songs
ALREADY IN THE PLAYLIST!  This promotes having the entire mpd
database of songs in the playlist, which is a stupid practice
to begin with.

* It doesn't allow for meaningful rearranging and movement
of songs within the queue.  To move a song, you'd need to
dequeue and requeue it (and other songs on the list).
Why?  The playlist already allows _all_ these features
and shows everything a client needs to know about the ordering
of songs in a _single_ command!

* Random was a stupid idea to begin with and unfortunately
we're stuck supporting it since we've always had it.  Users
should learn to use "shuffle" instead and not look at their
playlists.  Implementing queue because we have the problem of
random is just a bandage fix and digging ourselves a new hole.

This protocol addition was never in a stable release of mpd, so
reverting it will only break things for people following trunk;
which I'm not too worried about.  I am however worried about
long-term support of this misfeature, so I'm removing it.

Additionally, there are other points:

* It's trivially DoS-able:

(while true; do echo queueid $song_id; done) | nc $MPD_HOST $MPD_PORT

The above commands would cause the queue to become infinitely
expanding, taking up all available memory in the system.  The
mpd playlist was implemented as an array with a fixed (but
configurable) size limit for this reason.

* It's not backwards-compatible.  All clients would require
upgrades (and additional complexity) to even know what the
next song in the playlist is.  mpd is a shared architecture,
and we should not violate the principle of least astonishment
here.

This removes the following commands:
queueid, dequeue, queueinfo

Additionally, the status field of "playlistqueue: " is removed
from the status command.

While this DoS is trivial to fix, the design is simply too
broken to ever support in a real release.

The overloading of the "addid" command and the allowing of
negative numbers to be used as offsets is far more flexible.

This improved "addid" is completely backwards-compatible with
all clients, and does not require clients to have UI changes or
run additional commands to display the queue.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7155 09075e82-0dd4-0310-85a5-a0d7c8717e4f

This will allow "addid \"song_url\" <pos>" to atomically insert a
song at any given playlist position.

If the add succeeds, but the actual movement fails (due to
invalid position), then the song_id will be deleted before
the command returns back to the client, and the client
will get an error response.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7151 09075e82-0dd4-0310-85a5-a0d7c8717e4f

git-svn-id: https://svn.musicpd.org/mpd/trunk@7150 09075e82-0dd4-0310-85a5-a0d7c8717e4f

Instead of printing out the Id from playlist.c, instead set
the integer that added_id poitns to if added_id is non-NULL.

This makes the API cleaner and will allow us to use additional
commands to manipulate the newly-added song_id.  Callers
(handleAddId) that relied on printId to print it to the given
fd have now been modified to print the ID at a higher-level;
making playlist.c less-dependent on protocol details.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7149 09075e82-0dd4-0310-85a5-a0d7c8717e4f

Signed-off-by: Eric Wong <normalperson@yhbt.net>

git-svn-id: https://svn.musicpd.org/mpd/trunk@7143 09075e82-0dd4-0310-85a5-a0d7c8717e4f

This will make refactoring features easier, especially now that
pthreads support and larger refactorings are on the horizon.

Hopefully, this will make porting to other platforms (even
non-UNIX-like ones for masochists) easier, too.

os_compat.h will house all the #includes for system headers
considered to be the "core" of MPD.  Headers for optional
features will be left to individual source files.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7130 09075e82-0dd4-0310-85a5-a0d7c8717e4f

This adds the following commands:
* queueid <id>		Add song <id> to the queue.
* dequeue <pos>		Remove song from <pos> from the queue
* queueinfo			List the queue

To the statusfield it adds the following entry:
playlistqueue:	<uid>		UID can be used by clients to track changes in the playlist queue.



git-svn-id: https://svn.musicpd.org/mpd/trunk@6927 09075e82-0dd4-0310-85a5-a0d7c8717e4f

git-svn-id: https://svn.musicpd.org/mpd/trunk@6246 09075e82-0dd4-0310-85a5-a0d7c8717e4f

can't be loaded anyway).

git-svn-id: https://svn.musicpd.org/mpd/trunk@6244 09075e82-0dd4-0310-85a5-a0d7c8717e4f

new commands: playlistmove and playlistdelete.

git-svn-id: https://svn.musicpd.org/mpd/trunk@6116 09075e82-0dd4-0310-85a5-a0d7c8717e4f

returning a list of matching songs, the number of results and total play
time of the results are returned.

git-svn-id: https://svn.musicpd.org/mpd/trunk@5950 09075e82-0dd4-0310-85a5-a0d7c8717e4f

NULL.  Doing so would mean future calls to commandError with a socket as an
argument will still write the error message to the error log, and not the
socket.

git-svn-id: https://svn.musicpd.org/mpd/trunk@5891 09075e82-0dd4-0310-85a5-a0d7c8717e4f

message and trailing new line to STDERR_FILENO along with the ACK, instead
of sending them over the socket.

git-svn-id: https://svn.musicpd.org/mpd/trunk@5890 09075e82-0dd4-0310-85a5-a0d7c8717e4f

git-svn-id: https://svn.musicpd.org/mpd/trunk@5834 09075e82-0dd4-0310-85a5-a0d7c8717e4f

into account).

git-svn-id: https://svn.musicpd.org/mpd/trunk@5792 09075e82-0dd4-0310-85a5-a0d7c8717e4f

playlist.

git-svn-id: https://svn.musicpd.org/mpd/trunk@5420 09075e82-0dd4-0310-85a5-a0d7c8717e4f

Some compilers and linkers aren't smart enough to optimize this,
as global variables are implictly initialized to zero.  As a
result, binaries are a bit smaller as more goes in the .bss and
less in the text section.

git-svn-id: https://svn.musicpd.org/mpd/trunk@5254 09075e82-0dd4-0310-85a5-a0d7c8717e4f

git-svn-id: https://svn.musicpd.org/mpd/trunk@5139 09075e82-0dd4-0310-85a5-a0d7c8717e4f

git-svn-id: https://svn.musicpd.org/mpd/trunk@5128 09075e82-0dd4-0310-85a5-a0d7c8717e4f

git-svn-id: https://svn.musicpd.org/mpd/trunk@4875 09075e82-0dd4-0310-85a5-a0d7c8717e4f

Warren's fix in r4872 made phpMp work again, but also broke
the unit tests completely (they work in this version).

The version in 0.12.0 is far too buggy (it was from mpd-ke, what
do you expect?).  This one passes all the unit tests that the
mpd-ke one passed, and should also work with phpMp when used
with PHP magic quotes.

This also means we can search on 100 (or more) tags at once, so
no more arbitrary limits other than system memory.

To run the unit tests, just do this:
gcc -o t -DUNIT_TEST=1 src/buffer2array.c && ./t && echo OK

git-svn-id: https://svn.musicpd.org/mpd/trunk@4874 09075e82-0dd4-0310-85a5-a0d7c8717e4f

I'm checking for zero-size allocations and assert()-ing them,
so we can more easily get backtraces and debug problems, but we'll
also allow -DNDEBUG people to live on the edge if they wish.

We do not rely on errno when checking for OOM errors because
some implementations of malloc do not set it, and malloc
is commonly overridden by userspace wrappers.

I've spent some time looking through the source and didn't find any
obvious places where we would explicitly allocate 0 bytes, so we
shouldn't trip any of those assertions.

We also avoid allocating zero bytes because C libraries don't
handle this consistently (some return NULL, some not); and it's
dangerous either way.

git-svn-id: https://svn.musicpd.org/mpd/trunk@4690 09075e82-0dd4-0310-85a5-a0d7c8717e4f

leave out initCommands to keep jat happy, and keep labels
at the left hand side

git-svn-id: https://svn.musicpd.org/mpd/trunk@4687 09075e82-0dd4-0310-85a5-a0d7c8717e4f

Add -Wmissing-prototypes if compiling with gcc
Static where possible

git-svn-id: https://svn.musicpd.org/mpd/trunk@4657 09075e82-0dd4-0310-85a5-a0d7c8717e4f

git-svn-id: https://svn.musicpd.org/mpd/trunk@4593 09075e82-0dd4-0310-85a5-a0d7c8717e4f

git-svn-id: https://svn.musicpd.org/mpd/trunk@4583 09075e82-0dd4-0310-85a5-a0d7c8717e4f

git-svn-id: https://svn.musicpd.org/mpd/trunk@4582 09075e82-0dd4-0310-85a5-a0d7c8717e4f

git-svn-id: https://svn.musicpd.org/mpd/trunk@4575 09075e82-0dd4-0310-85a5-a0d7c8717e4f

renamce cstrtok to buffer2array. please don't rename functions; especially to names that look extremely std-lib-ish.  also, don't use isspace, apparently it's local dependent and potentially consideres ' ' or '\t' not to be a space, or considers other characters to be a space.

git-svn-id: https://svn.musicpd.org/mpd/trunk@4574 09075e82-0dd4-0310-85a5-a0d7c8717e4f

git-svn-id: https://svn.musicpd.org/mpd/trunk@4489 09075e82-0dd4-0310-85a5-a0d7c8717e4f

stripped binary size reduced by 9k on my machine from making
commandError a function.  We'll print out error messages slightly
slower before, but the smaller binary is more than worth it.

git-svn-id: https://svn.musicpd.org/mpd/trunk@4488 09075e82-0dd4-0310-85a5-a0d7c8717e4f

The most we ever use is for search/find, and that limits it to the
number of tags we can have.  Add one for the command, and one extra
to catch errors clients may send us.

Thanks to Qball for reporting this bug

git-svn-id: https://svn.musicpd.org/mpd/trunk@4486 09075e82-0dd4-0310-85a5-a0d7c8717e4f

This patch massively reduces the amount of heap allocations at
the interface/command layer.  Most commands with minimal output
should not allocate memory from the heap at all.  Things like
repeatedly polling status, currentsong, and volume changes
should be faster as a result, and more importantly, not a source
of memory fragmentation.

These changes should be safe in that there's no way for a
remote-client to corrupt memory or otherwise do bad stuff to
MPD, but an extra set of eyes to review would be good.  Of
course there's never any warranty :)

No longer do we use FILE * structures in the interface, which means
we don't have to allocate any new memory for most connections.

Now, before you go on about losing the buffering that FILE *
+implies+, remember that myfprintf() never took advantage of
any of the stdio buffering features.

To reduce the diff and make bugs easier to spot in the diff,
I've kept myfprintf in places where we write to files (and not
network interfaces).  Expect myfprintf to go away entirely soon
(we'll use fprintf for writing regular files).

git-svn-id: https://svn.musicpd.org/mpd/trunk@4483 09075e82-0dd4-0310-85a5-a0d7c8717e4f

This modifies the string in place, and does not allocate any memory from
the heap.  This is considerably smaller than the function it replaces,
and will be instrumental in getting the commands/conf malloc reductions
done.

git-svn-id: https://svn.musicpd.org/mpd/trunk@4481 09075e82-0dd4-0310-85a5-a0d7c8717e4f