make
The current status of this entry is:
STATUS: INABIAF - please **DO NOT** fix
For more detailed information see 2012 deckmyn bugs.
./deckmyn "$(cat deckmyn.c)" "$(cat musicfile.txt)" > sheetmusic.pbm
./try.sh
The C of this entry is definitely sharp. The program cleverly uses its own source at runtime to define the notes, time signature and accidental bitmaps.
In addition to sheet music, this program is also able to, given the right input, generate an image of a 10-pin DIP chip (a sound processor?).
We previously wrote that ironically, the way this entry is called from the command line is an abuse of C Shell. Please use Bourne-family shells to run this entry.
… but in 2023 we changed the backticks to be the bash $(..)
construct. This
is not done in the author’s remarks, however.
You need the source code and example input (either one of the example files, or manual input as below) ready and a program capable of showing .pbm bitmap format images.
./deckmyn "`cat deckmyn.c`" "`cat example_greensleeves`" > greensleeves.pbm
If you have macOS you can open the image like:
open greensleeves.pbm
… otherwise, you’ll have to open it in your viewer of choice how you would normally open an image.
./deckmyn "`cat deckmyn.c`" "KF m44c4 c4 g4 g4 : a4 a4 g2 :; " > short_bass.pbm
If you have macOS you can open the image like:
open short_bass.pbm
… otherwise, you’ll have to open it in your viewer of choice how you would normally open an image.
Every major C competition should have an entry capable of producing C major.
This is a music notation program. It produces
bitmaps (.pbm
) of music based on ASCII
input. A full manual is added as a separate file. Some musical
examples are also included.
The program is capable of printing notes, rests, (double) bar lines and accidentals on a single melodic line (multiple staves). No chords, polyphony etc.
The program expects two command line arguments. The first is a (very long)
string that contains the complete music font. Note that it should not be given
as a file name! The default music font is encoded in the (whitespace of the)
source code deckmyn.c itself. Therefore, the first argument should
be "``
cat deckmyn.c
``"
.
The second command line argument is the music itself. This is, again, a string, not a file name. All music signs are entered as tokens of exactly 3 characters. The code is very sensitive to bad spacing! So for instance, if you use a file to write the music (e.g. example_greensleeves), you should keep in mind that newline is also a character!
To minimise the memory footprint, this program has no variable declarations at
all, except for the arguments to main()
. The only available memory space is
from the command line arguments and count (argv
and argc
). Parts of argv
are cast as int
when values under 0 or beyond 127 are expected.
The “music font” is defined by the source code itself. The first few lines are not part of the font definition, as this memory space will be modified by the program. (So as required by the rules, it is only a (memory) copy of the source code that is modified.)
As there is no memory available, output is directly to stdout
, byte by byte,
from the top left to the bottom right pixel.
The memory locations of argv
are used for various purposes. Therefore, the
program name (default deckmyn
) must be at least 4 characters long, including
possibly the path. This, along with the ending '\0'
, gives minimum 5 bytes of
useful memory space. Otherwise, the program may attempt to write outside the
string.
The code is quite sensitive. Errors in the input can lead to strange results. The code does not read beyond the end of the music input, but that is about the only error checking available. Any input that is not according to the rules in the manual, may cause errors.
The program has no special hardware limitations or requirements, other than 8bit
char
(signed
or unsigned
) and two’s complement negatives.
The limitations of using char
as counters for e.g. the number of music staves
are minor. 127 staves to a page is rather a lot.
The code has no declared variables other than the command line variables. Not
even pointers (we all know how messy code can get with too many pointers!). As
more than one variable needs values beyond 127, parts of the command line memory
are cast to int
using a macro.
argv
/argc
as memory locations is a matter of reducing the
memory footprint. Again, it is not an obfuscation.c
and C
,
is merely a matter of conforming to the standard
WYSIWYG paradigm common in commercial
notation programs (’What You C
is What You Get). So once again it is not an
obfuscation. Anyway, it’s a C coding contest, right?argv
are addressed is a matter of
maintaining a diversified code base. It is therefore not… Oh all right.printf(3)
call including a 800+
character nested conditional expression.printf()
is also used for its return value.