ansi: show ANSI art in a UTF-8 terminal, or as plain or shaded text
Draws an .ans file into a grid the way an ANSI-BBS terminal would (cursor moves, the wrap at the SAUCE width, iCE colours) and writes it out as UTF-8: in colour, --plain, or --mono with coloured areas shaded by brightness. info prints the SAUCE record. One C99 file with no dependencies.
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ansi
|
||||
@@ -0,0 +1,338 @@
|
||||
GNU GENERAL PUBLIC LICENSE
|
||||
Version 2, June 1991
|
||||
|
||||
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
|
||||
<https://fsf.org/>
|
||||
Everyone is permitted to copy and distribute verbatim copies
|
||||
of this license document, but changing it is not allowed.
|
||||
|
||||
Preamble
|
||||
|
||||
The licenses for most software are designed to take away your
|
||||
freedom to share and change it. By contrast, the GNU General Public
|
||||
License is intended to guarantee your freedom to share and change free
|
||||
software--to make sure the software is free for all its users. This
|
||||
General Public License applies to most of the Free Software
|
||||
Foundation's software and to any other program whose authors commit to
|
||||
using it. (Some other Free Software Foundation software is covered by
|
||||
the GNU Lesser General Public License instead.) You can apply it to
|
||||
your programs, too.
|
||||
|
||||
When we speak of free software, we are referring to freedom, not
|
||||
price. Our General Public Licenses are designed to make sure that you
|
||||
have the freedom to distribute copies of free software (and charge for
|
||||
this service if you wish), that you receive source code or can get it
|
||||
if you want it, that you can change the software or use pieces of it
|
||||
in new free programs; and that you know you can do these things.
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||||
|
||||
To protect your rights, we need to make restrictions that forbid
|
||||
anyone to deny you these rights or to ask you to surrender the rights.
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These restrictions translate to certain responsibilities for you if you
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distribute copies of the software, or if you modify it.
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||||
For example, if you distribute copies of such a program, whether
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gratis or for a fee, you must give the recipients all the rights that
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||||
you have. You must make sure that they, too, receive or can get the
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source code. And you must show them these terms so they know their
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rights.
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||||
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We protect your rights with two steps: (1) copyright the software, and
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(2) offer you this license which gives you legal permission to copy,
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distribute and/or modify the software.
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Also, for each author's protection and ours, we want to make certain
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Finally, any free program is threatened constantly by software
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The precise terms and conditions for copying, distribution and
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||||
modification follow.
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||||
GNU GENERAL PUBLIC LICENSE
|
||||
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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|
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0. This License applies to any program or other work which contains
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a notice placed by the copyright holder saying it may be distributed
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||||
under the terms of this General Public License. The "Program", below,
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refers to any such program or work, and a "work based on the Program"
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means either the Program or any derivative work under copyright law:
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that is to say, a work containing the Program or a portion of it,
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either verbatim or with modifications and/or translated into another
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language. (Hereinafter, translation is included without limitation in
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||||
the term "modification".) Each licensee is addressed as "you".
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|
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Activities other than copying, distribution and modification are not
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covered by this License; they are outside its scope. The act of
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running the Program is not restricted, and the output from the Program
|
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is covered only if its contents constitute a work based on the
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Program (independent of having been made by running the Program).
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Whether that is true depends on what the Program does.
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1. You may copy and distribute verbatim copies of the Program's
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conspicuously and appropriately publish on each copy an appropriate
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and give any other recipients of the Program a copy of this License
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||||
You may charge a fee for the physical act of transferring a copy, and
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you may at your option offer warranty protection in exchange for a fee.
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2. You may modify your copy or copies of the Program or any portion
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distribute such modifications or work under the terms of Section 1
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||||
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|
||||
a) You must cause the modified files to carry prominent notices
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stating that you changed the files and the date of any change.
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b) You must cause any work that you distribute or publish, that in
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part thereof, to be licensed as a whole at no charge to all third
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c) If the modified program normally reads commands interactively
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interactive use in the most ordinary way, to print or display an
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|
||||
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License. (Exception: if the Program itself is interactive but
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These requirements apply to the modified work as a whole. If
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distribute the same sections as part of a whole which is a work based
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||||
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|
||||
Thus, it is not the intent of this section to claim rights or contest
|
||||
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exercise the right to control the distribution of derivative or
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||||
collective works based on the Program.
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||||
|
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In addition, mere aggregation of another work not based on the Program
|
||||
with the Program (or with a work based on the Program) on a volume of
|
||||
a storage or distribution medium does not bring the other work under
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||||
the scope of this License.
|
||||
|
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3. You may copy and distribute the Program (or a work based on it,
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under Section 2) in object code or executable form under the terms of
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||||
Sections 1 and 2 above provided that you also do one of the following:
|
||||
|
||||
a) Accompany it with the complete corresponding machine-readable
|
||||
source code, which must be distributed under the terms of Sections
|
||||
1 and 2 above on a medium customarily used for software interchange; or,
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||||
|
||||
b) Accompany it with a written offer, valid for at least three
|
||||
years, to give any third party, for a charge no more than your
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||||
cost of physically performing source distribution, a complete
|
||||
machine-readable copy of the corresponding source code, to be
|
||||
distributed under the terms of Sections 1 and 2 above on a medium
|
||||
customarily used for software interchange; or,
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||||
|
||||
c) Accompany it with the information you received as to the offer
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||||
to distribute corresponding source code. (This alternative is
|
||||
allowed only for noncommercial distribution and only if you
|
||||
received the program in object code or executable form with such
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an offer, in accord with Subsection b above.)
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|
||||
The source code for a work means the preferred form of the work for
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making modifications to it. For an executable work, complete source
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code means all the source code for all modules it contains, plus any
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anything that is normally distributed (in either source or binary
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operating system on which the executable runs, unless that component
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itself accompanies the executable.
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||||
If distribution of executable or object code is made by offering
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||||
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||||
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||||
distribution of the source code, even though third parties are not
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compelled to copy the source along with the object code.
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||||
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||||
4. You may not copy, modify, sublicense, or distribute the Program
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||||
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||||
void, and will automatically terminate your rights under this License.
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||||
However, parties who have received copies, or rights, from you under
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||||
this License will not have their licenses terminated so long as such
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parties remain in full compliance.
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|
||||
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signed it. However, nothing else grants you permission to modify or
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distribute the Program or its derivative works. These actions are
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||||
prohibited by law if you do not accept this License. Therefore, by
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modifying or distributing the Program (or any work based on the
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||||
all its terms and conditions for copying, distributing or modifying
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the Program or works based on it.
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||||
|
||||
6. Each time you redistribute the Program (or any work based on the
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||||
Program), the recipient automatically receives a license from the
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original licensor to copy, distribute or modify the Program subject to
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||||
these terms and conditions. You may not impose any further
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restrictions on the recipients' exercise of the rights granted herein.
|
||||
You are not responsible for enforcing compliance by third parties to
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||||
this License.
|
||||
|
||||
7. If, as a consequence of a court judgment or allegation of patent
|
||||
infringement or for any other reason (not limited to patent issues),
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||||
conditions are imposed on you (whether by court order, agreement or
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||||
otherwise) that contradict the conditions of this License, they do not
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||||
excuse you from the conditions of this License. If you cannot
|
||||
distribute so as to satisfy simultaneously your obligations under this
|
||||
License and any other pertinent obligations, then as a consequence you
|
||||
may not distribute the Program at all. For example, if a patent
|
||||
license would not permit royalty-free redistribution of the Program by
|
||||
all those who receive copies directly or indirectly through you, then
|
||||
the only way you could satisfy both it and this License would be to
|
||||
refrain entirely from distribution of the Program.
|
||||
|
||||
If any portion of this section is held invalid or unenforceable under
|
||||
any particular circumstance, the balance of the section is intended to
|
||||
apply and the section as a whole is intended to apply in other
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||||
circumstances.
|
||||
|
||||
It is not the purpose of this section to induce you to infringe any
|
||||
patents or other property right claims or to contest validity of any
|
||||
such claims; this section has the sole purpose of protecting the
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integrity of the free software distribution system, which is
|
||||
implemented by public license practices. Many people have made
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||||
generous contributions to the wide range of software distributed
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||||
through that system in reliance on consistent application of that
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||||
system; it is up to the author/donor to decide if he or she is willing
|
||||
to distribute software through any other system and a licensee cannot
|
||||
impose that choice.
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||||
|
||||
This section is intended to make thoroughly clear what is believed to
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||||
be a consequence of the rest of this License.
|
||||
|
||||
8. If the distribution and/or use of the Program is restricted in
|
||||
certain countries either by patents or by copyrighted interfaces, the
|
||||
original copyright holder who places the Program under this License
|
||||
may add an explicit geographical distribution limitation excluding
|
||||
those countries, so that distribution is permitted only in or among
|
||||
countries not thus excluded. In such case, this License incorporates
|
||||
the limitation as if written in the body of this License.
|
||||
|
||||
9. The Free Software Foundation may publish revised and/or new versions
|
||||
of the General Public License from time to time. Such new versions will
|
||||
be similar in spirit to the present version, but may differ in detail to
|
||||
address new problems or concerns.
|
||||
|
||||
Each version is given a distinguishing version number. If the Program
|
||||
specifies a version number of this License which applies to it and "any
|
||||
later version", you have the option of following the terms and conditions
|
||||
either of that version or of any later version published by the Free
|
||||
Software Foundation. If the Program does not specify a version number of
|
||||
this License, you may choose any version ever published by the Free Software
|
||||
Foundation.
|
||||
|
||||
10. If you wish to incorporate parts of the Program into other free
|
||||
programs whose distribution conditions are different, write to the author
|
||||
to ask for permission. For software which is copyrighted by the Free
|
||||
Software Foundation, write to the Free Software Foundation; we sometimes
|
||||
make exceptions for this. Our decision will be guided by the two goals
|
||||
of preserving the free status of all derivatives of our free software and
|
||||
of promoting the sharing and reuse of software generally.
|
||||
|
||||
NO WARRANTY
|
||||
|
||||
11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
|
||||
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
|
||||
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
|
||||
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
|
||||
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||||
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
|
||||
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
|
||||
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
|
||||
REPAIR OR CORRECTION.
|
||||
|
||||
12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
|
||||
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
|
||||
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
|
||||
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
|
||||
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
|
||||
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
|
||||
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
|
||||
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
|
||||
POSSIBILITY OF SUCH DAMAGES.
|
||||
|
||||
END OF TERMS AND CONDITIONS
|
||||
|
||||
How to Apply These Terms to Your New Programs
|
||||
|
||||
If you develop a new program, and you want it to be of the greatest
|
||||
possible use to the public, the best way to achieve this is to make it
|
||||
free software which everyone can redistribute and change under these terms.
|
||||
|
||||
To do so, attach the following notices to the program. It is safest
|
||||
to attach them to the start of each source file to most effectively
|
||||
convey the exclusion of warranty; and each file should have at least
|
||||
the "copyright" line and a pointer to where the full notice is found.
|
||||
|
||||
<one line to give the program's name and a brief idea of what it does.>
|
||||
Copyright (C) <year> <name of author>
|
||||
|
||||
This program is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation; either version 2 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License along
|
||||
with this program; if not, see <https://www.gnu.org/licenses/>.
|
||||
|
||||
Also add information on how to contact you by electronic and paper mail.
|
||||
|
||||
If the program is interactive, make it output a short notice like this
|
||||
when it starts in an interactive mode:
|
||||
|
||||
Gnomovision version 69, Copyright (C) year name of author
|
||||
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
|
||||
This is free software, and you are welcome to redistribute it
|
||||
under certain conditions; type `show c' for details.
|
||||
|
||||
The hypothetical commands `show w' and `show c' should show the appropriate
|
||||
parts of the General Public License. Of course, the commands you use may
|
||||
be called something other than `show w' and `show c'; they could even be
|
||||
mouse-clicks or menu items--whatever suits your program.
|
||||
|
||||
You should also get your employer (if you work as a programmer) or your
|
||||
school, if any, to sign a "copyright disclaimer" for the program, if
|
||||
necessary. Here is a sample; alter the names:
|
||||
|
||||
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
|
||||
`Gnomovision' (which makes passes at compilers) written by James Hacker.
|
||||
|
||||
<signature of Moe Ghoul>, 1 April 1989
|
||||
Moe Ghoul, President of Vice
|
||||
|
||||
This General Public License does not permit incorporating your program into
|
||||
proprietary programs. If your program is a subroutine library, you may
|
||||
consider it more useful to permit linking proprietary applications with the
|
||||
library. If this is what you want to do, use the GNU Lesser General
|
||||
Public License instead of this License.
|
||||
@@ -0,0 +1,18 @@
|
||||
PREFIX ?= $(HOME)
|
||||
BINDIR ?= $(PREFIX)/bin
|
||||
MANDIR ?= $(PREFIX)/share/man/man1
|
||||
CFLAGS ?= -O2
|
||||
CFLAGS += -std=c99 -Wall -Wextra -pedantic
|
||||
|
||||
ansi: ansi.c
|
||||
$(CC) $(CFLAGS) $(LDFLAGS) -o $@ ansi.c
|
||||
|
||||
install: ansi
|
||||
install -d $(DESTDIR)$(BINDIR) $(DESTDIR)$(MANDIR)
|
||||
install -m 755 ansi $(DESTDIR)$(BINDIR)/ansi
|
||||
install -m 644 ansi.1 $(DESTDIR)$(MANDIR)/ansi.1
|
||||
|
||||
clean:
|
||||
rm -f ansi
|
||||
|
||||
.PHONY: install clean
|
||||
@@ -0,0 +1,38 @@
|
||||
# ansi
|
||||
|
||||
Show ANSI art in a modern terminal, or turn it into plain text.
|
||||
|
||||
An `.ans` file is CP437 text with ANSI colour and cursor codes, laid out for an
|
||||
80-column BBS terminal that wraps it. Converting it with `iconv` gets the
|
||||
characters right but not the layout: a lot of art has no line breaks at all, and
|
||||
much of it moves the cursor around. `ansi` draws the file into a grid the way a
|
||||
BBS terminal would, then writes the grid out as UTF-8 lines.
|
||||
|
||||
```console
|
||||
$ ansi piece.ans | less -R # in colour
|
||||
$ ansi --mono piece.ans > piece.txt # no colour, coloured areas as shading
|
||||
$ ansi --plain piece.ans # the characters only
|
||||
$ ansi info piece.ans # title, artist, group, date and size
|
||||
$ curl -s https://16colo.rs/pack/dd26/raw/dd-cola.ans | ansi
|
||||
```
|
||||
|
||||
`--mono` is for places that show no colour, like newsgroups and mail. Each
|
||||
coloured area is redrawn by how bright its colour looks, so art built from
|
||||
coloured spaces keeps its shape instead of going blank.
|
||||
|
||||
It follows the SAUCE record for the width, shows blinking backgrounds bright
|
||||
(iCE colour), and reads standard input when given no file or `-`.
|
||||
|
||||
## Install
|
||||
|
||||
One C99 file, no dependencies.
|
||||
|
||||
```console
|
||||
$ make
|
||||
$ make install # into ~/bin and ~/share/man/man1
|
||||
$ make install PREFIX=/usr/local
|
||||
```
|
||||
|
||||
## Licence
|
||||
|
||||
GPL-2.0. See `LICENSE`.
|
||||
@@ -0,0 +1,69 @@
|
||||
.TH ANSI 1 "October 2026" "ansi 1.0.0" "User Commands"
|
||||
.SH NAME
|
||||
ansi \- show ANSI art in a UTF-8 terminal, or turn it into plain text
|
||||
.SH SYNOPSIS
|
||||
.B ansi
|
||||
[\fB\-p\fR | \fB\-m\fR] [\fB\-w\fR \fIwidth\fR] [\fIfile\fR ...]
|
||||
.br
|
||||
.B ansi info
|
||||
\fIfile\fR ...
|
||||
.SH DESCRIPTION
|
||||
ANSI art, the art of the BBS scene, is CP437 text with ANSI escape codes for
|
||||
colour and cursor movement, laid out for a terminal of a fixed width, usually
|
||||
80 columns, that wraps it.
|
||||
.B ansi
|
||||
draws each
|
||||
.I file
|
||||
into a grid the way an ANSI-BBS terminal would, following the cursor moves and
|
||||
the wrap, and writes the grid out as UTF-8 lines a modern terminal shows as
|
||||
the artist drew them.
|
||||
.PP
|
||||
The SAUCE record at the end of a file, when there is one, gives the width; a
|
||||
background with the blink attribute is shown bright, as iCE colour. With no
|
||||
.IR file ,
|
||||
or when
|
||||
.I file
|
||||
is
|
||||
.BR \- ,
|
||||
.B ansi
|
||||
reads standard input.
|
||||
.SH OPTIONS
|
||||
.TP
|
||||
.BR \-p ", " \-\-plain
|
||||
Write the characters only, without colour.
|
||||
.TP
|
||||
.BR \-m ", " \-\-mono
|
||||
Write without colour, redrawing each coloured area as shading by how bright
|
||||
its colour looks: bright areas as full blocks, dark ones as light shade or
|
||||
space, and half blocks where the top and bottom of a cell differ. Art built
|
||||
from coloured spaces keeps its shape this way, where
|
||||
.B \-\-plain
|
||||
would leave it blank. Useful for newsgroups and mail, which show no colour.
|
||||
.TP
|
||||
.BR \-w ", " \-\-width " " \fIwidth\fR
|
||||
Lay the art out
|
||||
.I width
|
||||
columns wide instead of the SAUCE width (or 80).
|
||||
.TP
|
||||
.B info
|
||||
Print each file's SAUCE record: title, artist, group, date and size.
|
||||
.TP
|
||||
.BR \-h ", " \-\-help
|
||||
Show a summary of usage.
|
||||
.TP
|
||||
.BR \-V ", " \-\-version
|
||||
Show the version.
|
||||
.SH EXAMPLES
|
||||
.nf
|
||||
ansi piece.ans | less \-R
|
||||
ansi \-\-mono piece.ans > piece.txt
|
||||
ansi info *.ans
|
||||
curl \-s https://16colo.rs/pack/<pack>/raw/<piece>.ans | ansi
|
||||
.fi
|
||||
.SH EXIT STATUS
|
||||
0 on success, 1 for a usage error, 2 when a file could not be read.
|
||||
.SH SEE ALSO
|
||||
.BR less (1),
|
||||
.BR iconv (1)
|
||||
.SH AUTHOR
|
||||
funkpower <[email protected]>
|
||||
@@ -0,0 +1,473 @@
|
||||
/*
|
||||
* ansi - show ANSI art in a modern terminal, or turn it into plain text.
|
||||
*
|
||||
* An .ans file is CP437 text with ANSI escape codes, usually laid out for an
|
||||
* 80-column terminal that wraps it. ansi draws it into a grid the way a BBS
|
||||
* terminal would (cursor moves, wrapping, iCE colours, the SAUCE record), then
|
||||
* writes the grid out as UTF-8: in colour, as plain characters, or in
|
||||
* monochrome with coloured areas redrawn as shading.
|
||||
*/
|
||||
#define _POSIX_C_SOURCE 200809L
|
||||
|
||||
#include <errno.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
#define VERSION "1.0.0"
|
||||
#define MAX_WIDTH 1000
|
||||
#define MAX_CELLS (1u << 24) /* about 80 MB of grid; art past it is dropped */
|
||||
|
||||
/* CP437 as UTF-8. 0x01-0x1F are the glyphs art uses them for, not controls. */
|
||||
static const char *const cp437[256] = {
|
||||
" ", "☺", "☻", "♥", "♦", "♣", "♠", "•",
|
||||
"◘", "○", "◙", "♂", "♀", "♪", "♫", "☼",
|
||||
"►", "◄", "↕", "‼", "¶", "§", "▬", "↨",
|
||||
"↑", "↓", "→", "←", "∟", "↔", "▲", "▼",
|
||||
" ", "!", "\"", "#", "$", "%", "&", "'",
|
||||
"(", ")", "*", "+", ",", "-", ".", "/",
|
||||
"0", "1", "2", "3", "4", "5", "6", "7",
|
||||
"8", "9", ":", ";", "<", "=", ">", "\?",
|
||||
"@", "A", "B", "C", "D", "E", "F", "G",
|
||||
"H", "I", "J", "K", "L", "M", "N", "O",
|
||||
"P", "Q", "R", "S", "T", "U", "V", "W",
|
||||
"X", "Y", "Z", "[", "\\", "]", "^", "_",
|
||||
"`", "a", "b", "c", "d", "e", "f", "g",
|
||||
"h", "i", "j", "k", "l", "m", "n", "o",
|
||||
"p", "q", "r", "s", "t", "u", "v", "w",
|
||||
"x", "y", "z", "{", "|", "}", "~", "⌂",
|
||||
"Ç", "ü", "é", "â", "ä", "à", "å", "ç",
|
||||
"ê", "ë", "è", "ï", "î", "ì", "Ä", "Å",
|
||||
"É", "æ", "Æ", "ô", "ö", "ò", "û", "ù",
|
||||
"ÿ", "Ö", "Ü", "¢", "£", "¥", "₧", "ƒ",
|
||||
"á", "í", "ó", "ú", "ñ", "Ñ", "ª", "º",
|
||||
"¿", "⌐", "¬", "½", "¼", "¡", "«", "»",
|
||||
"░", "▒", "▓", "│", "┤", "╡", "╢", "╖",
|
||||
"╕", "╣", "║", "╗", "╝", "╜", "╛", "┐",
|
||||
"└", "┴", "┬", "├", "─", "┼", "╞", "╟",
|
||||
"╚", "╔", "╩", "╦", "╠", "═", "╬", "╧",
|
||||
"╨", "╤", "╥", "╙", "╘", "╒", "╓", "╫",
|
||||
"╪", "┘", "┌", "█", "▄", "▌", "▐", "▀",
|
||||
"α", "ß", "Γ", "π", "Σ", "σ", "µ", "τ",
|
||||
"Φ", "Θ", "Ω", "δ", "∞", "φ", "ε", "∩",
|
||||
"≡", "±", "≥", "≤", "⌠", "⌡", "÷", "≈",
|
||||
"°", "∙", "·", "√", "ⁿ", "²", "■", " ",
|
||||
};
|
||||
|
||||
/* How bright each of the 16 CGA colours looks (CIE L*, 0-100). */
|
||||
static const double lightness[16] = {
|
||||
0.0000, 35.0952, 60.5599, 45.6931, 19.6482, 40.3255, 63.0540, 69.6102,
|
||||
36.1459, 60.2599, 88.9731, 97.4042, 46.5096, 65.7308, 91.9852, 100.0000
|
||||
};
|
||||
|
||||
enum mode { COLOUR, PLAIN, MONO };
|
||||
|
||||
typedef struct {
|
||||
unsigned char ch; /* CP437 byte; 0 is stored as a space */
|
||||
unsigned char fg, bg; /* 0-7 */
|
||||
unsigned char bold, blink; /* blink is iCE: the bright background */
|
||||
} cell;
|
||||
|
||||
typedef struct {
|
||||
char title[36], author[21], group[21], date[9];
|
||||
unsigned width, height, comments, flags;
|
||||
unsigned char datatype, filetype;
|
||||
int present;
|
||||
} sauce;
|
||||
|
||||
typedef struct {
|
||||
cell *cells;
|
||||
size_t rows, cap;
|
||||
unsigned width;
|
||||
} grid;
|
||||
|
||||
static const char *progname = "ansi";
|
||||
|
||||
static void *xrealloc(void *p, size_t n)
|
||||
{
|
||||
p = realloc(p, n);
|
||||
if (!p) {
|
||||
fprintf(stderr, "%s: out of memory\n", progname);
|
||||
exit(2);
|
||||
}
|
||||
return p;
|
||||
}
|
||||
|
||||
static unsigned char *slurp(const char *path, size_t *len)
|
||||
{
|
||||
FILE *f = strcmp(path, "-") ? fopen(path, "rb") : stdin;
|
||||
if (!f) {
|
||||
fprintf(stderr, "%s: %s: %s\n", progname, path, strerror(errno));
|
||||
return NULL;
|
||||
}
|
||||
size_t cap = 65536, n = 0;
|
||||
unsigned char *buf = xrealloc(NULL, cap);
|
||||
for (;;) {
|
||||
size_t got = fread(buf + n, 1, cap - n, f);
|
||||
n += got;
|
||||
if (n < cap)
|
||||
break;
|
||||
buf = xrealloc(buf, cap *= 2);
|
||||
}
|
||||
if (ferror(f)) {
|
||||
fprintf(stderr, "%s: %s: read error\n", progname, path);
|
||||
free(buf);
|
||||
buf = NULL;
|
||||
}
|
||||
if (f != stdin)
|
||||
fclose(f);
|
||||
*len = n;
|
||||
return buf;
|
||||
}
|
||||
|
||||
static void field(char *dst, const unsigned char *src, size_t n)
|
||||
{
|
||||
memcpy(dst, src, n);
|
||||
dst[n] = '\0';
|
||||
for (size_t i = n; i > 0 && (dst[i - 1] == ' ' || dst[i - 1] == '\0'); i--)
|
||||
dst[i - 1] = '\0';
|
||||
}
|
||||
|
||||
static unsigned u16(const unsigned char *p) { return p[0] | p[1] << 8; }
|
||||
|
||||
/* Read the SAUCE record and shorten len to the art itself. */
|
||||
static void read_sauce(const unsigned char *data, size_t *len, sauce *s)
|
||||
{
|
||||
memset(s, 0, sizeof *s);
|
||||
s->width = 80;
|
||||
if (*len >= 128 && !memcmp(data + *len - 128, "SAUCE00", 7)) {
|
||||
const unsigned char *r = data + *len - 128;
|
||||
s->present = 1;
|
||||
field(s->title, r + 7, 35);
|
||||
field(s->author, r + 42, 20);
|
||||
field(s->group, r + 62, 20);
|
||||
field(s->date, r + 82, 8);
|
||||
s->datatype = r[94];
|
||||
s->filetype = r[95];
|
||||
s->comments = r[104];
|
||||
s->flags = r[105];
|
||||
s->height = u16(r + 98);
|
||||
if (s->datatype == 1 && s->filetype <= 1 && u16(r + 96) && u16(r + 96) <= MAX_WIDTH)
|
||||
s->width = u16(r + 96);
|
||||
size_t trailer = 128 + (s->comments ? 5 + 64 * s->comments : 0);
|
||||
*len = *len > trailer ? *len - trailer : 0;
|
||||
}
|
||||
const unsigned char *eof = memchr(data, 0x1A, *len);
|
||||
if (eof)
|
||||
*len = eof - data;
|
||||
}
|
||||
|
||||
/* The cell at x, y, growing the grid to reach it; NULL past MAX_CELLS. */
|
||||
static cell *at(grid *g, unsigned x, size_t y)
|
||||
{
|
||||
if (y >= MAX_CELLS / g->width)
|
||||
return NULL;
|
||||
if (y >= g->rows) {
|
||||
size_t want = y + 1;
|
||||
if (want > g->cap) {
|
||||
g->cap = want * 2;
|
||||
g->cells = xrealloc(g->cells, g->cap * g->width * sizeof(cell));
|
||||
}
|
||||
for (size_t r = g->rows; r < want; r++)
|
||||
for (unsigned c = 0; c < g->width; c++)
|
||||
g->cells[r * g->width + c] = (cell){' ', 7, 0, 0, 0};
|
||||
g->rows = want;
|
||||
}
|
||||
return &g->cells[y * g->width + x];
|
||||
}
|
||||
|
||||
/* Lay the art out in a grid, the way an ANSI-BBS terminal of the given width would. */
|
||||
static void render(grid *g, const unsigned char *d, size_t n)
|
||||
{
|
||||
unsigned x = 0, sx = 0, w = g->width;
|
||||
size_t y = 0, sy = 0;
|
||||
unsigned char fg = 7, bg = 0, bold = 0, blink = 0;
|
||||
|
||||
for (size_t i = 0; i < n;) {
|
||||
unsigned char b = d[i];
|
||||
if (b == 0x1B && i + 1 < n && d[i + 1] == '[') {
|
||||
size_t j = i + 2, ps = j;
|
||||
while (j < n && d[j] >= 0x30 && d[j] <= 0x3F)
|
||||
j++;
|
||||
size_t pe = j;
|
||||
while (j < n && d[j] >= 0x20 && d[j] <= 0x2F)
|
||||
j++;
|
||||
if (j >= n || d[j] < 0x40 || d[j] > 0x7E)
|
||||
break; /* a broken sequence ends the art */
|
||||
unsigned char cmd = d[j];
|
||||
i = j + 1;
|
||||
if (pe > ps && d[ps] == '?')
|
||||
continue; /* private modes, such as line wrap */
|
||||
unsigned p[16], np = 0;
|
||||
if (pe > ps) {
|
||||
p[0] = 0;
|
||||
np = 1;
|
||||
for (size_t k = ps; k < pe; k++) {
|
||||
if (d[k] == ';') {
|
||||
if (np < 16)
|
||||
p[np++] = 0;
|
||||
} else if (d[k] >= '0' && d[k] <= '9' && np <= 16) {
|
||||
p[np - 1] = p[np - 1] * 10 + (d[k] - '0');
|
||||
}
|
||||
}
|
||||
}
|
||||
unsigned arg = np && p[0] ? p[0] : 1;
|
||||
switch (cmd) {
|
||||
case 'm':
|
||||
if (!np)
|
||||
p[np++] = 0;
|
||||
for (unsigned k = 0; k < np; k++) {
|
||||
unsigned v = p[k];
|
||||
if (v == 0)
|
||||
fg = 7, bg = 0, bold = 0, blink = 0;
|
||||
else if (v == 1)
|
||||
bold = 1;
|
||||
else if (v == 5)
|
||||
blink = 1;
|
||||
else if (v == 22)
|
||||
bold = 0;
|
||||
else if (v == 25)
|
||||
blink = 0;
|
||||
else if (v >= 30 && v <= 37)
|
||||
fg = v - 30;
|
||||
else if (v == 39)
|
||||
fg = 7;
|
||||
else if (v >= 40 && v <= 47)
|
||||
bg = v - 40;
|
||||
else if (v == 49)
|
||||
bg = 0;
|
||||
}
|
||||
break;
|
||||
case 'C': x = x + arg < w ? x + arg : w; break;
|
||||
case 'D': x = x > arg ? x - arg : 0; break;
|
||||
case 'A': y = y > arg ? y - arg : 0; break;
|
||||
case 'B': y += arg; break;
|
||||
case 'H':
|
||||
case 'f':
|
||||
y = (np && p[0] ? p[0] : 1) - 1;
|
||||
x = (np > 1 && p[1] ? p[1] : 1) - 1;
|
||||
if (x > w - 1)
|
||||
x = w - 1;
|
||||
break;
|
||||
case 's': sx = x, sy = y; break;
|
||||
case 'u': x = sx, y = sy; break;
|
||||
case 'J':
|
||||
if (arg == 2)
|
||||
g->rows = 0, x = 0, y = 0;
|
||||
break;
|
||||
}
|
||||
continue;
|
||||
}
|
||||
i++;
|
||||
if (b == '\r') {
|
||||
x = 0;
|
||||
} else if (b == '\n') {
|
||||
x = 0, y++;
|
||||
} else if (b == 0x1B) {
|
||||
/* a lone escape */
|
||||
} else {
|
||||
unsigned count = b == '\t' ? 8 - x % 8 : 1;
|
||||
unsigned char ch = b == '\t' || b == 0 ? ' ' : b;
|
||||
while (count--) {
|
||||
if (x >= w)
|
||||
x = 0, y++; /* wrap only when the next character arrives */
|
||||
cell *c = at(g, x, y);
|
||||
if (c)
|
||||
*c = (cell){ch, fg, bg, bold, blink};
|
||||
x++;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static int same(const cell *a, const cell *b)
|
||||
{
|
||||
return a->fg == b->fg && a->bg == b->bg && a->bold == b->bold && a->blink == b->blink;
|
||||
}
|
||||
|
||||
static int level(double l)
|
||||
{
|
||||
return l < 15 ? 0 : l < 40 ? 1 : l < 60 ? 2 : l < 85 ? 3 : 4;
|
||||
}
|
||||
|
||||
/* How much of a cell the foreground covers, top half and bottom half; -1 if not a block. */
|
||||
static double cover(unsigned char ch, int half)
|
||||
{
|
||||
switch (ch) {
|
||||
case ' ': return 0;
|
||||
case 0xDB: return 1; /* full block */
|
||||
case 0xDF: return half ? 0 : 1; /* upper half */
|
||||
case 0xDC: return half ? 1 : 0; /* lower half */
|
||||
case 0xDD: case 0xDE: return .5; /* left and right halves */
|
||||
case 0xB0: return .25;
|
||||
case 0xB1: return .5;
|
||||
case 0xB2: return .75;
|
||||
default: return -1;
|
||||
}
|
||||
}
|
||||
|
||||
/* One character standing in for a coloured cell: shading by brightness, half blocks for halves. */
|
||||
static const char *mono(const cell *c)
|
||||
{
|
||||
static const char *const shade[5] = {" ", "░", "▒", "▓", "█"};
|
||||
if (cover(c->ch, 0) < 0)
|
||||
return cp437[c->ch];
|
||||
double f = lightness[c->fg + 8 * c->bold], b = lightness[c->bg + 8 * c->blink];
|
||||
int top = level(cover(c->ch, 0) * f + (1 - cover(c->ch, 0)) * b);
|
||||
int bot = level(cover(c->ch, 1) * f + (1 - cover(c->ch, 1)) * b);
|
||||
if (top - bot >= 2)
|
||||
return "▀";
|
||||
if (bot - top >= 2)
|
||||
return "▄";
|
||||
return shade[top > bot ? top : bot];
|
||||
}
|
||||
|
||||
static void emit(const grid *g, enum mode m, FILE *out)
|
||||
{
|
||||
/* Lines are built first so that trailing blank ones can be dropped. */
|
||||
char **lines = xrealloc(NULL, (g->rows + 1) * sizeof *lines);
|
||||
size_t nlines = 0;
|
||||
for (size_t y = 0; y < g->rows; y++) {
|
||||
const cell *row = &g->cells[y * g->width];
|
||||
unsigned len = g->width;
|
||||
while (len && row[len - 1].ch == ' ' && !row[len - 1].bg && !row[len - 1].blink)
|
||||
len--;
|
||||
size_t cap = 64 + len * 24, n = 0;
|
||||
char *s = xrealloc(NULL, cap);
|
||||
const cell *last = NULL;
|
||||
for (unsigned x = 0; x < len; x++) {
|
||||
const cell *c = &row[x];
|
||||
const char *glyph = m == MONO ? mono(c) : cp437[c->ch];
|
||||
if (m == COLOUR) {
|
||||
int keep = last && (same(c, last) ||
|
||||
(c->ch == ' ' && c->bg == last->bg && c->blink == last->blink));
|
||||
if (!keep) {
|
||||
n += sprintf(s + n, "\033[0;%s%d;%dm", c->bold ? "1;" : "",
|
||||
30 + c->fg, (c->blink ? 100 : 40) + c->bg);
|
||||
last = c;
|
||||
}
|
||||
}
|
||||
size_t gl = strlen(glyph);
|
||||
memcpy(s + n, glyph, gl);
|
||||
n += gl;
|
||||
}
|
||||
if (m == COLOUR && len)
|
||||
n += sprintf(s + n, "\033[0m");
|
||||
else
|
||||
while (n && s[n - 1] == ' ')
|
||||
n--;
|
||||
s[n] = '\0';
|
||||
lines[nlines++] = s;
|
||||
}
|
||||
while (nlines && !*lines[nlines - 1])
|
||||
free(lines[--nlines]);
|
||||
for (size_t i = 0; i < nlines; i++) {
|
||||
fputs(lines[i], out);
|
||||
fputc('\n', out);
|
||||
free(lines[i]);
|
||||
}
|
||||
free(lines);
|
||||
}
|
||||
|
||||
static void info(const char *path, const sauce *s, const grid *g, FILE *out)
|
||||
{
|
||||
static const char *const types[] = {"ASCII", "ANSi", "ANSiMation"};
|
||||
fprintf(out, "%s\n", path);
|
||||
if (!s->present) {
|
||||
fprintf(out, " no SAUCE record; laid out at %u columns, %zu row%s\n", g->width, g->rows,
|
||||
g->rows == 1 ? "" : "s");
|
||||
return;
|
||||
}
|
||||
if (*s->title) fprintf(out, " title %s\n", s->title);
|
||||
if (*s->author) fprintf(out, " author %s\n", s->author);
|
||||
if (*s->group) fprintf(out, " group %s\n", s->group);
|
||||
if (strlen(s->date) == 8)
|
||||
fprintf(out, " date %.4s-%.2s-%.2s\n", s->date, s->date + 4, s->date + 6);
|
||||
fprintf(out, " size %ux%u", s->width, s->height ? s->height : (unsigned)g->rows);
|
||||
if (s->datatype == 1 && s->filetype <= 2)
|
||||
fprintf(out, ", %s", types[s->filetype]);
|
||||
if (s->flags & 1)
|
||||
fprintf(out, ", iCE colours");
|
||||
fputc('\n', out);
|
||||
}
|
||||
|
||||
static void usage(FILE *out)
|
||||
{
|
||||
fprintf(out,
|
||||
"usage: %s [-p | -m] [-w WIDTH] [FILE...]\n"
|
||||
" %s info FILE...\n"
|
||||
"\n"
|
||||
"Show ANSI art (CP437 with ANSI colour codes, as .ans files are) in a UTF-8\n"
|
||||
"terminal, laid out the way a BBS terminal would draw it. With no FILE, or\n"
|
||||
"when FILE is -, it reads standard input.\n"
|
||||
"\n"
|
||||
" -p, --plain the characters only, no colour\n"
|
||||
" -m, --mono no colour, with coloured areas redrawn as shading by\n"
|
||||
" brightness (for newsgroups and mail that show no colour)\n"
|
||||
" -w, --width N lay the art out N columns wide (default: SAUCE, else 80)\n"
|
||||
" info print each file's SAUCE record: title, artist, size\n"
|
||||
" -h, --help show this help\n"
|
||||
" -V, --version show the version\n"
|
||||
"\n"
|
||||
"Examples:\n"
|
||||
" %s piece.ans | less -R\n"
|
||||
" %s --mono piece.ans > piece.txt\n",
|
||||
progname, progname, progname, progname);
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
enum mode m = COLOUR;
|
||||
unsigned width = 0;
|
||||
int show_info = 0, status = 0, files = 0;
|
||||
|
||||
for (int i = 1; i < argc; i++) {
|
||||
const char *a = argv[i];
|
||||
if (!strcmp(a, "-h") || !strcmp(a, "--help") || !strcmp(a, "help")) {
|
||||
usage(stdout);
|
||||
return 0;
|
||||
} else if (!strcmp(a, "-V") || !strcmp(a, "--version")) {
|
||||
printf("%s %s\n", progname, VERSION);
|
||||
return 0;
|
||||
} else if (!strcmp(a, "-p") || !strcmp(a, "--plain")) {
|
||||
m = PLAIN;
|
||||
} else if (!strcmp(a, "-m") || !strcmp(a, "--mono")) {
|
||||
m = MONO;
|
||||
} else if (!strcmp(a, "-w") || !strcmp(a, "--width")) {
|
||||
if (++i >= argc || (width = (unsigned)strtoul(argv[i], NULL, 10)) < 1 || width > 1000) {
|
||||
fprintf(stderr, "%s: --width needs a number from 1 to 1000\n", progname);
|
||||
return 1;
|
||||
}
|
||||
} else if (!strcmp(a, "info") && files == 0 && !show_info) {
|
||||
show_info = 1;
|
||||
} else if (a[0] == '-' && a[1]) {
|
||||
fprintf(stderr, "%s: unknown option %s\n", progname, a);
|
||||
usage(stderr);
|
||||
return 1;
|
||||
} else {
|
||||
argv[++files] = argv[i]; /* keep the file names at the front */
|
||||
}
|
||||
}
|
||||
if (!files)
|
||||
argv[++files] = "-";
|
||||
|
||||
for (int f = 1; f <= files; f++) {
|
||||
size_t len;
|
||||
unsigned char *data = slurp(argv[f], &len);
|
||||
if (!data) {
|
||||
status = 2;
|
||||
continue;
|
||||
}
|
||||
sauce s;
|
||||
read_sauce(data, &len, &s);
|
||||
grid g = {NULL, 0, 0, width ? width : s.width};
|
||||
render(&g, data, len);
|
||||
if (show_info)
|
||||
info(argv[f], &s, &g, stdout);
|
||||
else
|
||||
emit(&g, m, stdout);
|
||||
free(g.cells);
|
||||
free(data);
|
||||
}
|
||||
return status;
|
||||
}
|
||||
Reference in new issue
Block a user