Initial commit.

8 files changed, 835 insertions, 0 deletions

diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..cb2c02a
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,178 @@
+---
+Language:        Cpp
+# BasedOnStyle:  LLVM
+AccessModifierOffset: -2
+AlignAfterOpenBracket: Align
+AlignArrayOfStructures: None
+AlignConsecutiveMacros: None
+AlignConsecutiveAssignments: None
+AlignConsecutiveBitFields: None
+AlignConsecutiveDeclarations: None
+AlignEscapedNewlines: Right
+AlignOperands:   Align
+AlignTrailingComments: true
+AllowAllArgumentsOnNextLine: true
+AllowAllConstructorInitializersOnNextLine: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortEnumsOnASingleLine: true
+AllowShortBlocksOnASingleLine: Never
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: All
+AllowShortLambdasOnASingleLine: All
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: MultiLine
+AttributeMacros:
+  - __capability
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterCaseLabel:  false
+  AfterClass:      false
+  AfterControlStatement: Never
+  AfterEnum:       false
+  AfterFunction:   false
+  AfterNamespace:  false
+  AfterObjCDeclaration: false
+  AfterStruct:     false
+  AfterUnion:      false
+  AfterExternBlock: false
+  BeforeCatch:     false
+  BeforeElse:      false
+  BeforeLambdaBody: false
+  BeforeWhile:     false
+  IndentBraces:    false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: true
+  SplitEmptyNamespace: true
+BreakBeforeBinaryOperators: None
+BreakBeforeConceptDeclarations: true
+BreakBeforeBraces: Attach
+BreakBeforeInheritanceComma: false
+BreakInheritanceList: BeforeColon
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializersBeforeComma: false
+BreakConstructorInitializers: BeforeColon
+BreakAfterJavaFieldAnnotations: false
+BreakStringLiterals: true
+ColumnLimit:     80
+CommentPragmas:  '^ IWYU pragma:'
+CompactNamespaces: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 2
+Cpp11BracedListStyle: true
+DeriveLineEnding: true
+DerivePointerAlignment: false
+DisableFormat:   false
+EmptyLineAfterAccessModifier: Never
+EmptyLineBeforeAccessModifier: LogicalBlock
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: true
+ForEachMacros:
+  - foreach
+  - Q_FOREACH
+  - BOOST_FOREACH
+IfMacros:
+  - KJ_IF_MAYBE
+IncludeBlocks:   Preserve
+IncludeCategories:
+  - Regex:           '^"(llvm|llvm-c|clang|clang-c)/'
+    Priority:        2
+    SortPriority:    0
+    CaseSensitive:   false
+  - Regex:           '^(<|"(gtest|gmock|isl|json)/)'
+    Priority:        3
+    SortPriority:    0
+    CaseSensitive:   false
+  - Regex:           '.*'
+    Priority:        1
+    SortPriority:    0
+    CaseSensitive:   false
+IncludeIsMainRegex: '(Test)?$'
+IncludeIsMainSourceRegex: ''
+IndentAccessModifiers: false
+IndentCaseLabels: false
+IndentCaseBlocks: false
+IndentGotoLabels: true
+IndentPPDirectives: None
+IndentExternBlock: AfterExternBlock
+IndentRequires:  false
+IndentWidth:     2
+IndentWrappedFunctionNames: false
+InsertTrailingCommas: None
+JavaScriptQuotes: Leave
+JavaScriptWrapImports: true
+KeepEmptyLinesAtTheStartOfBlocks: true
+LambdaBodyIndentation: Signature
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBinPackProtocolList: Auto
+ObjCBlockIndentWidth: 2
+ObjCBreakBeforeNestedBlockParam: true
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
+PenaltyBreakAssignment: 2
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyBreakTemplateDeclaration: 10
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 60
+PenaltyIndentedWhitespace: 0
+PointerAlignment: Right
+PPIndentWidth:   -1
+ReferenceAlignment: Pointer
+ReflowComments:  true
+ShortNamespaceLines: 1
+SortIncludes:    CaseSensitive
+SortJavaStaticImport: Before
+SortUsingDeclarations: true
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCaseColon: false
+SpaceBeforeCpp11BracedList: false
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: ControlStatements
+SpaceAroundPointerQualifiers: Default
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceInEmptyBlock: false
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles:  Never
+SpacesInConditionalStatement: false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInLineCommentPrefix:
+  Minimum:         1
+  Maximum:         -1
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+SpaceBeforeSquareBrackets: false
+BitFieldColonSpacing: Both
+Standard:        Latest
+StatementAttributeLikeMacros:
+  - Q_EMIT
+StatementMacros:
+  - Q_UNUSED
+  - QT_REQUIRE_VERSION
+TabWidth:        2
+UseCRLF:         false
+UseTab:          ForIndentation
+WhitespaceSensitiveMacros:
+  - STRINGIZE
+  - PP_STRINGIZE
+  - BOOST_PP_STRINGIZE
+  - NS_SWIFT_NAME
+  - CF_SWIFT_NAME
+...
+
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..498c6c2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,11 @@
+# automake
+config.h.in*
+aclocal.m4
+Makefile.in
+configure
+configure~
+m4/*
+build/*
+autom4te.cache/*
+
+**/*a.out
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..d159169
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ 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
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+have the freedom to distribute copies of free software (and charge for
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+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
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+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
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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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+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
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+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+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
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+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,
+
+    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
+    cost of physically performing source distribution, a complete
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+    customarily used for software interchange; or,
+
+    c) Accompany it with the information you received as to the offer
+    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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+
+The source code for a work means the preferred form of the work for
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+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
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+these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+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),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+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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+
+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
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
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+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+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, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+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 Ty Coon>, 1 April 1989
+  Ty Coon, 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.
diff --git a/Makefile.am b/Makefile.am
new file mode 100644
index 0000000..6e4c431
--- /dev/null
+++ b/Makefile.am
@@ -0,0 +1,5 @@
+ACLOCAL_AMFLAGS = -I m4
+
+bin_PROGRAMS = matrix
+
+matrix_SOURCES = src/main.c  
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..994cc08
--- /dev/null
+++ b/README.md
@@ -0,0 +1,26 @@
+# Matrix Digital Rain
+
+![example](example.png)
+
+> All I see now is blonde, brunette, redhead.
+
+ -- _Cypher_
+
+# Overview
+
+Pure C implementation of the famous [digital rain](https://en.wikipedia.org/wiki/Matrix_digital_rain) effect from _The Matrix_ series. While the implementation was inspired by [fakesteak](https://github.com/domsson/fakesteak), this implementation uses the default colours of the terminal to match the overall theme of the setup. Colour of the first drop can be changed by changing `ANSI_COL_DROP` which is set to white by default.
+
+Glitching effect is implemented using unicode characters, hence the terminal needs to support them or else change the glitch code characters to ascii before compiling.
+
+# Building
+
+All the code is in a single file (src/main.c) and has no dependencies. So, you can compile it any way you like. If you have autotools installed you can build the project with:
+```
+autoreconf -i
+cd build/
+../configure
+make
+```
+# Contributing
+
+Code is hosted on [sourcehut](https://git.sr.ht/~sadeep/matrix-digital-rain). Please submit your patches there or via email to sadeep@asciimx.com ([PGP key](http://www.asciimx.com/sadeep.asc)).
diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..e86bb66
--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,15 @@
+AC_PREREQ([2.71])
+AC_INIT([matrix],[0.0.1],[sadeep@asciimx.com])
+AC_CONFIG_AUX_DIR([build])
+AC_CONFIG_MACRO_DIRS([m4])
+AC_CONFIG_SRCDIR([src/main.c])
+AC_CONFIG_HEADERS([config.h])
+AM_INIT_AUTOMAKE([-Wall -Werror foreign subdir-objects])
+AM_PROG_AR
+
+LT_INIT
+
+AC_PROG_CC
+
+AC_CONFIG_FILES([Makefile])
+AC_OUTPUT
diff --git a/example.png b/example.png
new file mode 100644
index 0000000..fbe8b0c
--- /dev/null
+++ b/example.png
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..338cc3a
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,261 @@
+#define _XOPEN_SOURCE 700
+
+#include <locale.h>
+#include <signal.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <termios.h>
+#include <time.h>
+#include <unistd.h>
+#include <wchar.h>
+
+#define ANSI_COL_DROP "\x1b[97m"
+#define ANSI_CUR_HIDE "\e[?25l"
+#define ANSI_CUR_SHOW "\e[?25h"
+#define ANSI_CUR_RESET "\x1b[H"
+#define ANSI_SCRN_CLEAR "\x1b[2J"
+#define ANSI_FONT_RESET "\x1b[0m"
+
+typedef struct matrix_tag {
+	int rows;
+	int cols;
+	wchar_t *code;
+} matrix;
+
+static int mat_index(const matrix *mat, int row, int col) {
+	return mat->cols * row + col;
+}
+
+static int mat_init(matrix *mat, struct winsize *ws) {
+	int i, j;
+
+	static wchar_t code[] = {
+	  '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', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
+	  'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
+
+	static int codelen = sizeof(code) / sizeof(code[0]);
+
+	mat->rows = ws->ws_row + 1;
+	mat->cols = ws->ws_col;
+	mat->code = realloc(mat->code, sizeof mat->code[0] * mat->rows * mat->cols);
+	if (mat->code) {
+		for (i = 0; i < mat->rows; i++) {
+			for (j = 0; j < mat->cols; j++)
+				mat->code[mat_index(mat, i, j)] = code[rand() % codelen];
+		}
+		return 1;
+	}
+	return 0;
+}
+
+typedef struct table_tag {
+	int len;   // number of columns
+	int *cols; // column indices
+	int *rows; // row indices ((rows[i], cols[i]) points to a cell in the matrix)
+	int *attr; // cell attributes
+} table;
+
+static void shuffle(int *a, int n) {
+	int i, j, tmp;
+
+	for (i = n - 1; i > 0; i--) {
+		j = rand() % (i + 1);
+		tmp = a[j];
+		a[j] = a[i];
+		a[i] = tmp;
+	}
+}
+
+static int tab_init(table *tab, const matrix *mat) {
+	size_t i;
+
+	tab->len = mat->cols;
+	tab->cols = realloc(tab->cols, sizeof tab->cols[0] * tab->len);
+	tab->rows = realloc(tab->rows, sizeof tab->rows[0] * tab->len);
+	tab->attr = realloc(tab->attr, sizeof tab->attr[0] * tab->len);
+
+	if (tab->cols && tab->rows && tab->attr) {
+		for (i = 0; i < mat->cols; i++) {
+			tab->rows[i] = 0;
+			tab->cols[i] = i;
+			tab->attr[i] = 0;
+		}
+		shuffle(tab->cols, tab->len);
+		return 1;
+	}
+	return 0;
+}
+
+static void tab_free(table *tab) {
+	free(tab->cols);
+	free(tab->rows);
+	free(tab->attr);
+}
+
+static int term_init() {
+	struct termios ta;
+
+	if (tcgetattr(STDIN_FILENO, &ta) == 0) {
+		ta.c_lflag &= ~ECHO;
+		if (tcsetattr(STDIN_FILENO, TCSANOW, &ta) == 0) {
+			wprintf(L"%s", ANSI_CUR_HIDE);
+			wprintf(L"%s", ANSI_CUR_RESET);
+			wprintf(L"%s", ANSI_SCRN_CLEAR);
+			setvbuf(stdout, 0, _IOFBF, 0);
+			return 1;
+		}
+	}
+	return 0;
+}
+
+static void term_reset() {
+	struct termios ta;
+
+	wprintf(L"%s", ANSI_FONT_RESET);
+	wprintf(L"%s", ANSI_CUR_SHOW);
+	wprintf(L"%s", ANSI_SCRN_CLEAR);
+	wprintf(L"%s", ANSI_CUR_RESET);
+
+	if (tcgetattr(STDIN_FILENO, &ta) == 0) {
+		ta.c_lflag |= ECHO;
+		if (tcsetattr(STDIN_FILENO, TCSANOW, &ta) != 0)
+			perror("term_reset()");
+	}
+	setvbuf(stdout, 0, _IOLBF, 0);
+}
+
+static void term_size(struct winsize *ws) {
+	ioctl(STDOUT_FILENO, TIOCGWINSZ, ws);
+}
+
+static void term_clear_cell(int row, int col) {
+	wprintf(L"\x1b[%d;%dH ", row, col);
+}
+
+static void term_reset_cell(const matrix *mat, int row, int col) {
+	wprintf(L"\x1b[%d;%dH\x1b[39m%lc", row, col,
+	        mat->code[mat_index(mat, row, col)]);
+}
+
+static void term_print(const matrix *mat, int row, int col) {
+	wprintf(L"\x1b[%d;%dH%s%lc", row, col, ANSI_COL_DROP,
+	        mat->code[mat_index(mat, row, col)]);
+}
+
+static void term_glitch(int row, int col) {
+	static wchar_t code[] = {
+	  0x0413, // Г
+	  0x0418, // И
+	  0x042F, // Я
+	  0x2200, // ∀
+	  0x04D9, // ә
+	  0x0500, // Ԁ
+	  0x2203, // ∃
+	  0x2132, // Ⅎ
+	  0x0245, // Ʌ
+	  0x037B, // ͻ
+	  0x03FD, // Ͻ
+	  0x041F, // П
+	  0x04D4, // Ӕ
+	  0x0424, // Ф
+	};
+
+	static int codelen = sizeof(code) / sizeof(code[0]);
+
+	wprintf(L"\x1b[%d;%dH\x1b[39m%lc", row, col, code[rand() % codelen]);
+}
+
+static volatile int run;
+
+static void handle_signal(int sa) {
+	switch (sa) {
+	case SIGINT:
+	case SIGQUIT:
+	case SIGTERM:
+		run = 0;
+		break;
+	}
+}
+
+int main(int argc, char *argv[]) {
+	matrix mat;
+	table tab;
+	struct winsize ws;
+	struct timespec ts;
+	struct sigaction sa;
+	int i, cols, blank, delay, tmp;
+
+	setlocale(LC_CTYPE, "");
+
+	sa.sa_handler = handle_signal;
+	sigaction(SIGINT, &sa, 0);
+	sigaction(SIGQUIT, &sa, 0);
+	sigaction(SIGTERM, &sa, 0);
+
+	srand(time(0));
+
+	if (!term_init())
+		return 1;
+
+	term_size(&ws);
+	mat = (matrix){0};
+	if (!mat_init(&mat, &ws)) {
+		term_reset();
+		return 1;
+	}
+
+	tab = (table){0};
+	if (!tab_init(&tab, &mat)) {
+		term_reset();
+		return 1;
+	}
+
+	delay = 75;
+	ts.tv_sec = delay / 1000;
+	ts.tv_nsec = (delay % 1000) * 1000000;
+
+	run = cols = 1;
+	blank = tab.cols[tab.len - 1];
+	while (run) {
+		for (i = 0; run && i < cols; i++) {
+			if (tab.rows[i] == mat.rows) {
+				tab.rows[i] = 0;
+				term_reset_cell(&mat, mat.rows - 1, tab.cols[i]);
+			}
+			if (tab.attr[i] == 0) {
+				// hard-coding to 5 (row[i] - rand() % rows[i] glitches on empty rows)
+				if (tab.rows[i] > 5 && rand() % 6 == 0)
+					term_glitch(tab.rows[i] - 5, tab.cols[i]);
+				if (tab.rows[i] > 0)
+					term_reset_cell(&mat, tab.rows[i] - 1, tab.cols[i]);
+				term_print(&mat, tab.rows[i], tab.cols[i]);
+				if (tab.rows[i] == mat.rows - 1)
+					tab.attr[i] = 1;
+				tab.rows[i]++;
+			} else {
+				term_clear_cell(tab.rows[i], tab.cols[i]);
+				if (tab.rows[i] == mat.rows - 1) {
+					tab.rows[i] = 0;
+					tab.attr[i] = 0;
+					tmp = blank;
+					blank = tab.cols[i];
+					tab.cols[i] = tmp;
+				} else
+					tab.rows[i]++;
+			}
+		}
+		if (cols < tab.len * 0.6)
+			tab.rows[cols++] = 0;
+		fflush(stdout);
+		nanosleep(&ts, &ts);
+	}
+
+	term_reset();
+	tab_free(&tab);
+	free(mat.code);
+	return 0;
+}