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  1. 12
      .gitattributes
  2. 47
      .gitignore
  3. 44
      .travis.yml
  4. 674
      COPYING
  5. 59
      INSTALL.org
  6. 9
      Makefile.am
  7. 35
      README.org
  8. 50
      configure.ac
  9. 12
      examples/Makefile.am
  10. 283
      examples/sixdraw.c
  11. 12
      man/Makefile.am
  12. 66
      man/ctlseqs.7
  13. 34
      man/ctlseqs_matcher_free.3
  14. 35
      man/ctlseqs_matcher_init.3
  15. 63
      man/ctlseqs_matcher_setopt.3
  16. 99
      man/ctlseqs_read.3
  17. 34
      man/ctlseqs_reader_free.3
  18. 35
      man/ctlseqs_reader_init.3
  19. 154
      man/ctlseqs_reader_setopt.3
  20. 21
      src/Makefile.am
  21. 502
      src/ctlseqs.c
  22. 419
      src/ctlseqs.h
  23. 172
      src/ctlseqs.hh
  24. 12
      tests/Makefile.am
  25. 103
      tests/tcsgrep.c

12
.gitattributes

@ -0,0 +1,12 @@
#
# Copyright (C) 2020 CismonX <admin@cismon.net>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty, provided the copyright notice and
# this notice are preserved. This file is offered as-is, without any warranty.
#
# Attributes for GitHub Linguist
*.h linguist-language=c
configure.ac linguist-detectable=false
Makefile.am linguist-detectable=false

47
.gitignore

@ -0,0 +1,47 @@
#
# Copyright (C) 2020 CismonX <admin@cismon.net>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty, provided the copyright notice and
# this notice are preserved. This file is offered as-is, without any warranty.
#
# IDE & plugins
.idea/
.vscode/
.ccls*
# OSX stuff
.DS_Store
# Autotools
autoscan.log
configure.scan
*.cache/
.deps/
config.*
configure
Makefile.in
Makefile
depcomp
compile
libtool
ltmain.sh
install-sh
missing
stamp-h1
.dirstamp
aclocal.m4
# build
*.o
*.lo
*.loT
*.la
*.lai
*.a
*.so
*.dylib
.libs/
examples/sixdraw
tests/tcsgrep

44
.travis.yml

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#
# Copyright (C) 2020 CismonX <admin@cismon.net>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty, provided the copyright notice and
# this notice are preserved. This file is offered as-is, without any warranty.
#
language: c
os:
- linux
- osx
dist: focal
compiler:
- gcc
- clang
addons:
apt:
update: true
packages:
- autoconf-archive
- dejagnu
homebrew:
update: true
packages:
- autoconf-archive
- dejagnu
branches:
only:
- master
before_script:
- test $TRAVIS_OS_NAME$CC = osxgcc && export CC=gcc-9 || true
script:
- autoreconf --install
- ./configure CFLAGS='-O0 -g -Wall -Wextra -Wpedantic'
- make
- sudo make install

674
COPYING

@ -0,0 +1,674 @@
GNU GENERAL PUBLIC LICENSE
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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.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
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.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
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
state 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 3 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 does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program 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, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU 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. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

59
INSTALL.org

@ -0,0 +1,59 @@
#
# Copyright (C) 2020 CismonX <admin@cismon.net>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty, provided the copyright notice and
# this notice are preserved. This file is offered as-is, without any warranty.
#
#+TITLE: Installation Guidelines
** Copy Library Code to Your Project
This is the recommended way to use this library. Just copy [[file:src/ctlseqs.h][ctlseqs.h]] and
[[file:src/ctlseqs.c][ctlseqs.c]] (and optionally the C++ wrapper [[file:src/ctlseqs.hh][ctlseqs.hh]]) to your project and
build it alongside with other code.
No precautions need to be taken, as ctlseqs has no third-party dependencies
and does not require any fancy compiler flags or CPP macros. An ISO C99 and
POSIX.1-2008 compliant C implementation would suffice.
** Build and Install From Source
Alternatively, You may want a systemwide installation of the library and
link it to your project. Some scripts are provided to help you with that.
GNU Autoconf, Automake, Libtool and Autoconf Archive is required.
Generate and execute configure script. There are no custom configuration
options available for this library, just builtin ones.
#+BEGIN_SRC shell
autoreconf --install
./configure --prefix=$HOME CFLAGS='-O0 -g'
#+END_SRC
Compile the library source code, as well as [[file:examples][examples]] and test suites.
Optionally, you can run the test suite (requires DejaGnu), install the
binary and man pages to your prefix.
#+BEGIN_SRC shell
make && make check && make install
#+END_SRC
Finally, link it to your project with the ~-lctlseqs~ (or similar) flag.
** Install From a Package Manager
We maintain unofficial repositories for a few package managers, so that the
ctlseqs library can be installed from them.
However, there is no guarantee that any of those repositories will be
actively maintained in the future.
*** Homebrew
#+BEGIN_SRC shell
brew tap CismonX/repos
brew install ctlseqs
#+END_SRC

9
Makefile.am

@ -0,0 +1,9 @@
#
# Copyright (C) 2020 CismonX <admin@cismon.net>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty, provided the copyright notice and
# this notice are preserved. This file is offered as-is, without any warranty.
#
SUBDIRS = src man tests examples

35
README.org

@ -0,0 +1,35 @@
#
# Copyright (C) 2020 CismonX <admin@cismon.net>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty, provided the copyright notice and
# this notice are preserved. This file is offered as-is, without any warranty.
#
#+TITLE: README
[[https://travis-ci.com/CismonX/ctlseqs][https://travis-ci.com/CismonX/ctlseqs.svg]]
[[file:COPYING][https://img.shields.io/badge/license-GPL--3.0--or--later-blue.svg]]
ctlseqs - helper library for terminal control sequences
** Description
The ctlseqs library provides low-level C API for manipulating terminal
emulators with control sequences.
This library 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 3 of the License, or (at your
option) any later version.
** Getting Started
Build from source or install from a package manager. See [[file:INSTALL.org][INSTALL.org]]
for details.
For documentation, see the [[man/ctlseqs.7][ctlseqs(7)]] man page, and also
[[https://invisible-island.net/xterm/ctlseqs/ctlseqs.html][XTerm Control Sequences]] if you're unfamiliar with them.
Some [[file:examples][examples]] are provided to demonstrate the basic usage of this
library.

50
configure.ac

@ -0,0 +1,50 @@
dnl
dnl Copyright (C) 2020 CismonX <admin@cismon.net>
dnl
dnl Copying and distribution of this file, with or without modification, are
dnl permitted in any medium without royalty, provided the copyright notice and
dnl this notice are preserved. This file is offered as-is, without any warranty.
dnl
AC_PREREQ([2.60])
AC_INIT([ctlseqs], [0.01], [bug-report@cismon.net])
AC_CONFIG_SRCDIR([src/ctlseqs.c])
AC_CONFIG_HEADERS([config.h])
AM_INIT_AUTOMAKE([foreign])
LT_PREREQ([2.4.0])
LT_INIT
# Checks for programs.
AC_PROG_CC_C99
AC_PROG_CXX
AC_PROG_AWK
AC_PROG_CPP
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_MAKE_SET
AC_PROG_RANLIB
# Checks for compiler builtins and attributes.
m4_ifdef([AX_GCC_BUILTIN], [
AX_GCC_BUILTIN(__builtin_expect)
AX_GCC_BUILTIN(__builtin_unreachable)
AX_GCC_FUNC_ATTRIBUTE(cold)
AX_GCC_FUNC_ATTRIBUTE(hot)
])
# Checks for header files.
AC_CHECK_HEADERS([fcntl.h limits.h stddef.h stdlib.h string.h sys/ioctl.h termios.h unistd.h])
# Checks for typedefs, structures, and compiler characteristics.
AC_CHECK_HEADER_STDBOOL
AC_C_INLINE
AC_TYPE_SIZE_T
AC_TYPE_SSIZE_T
# Checks for library functions.
AC_FUNC_MALLOC
AC_FUNC_REALLOC
AC_CHECK_FUNCS([dprintf memset strtoul])
AC_CONFIG_FILES([Makefile man/Makefile src/Makefile tests/Makefile examples/Makefile])
AC_OUTPUT

12
examples/Makefile.am

@ -0,0 +1,12 @@
#
# Copyright (C) 2020 CismonX <admin@cismon.net>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty, provided the copyright notice and
# this notice are preserved. This file is offered as-is, without any warranty.
#
AM_CPPFLAGS = -I$(top_srcdir)/src
noinst_PROGRAMS = sixdraw
sixdraw_SOURCES = sixdraw.c
sixdraw_LDADD = $(top_srcdir)/src/libctlseqs.la

283
examples/sixdraw.c

@ -0,0 +1,283 @@
/**
* sixdraw.c - draw lines on your terminal
*
* Requires sixel graphics and DEC locator support to run on your terminal.
* These features are not widely supported. To save yourself from trouble,
* use a latest version of XTerm or mlterm.
*
* Copyright (C) 2020 CismonX <admin@cismon.net>
*
* 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 3 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/>.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif // HAVE_CONFIG_H
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <unistd.h>
#include <ctlseqs.h>
#ifndef SIXDRAW_DEFAULT_TIMEOUT_MILLIS
# define SIXDRAW_DEFAULT_TIMEOUT_MILLIS 500
#endif // !SIXDRAW_DEFAULT_TIMEOUT_MILLIS
struct sixdraw_ctx {
struct termios termios;
union ctlseqs_value buffer[10];
char *prog_name;
struct ctlseqs_matcher *matcher;
struct ctlseqs_reader *reader;
bool has_termios;
bool show_cursor;
int in_fd;
int out_fd;
int timeout;
int rows;
int cols;
int ch_width;
int ch_height;
};
static inline void
sixdraw_print_error(struct sixdraw_ctx *ctx, char const *msg)
{
dprintf(ctx->out_fd, "%s: [error] %s.\n", ctx->prog_name, msg);
}
static inline void
sixdraw_clear_signal(int signum)
{
sigset_t sigset;
sigemptyset(&sigset);
sigaddset(&sigset, signum);
sigwait(&sigset, &signum);
}
static bool
sixdraw_handle_signals(struct sixdraw_ctx *ctx)
{
sigset_t sigset;
sigpending(&sigset);
if (!sigismember(&sigset, SIGWINCH)) {
return false;
}
sixdraw_clear_signal(SIGWINCH);
return true;
}
static void
sixdraw_terminate(struct sixdraw_ctx *ctx)
{
ctlseqs_matcher_free(ctx->matcher);
ctlseqs_reader_free(ctx->reader);
// Restore original terminal modes
if (ctx->has_termios) {
tcsetattr(ctx->in_fd, TCSANOW, &ctx->termios);
}
}
static bool
sixdraw_get_winsize(struct sixdraw_ctx *ctx)
{
struct winsize ws = { 0 };
if (ioctl(ctx->in_fd, TIOCGWINSZ, &ws) != 0) {
return false;
}
if (ws.ws_xpixel == 0 || ws.ws_ypixel == 0) {
return false;
}
ctx->rows = ws.ws_row;
ctx->cols = ws.ws_col;
ctx->ch_width = ws.ws_xpixel / ws.ws_col;
ctx->ch_height = ws.ws_ypixel / ws.ws_row;
dprintf(ctx->out_fd, "%d %d \n%d %d %d %d\n", ws.ws_xpixel, ws.ws_ypixel, ctx->rows, ctx->cols, ctx->ch_width, ctx->ch_height);
return true;
}
static bool
sixdraw_init(struct sixdraw_ctx *ctx, int argc, char **argv)
{
*ctx = (struct sixdraw_ctx) {
.prog_name = argc > 0 ? argv[0] : "sixdraw",
.in_fd = STDIN_FILENO,
.out_fd = STDOUT_FILENO,
.timeout = SIXDRAW_DEFAULT_TIMEOUT_MILLIS,
};
// Process command line arguments
int opt;
while (-1 != (opt = getopt(argc, argv, "t:"))) {
switch (opt) {
case 't':
ctx->timeout = atoi(optarg);
break;
case '?':
default:
return false;
}
}
// Initialize control sequence matcher
ctx->matcher = ctlseqs_matcher_init();
if (ctx->matcher == NULL) {
sixdraw_print_error(ctx, "failed to initialize matcher");
return false;
}
char const *patterns[] = {
CTLSEQS_RESP_PRIMARY_DA(CTLSEQS_PH_NUMS),
CTLSEQS_RESP_DECRQM(CTLSEQS_PH_NUM, CTLSEQS_PH_NUM)
};
struct ctlseqs_matcher_opts options = {
.patterns = patterns,
.npatterns = sizeof(patterns) / sizeof(char const *),
};
if (ctlseqs_matcher_setopt(ctx->matcher, &options) != 0) {
sixdraw_print_error(ctx, "failed to set matcher options");
return false;
}
// Initialize control sequence reader
ctx->reader = ctlseqs_reader_init();
if (ctx->reader == NULL) {
sixdraw_print_error(ctx, "failed to initialize reader");
return false;
}
struct ctlseqs_reader_opts reader_opts = {
.buffer = ctx->buffer,
.fd = ctx->in_fd,
.maxlen = 32,
};
if (ctlseqs_reader_setopt(ctx->reader, &reader_opts) != CTLSEQS_OK) {
sixdraw_print_error(ctx, "failed to set reader options");
return false;
}
// Block SIGWINCH
sigset_t sigset;
sigemptyset(&sigset);
sigaddset(&sigset, SIGWINCH);
sigprocmask(SIG_BLOCK, &sigset, NULL);
signal(SIGWINCH, SIG_DFL);
return true;
}
static bool
sixdraw_prepare(struct sixdraw_ctx *ctx)
{
// Check whether we're running on a terminal
if (!isatty(ctx->in_fd) || !isatty(ctx->out_fd)) {
sixdraw_print_error(ctx, "this program can only run in a terminal");
return false;
}
// Set terminal to noncanonical mode
struct termios termios;
if (tcgetattr(ctx->in_fd, &ctx->termios) != 0) {
sixdraw_print_error(ctx, "failed to get terminal attributes");
return false;
}
termios = ctx->termios;
termios.c_lflag &= ~(ICANON | ISIG | ECHO);
if (tcsetattr(ctx->in_fd, TCSANOW, &termios) != 0) {
sixdraw_print_error(ctx, "failed to get terminal attributes");
return false;
}
ctx->has_termios = true;
// Set STDIN flags to non-blocking
int flags = fcntl(ctx->in_fd, F_GETFL);
if (flags == -1) {
sixdraw_print_error(ctx, "failed to get file status flags");
return false;
}
if (fcntl(ctx->in_fd, F_SETFL, flags | O_NONBLOCK) == -1) {
sixdraw_print_error(ctx, "failed to set file status flags");
return false;
}
// Get initial terminal window size
if (!sixdraw_get_winsize(ctx)) {
sixdraw_print_error(ctx, "failed to get terminal window size");
return false;
}
return true;
// Check terminal support for sixel graphics and DEC locator
dprintf(ctx->out_fd, CTLSEQS_PRIMARY_DA());
ssize_t result = ctlseqs_read(ctx->reader, ctx->matcher, 500);
if (result != 0) {
sixdraw_print_error(ctx, "failed to get terminal attributes");
return false;
}
bool has_sixel = false;
bool has_dec_locator = false;
union ctlseqs_value *buffer = ctx->buffer;
for (size_t i = 1; i <= buffer[0].num; ++i) {
if (buffer[i].num == 4) {
has_sixel = true;
} else if (buffer[i].num == 29) {
has_dec_locator = true;
}
}
if (!has_sixel) {
sixdraw_print_error(ctx, "terminal does not support sixel graphics");
return false;
}
if (!has_dec_locator) {
sixdraw_print_error(ctx, "terminal does not support DEC locator mode");
return false;
}
// Get current cursor status
dprintf(ctx->out_fd, CTLSEQS_DECRQM("25"));
result = ctlseqs_read(ctx->reader, ctx->matcher, ctx->timeout);
if (result != 1) {
sixdraw_print_error(ctx, "failed to get cursor status");
return false;
}
if (buffer[0].num != 25 || (buffer[1].num != 1 && buffer[1].num != 2)) {
sixdraw_print_error(ctx, "cursor status not recognizable");
return false;
}
ctx->show_cursor = buffer[1].num == 1;
return true;
}
int
main(int argc, char **argv)
{
int status = 0;
struct sixdraw_ctx ctx;
if (!sixdraw_init(&ctx, argc, argv) || !sixdraw_prepare(&ctx)) {
status = -1;
goto terminate;
}
terminate:
sixdraw_terminate(&ctx);
return status;
}

12
man/Makefile.am

@ -0,0 +1,12 @@
#
# Copyright (C) 2020 CismonX <admin@cismon.net>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty, provided the copyright notice and
# this notice are preserved. This file is offered as-is, without any warranty.
#
dist_man3_MANS = ctlseqs_matcher_init.3 ctlseqs_matcher_setopt.3 ctlseqs_matcher_free.3 \
ctlseqs_reader_init.3 ctlseqs_reader_setopt.3 ctlseqs_read.3 ctlseqs_reader_free.3
dist_man7_MANS = ctlseqs.7

66
man/ctlseqs.7

@ -0,0 +1,66 @@
.TH CTLSEQS 7 "Sep 01, 2020" 0.1.0 "Ctlseqs Library Manual"
.
.SH NAME
ctlseqs - helper library for terminal control sequences
.
.SH SYNOPSIS
.nf
.B #include <ctlseqs.h>
.PP
.B #define __cplusplus 201103L
.BR "#include <ctlseqs.hh>" " /* C++ Wrapper */"
.fi
.
.SH DESCRIPTION
The ctlseqs library provides low-level API for manipulating terminal emulators with control sequences.
.SS Terminal escape sequences
Terminals and hosts exchange control information regarding colors, font styles, cursor position, etc., using escape sequences embedded in normal text.
.PP
In distant past, when there are no standard protocols to apply, those escape sequences are largely vendor-specific.
We can assume that most, if not all modern terminal emulators recognize ANSI-compliant escape sequences, as well as supporting popular control functions like the ones shipped with DEC VT100 series.
However, this is not guaranteed, and using raw escape sequences is prone to broken compatibility.
.PP
While most text-based applications should stick to terminfo/ncurses, there are occasions when dealing with raw escape sequences is inevitable.
For example, when trying to make use of proprietary features provided by a specific terminal emulator.
Or perhaps, when implementing one's own terminal emulator.
.PP
Writing escape sequences is pretty straightforward, but reading and processing them could be tricky, and not trivial to implement.
.SS The ctlseqs library
The ctlseqs library tries to make your life easier when dealing with raw escape sequences.
There are three major concepts in the library, the reader, the matcher, and the helper macros.
.PP
The reader is responsible to read arbitrary data from a file descriptor, buffer it, and check whether it (or part of it) is a valid terminal control sequence.
.PP
The matcher is configured with patterns describing a terminal control sequence.
After a sequence is successfully read, it can be matched against the patterns, and according to which, values can be extracted.
.PP
The helper macros include C0 (7-bit) control characters, commonly used control sequences (mostly CSI sequences) from DEC VTxxx series and XTerm, and placeholders.
Helper macros always expand to string literals.
.PP
For reader/matcher details, see the corresponding man page in section 3.
For helper macro details, see the source code of the
.I ctlseqs.h
header.
.
.SH BUGS
C1 (8-bit) control characters are not supported.
.
.SH SEE ALSO
.BR terminfo (5),
.BR ncurses (3X)
.PP
.BR ctlseqs_matcher_init (3),
.BR ctlseqs_matcher_setopt (3),
.BR ctlseqs_matcher_free (3)
.PP
.BR ctlseqs_reader_init (3),
.BR ctlseqs_reader_setopt (3),
.BR ctlseqs_reader_free (3)
.PP
.BR ctlseqs_read (3)
.
.SH COPYRIGHT
Copyright (c) 2020 CismonX <admin@cismon.net>
.PP
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty, provided the copyright notice and this notice are preserved.
This file is offered as-is, without any warranty.

34
man/ctlseqs_matcher_free.3

@ -0,0 +1,34 @@
.TH CTLSEQS_MATCHER_FREE 3 "Sep 01, 2020" 0.1.0 "Ctlseqs Library Manual"
.
.SH NAME
ctlseqs_matcher_free - free control sequence matcher
.
.SH SYNOPSYS
.nf
.B #include <ctlseqs.h>
.PP
.BI "void ctlseqs_matcher_free(struct ctlseqs_matcher *" matcher ");"
.fi
.
.SH DESCRIPTION
Destroys a
.I matcher
instance created by
.BR ctlseqs_matcher_init ()
and release its holding memory.
.PP
If
.I matcher
is NULL, this function has no effect.
.
.SH RETURN VALUE
This function has no return values.
.
.SH SEE ALSO
.BR ctlseqs_matcher_init (3)
.
.SH COPYRIGHT
Copyright (c) 2020 CismonX <admin@cismon.net>
.PP
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty, provided the copyright notice and this notice are preserved.
This file is offered as-is, without any warranty.

35
man/ctlseqs_matcher_init.3

@ -0,0 +1,35 @@
.TH CTLSEQS_MATCHER_INIT 3 "Sep 01, 2020" 0.1.0 "Ctlseqs Library Manual"
.
.SH NAME
ctlseqs_matcher_init - initialize control sequence matcher
.
.SH SYNOPSYS
.nf
.B #include <ctlseqs.h>
.PP
.B struct ctlseqs_matcher *ctlseqs_matcher_init(void);
.fi
.
.SH DESCRIPTION
Creates a control sequence matcher, which can be configured with
.BR ctlseqs_matcher_setopt ().
.PP
Instance of a control sequence matcher should be freed with
.BR ctlseqs_matcher_free ().
.
.SH RETURN VALUE
Returns a pointer to opaque type
.B struct ctlseqs_matcher
holding the matcher instance.
.PP
If the function fails to allocate sufficient memory, returns NULL.
.
.SH SEE ALSO
.BR ctlseqs_matcher_setopt (3),
.BR ctlseqs_matcher_free (3)
.
.SH COPYRIGHT
Copyright (c) 2020 CismonX <admin@cismon.net>
.PP
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty, provided the copyright notice and this notice are preserved.
This file is offered as-is, without any warranty.

63
man/ctlseqs_matcher_setopt.3

@ -0,0 +1,63 @@
.TH CTLSEQS_MATCHER_SETOPT 3 "Sep 01, 2020" 0.1.0 "Ctlseqs Library Manual"
.
.SH NAME
ctlseqs_matcher_setopt - set control sequence matcher options
.
.SH SYNOPSYS
.nf
.B #include <ctlseqs.h>
.PP
.BI "int ctlseqs_matcher_setopt(struct ctlseqs_matcher *" matcher ,
.BI " struct ctlseqs_matcher_opts const *" options );
.fi
.
.SH DESCRIPTION
Changes the properties of the given
.IR matcher .
.PP
The
.I options
argument is a pointer to a
.BR "struct ctlseqs_matcher_opts" ,
whose definition is shown below:
.PP
.nf
.in +4n
.EX
struct ctlseqs_matcher_opts {
char const *const *patterns;
size_t npatterns;
};
.EE
.in
.fi
.PP
Field
.I patterns
is an array of pointers to NUL-terminated strings, each of which represents a pattern of control sequences.
.PP
Field
.I npatterns
is the number of strings provided in
.IR patterns .
.PP
Multiple calls on the same
.I matcher
will discard all data from previous calls.
.
.SH RETURN VALUE
.TP
.B CTLSEQS_OK
Success.
.TP
.B CTLSEQS_NOMEM
Fails to allocate sufficient memory.
.
.SH SEE ALSO
.BR ctlseqs (7)
.
.SH COPYRIGHT
Copyright (c) 2020 CismonX <admin@cismon.net>
.PP
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty, provided the copyright notice and this notice are preserved.
This file is offered as-is, without any warranty.

99
man/ctlseqs_read.3

@ -0,0 +1,99 @@
.TH CTLSEQS_READ 3 "Sep 01, 2020" 0.1.0 "Ctlseqs Library Manual"
.
.SH NAME
ctlseqs_read - read control sequence
.
.SH SYNOPSYS
.nf
.B #include <ctlseqs.h>
.PP
.BI "ssize_t ctlseqs_read(struct ctlseqs_reader *" reader ,
.BI " struct ctlseqs_matcher const *" matcher ", int " timeout );
.fi
.
.SH DESCRIPTION
Attempts to read a terminal control sequence, and extract values according to given patterns.
.PP
The
.I reader
argument specifies the behaviour of the read operation, which can be configured with
.BR ctlseqs_reader_setopt ().
.PP
The
.I matcher
argument specifies the expected patterns of control sequences to be matched upon after a successful read, which can be configured with
.BR ctlseqs_matcher_setopt ().
A NULL
.I matcher
is allowed, acting as if
.I npatterns
is 0.
.PP
Argument
.I timeout
is the maximum duration of time (in milliseconds) to wait until any data can be read.
If
.I timeout
is -1, the function blocks indefinitely. If option
.B CTLSEQS_READER_NO_POLL
is enabled, this argument has no effect.
.
.SH RETURN VALUE
If a control sequence is successfully read, and matches at least one pattern in
.IR matcher ,
returns a non-negative integer representing the offset of one of the matching patterns.
.PP
Otherwise, returns a negative value:
.TP
.B CTLSEQS_NOMATCH
A control sequence is successfully read, but fails to match any pattern in
.IR matcher .
.TP
.B CTLSEQS_PARTIAL
Data is read successfully and can be recognized as part of a control sequence, but is not yet terminated.
.TP
.B CTLSEQS_NOSEQ
Data is read successfully, but cannot be recognized as a valid control sequence.
.TP
.B CTLSEQS_TIMEOUT
The specified
.I timeout
has expired, and no data is read.
.TP
.B CTLSEQS_EOF
End-of-file is encountered, and no data is read.
.TP
.B CTLSEQS_ERROR
An unexpected error occurs during a system call within the function.
.TP
.B CTLSEQS_INTR
A system call within the function is interrupted by a signal, and no data is read.
.
.SH NOTES
Any pattern in
.I matcher
must be a ECMA-35/ECMA-48 conformant escape sequence, and should also be recognizable by the matcher.
Otherwise, function behaviour is undefined.
.PP
Currently supported escape sequences:
.TP
.B CSI [param...] [intmd...] final
Parameter bytes are of range 0x30\(ti0x3f, intermediate bytes 0x20\(ti0x2f, and final byte 0x40\(ti0x7e.
.TP
.B (APC|DCS|OSC|PM) [cmdstr] ST
Command string consists of bytes of printable characters and characters of range 0x08\(ti0x0d.
.TP
.B (SS2|SS3) ch
The byte following a single-shift should be a printable character.
.TP
.B SOS [chrstr] ST
Character string can be any bit combination which does not represent SOS or ST.
.SH SEE ALSO
.BR ctlseqs_matcher_setopt (3),
.BR ctlseqs_reader_setopt (3)
.
.SH COPYRIGHT
Copyright (c) 2020 CismonX <admin@cismon.net>
.PP
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty, provided the copyright notice and this notice are preserved.
This file is offered as-is, without any warranty.

34
man/ctlseqs_reader_free.3

@ -0,0 +1,34 @@
.TH CTLSEQS_MATCHER_FREE 3 "Sep 01, 2020" 0.1.0 "Ctlseqs Library Manual"
.
.SH NAME
ctlseqs_reader_free - free control sequence reader
.
.SH SYNOPSYS
.nf
.B #include <ctlseqs.h>
.PP
.BI "void ctlseqs_reader_free(struct ctlseqs_reader *" reader ");"
.fi
.
.SH DESCRIPTION
Destroys a
.I reader
instance created by
.BR ctlseqs_reader_init ()
and release its holding memory.
.PP
If
.I reader
is NULL, this function has no effect.
.
.SH RETURN VALUE
This function has no return values.
.
.SH SEE ALSO
.BR ctlseqs_reader_init (3)
.
.SH COPYRIGHT
Copyright (c) 2020 CismonX <admin@cismon.net>
.PP
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty, provided the copyright notice and this notice are preserved.
This file is offered as-is, without any warranty.

35
man/ctlseqs_reader_init.3

@ -0,0 +1,35 @@
.TH CTLSEQS_READER_INIT 3 "Sep 01, 2020" 0.1.0 "Ctlseqs Library Manual"
.
.SH NAME
ctlseqs_reader_init - initialize control sequence reader
.
.SH SYNOPSYS
.nf
.B #include <ctlseqs.h>
.PP
.B struct ctlseqs_reader *ctlseqs_reader_init(void);
.fi
.
.SH DESCRIPTION
Creates a control sequence reader, which can be configured with
.BR ctlseqs_reader_setopt ().
.PP
Instance of a control sequence reader should be freed with
.BR ctlseqs_reader_free ().
.
.SH RETURN VALUE
Returns a pointer to opaque type
.B struct ctlseqs_reader
holding the reader instance.
.PP
If the function fails to allocate sufficient memory, returns NULL.
.
.SH SEE ALSO
.BR ctlseqs_reader_setopt (3),
.BR ctlseqs_reader_free (3)
.
.SH COPYRIGHT
Copyright (c) 2020 CismonX <admin@cismon.net>
.PP
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty, provided the copyright notice and this notice are preserved.
This file is offered as-is, without any warranty..

154
man/ctlseqs_reader_setopt.3

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.TH CTLSEQS_READER_SETOPT 3 "Sep 01, 2020" 0.1.0 "Ctlseqs Library Manual"
.
.SH NAME
ctlseqs_reader_setopt - set control sequence reader options
.
.SH SYNOPSYS
.nf
.B #include <ctlseqs.h>
.PP
.BI "int ctlseqs_reader_setopt(struct ctlseqs_reader *" reader ,
.BI " struct ctlseqs_reader_opts const *" options );
.fi
.
.SH DESCRIPTION
Function
.BR ctlseqs_reader_setopt ()
changes the properties of the given
.IR reader .
.PP
The
.I options
argument is a pointer to a
.BR "struct ctlseqs_reader_opts" ,
as shown below:
.PP
.nf
.in +4n
.EX
struct ctlseqs_reader_opts {
union ctlseqs_value *buffer;
size_t maxlen;
int fd;
unsigned flags;
};
.EE
.in
.fi
.PP
Field
.I buffer
is the pointer to the buffer where the values extracted from the matching sequence of
.BR ctlseqs_read ()
will be stored.
.PP
Field
.I maxlen
specifies the maximum possible length (in bytes) of control sequence to be read.
.PP
Field
.I fd
is the file descriptor to read from.
.PP
Field
.I flags
is the bit mask of multiple boolean options.
.SS Buffer Values
A
.I buffer
is an array of
.BR "union ctlseqs_value" ,
as shown below:
.PP
.nf
.in +4n
.EX
union ctlseqs_value {
char const *str;
unsigned long num;
};
.EE
.in
.fi
.PP
The value can be either a string (not guaranteed to be NUL-terminated), or an unsigned integer.
Once a sequence is successfully matched, a group of values is extracted from the sequence for each placeholder, and stored into the buffer sequentially.
.PP
A group can contain one or multiple values, depending on different placeholders:
.TP
.B CTLSEQS_PH_NUM
A single unsigned integer.
.TP
.B CTLSEQS_PH_NUMS
An unsigned integer indicating the number of extracted values, followed by unsigned integers of that many.
.TP
.B CTLSEQS_PH_STR
An unsigned integer indicating the number of characters of the extracted string, followed by a string of printable characters.
.TP
.B CTLSEQS_PH_CMDSTR
An unsigned integer indicating the number of characters of the extracted string, followed by a string containing only printable characters and characters of range 0x08\(ti0x0d.
.TP
.B CTLSEQS_PH_CSI_PARAM
An unsigned integer indicating the number of characters of the extracted string, followed by a string of CSI parameter bytes (range 0x30\(ti0x3f).
.TP
.B CTLSEQS_PH_CSI_INTMD
An unsigned integer indicating the number of characters of the extracted string, followed by a string of CSI intermediate bytes (range 0x20\(ti0x2f).
.TP
.B CTLSEQS_PH_HEXNUM
A single unsigned integer, which is the integer value of extracted hexadecimal string.
.TP
.B CTLSEQS_PH_CHRSTR
An unsigned integer indicating the number of characters of the extracted string, followed by a string of any bit combination which does not represent SOS or ST.
.PP
If the
.BR ctlseqs_read ()
call returns
.BR CTLSEQS_NOSEQ ,
.B CTLSEQS_NOMATCH
or
.BR CTLSEQS_PARTIAL ,
the length of the entire string followed by the string itself will be stored into the buffer.
.SS Flags
.TP
.B CTLSEQS_READER_NO_POLL
In a
.BR ctlseqs_read ()
call, do not
.BR poll ()
before
.BR read ().
You may want this option enabled if
.I fd
is maintained in an event loop.
.TP
.B CTLSEQS_READER_RETAIN_PARTIAL
When
.BR ctlseqs_read ()
returns
.BR CTLSEQS_PARTIAL ,
preserve the partially matched sequence in the internal buffer for future calls.
.
.SH RETURN VALUE
.TP
.B CTLSEQS_OK
Success.
.TP
.B CTLSEQS_NOMEM
Fails to allocate sufficient memory.
.SH BUGS
After a successful
.BR ctlseqs_read ()
call, changing
.I maxlen
to a smaller value on the same
.I reader
may result in data loss due to truncation of the internal read buffer.
.
.SH SEE ALSO
.BR ctlseqs_read (3)
.
.SH COPYRIGHT
Copyright (c) 2020 CismonX <admin@cismon.net>
.PP
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty, provided the copyright notice and this notice are preserved.
This file is offered as-is, without any warranty.

21
src/Makefile.am

@ -0,0 +1,21 @@
##
## Copyright (C) 2020 CismonX <admin@cismon.net>
##
## This file 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 3 of the License, or
## (at your option) any later version.
##
## This file 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 file. If not, see <https://www.gnu.org/licenses/>.
##
lib_LTLIBRARIES = libctlseqs.la
libctlseqs_la_SOURCES = ctlseqs.c
include_HEADERS = ctlseqs.h ctlseqs.hh