This equality check only works if the LHS is evaluated before the RHS, but this is not guaranteed by the standard. We can fix this by checking that the snprintf return value is less than the maximum buffer length, which also avoids an unnecessary traversal of the string.
|11 months ago|
|infocmp||4 years ago|
|libcurses||2 years ago|
|libform||2 years ago|
|libmenu||2 years ago|
|libpanel||4 years ago|
|libterminfo||9 months ago|
|nbperf||5 years ago|
|netbsd_sys||2 years ago|
|tabs||2 years ago|
|terminfo||3 years ago|
|tic||3 years ago|
|tput||5 years ago|
|tset||4 years ago|
|.gitignore||4 years ago|
|COPYING||5 years ago|
|GNUmakefile||4 years ago|
|README.md||2 years ago|
|genpc||5 years ago|
|install.sh||5 years ago|
this is a port of netbsd's curses library for usage on Linux systems (tested and developed on sabotage linux, based on musl libc). It should be possible to use on other POSIX platforms as well with minor changes.
it supports widechar (like the ncursesw build variant) and is close to being a 100% feature-complete drop-in replacement for ncurses.
to this date, there are only 3 implementations of the curses API:
Competition is good.
Ncurses is one of the most used libraries in the linux ecosystem and therefore it's usually one of the first libraries built in a source-based distro. There's basically no way around it, unless you're building a single-purpose appliance.
Readability/Hacking. even though ncurses is free software, it is very hard to change its source code:
Usability. the default configuration of ncurses is usually not what one wants, and it features several dozens of configure options to customize the build, for example making it split up in several smaller libraries, with or without widechar support, etc.
this makes it hard to guess which files to link against and which headers to
use when building a package against ncurses.
-lncursesw -lterminfo -ltic?
this filename chaos is often fixed in a distro-specific manner.
to accomodate for this, ncurses ships its own config tool ncurses(w)5-config instead of a standardized pkg-config description file (disabled by default) to query the necessary CFLAGS and LDFLAGS. unfortunately like every other homebrewed pkg-config replacement, this config utility was designed without cross-compilation in mind, so many packages using ncurses and autoconf fail to cross-compile when unpatched.
Size and build time.
|Size of extracted source||15.8 MB||3.3 MB|
|Installed size||15.9 MB||1.3 MB|
|Installed size w/debuginfo||128.3 MB||19.9 MB|
|Build time (make -j2)||59 sec||9 sec|
|size of libncursesw.so||346 KB||150 KB|
|size of static linked nano||334 KB||288 KB|
when scaling up to more build jobs, it is expected that netbsd curses fares a lot better since its Makefile is fully parallelizable, while ncurses spends a lot of time in a single process executing the configure script.
netbsd-curses ships without a configure script, and requires GNU make. variables for compilation can be passed directly to make, or be saved into config.mak. recognized variables are:
make CFLAGS="-Os -Wall -fPIC" PREFIX=/usr/local -j4 all install make CFLAGS=-O2 LDFLAGS=-static PREFIX=/usr all-static install-static
CFLAGS = -O3 -Wall PREFIX = /usr DESTDIR = foo
if you're using config.mak, you can just run
make && make install and the
variables will be picked up automatically.
install Makefile targets will build/install all programs,
shared and static libs, and headers.
install-static targets will build/install all programs,
static libs, and headers.
install-dynamic targets will build/install all programs
shared libs, and headers.
all build can be sped up by putting
-fPIC in CFLAGS.
this has the effect that the same object files will be used for the dynamic and
static libs; otherwise they will be compiled twice with different CFLAGS.
support for about a dozen common TERMs is built-in already. if you need one
that's not included, you can either add yours to
make terminfo/terminfo.cdb and install the result to either
the functionality that ncurses offers is usually (if not configured to split
into several separate libs) available in a single
netbsd-curses on the other hand has it always split into
this difference requires to give the build system a hint that it needs to
link to both libcurses and libterminfo.
programs using pkg-config(1) automatically get the right options due to the supplied .pc files.
for autoconf based software (using a configure script) it is usually sufficient to invoke configure like this:
LIBS="-lcurses -lterminfo" ./configure ...
for Makefile-only based build systems, it should be sufficient to add the libs to LDFLAGS:
make LDFLAGS="-lcurses -lterminfo" ...
with these instructions it is easy to compile the majority of ncurses apps without problems against netbsd-curses.
a small percentage of apps written for ncurses poke at internals and need light patching:
if you have trouble compiling a specific package, first look at the sabotage linux build recipes. if you still can't get the package to compile, feel free to open an issue at the netbsd-curses issue tracker.
libcurses, tset and tput are (C) 1980-1994 "The Regents of the University of California" licensed under the 3-clause BSD license. Everything else is (C) 1999-2016 The NetBSD Foundation, Inc. and Contributors, licensed under the 2-clause BSD license. see COPYING for the full text, and in doubt, consult the copyright clauses in the respective .c files. Files without copyright clauses in the file header are explicitly released under the terms of the 2-clause BSD license as well.
All tests were done on a dual core x86_64 sabotage linux system, with the following features: installation of shared and static libs, headers, etc, i.e. make -j2 all install. ncurses and netbsd curses were both configured with support for widechars, and built-in terminfo database for a handful of terminals.
CFLAGS (optimized for size): -g0 -fdata-sections -ffunction-sections -Os -fno-unwind-tables -fno-asynchronous-unwind-tables -Wa,--noexecstack LDFLAGS: -s -Wl,--gc-sections -Wl,-z,relro,-z,now
netbsd curses was installed without manpages (ncurses: 1.1 MB) and terminfo database (ncurses: 6.4MB). the debug info build was created with -g3 and debuginfo stripped into external files via objcopy.
Thomas Dickey did a thorough investigation on the history of NetBSD curses.