The algorithm had some areas which had potential for improvement.
This should make cmp(1) faster.
There have been changes to behaviour as well:
1) If argv[0] and argv[1] are the same, cmp(1) returns Same.
2) POSIX specifies the format of the difference-message to be:
"%s %s differ: char %d, line %d\n", file1, file2,
<byte number>, <line number>
However, as cmp(1) operates on bytes, not characters, I changed
it to
"%s %s differ: byte %d, line %d\n", file1, file2,
<byte number>, <line number>
This is one example where the standard just keeps the old format
for backwards-compatibility. As this is harmful, this change
makes sense in the sense of consistentcy (and because we take
the difference of char and byte very seriously in sbase, as
opposed to GNU coreutils).
The manpage has been annotated, reflecting the second change, and
sections shortened where possible.
Thus I marked cmp(1) as finished in README.
sbase - suckless unix tools
===========================
sbase is a collection of unix tools that are inherently portable
across UNIX and UNIX-like systems.
The following tools are implemented ('*' == finished, '#' == UTF-8 support,
'=' == implicit UTF-8 support):
UTILITY POSIX 2008 COMPLIANT MISSING OPTIONS
------- -------------------- ---------------
=* basename yes none
=* cal yes none
=* cat yes none
= chgrp no -h, -H, -L, -P
=* chmod yes none
= chown no -h, -H, -L, -P
=* chroot non-posix none
=* cksum yes none
=* cmp yes none
#* cols non-posix none
=* comm yes none
= cp no -H, (-i), -L
=* cron non-posix none
#* cut yes none
=* date yes none
=* dirname yes none
= du no -H, -L, (-x)
=* echo yes none
=* env yes none
#* expand yes none
=* expr yes none
=* false yes none
#* fold yes none
=* grep yes none
=* head yes none
=* hostname non-posix none
=* kill yes none
=* link yes none
=* ln yes none
=* logger yes none
=* logname yes none
= ls no -C, -R, -q, -u
=* md5sum non-posix none
=* mkdir yes none
=* mkfifo yes none
=* mktemp non-posix none
=* mv yes (-i)
=* nice yes none
= nl no -d, -f, -h, -l, -n, -p, -v, -w
=* nohup yes none
#* paste yes none
=* printenv non-posix none
printf stolen stolen
=* pwd yes none
= readlink non-posix -e, -m
=* renice yes none
=* rm yes (-i)
=* rmdir yes none
=* setsid non-posix none
=* sleep yes none
sort no -m, -o, -d, -f, -i
=* split yes none
= sponge non-posix none
strings no -a, -n, -t
= sync non-posix none
= tail no -c, -f
= tar non-posix none
=* tee yes none
test yes none
= touch no -r
#* tr yes none
=* true yes none
= tty yes none
= uname yes none
# unexpand yes none
= uniq no -f, -s
= unlink yes none
= uudecode no -o
= uuencode no -m
seq non-posix none
= sha1sum non-posix none
= sha256sum non-posix none
= sha512sum non-posix none
#* wc yes none
= xargs no -I, -L, -p, -s, -t, -x
=* yes non-posix none
The complement of sbase is ubase[1] which is Linux-specific and
provides all the non-portable tools. Together they are intended to
form a base system similar to busybox but much smaller and suckless.
Building
--------
To build sbase, simply type make. You may have to fiddle with
config.mk depending on your system.
You can also build sbase-box, which generates a single binary
containing all the required tools. You can then symlink the
individual tools to sbase-box.
Ideally you will want to statically link sbase. If you are on Linux
we recommend using musl-libc[2].
Portability
-----------
sbase has been compiled on a variety of different operating systems,
including Linux, *BSD, OSX, Haiku, Solaris, SCO OpenServer and others.
Various combinations of operating systems and architectures have also
been built.
You can build sbase with gcc, clang, tcc, nwcc and pcc.
[1] http://git.suckless.org/ubase/
[2] http://www.musl-libc.org/
79e45395e5