execl(3) and its variants use a sentinel to terminate the variadic
argument list, in the form of a null pointer constant of type pointer to
char. POSIX mandates that NULL is a null pointer constant of type
pointer to void, which is not of an equivalent type to that required by
execl(3) and its variants, resulting in undefined behaviour.
This commit casts all such instances of NULL to pointer to char type.
For consistency, it also adds const-qualification to any such instances
which had already been casted, and were not const-qualified.
I hereby relicense all my work on Sortix under the ISC license as below.
All Sortix contributions by other people are already under this license,
are not substantial enough to be copyrightable, or have been removed.
All imported code from other projects is compatible with this license.
All GPL licensed code from other projects had previously been removed.
Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors.
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
New options:
-1 Disable columnizing.
-c Sort by file status change time.
-C Column directory entries.
-h Show file sizes with magnitude suffixes such as 42.3K.
-r Sort entries in the opposite order.
-R Recursively list directory contents.
-S Sort by file size in decreasing order.
-u Sort by access time.
--color=always|auto|never
Control whether colorizing is enabled.
The output is now natively columnized instead of running a column(1)
subprocess. Multiple operands are now implemented correctly (directory
contents are columned separately rather than their concatenation, the name
of each directory is printed prior to its content, ...). The file owner and
group names are now shown rather than a hard-coded root. Long listings are
now properly aligned. Mixing file and directory operands works correctly
now. Columnizing is now vertical rather than across. Clean up the source
code and remove cruft. Stat information on directory entries are read once
only now, which which fixes an incosistent sort race condition when sorting
according to lstat. Move to the openat paradigm.
