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History log of /src/usr.bin/sort/sort.c
RevisionDateAuthorComments
 1.64  10-Jan-2017  christos refactor includes, add <sys/stat.h>
 1.63  01-Jun-2016  wiz branches: 1.63.2;
Sort options and their descriptions. Sync usage more with man page.
Bump date in man page for new option -C.
 1.62  01-Jun-2016  kre Add the posix -C option (-c but quieter). Fix -R to work properly when
setting \n as the record delimited using a numeric value rather than literal
\n - and to not incorrectly turn \n into a field separator if -R is used to
make some other char the record separator (\n becomes a field separator in
that case as long as the field separator remains "white space" but should not
be in any other case - unless set explicitly of course.)

Plus more cosmetic changes - the man page and usage are updated to make it
more clear that the 2 (or 1) params to -k are not fields (field1 and field2)
but specifiers of the beginning and end of one key field. There was an
unused 'x' option in the GETOPTS string. The usage message is reformatted
to display properly on both 80 col and > 80 col displays (on < 80 it will
still probably look pretty ugly ... perhaps not quite so bad though), and
is also updated to show the different usage for the -c case (and -C) from the
others (only 1 file permitted) - the man page synopsis has a similar update.

Using more than one of -c -C or -m generates a usage message rather than
just ignoring the -m as it did before (there was no -C before of course).

Aside from the bug fix to the interaction between -R and -t, there are no
changes that affect the way anything is sorted (or read, or written).

Discussed on tech-userlevel earlier this week.
 1.61  16-Sep-2011  joerg Use __dead
 1.60  18-Dec-2010  christos Add an 'l' style for sorting that sorts by the string length of the field.
 1.59  05-Jun-2010  dholland fixit() needs to know the getopt options list to do its thing correctly.
 1.58  05-Feb-2010  enami Don't touch past the end of allocated region. It results segmentation
violation.
 1.57  06-Nov-2009  joerg Retire __SCCSID. It has only archeological value now. Also retire lint
conditional around __RCSID, lint can handle that fine.
 1.56  26-Sep-2009  dsl Move all the fopen() calls out of the record read routines into the callers.
Split the merge sort so that fsort() can pass the 'FILE *' of the temporary
files to be merged into the merge code.
Don't rely on realloc() not moving the end address of a buffer!
Rework merge sort so that it sorts pointers to 'struct mfile' and only
copies about sort record descriptors.
No functional change intended.
 1.55  10-Sep-2009  dsl Save length of key instead of relying of the weight of the record sep.
This frees a byte value to use for 'end of key' (to correctly sort
short keys) while still having a weight assigned to the field sep.
(Unless -t is given, the field sep is in the field data.)
Do reverse sorts by writing the output file in reverse order (rather
than reversing the sort - apart from merges).
All key compares are now unweighted.
For 'sort -u' mark duplicates keys during the sort and don't write
to the output.
Use -S to mean a posix sort - where equal keys are sorted using the
raw record (rather than being kept in the original order).
For 'sort -f' (no keys) generate a key of the folded data (as for -n
-i and -d), simplifies the code and allows a 'posix' sort.
 1.54  05-Sep-2009  dsl Include a local copy of the sradixsort() code from libc.
Currently unchanged apart from the deletion of the 'unstable' version and
other unneeded code.
Use fldtab[0]. not fldtab-> when we are referring to the global info
in the 0th entry to emphasise that this entry is different.
fldtab[0].weights is only needed in the SINGL_FLD case - so set it there.
Re-indent a big 'if' is setfield() so that the line breaks match the
logic - which looks dubious now!
 1.53  22-Aug-2009  dsl Put radixsort() and sradixsort() the correct way around.
 1.52  22-Aug-2009  dsl Rework the way sort generates sort keys:
- If we generate a key, it is always sortable using memcmp()
- If we are sorting the whole record, then a weight-table must be used
during compares.
- Major surgery to encoding of numbers to ensure unique keys for equal
numeric values. Reverse numerics are handled by inverting the sign.
- Case folding (-f) is handled when the sort keys are generated. No other
code has to care at all.
- Key uniqueness (-u) is done during merge for large datasets. It only
has to be done when writing the output file for small files.
Since the file is in key order this is simple!
Probably fixes all of: PR/27257 PR/25551 PR/22182 PR/31095 PR/30504
PR/36816 PR/37860 PR/39308
Also PR/18614 should no longer die, but a little more work needs to be
done on the merging for very large files.
 1.51  20-Aug-2009  dsl Delete more unwanted/unused cruft.
Simplify logic for reading input records.
Do a merge sort whenever we have 16 partial sorted blocks.
The patient is breathing, but still carrying a lot of extra weight.
 1.50  18-Aug-2009  dsl The code that attempted to sort large files by sorting each chunk by the
first key byte and writing to a temp file, then sorting the records from
each temp file that had the same first key byte (and repeating for upto
4 key bytes) was a nice idea, but completely doomed to failure.
Eg PR/9308 where a 70MB file has all but one record the same and short keys.
Not only does the code not work, it is rather guaranteed to be slow.
Instead always use a merge sort for fully sorted chunk of records (each
temporary file contains one lot of sorted records).
The -H option already did this, so just rip out all the code and variables
that can't be used when -H was specified.
Further cleanup to come ...
 1.49  15-Aug-2009  dsl Ansify.
I'm looking at fixing the 'sort -n' fubars, but this code is an
inpeneterable mess - which needs some fixing first!
 1.48  13-Apr-2009  lukem Fix WARNS=4 issues (-Wcast-qual -Wsign-compare)
 1.47  08-Nov-2008  christos branches: 1.47.2;
Make -R accept numeric arguments so one can say -R '\0' to be used in
pipelines like find . -print0 | sort -R '\0'. From Anon Ymous
 1.46  21-Jul-2008  lukem branches: 1.46.4; 1.46.8;
Remove the \n and tabs from the __COPYRIGHT() strings.
Tweak to use a consistent format.
 1.45  28-Apr-2008  martin branches: 1.45.2;
Remove clause 3 and 4 from TNF licenses
 1.44  23-Oct-2006  jdolecek branches: 1.44.16;
when using -o into file which already exists, copy the permissions
of the original file to the new (sorted) file

adresses PR bin/26860 by Michael van Elst
 1.43  23-Oct-2006  jdolecek replace access(2) + /dev/ prefix check with lstat(2) and S_ISCHR()/S_ISBLK()

part of PR bin/26860 by Michael van Elst

while here, put output file fopen() inside the code block of the
only code path where it's actually needed, to make the logic more obvious;
and in the "stdout" case, initialize toutpath to empty string rather
then /dev/stdout, to make it clear /dev/stdout is not actually used
 1.42  23-Oct-2006  jdolecek use F_OK instead of 0 for second parameter of access(2)

part of PR bin/26860 by Michael van Elst
 1.41  23-Jul-2004  wiz Sync usage with man page. From Kouichirou Hiratsuka in PR 26278.
 1.40  14-Mar-2004  heas remove double initialisation of SINGL_FLD & SEP_FLAG
 1.39  17-Feb-2004  jdolecek ftpos pointer was not updated when fldtab was reallocated; drop completely
in favour of an index counter
fixes bin/24449 by Jun-ichiro itojun
 1.38  17-Feb-2004  jdolecek fldtab[] needs to have one extra element - this marks end of array
adresses part of PR bin/24449 by Jun-ichiro itojun
 1.37  17-Feb-2004  itojun use safer realloc idiom
memset new region got by realloc
 1.36  17-Feb-2004  itojun initialize fldtab
 1.35  15-Feb-2004  jdolecek remove compile-time limit on number of -k options, allocate necessary
structures as-needed
 1.34  07-Aug-2003  jdolecek add TNF copyright
 1.33  07-Aug-2003  agc Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22365, verified by myself.
 1.32  24-Dec-2002  jdolecek g/c many_files(), too
 1.31  24-Dec-2002  jdolecek bump 'soft' limit for number of files to hard limit on startup; we
want to be able to open as many temporary files as possible
 1.30  24-Dec-2002  jdolecek move fltab outside main and make it static, eliminate two memset()s
g/c superfluous extern definition for clist[] and ncols
make toutpath[] static
 1.29  27-Nov-2002  tron Remove the statically initialized "sigaction" structure completely because
such usage is broken. Problem pointed out by Klaus Klein on
"sources-changes@netbsd.org".
 1.28  27-Nov-2002  tron Add braces in a statically initialized "sigaction" structure to fix a
build problem after siginfo(2) has been added.
 1.27  14-May-2001  jdolecek disable the code which maxes nofiles limit, it should not be normally
needed now
 1.26  30-Apr-2001  ross XXX
For some reason this program wants to open _hundreds_ of temporary files.
Make it setrlimit(RLIMIT_NOFILE, ...), so this rather dubious strategy at
least works well enough to ctag(1) our own kernel.
XXX
 1.25  22-Feb-2001  christos - use MAXPATHLEN (1024) instead of _POSIX_PATH_MAX (255) for the temporary
path buffer
- provide better error messages about why the temp file creation is failing
- explicitly compare syscall return to -1 instead of < 0 and fdopen return
to NULL instead of 0.
 1.24  21-Feb-2001  christos Fix problem when using sort >> foo
If no output file was specified sort fopened("/dev/stdout", "w").
This is *wrong* because "/dev/stdout" will truncate the output file,
thus undoing the append effect the shell had set up. The simple fix
here is to just arrange for outfp = stdout and don't play with /dev/stdout.

While I am here:
- KNF
- make pattern for mkstemp have 6 X's.
 1.23  19-Feb-2001  jdolecek full -T support
 1.22  19-Feb-2001  jdolecek resurrect old ftmp() - it supports alternative directory for temporary
file, which is needed for -T support
 1.21  07-Feb-2001  jdolecek use -R instead of -w, since that's what OpenBSD is using and there is no reason
to be different
 1.20  07-Feb-2001  jdolecek Since -T is used to select directory for temporary files in other sort
implementations, we should avoid using it for something else.
Use (new) flag -w for setting record delimiter, make -T noop.
 1.19  07-Feb-2001  jdolecek use errx(), not err() within section for '-t' flag
 1.18  13-Jan-2001  soren And make usage() test for NULL explicitly..
 1.17  13-Jan-2001  soren usage() expects a NULL when there is no specific error message.
 1.16  13-Jan-2001  jdolecek save couple of cycles and bytes by static initialization of sigaction act
and sigtable[]
 1.15  12-Jan-2001  jdolecek alltable[], itable[], dtable[] were moved to init.c, g/c from sort.[ch]
put extern declaration for gweights[] to sort.h
add -s/-S to usage(), couple of formating nits
 1.14  11-Jan-2001  jdolecek the g/c in rev 1.12 was too aggressive - put back code
to change file '-' to '/dev/stdin'
 1.13  11-Jan-2001  jdolecek general cleanup of file list passing:
* get rid of union f_handle, replace by passing explicit int parameter
and (new) struct filelist
* add new typedefs gen_func_t and put_func_t and use where appropriate
 1.12  08-Jan-2001  jdolecek make ftmp() wrapper aroung tmpfile(), there is no need to reimplement it
move ftmp() from tmp.c to files.c
g/c no longer needed stuff
 1.11  08-Jan-2001  jdolecek call setlocale() on startup
reformat the switch contents in main() a little, sort flags by alphabet
where possible
 1.10  08-Jan-2001  jdolecek constify a bit, small cleanups
 1.9  08-Jan-2001  jdolecek by default, use stable sort
add -S flag to switch to non-stable sort; for GNU sort compatibility,
provide -s flag too
 1.8  16-Oct-2000  jdolecek include a bit more information in error messages, constify
put temporary files in _PATH_TMP by default
 1.7  11-Oct-2000  thorpej Format string fixes.
 1.6  07-Oct-2000  bjh21 OpenBSD revision 1.5:
Normalize treatment of -n option. Don't know why it was ever special-cased
(since it was broken that way).
 1.5  07-Oct-2000  bjh21 OpenBSD revision 1.3:
for implied stdin, do not corrupt argv[0]
 1.4  07-Oct-2000  bjh21 Part of OpenBSD revision 1.2:
Fix err(3) usage.
 1.3  07-Oct-2000  bjh21 Two classes of changes from the initial OpenBSD commit of this sort(1):
FILE * variables are called "fp" rather than "fd".
Better (safer) temporary-file handling.
 1.2  07-Oct-2000  bjh21 Hit sort(1) with a hammer till it compiles.
Also add RCSIDs.
 1.1  07-Oct-2000  bjh21 branches: 1.1.1;
Initial revision
 1.1.1.1  07-Oct-2000  bjh21 4.4BSD-Lite2 contrib/sort
 1.44.16.1  18-May-2008  yamt sync with head.
 1.45.2.1  18-Sep-2008  wrstuden Sync with wrstuden-revivesa-base-2.
 1.46.8.2  20-May-2011  matt bring matt-nb5-mips64 up to date with netbsd-5-1-RELEASE (except compat).
 1.46.8.1  21-Apr-2010  matt sync to netbsd-5
 1.46.4.2  29-Jun-2010  riz Pull up following revision(s) (requested by dholland in ticket #1420):
usr.bin/sort/sort.h: revision 1.31
usr.bin/sort/sort.c: revision 1.58
usr.bin/sort/fsort.c: revision 1.47
usr.bin/sort/msort.c: revision 1.30
Don't touch past the end of allocated region. It results segmentation
violation.
 1.46.4.1  14-Oct-2009  sborrill Pull up the following revisions(s) (requested by dsl in ticket #1084):
usr.bin/sort/Makefile: revision 1.6-1.8
usr.bin/sort/append.c: revision 1.15-1.22
usr.bin/sort/fields.c: revision 1.20-1.30
usr.bin/sort/files.c: revision 1.27-1.40
usr.bin/sort/fsort.c: revision 1.33-1.45
usr.bin/sort/fsort.h: revision 1.14-1.17
usr.bin/sort/init.c: revision 1.19-1.23
usr.bin/sort/msort.c: revision 1.19-1.28
usr.bin/sort/radix_sort.c: revision 1.1-1.4
usr.bin/sort/sort.1: revision 1.27-1.29
usr.bin/sort/sort.c: revision 1.47-1.56
usr.bin/sort/sort.h: revision 1.20-1.30
usr.bin/sort/tmp.c: revision 1.14-1.15

Only use radix sort for in-memory sort, always merge temporary files.
Use a local radixsort() function so we can pass record length.
Avoid use of weight tables for key compares.
Fix generation of keys for numbers, negate value for reverse sort.
Write file in reverse-key order for 'sort -n'.
'sort -S' now does a posix sort (sort matching keys by record data).
Ensure merge sort doesn't have too many temporary files open.
Fixes: PR#18614 PR#27257 PR#25551 PR#22182 PR#31095 PR#30504 PR#36816
PR#37860 PR#39308 PR#42094
 1.47.2.1  13-May-2009  jym Sync with HEAD.

Third (and last) commit. See http://mail-index.netbsd.org/source-changes/2009/05/13/msg221222.html
 1.63.2.1  20-Mar-2017  pgoyette Sync with HEAD

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