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Message-ID: <20050911094314.GA15155@londo.c47.org>
and remove the check_byacc target from the x2p makefile
p4raw-id: //depot/perl@25534
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(Lots of Perl 5 source code archaeology was involved.)
Larry didn't make strangled noises when I showed him
the patch, either :-)
p4raw-id: //depot/perl@19242
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p4raw-id: //depot/perl@18807
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p4raw-id: //depot/perl@18801
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p4raw-id: //depot/perl@14391
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p4raw-id: //depot/perl@8289
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p4raw-id: //depot/perl@3518
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Message-Id: <tqd879vf4z.fsf@puma.genscan.com>
p4raw-id: //depot/perl@2161
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CORE LANGUAGE CHANGES
Subject: Strictly follow lexical context of C<eval ''> and nested subs
From: Chip Salzenberg <chip@perl.com>
Files: op.c
Subject: Make ::SUPER and UNIVERSAL work together
From: Chip Salzenberg <chip@perl.com>
Files: gv.c pod/perlguts.pod
CORE PORTABILITY
Subject: OS/2 patches
Date: Wed, 5 Mar 1997 22:08:43 -0500 (EST)
From: Ilya Zakharevich <ilya@math.ohio-state.edu>
Files: hints/os2.sh lib/ExtUtils/MakeMaker.pm t/op/taint.t
Msg-ID: 199703060308.WAA22211@monk.mps.ohio-state.edu
(applied based on p5p patch as commit eda4d5189d403b15f244b4696a710fb91d15053e)
Subject: VMS patches
Date: Wed, 05 Mar 1997 23:10:24 -0500 (EST)
From: Charles Bailey <bailey@HMIVAX.HUMGEN.UPENN.EDU>
Files: lib/ExtUtils/MM_VMS.pm lib/ExtUtils/Manifest.pm perlsdio.h t/op/runlevel.t t/op/taint.t vms/descrip.mms vms/perly_c.vms vms/sockadapt.c vms/sockadapt.h vms/vms_yfix.pl
private-msgid: 01IG5SQE4A6U00661G@hmivax.humgen.upenn.edu
DOCUMENTATION
Subject: Add taint checks and srand to perldelta
Date: Sun, 2 Mar 1997 11:56:08 -0800 (PST)
From: Tom Phoenix <rootbeer@teleport.com>
Files: pod/perldelta.pod
Msg-ID: Pine.GSO.3.95q.970302115355.23058D-100000@kelly.teleport.com
(applied based on p5p patch as commit b28e0bc0aa3232e18d1bacb3efcbfb755ad100e0)
Subject: Don't call FileHandle 'deprecated'
From: Chip Salzenberg <chip@perl.com>
Files: pod/perldelta.pod
Subject: Improve sample module header
Date: Sat, 01 Mar 1997 10:32:31 -0700
From: Tom Christiansen <tchrist@jhereg.perl.com>
Files: pod/perlmod.pod
Msg-ID: 199703011732.KAA14693@jhereg.perl.com
(applied based on p5p patch as commit 3e1e15658152387f41e00ded4796cede4e1e10d3)
Subject: Update list of CPAN sites
Date: Sun, 2 Mar 1997 16:54:22 +0200 (EET)
From: Jarkko Hietaniemi <jhi@iki.fi>
Files: pod/perlmod.pod
Msg-ID: 199703021454.QAA07446@alpha.hut.fi
(applied based on p5p patch as commit 9423903e60e6c92c1893f5f4cab2476f403f8a4b)
Subject: Enhance description of 'server error'
Date: Tue, 4 Feb 1997 21:03:23 +0200 (EET)
From: Jarkko Hietaniemi <jhi@cc.hut.fi>
Files: pod/perldiag.pod
private-msgid: 199702041903.VAA16070@alpha.hut.fi
Subject: Regularize format of E-Mail addresses in *.pod
From: Chip Salzenberg <chip@perl.com>
Files: pod/*.pod
LIBRARY AND EXTENSIONS
Subject: Use IV instead of double for tms structure members
From: Chip Salzenberg <chip@perl.com>
Files: ext/POSIX/POSIX.xs
OTHER CORE CHANGES
Subject: Make sure $^X is tainted when ARG_ZERO_IS_SCRIPT
From: Chip Salzenberg <chip@perl.com>
Files: toke.c
Subject: Clarify '-T too late' error
From: Chip Salzenberg <chip@perl.com>
Files: perl.c pod/perldiag.pod
Subject: Warn when redefining or undefining a constant sub
From: Chip Salzenberg <chip@perl.com>
Files: pod/perldiag.pod pp.c sv.c
Subject: Don't generate spurious 'not imported' warning
From: Chip Salzenberg <chip@perl.com>
Files: gv.c t/pragma/strict-vars pod/perldiag.pod
Subject: Clarify message re: @host in string
From: Chip Salzenberg <chip@perl.com>
Files: pod/perldiag.pod pod/perltrap.pod toke.c
Subject: Disconnect refs that are targets of pp_readline
From: Chip Salzenberg <chip@perl.com>
Files: pp_hot.c
Subject: Fix typo in test of HvFILL()
From: Chip Salzenberg <chip@perl.com>
Files: op.c
Subject: Allow for pad name array to be shorter than pad array
From: Chip Salzenberg <chip@perl.com>
Files: op.c
Subject: Eliminate format-string type warnings
Date: Mon, 3 Mar 1997 10:15:11 +0100 (MET)
From: Hallvard B Furuseth <h.b.furuseth@usit.uio.no>
Files: doio.c ext/POSIX/POSIX.xs gv.c hints/dec_osf.sh pp.c pp_ctl.c pp_hot.c run.c sv.c x2p/a2py.c
private-msgid: 199703030915.KAA11634@bombur2.uio.no
Subject: Update copyright dates
From: Chip Salzenberg <chip@perl.com>
Files: *.[hc] x2p/*.[hc] win32/EXTERN.h vms/vmsish.h vms/vms.c
TESTS
Subject: Smarter t/op/taint.t
Date: Mon, 3 Mar 1997 10:31:54 -0800 (PST)
From: Tom Phoenix <rootbeer@teleport.com>
Files: t/op/taint.t
private-msgid: Pine.GSO.3.95q.970303103047.24000A-100000@kelly.teleport.com
Subject: Fix taint test for systems without csh
From: Chip Salzenberg <chip@perl.com>
Files: t/op/taint.t
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BUILD PROCESS
Subject: Fix eval "" in Configure
Date: Fri, 14 Feb 1997 13:09:53 -0500
From: John L. Allen <allen@gateway.grumman.com>
Files: Configure
Subject: Re: Configure problem on IRIX - me dumb
p5p-msgid: <9702141809.AA17001@gateway.grumman.com>
Subject: Don't link with -lsfio if sfio is not requested
From: Chip Salzenberg <chip@perl.com>
Files: Configure
Subject: perl5.003_26 Configure change "win" for AIX 4
Date: Fri, 14 Feb 1997 13:59:02 -0600 (CST)
From: Tim Mooney <mooney@dogbert.cc.ndsu.NoDak.edu>
Files: Configure
p5p-msgid: <Pine.OSF.3.95.970214135751.32654A-100000@dogbert.cc.ndsu.NoDak.edu>
private-msgid: <Pine.OSF.3.95.970214135751.32654A-100000@dogbert.cc.ndsu.NoD
CORE LANGUAGE CHANGES
Subject: Better looks_like_number() function [sv.c]
Date: Fri, 14 Feb 1997 18:08:52 +0100
From: Gisle Aas <aas@bergen.sn.no>
Files: sv.c
Msg-ID: <199702141708.SAA17546@bergen.sn.no>
(applied based on p5p patch as commit 8dbaa58ee2aba7cc22d84199a674c58bbf108b46)
Subject: Remove redundant functions UNIVERSAL::{class,is_instance}
Date: 14 Feb 1997 15:52:21 +0000
From: Gisle Aas <aas@bergen.sn.no>
Files: pod/perldelta.pod pod/perlobj.pod t/op/universal.t universal.c
Msg-ID: <hwwsbpeq2.fsf@bergen.sn.no>
(applied based on p5p patch as commit 77bb9b23081b62119e8fbe9f5655b8802e4537ae)
Subject: Allow C<setpgrp $$>
Date: 16 Feb 1997 23:19:12 -0500
From: Roderick Schertler <roderick@gate.net>
Files: pp_sys.c
Msg-ID: <pzraigyshr.fsf@eeyore.ibcinc.com>
(applied based on p5p patch as commit 3d2573a84a1aa655d5da58c57b3fc20e04d40f9f)
Subject: Fix syntax error on C<&$1>
From: Chip Salzenberg <chip@perl.com>
Files: toke.c
Subject: Fix grep() with refs in array context
From: Chip Salzenberg <chip@perl.com>
Files: pp.c
CORE PORTABILITY
Subject: Eliminate $^S; add C<use vmsish qw(status exit time)>
Date: Mon, 17 Feb 1997 02:45:26 -0500 (EST)
From: Charles Bailey <bailey@HMIVAX.HUMGEN.UPENN.EDU>
Files: MANIFEST gv.c lib/English.pm lib/ExtUtils/MM_VMS.pm lib/ExtUtils/Mksymlists.pm lib/ExtUtils/xsubpp mg.c op.c perl.c perl.h pod/perldelta.pod pod/perlmod.pod pod/perlvar.pod pp_ctl.c pp_sys.c utils/perldoc.PL vms/Makefile vms/config.vms vms/descrip.mms vms/ext/Stdio/Stdio.pm vms/ext/Stdio/Stdio.xs vms/ext/XSSymSet.pm vms/ext/vmsish.pm vms/vms.c vms/vmsish.h win32/makedef.pl
private-msgid: <01IFI9CFKL0S004R2V@hmivax.humgen.upenn.edu>
LIBRARY AND EXTENSIONS
Subject: Remove Fatal.pm
From: Chip Salzenberg <chip@perl.com>
Files: MANIFEST lib/Fatal.pm pod/perldelta.pod pod/perlmod.pod pod/roffitall t/lib/fatal.t
Subject: Refresh MakeMaker to 5.40
From: Andy Dougherty <doughera@lafcol.lafayette.edu>
Files: lib/ExtUtils/Liblist.pm lib/ExtUtils/MM_Unix.pm lib/ExtUtils/MakeMaker.pm lib/ExtUtils/Mksymlists.pm
OTHER CORE CHANGES
Subject: Fix core dump when embedding
From: Chip Salzenberg <chip@perl.com>
Files: perl.c
Subject: Re: Fragile signals
Date: Thu, 13 Feb 1997 01:44:39 -0500 (EST)
From: Ilya Zakharevich <ilya@math.ohio-state.edu>
Files: mg.c
Msg-ID: <199702130644.BAA07572@monk.mps.ohio-state.edu>
(applied based on p5p patch as commit 09df8c7df7dfc9853902f1fdd8a6d95f53be66fc)
Subject: Make format strings correspond exactly to parameters
Date: 13 Feb 1997 17:24:31 -0500
From: Roderick Schertler <roderick@gate.net>
Files: doio.c ext/DB_File/DB_File.xs ext/Opcode/Opcode.xs gv.c op.c perl.c pp_ctl.c pp_sys.c regcomp.c toke.c
Msg-ID: <pz7mkc1h0g.fsf@eeyore.ibcinc.com>
(applied based on p5p patch as commit bf81aadd817bdea29720b072eef945df2da8463b)
Subject: Don't try to attach 'o' magic to read-only values
From: Chip Salzenberg <chip@perl.com>
Files: sv.c
Subject: Fix carriage-return message
From: Chip Salzenberg <chip@perl.com>
Files: toke.c
Subject: In <=>, test for equality first
From: Chip Salzenberg <chip@perl.com>
Files: pp.c
Subject: Don't mark sv_{true,false} PADTMP
From: Chip Salzenberg <chip@perl.com>
Files: op.c
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[editor's note: this commit combines approximate 4 months of furious
releases of Andy Dougherty and Larry Wall - see pod/perlhist.pod for
details. Andy notes that;
Alas neither my "Irwin AccuTrack" nor my DC 600A quarter-inch cartridge
backup tapes from that era seem to be readable anymore. I guess 13 years
exceeds the shelf life for that backup technology :-(.
]
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[the last one taken from the September '94 InfoMagic CD; a similar
style of cleanup as the previous commits was performed]
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[editor's note: the sparc executables have not been included, and
emacs backup files have been removed. This was reconstructed from a
tarball found on the September 1994 InfoMagic CD; the date of this is
approximate]
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[editor's note: from history.perl.org. The sparc executables
originally included in the distribution are not in this commit.]
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See patch #20.
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See patch #4.
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So far, 4.0 is still a beta test version. For the last production
version, look in pub/perl.3.0/kits@44.
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Most of these patches are pretty self-explanatory. Much of this
is random cleanup in preparation for version 4.0, so I won't talk
about it here. A couple of things should be noted, however.
First, there's a new -0 option that allows you to specify (in octal)
the initial value of $/, the record separator. It's primarily
intended for use with versions of find that support -print0 to
delimit filenames with nulls, but it's more general than that:
null
^A
default
CR
paragraph mode
file slurp mode
This feature is so new that it didn't even make it into the book.
The other major item is that different patchlevels of perl can
now coexist in your bin directory. The names "perl" and "taintperl"
are just links to "perl3.044" and "tperl3.044". This has several
benefits. The perl3.044 invokes the corresponding tperl3.044 rather
than taintperl, so it always runs the correct version. Second, you can
"freeze" a script by putting a #! line referring to a version that
it is known to work with. Third, you can put a new version out
there to try out before making it the default perl. Lastly, it
sells more disk drives. :-)
Barring catastrophe, this will likely be the last patch before
version 4.0 comes out.
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See patch #19.
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Well, I didn't quite fix 100 things--only 94. There are still
some other things to do, so don't think if I didn't fix your
favorite bug that your bug report is in the bit bucket. (It
may be, but don't think it. :-)
There are very few enhancements here. One is the new pipe()
function. There was just no way to emulate this using the
current operations, unless you happened to have socketpair()
on your system. Not even syscall() was useful in this respect.
Configure now determines whether volatile is supported, since
some compilers implement volatile but don't define __STDC__.
Some compilers can put structure members and global variables
into registers, so more variables had to be declared volatile
to avoid clobbering during longjmp().
Some systems have wanted routines stashed away in libBSD.a and
libPW.a. Configure can now find them.
A number of Configure tests create a file called "try" and then
execute it. Unfortunately, if there was a "try" elsewhere in PATH
it got that one instead. All references are now to "./try".
On Ultrix machines running the Mips cpu, some header files define
things differently for assembly language than for the C language.
To differentiate these, cc passes a -DLANGUAGE_C to the C preprocessor.
Unfortunately, Configure, makedepend and perl want to use the
preprocessor independently of cc. Configure now defaults to
adding -DLANGUAGE_C on machines containing that symbol in signal.h.
In Configure, some libraries were getting into the list more than
once, causing extra extraction overhead. The names are now
uniquified.
Someone has invented yet another output format for nm. Sigh.
Why do people assume that only people read the output of programs?
Due to commentary between a declaration and its semicolon, some
standard versions of stdio weren't being considered standard, and the
type of char used by stdio was being misidentified.
People trying to use bison instead of yacc ran into two problems.
One, lack of alloca(), is solved on some machines by finding libPW.a.
The other is that you have to supply a -y switch to bison to get
it to emulate yacc naming conventions. Configure now prompts
correctly for bison -y.
The make clean had a rm -f $suidperl where it just wanted
a rm -f suidperl
In the README, documented more weirdities on various machines,
including a pointer to the JMPCLOBBER symbol.
In the construct
OUTER: foreach (1,2,3) {
INNER: foreach (4,5) {
...
next OUTER;
}
}
the inner loop was not getting reset to the first element. This
was one of those bugs that arise because longjmp() doesn't
execute exit handlers as it unwinds the stack.
Perl reallocs many things as they grow, including the stack (its
stack, not the C program's stack). This means that routines
have to be careful to retreive the new stack when they call
subroutines that can do such a realloc. In cmd.c there was
such code but it was hidden inside an #ifdef JMPCLOBBER that
it should have been outside of, so you could get bad return
values of JMPCLOBBER wasn't defined. If you defined JMPCLOBBER
to work around this problem, you should consider undefining
it if your compiler guarantees that register variables get the value
they had either at setjmp() or longjmp() time. Perl runs
slightly faster without JMPCLOBBER defined.
The longjmp()s that perl does return known values, but as a
paranoid programming measure, it now checks that the values
are one of the expected ones.
If you say something like
while (s/ /_/) {}
the substitution almost always succeeds (on normal text). There
is an optimization that quickly discovers and bypasses operations
that are going to fail, but does nothing to help generally successful
ones such as the one above. So there's a heuristic that disables
the optimization if it isn't buying us anything. Unfortunately,
in the above case, it's in the conditional of a while loop,
which is duplicated by another optimization to be a
last unless s/ /_/;
at the end of the loop, to avoid unnecessary subroutine calls.
Because the conditional was duplicated (not the expression itself,
just the structure pointing to it), the heuristic mentioned above
tried to disable the first optimization twice, resulting in the
label stack getting corrupted.
Some subroutines which mix both return mechanisms like this:
sub foo {
local($foo);
return $foo if $whatever;
$foo;
}
This clobbered the return value of $foo when the end of the scope
of the local($foo) was reached. This was because such a routine
turns into something like this internally:
sub foo {
_SUB_: {
local($foo);
if ($whatever) {
$foo; last _SUB_;
}
$foo;
}
}
Because the outer _SUB_ block was manufactured by non-standard
means, it wasn't getting marked as an expression that could
return a value, ie a terminal expression. So the return value
wasn't getting properly saved off to the side before the local()
exited.
The internal label on subroutine blocks used to be SUB, but I
changed it to _SUB_ to avoid possible confusion. Evals now have
labels too, so they are labelled with _EVAL_. The reason evals
now have a label is that nested evals need separate longjmp
environments, or fatal errors end up getting a longjmp() botch.
So eval now uses the same label stack as loops and subroutines.
The eval routine used to always return undef on failure. In an
array context, however, this makes a non-null array, which when
assigned is TRUE, which is counter-intuitive. It now returns
a null array upon failure in an array context.
When a foreach operator works on a non-array, the compiler translates
foreach (1,2,3) {
into something like
@_GEN_0 = (1,2,3); foreach (@_GEN_0) {
Unfortunately, the line number was not correctly propagated to both
command structures, so huge line numbers could appear in error
messages and while debugging.
The x operator was stupidly written, just calling the internal
routine str_scat() multiple times, and not preextending the
string to the known new length. It now preextends the string
and calls a special routine to replicate the string quickly.
On long strings like '\0' x 1024, the operator is more than
10 times faster.
The split operator is supposed to split into @_ if called in
a scalar context. Unfortunately, it was also splitting into @_
in an array context that wasn't a real array, such as assignment
to a list:
($foo,$bar) = split;
This has now been fixed.
The split and substitute operators have a check to make sure
that it isn't looping endlessly. Unfortunate, they had a hardwired
limit of 10000 iterations. There are applications conceivable
where you could work on longer values than that, so they
now calculate a reasonable limit based on the length of the arguments.
Pack and unpack called atoi all the time on the template fields.
Since there are usually at most one or two digits of number,
this wasted a lot of time on machines with slow subroutine calls.
It now picks up the number itself.
There were several places that casts could blow up. In particular,
it appears that a sun3 can't cast a negative float to an unsigned
integer. Appropriate measure have been taken--hopefully this
won't blow someone else up.
A local($.) didn't work right because the actual value of the
current line number is derived from the last input filehandle.
This has been fixed by causing the last input filehandle to
be restored after the scope of a local($.) to what it was when
the local was executed.
Assignment is supposed to return the final value of the left
hand side. In the case of array assignment (in an array context),
it was actually returning the right hand side. This showed up in
things that referred to the actual elements of an array value,
such as grep(s/foo/bar/, @abc = @xyz), which modified @xyz rather
than @abc.
The syscall() function was returning a garbage value (the index of
the top of the stack, actually) rather than value of system call.
There was some discussion about how to open files with arbitrary
characters in the filename. In particular, the open function strips
trailing spaces. There was no way to suppress this. Now you can
put an explicit null at the end of the string
open(FOO,"$filename\0")
and this will hide any spaces on the end of the filename. The Unix
open() function will of course treat the null as the trailing delimiter.
As a hangover from when Perl was not useful on binary files, there
was a check to make sure that the file being opened was a normal
file or character special file or socket. Now that Perl can
handle binary data, this is useless, and has been removed.
Some versions of utime.h have microseconds specified as acusec and
modusec. Perl was referring to these in order to zero out the
fields. But not everyone has these. Perl now just bzero's out
the structure and refers only to fields that everyone has.
You used to have to say
($foo) = unpack("L",$bar);
Now you can say
$foo = unpack("L",$bar);
and it will just unpack the first thing specified by the template;
The subscripts for slices were ignoring the value of $[. (This
never made any difference for people who leave $[ set to 0.)
It seems reasonable that grep in a scalar context should return the
number of items matched so that it can be used in, say, a conditional.
Formerly it returned an undef.
Another problem with grep was that if you said something like
grep(/$1/, @foo)
then each iteration of grep was executing in the context of the
previous iteration's regexp, so $1 might be wiped out after the
first iteration. All iterations of grep now operate in the regexp
context of the grep operator itself.
The eg/README file now explicity states that the examples in
the eg directory are to be considered in the Public Domain, and
thus do not have the same restrictions as the Perl source.
In a previous patch the shift operator was made to shift @_ inside
of subroutines. This made some of the getopt code wrong.
The sample rename command (and the new relink command) can either
take a list of filenames from stdin, or if stdin is a terminal,
default to a * in the current directory.
A sample travesty program is now included. If you want to know what
it does, feed it about 10 Usenet articles, or the perl manual, and
see what it prints out.
If a return operator was embedded in an expression that supplied
a scalar context, but the subroutine containing the return was
called in an array context, an array was not returned correctly.
Now it is.
The !~ operator used to ignore the negation in an array context and
do the same thing as =~. It now always returns scalar even in
array context, so if you say
($foo) = ($bar !~ /(pat)/)
$foo will get a value of either 1 or ''.
Opens on pipes were defined to return the child's pid in the parent,
and FALSE in the child. Unfortunately, what the child actually
got was an undef, making it indistinguishable from a failure to
open the pipe successfully. The child now gets a 0, and undef
means a failure to fork a child.
Formerly, @array in a scalar context returned the last value of
the array, by analogy to the comma operator. This makes for
counter-intuitive results when you say
if (@array)
if 0 or '' is a legal array value. @array now returns the length
of the array (not the subscript of the last element, which is @#array).
To get the last element of the array you must either pop(@array) or
refer to $array[$#array].
The chdir operator with no argument was supposed to change directory
to your home directory, but it core dumped instead.
The wait operator was ignoring SIGINT and SIGQUIT, by analogy to
the system and pipe operations. But wait is a lower level operation,
and it gives you more freedom if those signals aren't automatically
ignored. If you want them ignored, you now have to explicitly
ignore them by setting the proper %SIG entry.
Different versions of /bin/mkdir and /bin/rmdir return different
messages upon failure. Perl now knows about more of them.
-l FILEHANDLE now disallowed
The use of the -l file test makes no sense on a filehandle, since
you can't open symbolic links. So -l FILEHANDLE now is a fatal
error. This also means you can't say -l _, which is also a
useless operation.
The heavy wizardry involved in saying $#foo -= 2 didn't work quite
right.
In formats, you can say ... in a ^ field to have ... output when
there is more for that field that is getting truncated. The
next field was getting shifted over by three characters, however.
The perl library routines abbrev.pl, complete.pl, getopt.pl and
getopts.pl were assuming $[ == 0. The Getopt routine wasn't
returning an error on unrecognized switches. The look.pl routine
had never been tested, and didn't work at all. Now it does.
There were several difficulties in termcap.pl. Togoto was documented
backwards for $rows and $cols. The Tgetent routine could loop
endlessly if there was a tc entry. And it didn't interpret the ^x
form of specifying control characters right because of base
treachery (031 instead of 31). There were also problems with
using @_ as a temporary array.
In perl.h, the unused VREG symbol was deleted because it conflicted
with somebody's header files.
If perl detects a #! line that specifies some other interpreter
than perl, it will now start up that interpreter for you. This
let's you specify a SHELL of perl to some programs.
The $/ variable specifies the input record separator. It was
possible to set it to a non-text character and read in an entire
text file as one input, but it wasn't possible to do that
for a binary file. Now you can undef $/, and there will be
no record separator, so you are guaranteed to get the entire
file with one <>.
The example in the manual of an open() inside a ?: had the
branches of the ?: backwards. I documented the fact that
grep can modify arrays in place (with caveats about modifying
literal values). I also put in how to deal with filenames
that might have arbitrary characters, and mentioned about the
problem of unflushed buffers on opens that cause forks.
It's now documented how to force top of page before the next write.
Formerly, $0 was guaranteed to contain the name of the perl script
only till the first regular expression was executed. It now
keeps that value permanently. $0 can no longer be used as a synonym
for $&.
The regular expression evaluator didn't handle character classes
with the 8th bit set. None of /[\200-\377]/, \d, \w or \s worked
right--the character class because signed characters were not
interpreted right, and the builtins because the isdigit(), isalpha()
and isspace() macros are only defined if isascii() is true.
Patterns of the form /\bfoo/i didn't work right because the \b
wants to compare the preceding character with the next one
to look for word boundaries, and the i modifier forced a move
of the string to a place where it couldn't do that without
examining malloc garbage.
The type glob syntax *foo produces the symbol table entry for
all the various foo variables. Perl has to do certain bookkeeping
when moving such values around. The symbol table entry was not
adequately differentiated from normal data to prevent occasion
confusion, however.
On MICROPORTs, the CRIPPLED_CC option made the stab_array()
and stab_hash() macros into function calls, but neglected to
supply the function definitions.
The string length allocated to turn a number into a string
internally turned out to be too short on a Sun 4.
Several constructs were not recognized properly inside double-quoted
strings:
underline in name
required @foo to be defined rather than %foo
threw off bracket matcher
not identified with $1
The base.term test gives misleading results if /dev/null happens
not to be a character special file. So it now checks for that.
The op.stat could exceed the shell's maximum argument length
when evaluating </usr/bin/*>. It now chdirs to /usr/bin and does <*>.
return grandfathered to never be function call
The construct
return (1,2,3);
did not do what was expected, since return was swallowing the
parens in order to consider itself a function. The solution,
since return never wants any trailing expression such as
return (1,2,3) + 2;
is to simply make return an exception to the paren-makes-a-function
rule, and treat it the way it always was, so that it doesn't
strip the parens.
If perldb.pl doesn't exist, there was no reasonable error message
given when you invoke perl -d. It now does a do-or-die internally.
null hereis core dumped
The hereis construct dumped core on a null string:
print <<'FOO';
FOO
Certain pattern matches weren't working on patterns with embedded
nulls because the fbminstr() routine, when it decided it couldn't
do a fancy search, degenerated to using instr(), rather than
ninstr(), which is better about embedded nulls.
The s2p sed-to-perl translator didn't translate \< and \> to \b.
Now it does.
The a2p awk-to-perl translator didn't put a $ on ExitValue when
translating the awk exit construct. It also didn't allow
logical expressions inside normal expressions:
i = ($1 == 2 || $2 ~ /bar/)
a2p.h had definition of a bzero() macro inside an ifdef of BCOPY.
The two don't always go together, and since Configure is already
looking for both separately...
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A few of the new features: (18 Oct)
* Perl can now handle binary data correctly and has functions to pack and unpack binary structures into arrays or lists. You can now do arbitrary ioctl functions.
* You can now pass things to subroutines by reference.
* Debugger enhancements.
* An array or associative array may now appear in a local() list.
* Array values may now be interpolated into strings.
* Subroutine names are now distinguished by prefixing with &. You can call subroutines without using do, and without passing any argument list at all.
* You can use the new -u switch to cause perl to dump core so that you can run undump and produce a binary executable image. Alternately you can use the "dump" operator after initializing any variables and such.
* You can now chop lists.
* Perl now uses /bin/csh to do filename globbing, if available. This means that filenames with spaces or other strangenesses work right.
* New functions: mkdir and rmdir, getppid, getpgrp and setpgrp, getpriority and setpriority, chroot, ioctl and fcntl, flock, readlink, lstat, rindex, pack and unpack, read, warn, dbmopen and dbmclose, dump, reverse, defined, undef.
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Some of the enhancements from Perl1 included:
* New regexp routines derived from Henry Spencer's.
o Support for /(foo|bar)/.
o Support for /(foo)*/ and /(foo)+/.
o \s for whitespace, \S for non-, \d for digit, \D nondigit
* Local variables in blocks, subroutines and evals.
* Recursive subroutine calls are now supported.
* Array values may now be interpolated into lists: unlink 'foo', 'bar', @trashcan, 'tmp';
* File globbing.
* Use of <> in array contexts returns the whole file or glob list.
* New iterator for normal arrays, foreach, that allows both read and write.
* Ability to open pipe to a forked off script for secure pipes in setuid scripts.
* File inclusion via do 'foo.pl';
* More file tests, including -t to see if, for instance, stdin is a terminal. File tests now behave in a more correct manner. You can do file tests on filehandles as well as filenames. The special filetests -T and -B test a file to see if it's text or binary.
* An eof can now be used on each file of the <> input for such purposes as resetting the line numbers or appending to each file of an inplace edit.
* Assignments can now function as lvalues, so you can say things like ($HOST = $host) =~ tr/a-z/A-Z/; ($obj = $src) =~ s/\.c$/.o/;
* You can now do certain file operations with a variable which holds the name of a filehandle, e.g. open(++$incl,$includefilename); $foo = <$incl>;
* Warnings are now available (with -w) on use of uninitialized variables and on identifiers that are mentioned only once, and on reference to various undefined things.
* There is now a wait operator.
* There is now a sort operator.
* The manual is now not lying when it says that perl is generally faster than sed. I hope.
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[ Perl is kind of designed to make awk and sed semi-obsolete. This posting
will include the first 10 patches after the main source. The following
description is lifted from Larry's manpage. --r$ ]
Perl is a interpreted language optimized for scanning arbitrary text
files, extracting information from those text files, and printing
reports based on that information. It's also a good language for many
system management tasks. The language is intended to be practical
(easy to use, efficient, complete) rather than beautiful (tiny,
elegant, minimal). It combines (in the author's opinion, anyway) some
of the best features of C, sed, awk, and sh, so people familiar with
those languages should have little difficulty with it. (Language
historians will also note some vestiges of csh, Pascal, and even
BASIC-PLUS.) Expression syntax corresponds quite closely to C
expression syntax. If you have a problem that would ordinarily use sed
or awk or sh, but it exceeds their capabilities or must run a little
faster, and you don't want to write the silly thing in C, then perl may
be for you. There are also translators to turn your sed and awk
scripts into perl scripts.
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