From ariels@compugen.co.il

When I enter a very long input line in the Perl debugger, it appears
to be chopped off around the 256 character mark. [Since it appears to
expect a new token at that point, I was unable to verify the exact
location where things break, but I suspect 256 or 255 characters, for
obvious reasons].

Here's a sample transcript from the debugger (taken while running
"perl -de 42")​:

  DB<24> $x = '0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789'

  DB<24> p $x
01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
  DB<25> $x = '01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789'
String found where operator expected at (eval 29) line 2, at end of line
  eval '($@,$!, ${}^E,$,, $/,$\\, ${}^W)=@saved;packagemain;$^D = $^D | $DB​::db_stop;
123456789\';

;' called at /usr/local/lib/perl5/5.00503/perl5db.pl line 1239
  DB​::eval called at /usr/local/lib/perl5/5.00503/perl5db.pl line 1133
  DB​::DB called at -e line 1
  (Missing operator before ?)
  eval '($@,$!, ${}^E,$,, $/,$\\, ${}^W)=@saved;packagemain;$^D = $^D | $DB​::db_stop;
123456789\';

;' called at /usr/local/lib/perl5/5.00503/perl5db.pl line 1239
  DB​::eval called at /usr/local/lib/perl5/5.00503/perl5db.pl line 1133
  DB​::DB called at -e line 1
Can't find string terminator "'" anywhere before EOF at (eval 29) line 2, <IN> chunk 26.
  eval '($@,$!, ${}^E,$,, $/,$\\, ${}^W)=@saved;packagemain;$^D = $^D | $DB​::db_stop;
123456789\';

;' called at /usr/local/lib/perl5/5.00503/perl5db.pl line 1239
  DB​::eval called at /usr/local/lib/perl5/5.00503/perl5db.pl line 1133
  DB​::DB called at -e line 1

  DB<26>

I apologise for not providing a more detailed analysis.

Many thanks.

Site configuration information for perl 5.00503:

Configured by mike at Fri Jun  4 12:44:49 IDT 1999.

Summary of my perl5 (5.0 patchlevel 5 subversion 3) configuration:
  Platform:
    osname=solaris, osvers=2.6, archname=sun4-solaris
    uname='sunos cosmos 5.6 generic_105181-11 sun4u sparc sunw,ultra-2 '
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
  Compiler:
    cc='cc', optimize='-fast', gccversion=
    cppflags='-I/usr/local/include'
    ccflags ='-I/usr/local/include'
    stdchar='unsigned char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    alignbytes=8, usemymalloc=y, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib /usr/ccs/lib
    libs=-lsocket -lnsl -lgdbm -ldl -lm -lc -lcrypt
    libc=/lib/libc.so, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-KPIC', lddlflags='-G -L/usr/local/lib'

Locally applied patches:
    


@INC for perl 5.00503:
    /home/ariels/lib/perl5
    /home/ariels/lib/perl5/site_perl/sun4-solaris
    /home/ariels/lib/perl5/site_perl
    /usr/local/lib/perl5/5.00503/sun4-solaris
    /usr/local/lib/perl5/5.00503
    /usr/local/lib/perl5/site_perl/sun4-solaris
    /usr/local/lib/perl5/site_perl
    .


Environment for perl 5.00503:
    HOME=/home/ariels
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH=/opt/SUNWspro/SC2.0.1:/opt/SUNWspro/SC3.0.1:/usr/openwin/lib:/usr/local/lib
    LOGDIR (unset)
    PATH=.:/home/ariels/bin:/home/ariels/bin/SUNexe:/usr/atria/bin:/usr/bin:/usr/sbin:/etc:/usr/etc:/usr/openwin/bin/xview:/usr/openwin/bin:/usr/local/bin:/usr/ccs/bin:/usr/openwin:/usr/openwin/demo:/usr/local/opt/SUNWspro/bin:/usr/local/opt/SUNWss/bin:/usr/ucb:/usr/local/tex/TeX/bin:/usr/local/kde/bin
    PERL5LIB=/home/ariels/lib/perl5:/home/ariels/lib/perl5/site_perl
    PERL_BADLANG (unset)
    SHELL=/bin/tcsh

From [Unknown Contact. See original ticket]

Ariel Scolnicov writes​:

When I enter a very long input line in the Perl debugger, it appears
to be chopped off around the 256 character mark.

What happens if you enter this line to

  perl -wle '$in = <STDIN>; print "Entered​: <$in>"';

?

Most probably it is your system's tty-handler's buffer. Get
Term​::ReadLine​::{Perl|Gnu} to substitute a different input method.

Ilya