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[ID 20010327.008] inconsistant return value from split

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Cory Johns
March 27, 2001 15:26
[ID 20010327.008] inconsistant return value from split
Message ID:
This is a bug report for perl from,
generated with the help of perlbug 1.26 running under perl 5.00503.

[Please enter your report here]

If the string to split does not contain the specified delimiter to split on,
split will return a single element list _if, and only if_ the string to split
is non-empty.  If the input string _is_ empty, split returns an empty list,
regardless of the LIMIT specified (ie, even if LIMIT is -1).

Some psuedo-code:

  $str = 'Any non-empty string not containing $delim';
  @result = split($delim, $str, -1);                    # @result == ($str)

  $str = '';
  @result = split($delim, $str, -1);                    # @result != ($str)
                                                        # @result == ()        !!!

I understand that this is maybe not a "bug", per se (depending on your point
of view) but it is non-intuitive behaviour and can cause unexpected results
(such as the BLOCK of a map statement never being called after a split on an
empty string, which would be how I found it).

[Please do not change anything below this line]

Site configuration information for perl 5.00503:

Configured by root at Wed Feb  2 15:34:50 EST 2000.

Summary of my perl5 (5.0 patchlevel 5 subversion 3) configuration:
    osname=linux, osvers=2.2.5-22smp, archname=i386-linux
    uname='linux 2.2.5-22smp #1 smp wed jun 2 09:11:51 edt 1999 i686 unknown '
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
    cc='cc', optimize='-O2 -m486 -fno-strength-reduce', gccversion=egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
    cppflags='-Dbool=char -DHAS_BOOL -I/usr/local/include'       
    ccflags ='-Dbool=char -DHAS_BOOL -I/usr/local/include'       
    stdchar='char', d_stdstdio=undef, usevfork=false             
    intsize=4, longsize=4, ptrsize=4, doublesize=8               
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    alignbytes=4, usemymalloc=n, prototype=define                
  Linker and Libraries:                                          
    ld='cc', ldflags =' -L/usr/local/lib'                        
    libpth=/usr/local/lib /lib /usr/lib                          
    libs=-lnsl -ldl -lm -lc -lposix -lcrypt                      
    libc=, so=so, useshrplib=false, libperl=libperl.a            
  Dynamic Linking:                                               
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'     
Locally applied patches:                                         
@INC for perl 5.00503:                                           
Environment for perl 5.00503:                                    
    LANGUAGE (unset)                                             
    LD_LIBRARY_PATH (unset)                                      
    LOGDIR (unset)                                               
    PERL_BADLANG (unset)                                         

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