[RPL/2] Interesting error

[BERTRAND Joël]

BERTRAND Joël wrote:
> Adrian Blake wrote:
>> Try this
>>
>> RPL/2> << >> 1 2 { 5 + 4 } exsub
>>
>> RPL/2> help
>> +++System : Memory allocation error
>> *** glibc detected *** rpl: free(): invalid pointer: 0xb7bd1150 ***
>> ======= Backtrace: =========
>> /lib/i686/libc.so.6[0xb7afb4e6]
>> /lib/i686/libc.so.6(cfree+0x90)[0xb7aff010]
>> rpl(liberation+0x1dd)[0x807a8ed]
>> rpl(rplinit+0x27eb)[0x8147f8b]
>> rpl(main+0x2a)[0x8150bba]
>> /lib/i686/libc.so.6(__libc_start_main+0xe0)[0xb7aa9f90]
>> rpl[0x8061931]
>> ======= Memory map: ========
>> 08048000-082b2000 r-xp 00000000 08:05 412562     /usr/local/bin/rpl
>> 082b2000-082bc000 rwxp 0026a000 08:05 412562     /usr/local/bin/rpl
>> 082bc000-08336000 rwxp 082bc000 00:00 0          [heap]
>> b7500000-b7521000 rwxp b7500000 00:00 0
>> b7521000-b7600000 ---p b7521000 00:00 0
>> b7650000-b768f000 r-xp 00000000 08:05 417386     /usr/share/locale/UTF-8/LC_CTYPE
>> b768f000-b7691000 rwxp b768f000 00:00 0
>> b7691000-b7696000 r-xp 00000000 08:05 405361     /usr/lib/libXdmcp.so.6.0.0
>> b7696000-b7697000 rwxp 00004000 08:05 405361     /usr/lib/libXdmcp.so.6.0.0
>>
>> etc.
>>
>>
>> Does anyone else get the same error ??
>>
>> After executing << >> 1 2 { 5 + 4 } exsub, try something else, same error?
>>
>> Put the line in an executable file and run, same error ?
> 
> 	Yes, there is a bug. You cannot write << >> 1 2 { 5 + 4 } exsub because 
> a expression must start with '<<' and stop with '>>'. You have to write :
> 
> RPL/2> << RELAX >> 2 2 { 5 + 4 } exsub
> 
> 1: << 5 + 4 >>
> RPL/2>
> 
> 	I will fix this mistake as soon as possible. Thanks for report,

	I confirm the bug, but I haven't find any fix yet. I don't understand 
why exsub returns an error (and why this error comes from a NULL pointer 
in a malloc() condition).

	Nevertheless, this bug only occurs when you try to replace initial and 
final delimitors. Thus you can use << RELAX >>. RELAX intrinsic is a 
internal function that requires no argument and that do anything else. I 
shall find a fix tomorrow if I have more time...

	Regards,

	JKB