Обсуждение: OFFTOPIC: core dumped with strcpy,atoi,sprintf.

Hi.
I hope you can help me. I have problems with some functions like
strcpy, atoi, etc and  would like to know the correct list where I have
to ask this:



I have compiled a program  under SCO Openserver, and  run succesfully.
But when  i compile the same program in Ubuntu  12.04,  i got a core dump.


Debugging the program, found that the core is generated  by atoi,
sprintf and similar functions; because that functions fails when
received  a null pointer (NULL). But, if  the functions received  an
empty string ("") the program continues and run succesfully.


Yes,  I should validate each input pointers. But, its odd that works in
SCO and not in Linux, and its odder that fails in functions like strcpy,
atoi, sprintf, etc.


I have a lot of programs that i should compile in boths operative
systems. And if you kown something that can  help me, really, really i'd
appreciate.  :-)


Regards.
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"Ing.Edmundo.Robles.Lopez" <erobles@sensacd.com.mx> writes:
> Debugging the program, found that the core is generated  by atoi,
> sprintf and similar functions; because that functions fails when
> received  a null pointer (NULL). But, if  the functions received  an
> empty string ("") the program continues and run succesfully.

> Yes,  I should validate each input pointers. But, its odd that works in
> SCO and not in Linux, and its odder that fails in functions like strcpy,
> atoi, sprintf, etc.

Not really.  Per the POSIX spec, the behavior of those functions is
undefined for NULL input pointers.  Some platforms are forgiving about
it, most are not.

            regards, tom lane

On Fri, Sep 14, 2012 at 10:37 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> "Ing.Edmundo.Robles.Lopez" <erobles@sensacd.com.mx> writes:
>> Debugging the program, found that the core is generated  by atoi,
>> sprintf and similar functions; because that functions fails when
>> received  a null pointer (NULL). But, if  the functions received  an
>> empty string ("") the program continues and run succesfully.
>
>> Yes,  I should validate each input pointers. But, its odd that works in
>> SCO and not in Linux, and its odder that fails in functions like strcpy,
>> atoi, sprintf, etc.
>
> Not really.  Per the POSIX spec, the behavior of those functions is
> undefined for NULL input pointers.  Some platforms are forgiving about
> it, most are not.

I learned C on a platform with no memory protection wherein a null
pointer would result in a write to location 0 and an immediate machine
crash.  Wow, that was a LONG time ago (late 80s).  Kids today.  Got it
easy.