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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