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strdup(null) dumps core.
Tried in on ubuntu and freeBSD both.
why? Shouldn’t it return null?
char *b = NULL;
a = strdup(b);
This will dump core on strdup call.
That’s quite ok.
The documentation implies that it’s argument must be string, if it’s something else, such as a null pointer, it’s anyones guess what’ll happen. In essence, you get undefined behavior when passing a NULL pointer to strdup.
It’s quite normal for functions to yield undefined behavor if you pass them something you’re not supposed to. Many standard C function such as strcpy, strlen does not accept null pointers either.