Fix printing of empty string pointers
Once the check if str is NULL is reached, str has already been derereferenced in the for loop, so in the case that the if clause would be entered, the program has already crashed due to a null pointer dereference. By checking the content of str before dereferencing, the code in the if clause is actually useful. for (ptr=str;*ptr;ptr++) flag|=((*ptr>0 && *ptr<32)||(*ptr=='\"')||(*ptr=='\\'))?1:0; ... if (!str) ...
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