Examples of unsafe functions are:

• I/O functions that could cause a buffer overflow such as scanf, fscanf and gets.
• String buffer access functions that could cause a buffer overflow such as sprintf, sscanf, strcat, strcpy, and __builtin___sprintf_chk.
• Pseudo-random number generation functions for which it is too easy to break the encryption such as initstate, lcong48, rand, random, seed48, setstate, and [dejlmn]rand48.