＞Where an argument declared as size_t n specifies the length of the array for a ＞function, n can have the value zero on a call to that function. Unless explicitly stated ＞otherwise in the description of a particular function in this subclause, pointer arguments ＞on such a call shall still have valid values, as described in 7.1.4. On such a call, a ＞function that locates a character finds no occurrence, a function that compares two ＞character sequences returns zero, and a function that copies characters copies zero ＞characters.
