On Mon, Dec 16, 2013 at 03:41:00PM -0800, Shawn Landden wrote: > While all the libc implementations I know return NULL when memchr's size > parameter is 0, without accessing any memory, passing NULL to memchr is > still invalid: > > C11 7.24.1p2: 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. This analysis seems correct. Applied.
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