The wcstombs() function converts the sequence of wide-character codes from the array pointed to by pwcs into a sequence of characters and stores these characters
into the array pointed to by s, stopping if a character would exceed the limit of n total bytes or if a null byte is stored. Each wide-character code is converted
as if by a call to wctomb(3C).
The behavior of this function is affected by the LC_CTYPE category of the current locale.
No more than n bytes will be modified in the array pointed to by s. If copying takes place between objects that overlap, the behavior is undefined. If s is a null pointer, wcstombs() returns the length required to convert the entire array regardless of the value of n, but no values are stored.
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