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These functions operate as efficiently as possible on memory areas
(arrays of bytes bounded by a count, not terminated by a null character).
They do not check for the overflow of any receiving memory area.
The memccpy() function copies bytes from memory
area s2 into s1, stopping
after the first occurrence of c (converted to an unsigned char) has been copied, or after n
bytes have been copied, whichever comes first. It returns a pointer to the
byte after the copy of c in s1,
or a null pointer if c was not found in the first n bytes of s2.
The memchr() function returns a pointer to the
first occurrence of c (converted to an unsigned char) in the first n bytes (each
interpreted as an unsigned char) of memory area s, or a null pointer if c does not occur.
The memcmp() function compares its arguments, looking
at the first n bytes (each interpreted as an unsigned char), and returns an integer less than, equal to, or
greater than 0, according as s1 is lexicographically
less than, equal to, or greater than s2 when taken
to be unsigned characters.
The memcpy() function copies n
bytes from memory area s2 to s1.
It returns s1.
The memmove() function copies n
bytes from memory areas s2 to s1.
Copying between objects that overlap will take place correctly. It returns s1.
The memset() function sets the first n bytes in memory area s to the value
of c (converted to an unsigned char).
It returns s.
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