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Plan 9 - man page for memory (plan9 section 2)

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MEMORY(2)										MEMORY(2)

       memccpy, memchr, memcmp, memcpy, memmove, memset - memory operations

       #include <u.h>
       #include <libc.h>

       void* memccpy(void *s1, void *s2, int c, long n)

       void* memchr(void *s, int c, long n)

       int   memcmp(void *s1, void *s2, long n)

       void* memcpy(void *s1, void *s2, long n)

       void* memmove(void *s1, void *s2, long n)

       void* memset(void *s, int c, long n)

       These  functions  operate efficiently on memory areas (arrays of bytes bounded by a count,
       not terminated by a zero byte).	They do not check for the overflow of any receiving  mem-
       ory area.

       Memccpy	copies	bytes from memory area s2 into s1, stopping after the first occurrence of
       byte c 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 zero if c was not found in the
       first n bytes of s2.

       Memchr returns a pointer to the first occurrence of byte c in the first n bytes of  memory
       area s, or zero if c does not occur.

       Memcmp  compares  its arguments, looking at the first n bytes only, 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.  The comparison is bytewise unsigned.

       Memcpy copies n bytes from memory area s2 to s1.  It returns s1.

       Memmove works like memcpy, except that it is guaranteed to work if s1 and s2 overlap.

       Memset sets the first n bytes in memory area s to the value of byte c.  It returns s.

       All  these routines have portable C implementations in /sys/src/libc/port.  Most also have
       machine-dependent assembly language implementations in /sys/src/libc/$objtype.


       ANSI C does not require memcpy to handle overlapping source and destination; on Plan 9, it
       does, so memmove and memcpy behave identically.

       If memcpy and memmove are handed a negative count, they abort.

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