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MEMORY(3)                  Library Functions Manual                  MEMORY(3)



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

SYNOPSIS
       char *memccpy (s1, s2, c, n)
       char *s1, *s2;
       int c, n;

       char *memchr (s, c, n)
       char *s;
       int c, n;

       int memcmp (s1, s2, n)
       char *s1, *s2;
       int n;

       char *memcpy (s1, s2, n)
       char *s1, *s2;
       int n;

       char *memset (s, c, n)
       char *s;
       int c, n;

DESCRIPTION
       These functions operate as efficiently as possible on memory areas (ar‐
       rays of characters bounded by a count, not terminated by a null charac‐
       ter).  They do not check for the overflow of any receiving memory area.

       Memccpy  copies  characters from memory area s2 into s1, stopping after
       the first occurrence of character c has been copied, or after n charac‐
       ters  have been copied, whichever comes first.  It returns a pointer to
       the character after the copy of c in s1, or zero if c was not found  in
       the first n characters of s2.

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

       Memcmp compares its arguments, looking at the first n characters  only,
       and  returns an integer less than, equal to, or greater than 0, accord‐
       ing as s1 is lexicographically less than, equal to, or greater than s2.

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

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

SEE ALSO
       string(3)

BUGS
       Memcmp  use  native  character  comparison, which is signed on some ma‐
       chines, unsigned on others; thus the sign of the value returned when  a
       character has its high-order bit set is implementation-dependent.
       The outcome of overlapping moves varies among implementations.



                                                                     MEMORY(3)