MEMORY(3) 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 (arrays of characters bounded by a count, not termi-
nated by a null character). They do not check for the over-
flow of any receiving memory area.
Memccpy copies characters from memory area s2 into s1, stop-
ping after the first occurrence of character c has been
copied, or after n characters 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 charac-
ter 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 char-
acters 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.
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
MEMORY(3) MEMORY(3)
value of character c. It returns s.
SEE ALSO
string(3)
BUGS
Memcmp use native character comparison, which is signed on
some machines, 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 implementa-
tions.