AT&T UNIX™PC Unix System V Users Manual - tenox

MEMORY ( 3C ) MEMORY ( 3C )
NAME
memccpy, memchr, memcmp, memcpy, memset - memory operations
SYNOPSIS
#include
char •memccpy (sl, s2, c, n)
char •sl, •s2;
int c, n;
char •memchr (s, c, n)
char •s;
int c, n;
int memcmp (sl, s2 , n)
char •sl, •s2;
int n;
char •memcpy (sl, s2, n)
char •sl, •s2;
int n;
char •memset (s, c, n)
char •s;
int c, n;
DESCRIPTION
These functions operate efficiently on memory areas (arrays of
characters bounded by a count, not terminated by a null character).
They do not check for the overflow of any receiving memory
area.
Memccpy copies characters from memory area 82 into 81 , stopping
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 81 , or a
NULL pointer if c was not found in the first n characters of 82.
Memchr returns a pointer to the first occurrence of character c in
the first n characters of memory area 8, or a NULL pointer 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,
according as 81 is lexicographically less than, equal to, or greater
than 82.
Memcpy copies n characters from memory area 82 to 81 . It
returns 81 .
Mem8et sets the first n characters in memory area 8 to the value
of character c. It returns 8 •
NOTE
For user convenience, all these functions are declared in the
optional header file.
BUGS
Memcmp uses native character comparison, which is signed on
PDP-Us, unsigned on other machines.
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