NAME
skpc, scanc,
bcmp, timingsafe_bcmp,
memchr, memcmp —
kernel library byte string
routines
SYNOPSIS
#include
<lib/libkern/libkern.h>
int
skpc(int
mask, size_t size,
u_char *cp);
int
scanc(u_int
size, const u_char
*cp, const u_char
*table, int
mask);
int
bcmp(const
void *b1, const void
*b2, size_t
len);
int
timingsafe_bcmp(const
void *b1, const void
*b2, size_t
len);
void *
memchr(const
void *b, int c,
size_t len);
int
memcmp(const
void *b1, const void
*b2, size_t
len);
DESCRIPTION
The
skpc()
function locates the first unsigned character of value different than
mask inside the string cp.
The
scanc()
function expects a string of indexes into the table
table. Each table element is bitwise ANDed against
mask.
skpc()
and scanc() expect the string to be of size
size, and return the index relative to the end of the
string where the match occurred, or zero if mask is
not present in the string.
The remaining functions have the same semantics as their libc counterparts, bcmp(3), timingsafe_bcmp(3), memchr(3), and memcmp(3).
STANDARDS
The memchr() and
memcmp() functions conform to ANSI
X3.159-1989 (“ANSI C89”).
HISTORY
The skpc() and
scanc() functions are based on vax instructions of
the same name.