Source to kern/subr_xxx.c
/*
* Copyright (c) 1982, 1986, 1991 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)subr_xxx.c 7.10 (Berkeley) 4/20/91
*/
/*
* Miscellaneous trivial functions, including many
* that are often inline-expanded or done in assembler.
*/
#include "param.h"
#include "systm.h"
#include "machine/cpu.h"
/*
* Unsupported device function (e.g. writing to read-only device).
*/
enodev()
{
return (ENODEV);
}
/*
* Unconfigured device function; driver not configured.
*/
enxio()
{
return (ENXIO);
}
/*
* Unsupported ioctl function.
*/
enoioctl()
{
return (ENOTTY);
}
/*
* Unsupported system function.
* This is used for an otherwise-reasonable operation
* that is not supported by the current system binary.
*/
enosys()
{
return (ENOSYS);
}
/*
* Return error for operation not supported
* on a specific object or file type.
*/
eopnotsupp()
{
return (EOPNOTSUPP);
}
/*
* Generic null operation, always returns success.
*/
nullop()
{
return (0);
}
/*
* Definitions of various trivial functions;
* usually expanded inline rather than being defined here.
*/
#ifdef NEED_MINMAX
imin(a, b)
int a, b;
{
return (a < b ? a : b);
}
imax(a, b)
int a, b;
{
return (a > b ? a : b);
}
unsigned int
min(a, b)
unsigned int a, b;
{
return (a < b ? a : b);
}
unsigned int
max(a, b)
unsigned int a, b;
{
return (a > b ? a : b);
}
long
lmin(a, b)
long a, b;
{
return (a < b ? a : b);
}
long
lmax(a, b)
long a, b;
{
return (a > b ? a : b);
}
unsigned long
ulmin(a, b)
unsigned long a, b;
{
return (a < b ? a : b);
}
unsigned long
ulmax(a, b)
unsigned long a, b;
{
return (a > b ? a : b);
}
#endif /* NEED_MINMAX */
#ifdef NEED_FFS
ffs(mask)
register long mask;
{
register int bit;
if (!mask)
return(0);
for (bit = 1;; ++bit) {
if (mask&0x01)
return(bit);
mask >>= 1;
}
}
#endif /* NEED_FFS */
#ifdef NEED_BCMP
bcmp(v1, v2, len)
void *v1, *v2;
register unsigned len;
{
register u_char *s1 = v1, *s2 = v2;
while (len--)
if (*s1++ != *s2++)
return (1);
return (0);
}
#endif /* NEED_BCMP */
#ifdef NEED_STRLEN
strlen(s1)
register char *s1;
{
register int len;
for (len = 0; *s1++ != '\0'; len++)
;
return (len);
}
#endif /* NEED_STRLEN */