usr/src/sys/sys/subr_xxx.c

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)subr_xxx.c  7.5 (Berkeley) 7/21/87
 */

#include "errno.h"

/*
 * Routine placed in illegal entries in the bdevsw and cdevsw tables.
 */
nodev()
{

        return (ENODEV);
}

/*
 * Null routine; placed in insignificant entries
 * in the bdevsw and cdevsw tables.
 */
nulldev()
{

        return (0);
}

/*
 * Definitions of various trivial functions;
 * usually expanded inline rather than being defined here.
 */
#if !defined(vax) && !defined(tahoe)
imin(a, b)
{

        return (a < b ? a : b);
}

imax(a, b)
{

        return (a > b ? a : b);
}

unsigned
min(a, b)
        u_int a, b;
{

        return (a < b ? a : b);
}

unsigned
max(a, b)
        u_int a, b;
{

        return (a > b ? a : b);
}
#endif

#if !defined(vax) && !defined(tahoe)
ffs(mask)
        register long mask;
{
        register int i;

        for(i = 1; i < NSIG; i++) {
                if (mask & 1)
                        return (i);
                mask >>= 1;
        }
        return (0);
}
#endif

#if !defined(vax)
bcmp(s1, s2, len)
        register char *s1, *s2;
        register unsigned len;
{

        while (len--)
                if (*s1++ != *s2++)
                        return (1);
        return (0);
}

strlen(s1)
        register char *s1;
{
        register int len;

        for (len = 0; *s1++ != '\0'; len++)
                /* void */;
        return (len);
}
#endif