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Annotation of 43BSDReno/sys/kern/subr_xxx.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)subr_xxx.c  7.7 (Berkeley) 5/15/90
        !             7:  */
        !             8: 
        !             9: #include "errno.h"
        !            10: 
        !            11: /*
        !            12:  * Routine placed in illegal entries in the bdevsw and cdevsw tables.
        !            13:  */
        !            14: nodev()
        !            15: {
        !            16: 
        !            17:        return (ENODEV);
        !            18: }
        !            19: 
        !            20: /*
        !            21:  * Null routine; placed in insignificant entries
        !            22:  * in the bdevsw and cdevsw tables.
        !            23:  */
        !            24: nulldev()
        !            25: {
        !            26: 
        !            27:        return (0);
        !            28: }
        !            29: 
        !            30: /*
        !            31:  * Definitions of various trivial functions;
        !            32:  * usually expanded inline rather than being defined here.
        !            33:  */
        !            34: #if !defined(vax) && !defined(tahoe)
        !            35: imin(a, b)
        !            36: {
        !            37: 
        !            38:        return (a < b ? a : b);
        !            39: }
        !            40: 
        !            41: imax(a, b)
        !            42: {
        !            43: 
        !            44:        return (a > b ? a : b);
        !            45: }
        !            46: 
        !            47: unsigned
        !            48: min(a, b)
        !            49:        unsigned a, b;
        !            50: {
        !            51: 
        !            52:        return (a < b ? a : b);
        !            53: }
        !            54: 
        !            55: unsigned
        !            56: max(a, b)
        !            57:        unsigned a, b;
        !            58: {
        !            59: 
        !            60:        return (a > b ? a : b);
        !            61: }
        !            62: #endif
        !            63: 
        !            64: #if !defined(vax) && !defined(tahoe) && !defined(hp300)
        !            65: ffs(mask)
        !            66:        register long mask;
        !            67: {
        !            68:        register int bit;
        !            69: 
        !            70:        if (!mask)
        !            71:                return(0);
        !            72:        for (bit = 1;; ++bit)
        !            73:                if (mask&0x01)
        !            74:                        return(bit);
        !            75:                mask >>= 1;
        !            76:        }
        !            77: }
        !            78: #endif
        !            79: 
        !            80: #if !defined(vax) && !defined(hp300)
        !            81: bcmp(s1, s2, len)
        !            82:        register char *s1, *s2;
        !            83:        register unsigned len;
        !            84: {
        !            85: 
        !            86:        while (len--)
        !            87:                if (*s1++ != *s2++)
        !            88:                        return (1);
        !            89:        return (0);
        !            90: }
        !            91: 
        !            92: strlen(s1)
        !            93:        register char *s1;
        !            94: {
        !            95:        register int len;
        !            96: 
        !            97:        for (len = 0; *s1++ != '\0'; len++)
        !            98:                /* void */;
        !            99:        return (len);
        !           100: }
        !           101: #endif

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