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Annotation of Net2/kern/subr_xxx.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986, 1991 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)subr_xxx.c  7.10 (Berkeley) 4/20/91
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * Miscellaneous trivial functions, including many
        !            38:  * that are often inline-expanded or done in assembler.
        !            39:  */
        !            40: #include "param.h"
        !            41: #include "systm.h"
        !            42: #include "machine/cpu.h"
        !            43: 
        !            44: /*
        !            45:  * Unsupported device function (e.g. writing to read-only device).
        !            46:  */
        !            47: enodev()
        !            48: {
        !            49: 
        !            50:        return (ENODEV);
        !            51: }
        !            52: 
        !            53: /*
        !            54:  * Unconfigured device function; driver not configured.
        !            55:  */
        !            56: enxio()
        !            57: {
        !            58: 
        !            59:        return (ENXIO);
        !            60: }
        !            61: 
        !            62: /*
        !            63:  * Unsupported ioctl function.
        !            64:  */
        !            65: enoioctl()
        !            66: {
        !            67: 
        !            68:        return (ENOTTY);
        !            69: }
        !            70: 
        !            71: /*
        !            72:  * Unsupported system function.
        !            73:  * This is used for an otherwise-reasonable operation
        !            74:  * that is not supported by the current system binary.
        !            75:  */
        !            76: enosys()
        !            77: {
        !            78: 
        !            79:        return (ENOSYS);
        !            80: }
        !            81: 
        !            82: /*
        !            83:  * Return error for operation not supported
        !            84:  * on a specific object or file type.
        !            85:  */
        !            86: eopnotsupp()
        !            87: {
        !            88: 
        !            89:        return (EOPNOTSUPP);
        !            90: }
        !            91: 
        !            92: /*
        !            93:  * Generic null operation, always returns success.
        !            94:  */
        !            95: nullop()
        !            96: {
        !            97: 
        !            98:        return (0);
        !            99: }
        !           100: 
        !           101: /*
        !           102:  * Definitions of various trivial functions;
        !           103:  * usually expanded inline rather than being defined here.
        !           104:  */
        !           105: #ifdef NEED_MINMAX
        !           106: imin(a, b)
        !           107:        int a, b;
        !           108: {
        !           109: 
        !           110:        return (a < b ? a : b);
        !           111: }
        !           112: 
        !           113: imax(a, b)
        !           114:        int a, b;
        !           115: {
        !           116: 
        !           117:        return (a > b ? a : b);
        !           118: }
        !           119: 
        !           120: unsigned int
        !           121: min(a, b)
        !           122:        unsigned int a, b;
        !           123: {
        !           124: 
        !           125:        return (a < b ? a : b);
        !           126: }
        !           127: 
        !           128: unsigned int
        !           129: max(a, b)
        !           130:        unsigned int a, b;
        !           131: {
        !           132: 
        !           133:        return (a > b ? a : b);
        !           134: }
        !           135: 
        !           136: long
        !           137: lmin(a, b)
        !           138:        long a, b;
        !           139: {
        !           140: 
        !           141:        return (a < b ? a : b);
        !           142: }
        !           143: 
        !           144: long
        !           145: lmax(a, b)
        !           146:        long a, b;
        !           147: {
        !           148: 
        !           149:        return (a > b ? a : b);
        !           150: }
        !           151: 
        !           152: unsigned long
        !           153: ulmin(a, b)
        !           154:        unsigned long a, b;
        !           155: {
        !           156: 
        !           157:        return (a < b ? a : b);
        !           158: }
        !           159: 
        !           160: unsigned long
        !           161: ulmax(a, b)
        !           162:        unsigned long a, b;
        !           163: {
        !           164: 
        !           165:        return (a > b ? a : b);
        !           166: }
        !           167: #endif /* NEED_MINMAX */
        !           168: 
        !           169: #ifdef NEED_FFS
        !           170: ffs(mask)
        !           171:        register long mask;
        !           172: {
        !           173:        register int bit;
        !           174: 
        !           175:        if (!mask)
        !           176:                return(0);
        !           177:        for (bit = 1;; ++bit) {
        !           178:                if (mask&0x01)
        !           179:                        return(bit);
        !           180:                mask >>= 1;
        !           181:        }
        !           182: }
        !           183: #endif /* NEED_FFS */
        !           184: 
        !           185: #ifdef NEED_BCMP
        !           186: bcmp(v1, v2, len)
        !           187:        void *v1, *v2;
        !           188:        register unsigned len;
        !           189: {
        !           190:        register u_char *s1 = v1, *s2 = v2;
        !           191: 
        !           192:        while (len--)
        !           193:                if (*s1++ != *s2++)
        !           194:                        return (1);
        !           195:        return (0);
        !           196: }
        !           197: #endif /* NEED_BCMP */
        !           198: 
        !           199: #ifdef NEED_STRLEN
        !           200: strlen(s1)
        !           201:        register char *s1;
        !           202: {
        !           203:        register int len;
        !           204: 
        !           205:        for (len = 0; *s1++ != '\0'; len++)
        !           206:                ;
        !           207:        return (len);
        !           208: }
        !           209: #endif /* NEED_STRLEN */

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