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Annotation of XNU/osfmk/i386/loose_ends.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * @OSF_COPYRIGHT@
        !            24:  */
        !            25: /* 
        !            26:  * Mach Operating System
        !            27:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
        !            28:  * All Rights Reserved.
        !            29:  * 
        !            30:  * Permission to use, copy, modify and distribute this software and its
        !            31:  * documentation is hereby granted, provided that both the copyright
        !            32:  * notice and this permission notice appear in all copies of the
        !            33:  * software, derivative works or modified versions, and any portions
        !            34:  * thereof, and that both notices appear in supporting documentation.
        !            35:  * 
        !            36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            39:  * 
        !            40:  * Carnegie Mellon requests users of this software to return to
        !            41:  * 
        !            42:  *  Software Distribution Coordinator  or  [email protected]
        !            43:  *  School of Computer Science
        !            44:  *  Carnegie Mellon University
        !            45:  *  Pittsburgh PA 15213-3890
        !            46:  * 
        !            47:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            48:  * the rights to redistribute these changes.
        !            49:  */
        !            50: /*
        !            51:  */
        !            52: #include <mach_assert.h>
        !            53: 
        !            54: #include <string.h>
        !            55: #include <mach/boolean.h>
        !            56: #include <mach/i386/vm_types.h>
        !            57: #include <kern/kern_types.h>
        !            58: #include <kern/misc_protos.h>
        !            59: #include <i386/misc_protos.h>
        !            60: 
        !            61:        /*
        !            62:         * Should be rewritten in asm anyway.
        !            63:         */
        !            64: /* 
        !            65:  * ovbcopy - like bcopy, but recognizes overlapping ranges and handles 
        !            66:  *           them correctly.
        !            67:  */
        !            68: 
        !            69: void
        !            70: ovbcopy(
        !            71:        const char      *from,
        !            72:        char            *to,
        !            73:        vm_size_t       bytes)          /* num bytes to copy */
        !            74: {
        !            75:        /* Assume that bcopy copies left-to-right (low addr first). */
        !            76:        if (from + bytes <= to || to + bytes <= from || to == from)
        !            77:                bcopy(from, to, bytes); /* non-overlapping or no-op*/
        !            78:        else if (from > to)
        !            79:                bcopy(from, to, bytes); /* overlapping but OK */
        !            80:        else {
        !            81:                /* to > from: overlapping, and must copy right-to-left. */
        !            82:                from += bytes - 1;
        !            83:                to += bytes - 1;
        !            84:                while (bytes-- > 0)
        !            85:                        *to-- = *from--;
        !            86:        }
        !            87: }
        !            88: 
        !            89: int bcmp(
        !            90:        const char      *a,
        !            91:        const char      *b,
        !            92:        vm_size_t       len)
        !            93: {
        !            94:        if (len == 0)
        !            95:                return 0;
        !            96: 
        !            97:        do
        !            98:                if (*a++ != *b++)
        !            99:                        break;
        !           100:        while (--len);
        !           101: 
        !           102:        return len;
        !           103: }
        !           104: 
        !           105: #if    MACH_ASSERT
        !           106: 
        !           107: /*
        !           108:  * Machine-dependent routine to fill in an array with up to callstack_max
        !           109:  * levels of return pc information.
        !           110:  */
        !           111: void machine_callstack(
        !           112:        natural_t       *buf,
        !           113:        vm_size_t       callstack_max)
        !           114: {
        !           115: }
        !           116: 
        !           117: #endif /* MACH_ASSERT */

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