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Annotation of XNU/osfmk/i386/loose_ends.c, revision 1.1.1.1

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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