core/MacOSStubs.c

   1 /*
   2  * Copyright (c) 2000-2015 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 #include <sys/param.h>
  29 #include <sys/systm.h>
  30 #include <sys/kernel.h>
  31 #include <sys/malloc.h>
  32 #include <sys/types.h>
  33 #include <pexpert/pexpert.h>
  34 #include <IOKit/IOLib.h>
  35
  36 #include "hfs.h"
  37 #include "hfs_dbg.h"
  38 #include "FileMgrInternal.h"
  39
  40 /*
  41  * gTimeZone should only be used for HFS volumes!
  42  * It is initialized when an HFS volume is mounted.
  43  */
  44 struct timezone gTimeZone = {8*60,1};
  45
  46 /*
  47  * GetTimeUTC - get the GMT Mac OS time (in seconds since 1/1/1904)
  48  *
  49  * called by the Catalog Manager when creating/updating HFS Plus records
  50  */
  51 u_int32_t GetTimeUTC(void)
  52 {
  53         struct timeval tv;
  54
  55         microtime(&tv);
  56
  57         return (tv.tv_sec + MAC_GMT_FACTOR);
  58 }
  59
  60
  61 /*
  62  * LocalToUTC - convert from Mac OS local time to Mac OS GMT time.
  63  * This should only be called for HFS volumes (not for HFS Plus).
  64  */
  65 u_int32_t LocalToUTC(u_int32_t localTime)
  66 {
  67         u_int32_t gtime = localTime;
  68
  69         if (gtime != 0) {
  70                 gtime += (gTimeZone.tz_minuteswest * 60);
  71         /*
  72          * We no longer do DST adjustments here since we don't
  73          * know if time supplied needs adjustment!
  74          *
  75          * if (gTimeZone.tz_dsttime)
  76          *     gtime -= 3600;
  77          */
  78         }
  79     return (gtime);
  80 }
  81
  82 /*
  83  * UTCToLocal - convert from Mac OS GMT time to Mac OS local time.
  84  * This should only be called for HFS volumes (not for HFS Plus).
  85  */
  86 u_int32_t UTCToLocal(u_int32_t utcTime)
  87 {
  88         u_int32_t ltime = utcTime;
  89
  90         if (ltime != 0) {
  91                 ltime -= (gTimeZone.tz_minuteswest * 60);
  92         /*
  93          * We no longer do DST adjustments here since we don't
  94          * know if time supplied needs adjustment!
  95          *
  96          * if (gTimeZone.tz_dsttime)
  97          *     ltime += 3600;
  98          */
  99         }
 100     return (ltime);
 101 }
 102
 103 /*
 104  * to_bsd_time - convert from Mac OS time (seconds since 1/1/1904)
 105  *               to BSD time (seconds since 1/1/1970)
 106  */
 107 time_t to_bsd_time(u_int32_t hfs_time)
 108 {
 109         u_int32_t gmt = hfs_time;
 110
 111         if (gmt > MAC_GMT_FACTOR)
 112                 gmt -= MAC_GMT_FACTOR;
 113         else
 114                 gmt = 0;        /* don't let date go negative! */
 115
 116         return (time_t)gmt;
 117 }
 118
 119 /*
 120  * to_hfs_time - convert from BSD time (seconds since 1/1/1970)
 121  *               to Mac OS time (seconds since 1/1/1904)
 122  */
 123 u_int32_t to_hfs_time(time_t bsd_time)
 124 {
 125         u_int32_t hfs_time = (u_int32_t)bsd_time;
 126
 127         /* don't adjust zero - treat as uninitialzed */
 128         if (hfs_time != 0)
 129                 hfs_time += MAC_GMT_FACTOR;
 130
 131         return (hfs_time);
 132 }
 133
 134 void
 135 DebugStr(
 136         const char * debuggerMsg
 137         )
 138 {
 139     kprintf ("*** Mac OS Debugging Message: %s\n", debuggerMsg);
 140 #if DEBUG
 141         Debugger(debuggerMsg);
 142 #endif
 143 }