gen/NSSystemDirectories.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 #import <libc.h>
  24 #import <stdio.h>
  25 #import <stdlib.h>
  26 #import <NSSystemDirectories.h>
  27
  28 // Names of directories; index into this with NSSearchPathDirectory - 1
  29 #define numDirs 10
  30 static const struct {
  31     unsigned char invalidDomainMask;    // Domains in which this dir does not appear
  32     unsigned char alternateDomainMask;  // Domains in which this dir uses the alternate domain path
  33     const char *dirPath;
  34 } dirInfo[numDirs] = {
  35     {0,   0,   "Applications"},
  36     {0,   0,   "Applications/GrabBag"},
  37     {0,   0,   "Developer/Applications"},
  38     {0,   0,   "Applications/Utilities"},
  39     {0,   0x8, "Library"},                      // Uses alternate form in System domain
  40     {0,   0,   "Developer"},
  41     {0x9, 0,   "Users"},                        // Not valid in the System and User domains
  42     {0,   0x8, "Library/Documentation"},        // Uses alternate form in System domain
  43     {0xe, 0,   "Documents"},                    // Only valid in user domain
  44     {0x7, 0,   "Library/CoreServices"}          // Only valid in System domain
  45 };
  46
  47 // Ordered list of where to find applications in each domain (the numbers are NSSearchPathDirectory)
  48 #define numApplicationDirs 4
  49 static const char applicationDirs[numApplicationDirs] = {1, 4, 3, 2};
  50
  51 // Ordered list of where to find resources in each domain (the numbers are NSSearchPathDirectory)
  52 #define numLibraryDirs 2
  53 static const char libraryDirs[numLibraryDirs] = {5, 6};
  54
  55 // Names of domains; index into this log2(domainMask). If the search path ordering is ever changed, then we need an indirection (as the domainMask values cannot be changed).
  56 #define numDomains 4
  57 static const struct {
  58     char needsRootPrepended;
  59     const char *domainPath;
  60     const char *alternateDomainPath;
  61 } domainInfo[numDomains] = {
  62     {0, "~",        "~"},
  63     {1, "",         ""},
  64     {1, "/Network", "/Network"},
  65     {1, "",         "/System"}
  66 };
  67
  68 #define invalidDomains 0x00     // some domains may be invalid on non-Mach systems
  69
  70 NSSearchPathEnumerationState NSStartSearchPathEnumeration(NSSearchPathDirectory dir, NSSearchPathDomainMask domainMask) {
  71     // The state is AABBCCCC, where
  72     // AA is the dir(s) requested
  73     // BB is the current state of dirs (if AA < 100, then this is always 0; otherwise it goes up to number of dirs)
  74     // CCCC is the domains requested
  75     // the state always contains the next item; if CCCC is 0, then we're done
  76     domainMask = domainMask & ((1 << numDomains) - 1) & ~invalidDomains;        // Just leave useful bits in there
  77     if (dir != NSAllLibrariesDirectory && dir != NSLibraryDirectory && dir != NSUserDirectory && dir != NSDocumentationDirectory && (domainMask & NSLocalDomainMask) && (domainMask & NSSystemDomainMask)) domainMask = domainMask & ~NSSystemDomainMask;       // Hack to avoid duplication
  78     return (((unsigned int)dir) << 24) + ((unsigned int)domainMask);
  79 }
  80
  81 NSSearchPathEnumerationState NSGetNextSearchPathEnumeration(NSSearchPathEnumerationState state, char *path) {
  82     static const char *nextRoot = NULL;
  83     unsigned dir = (state >> 24) & 0xff;
  84     unsigned dirState = (state >> 16) & 0xff;
  85     unsigned domainMask = state & 0xffff;
  86     unsigned int curDomain;     // The current domain we're at...
  87     unsigned int curDir = 0;    // The current dir...
  88
  89     do {
  90         if (domainMask == 0) return 0; // Looks like we're done
  91         for (curDomain = 0; curDomain < numDomains; curDomain++) if ((domainMask & (1 << curDomain))) break;
  92
  93         // Determine directory
  94         if (dir < NSAllApplicationsDirectory) { // One directory per domain, simple...
  95             curDir = dir;
  96         } else {                                        // Can return multiple directories for each domain
  97             if (dir == NSAllApplicationsDirectory) {
  98                 curDir = applicationDirs[dirState];
  99                 if (++dirState == numApplicationDirs) dirState = 0;
 100             } else if (dir == NSAllLibrariesDirectory) {
 101                 curDir = libraryDirs[dirState];
 102                 if (++dirState == numLibraryDirs) dirState = 0;
 103             }
 104         }
 105         if (dirState == 0) domainMask &= ~(1 << curDomain);     // If necessary, jump to next domain
 106     } while ((dirInfo[curDir - 1].invalidDomainMask & (1 << curDomain)));       // If invalid, try again...
 107
 108     // Get NEXT_ROOT, if necessary.
 109     if (domainInfo[curDomain].needsRootPrepended && nextRoot == 0) {
 110         nextRoot = getenv("NEXT_ROOT");
 111         if (nextRoot == NULL) {
 112             nextRoot = "";
 113         } else {
 114             strcpy(malloc(strlen(nextRoot) + 1), nextRoot);    // Be safe...
 115         }
 116     }
 117
 118     snprintf(path, PATH_MAX, "%s%s/%s", domainInfo[curDomain].needsRootPrepended ? nextRoot : "", (dirInfo[curDir - 1].alternateDomainMask & (1 << curDomain)) ? domainInfo[curDomain].alternateDomainPath : domainInfo[curDomain].domainPath, dirInfo[curDir - 1].dirPath);
 119
 120     return (dir << 24) + (dirState << 16) + domainMask;
 121 }
 122
 123