Add iOS support

ios.h

@@ -0,0 +1,42 @@
+//
+//  ios.h
+//  DateTimeLib
+//
+// The MIT License (MIT)
+//
+// Copyright (c) 2016 Alexander Kormanovsky
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#ifndef ios_hpp
+#define ios_hpp
+
+#include <string>
+
+namespace date
+{
+namespace iOSUtils
+{
+    
+std::string get_tzdata_path();
+    
+}  // namespace iOSUtils
+}  // namespace date
+
+#endif // ios_hpp

ios.mm

@@ -0,0 +1,90 @@
+//
+//  ios.cpp
+//  DateTimeLib
+//
+// The MIT License (MIT)
+//
+// Copyright (c) 2016 Alexander Kormanovsky
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#if HAS_IOS
+
+#include "ios.h"
+#include "NVHTarGzip.h"
+
+namespace date
+{
+namespace iOSUtils
+{
+    
+std::string
+get_tzdata_path()
+{
+    static NSString *result = @"";
+    NSFileManager *manager = [NSFileManager defaultManager];
+    static dispatch_once_t onceToken;
+    
+    dispatch_once(&onceToken,
+    ^{
+        NSArray *paths = [NSBundle pathsForResourcesOfType:@"tar.gz"
+                                          inDirectory:[[NSBundle mainBundle] bundlePath]];
+        
+        if (paths.count != 0)
+        {
+            NSString *archivePath = paths[0];
+            NSURL *docsURL = [[[NSFileManager defaultManager]
+                               URLsForDirectory:NSDocumentDirectory
+                               inDomains:NSUserDomainMask] lastObject];
+            
+            NSString *path = [[docsURL URLByAppendingPathComponent:@"tzdata"] path];
+            
+            if ([manager fileExistsAtPath:path])
+            {
+                result = path;
+                return;
+            }
+            
+            [manager createDirectoryAtPath:path withIntermediateDirectories:NO
+                     attributes:nil error:nil];
+            
+            NSError *error;
+            
+            [[NVHTarGzip sharedInstance] unTarGzipFileAtPath:archivePath
+                                         toPath:path error:&error];
+            
+            if (error != nil)
+            {
+                NSLog(@"%s Error extracting %@", __func__, error);
+            }
+            else
+            {
+                result = path;
+            }
+            
+        }
+    });
+    
+    return [result UTF8String];
+}
+
+}  // namespace iOSUtils
+}  // namespace date
+
+#endif

tz.cpp

@@ -2,6 +2,7 @@
 //
 // Copyright (c) 2015, 2016 Howard Hinnant
 // Copyright (c) 2015 Ville Voutilainen
+// Copyright (c) 2016 Alexander Kormanovsky
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
@@ -116,6 +117,10 @@
 #  endif //!USE_SHELL_API
 #endif  // !WIN32
 
+#ifdef HAS_IOS
+#include "ios.h"
+#endif
+
 #if HAS_REMOTE_API
 // Note curl includes windows.h so we must include curl AFTER definitions of things
 // that effect windows.h such as NOMINMAX.
@@ -179,12 +184,16 @@ static
 std::string
 expand_path(std::string path)
 {
+#ifndef HAS_IOS
     ::wordexp_t w{};
     ::wordexp(path.c_str(), &w, 0);
     assert(w.we_wordc == 1);
     path = w.we_wordv[0];
     ::wordfree(&w);
     return path;
+#else
+    return date::iOSUtils::get_tzdata_path();
+#endif
 }
 
 #endif  // !_WIN32