iOS: cd into Documents folder at startup

CQ_INCLUDE_TRYBOTS=skia.primary:Test-iOS-Clang-iPadMini4-GPU-GX6450-arm-Release

Change-Id: I7beadad742bc9444491c7a315a827297a636d70d
Reviewed-on: https://skia-review.googlesource.com/8049
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>

2 files changed, 42 insertions, 0 deletions

diff --git a/tools/ios_utils.h b/tools/ios_utils.h
new file mode 100644
index 0000000000..0287dc14ae
--- /dev/null
+++ b/tools/ios_utils.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef ios_util_DEFINED
+#define ios_util_DEFINED
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+    // cd into the current app's Documents/ directory.
+    // (This is the only directory we can easily read and write.)
+    void cd_Documents();
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif//ios_util_DEFINED
diff --git a/tools/ios_utils.m b/tools/ios_utils.m
new file mode 100644
index 0000000000..b88ab5bfe8
--- /dev/null
+++ b/tools/ios_utils.m
@@ -0,0 +1,19 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#import <Foundation/Foundation.h>
+#include "ios_utils.h"
+#include <unistd.h>
+
+void cd_Documents() {
+    @autoreleasepool {
+        NSURL* dir = [[[NSFileManager defaultManager]
+            URLsForDirectory:NSDocumentDirectory
+                   inDomains:NSUserDomainMask] lastObject];
+        chdir([dir.path UTF8String]);
+    }
+}