[fuchsia] Some directory operations

runtime/bin/directory_fuchsia.cc

Index: runtime/bin/directory_fuchsia.cc
diff --git a/runtime/bin/directory_fuchsia.cc b/runtime/bin/directory_fuchsia.cc
index 1e374d1617e5189f5bf0377d9dd3013bfd61bcd2..1593ff717244ac0ee173a7ae5cd3a89cbced5ca1 100644
--- a/runtime/bin/directory_fuchsia.cc
+++ b/runtime/bin/directory_fuchsia.cc
@@ -143,38 +143,89 @@ const char* Directory::Current() {
 
 
 bool Directory::SetCurrent(const char* path) {
-  UNIMPLEMENTED();
-  return false;
+  return (NO_RETRY_EXPECTED(chdir(path)) == 0);
 }
 
 
 bool Directory::Create(const char* dir_name) {
-  UNIMPLEMENTED();
-  return false;
+  // Create the directory with the permissions specified by the
+  // process umask.
+  int result = NO_RETRY_EXPECTED(mkdir(dir_name, 0777));
+  // If the directory already exists, treat it as a success.
+  if ((result == -1) && (errno == EEXIST)) {
+    return (Exists(dir_name) == EXISTS);
+  }
+  return (result == 0);
 }
 
 
 const char* Directory::SystemTemp() {
-  UNIMPLEMENTED();
-  return NULL;
+  PathBuffer path;
+  const char* temp_dir = getenv("TMPDIR");
+  if (temp_dir == NULL) {
+    temp_dir = getenv("TMP");
+  }
+  if (temp_dir == NULL) {
+    temp_dir = "/tmp";
+  }
+  if (!path.Add(temp_dir)) {
+    return NULL;
+  }
+
+  // Remove any trailing slash.
+  char* result = path.AsString();
+  int length = strlen(result);
+  if ((length > 1) && (result[length - 1] == '/')) {
+    result[length - 1] = '\0';
+  }
+  return path.AsScopedString();
 }
 
 
 const char* Directory::CreateTemp(const char* prefix) {
-  UNIMPLEMENTED();
-  return NULL;
+  // Returns a new, unused directory name, adding characters to the end
+  // of prefix.  Creates the directory with the permissions specified
+  // by the process umask.
+  // The return value is Dart_ScopeAllocated.
+  PathBuffer path;
+  if (!path.Add(prefix)) {
+    return NULL;
+  }
+  if (!path.Add("XXXXXX")) {
+    // Pattern has overflowed.
+    return NULL;
+  }
+  char* result;
+  do {
+    result = mkdtemp(path.AsString());
+  } while ((result == NULL) && (errno == EINTR));
+  if (result == NULL) {
+    return NULL;
+  }
+  return path.AsScopedString();
 }
 
 
 bool Directory::Delete(const char* dir_name, bool recursive) {
-  UNIMPLEMENTED();
-  return false;
+  if (!recursive) {
+    if ((File::GetType(dir_name, false) == File::kIsLink) &&
+        (File::GetType(dir_name, true) == File::kIsDirectory)) {
+      return NO_RETRY_EXPECTED(unlink(dir_name)) == 0;
+    }
+    return NO_RETRY_EXPECTED(rmdir(dir_name)) == 0;
+  } else {
+    UNIMPLEMENTED();
+    return false;
+  }
 }
 
 
 bool Directory::Rename(const char* path, const char* new_path) {
-  UNIMPLEMENTED();
-  return false;
+  ExistsResult exists = Exists(path);
+  if (exists != EXISTS) {
+    return false;
+  }
+  return (NO_RETRY_EXPECTED(rename(path, new_path)) == 0);
 }
 
 }  // namespace bin