Add Directory.systemTemp getter to replace createSystemTemp().

runtime/bin/directory_linux.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include "bin/directory.h"
 
 #include <dirent.h>  // NOLINT
@@ skipping 355 matching lines @@
   // process umask.
   int result = TEMP_FAILURE_RETRY(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);
 }
 
 
-char* Directory::CreateTemp(const char* const_template, bool system) {
-  // Returns a new, unused directory name, modifying the contents of
-  // dir_template.  Creates the directory with the permissions specified
+char* Directory::SystemTemp() {
+  const char* temp_dir = getenv("TMPDIR");
+  if (temp_dir == NULL) {
+    temp_dir = getenv("TMP");
+  }
+  if (temp_dir == NULL) {
+    temp_dir = "/tmp";
+  }
+  int length = strnlen(temp_dir, PATH_MAX);
+  char* result = static_cast<char*>(malloc(length + 1));
+  strncpy(result, temp_dir, length);
+  result[length] = '\0';
+  return result;
+}
+
+char* Directory::CreateTemp(const char* prefix) {
+  // 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 must be freed by the caller.
   PathBuffer path;
-  if (system) {
-    const char* temp_dir = getenv("TMPDIR");
-    if (temp_dir == NULL) {
-      temp_dir = getenv("TMP");
-    }
-    if (temp_dir != NULL) {
-      path.Add(temp_dir);
-      if (temp_dir[strlen(temp_dir) - 1] != '/') {
-        path.Add("/");
-      }
-    } else {
-      path.Add("/tmp/");
-    }
-  }
-  path.Add(const_template);
+  path.Add(prefix);
   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;
@@ skipping 26 matching lines @@
 bool Directory::Rename(const char* path, const char* new_path) {
   ExistsResult exists = Exists(path);
   if (exists != EXISTS) return false;
   return (TEMP_FAILURE_RETRY(rename(path, new_path)) == 0);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)