More like lib/libc/stdio/mktemp.c

Author: tschaub

lib/binding.js

@@ -711,13 +711,13 @@ Binding.prototype.rmdir = function(pathname, callback) {
 };
 
 
-var letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
-// see https://github.com/joyent/libuv/pull/1368/files#diff-aa0127b468d5b4716e070fce75ecdc54R725
+var PATH_CHARS = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
 
-var attempts = 62 * 62 * 62;
+var MAX_ATTEMPTS = 62 * 62 * 62;
 
 /**
- * Create a directory.
+ * Create a directory based on a template.
+ * See http://web.mit.edu/freebsd/head/lib/libc/stdio/mktemp.c
  * @param {string} template Path template (trailing Xs will be replaced).
  * @param {string} encoding The encoding ('utf-8' or 'buffer').
  * @param {function(Error, string)} callback Optional callback.
@@ -742,11 +742,11 @@ Binding.prototype.mkdtemp = function(prefix, encoding, callback) {
     var unique = false;
     var count = 0;
     var name;
-    while (!unique && count < attempts) {
+    while (!unique && count < MAX_ATTEMPTS) {
       var position = template.length - 1;
       var replacement = '';
       while (template.charAt(position) === 'X') {
-        replacement += letters.charAt(Math.floor(letters.length * Math.random()));
+        replacement += PATH_CHARS.charAt(Math.floor(PATH_CHARS.length * Math.random()));
         position -= 1;
       }
       var candidate = template.slice(0, position + 1) + replacement;
@@ -757,7 +757,7 @@ Binding.prototype.mkdtemp = function(prefix, encoding, callback) {
       count += 1;
     }
     if (!name) {
-      throw new Error('Failed to find a unique name in ' + attempts + ' attempts');
+      throw new FSError('EEXIST', prefix);
     }
     var dir = new Directory();
     parent.addItem(name, dir);