Merge branch 'util_format' of git://github.com/exfm/node-browserify i…

…nto exfm-util_format

builtins/util.js

@@ -310,3 +310,37 @@ exports.inherits = function(ctor, superCtor) {
     }
   });
 };
+
+var formatRegExp = /%[sdj%]/g;
+exports.format = function(f) {
+  if (typeof f !== 'string') {
+    var objects = [];
+    for (var i = 0; i < arguments.length; i++) {
+      objects.push(exports.inspect(arguments[i]));
+    }
+    return objects.join(' ');
+  }
+
+  var i = 1;
+  var args = arguments;
+  var len = args.length;
+  var str = String(f).replace(formatRegExp, function(x) {
+    if (x === '%%') return '%';
+    if (i >= len) return x;
+    switch (x) {
+      case '%s': return String(args[i++]);
+      case '%d': return Number(args[i++]);
+      case '%j': return JSON.stringify(args[i++]);
+      default:
+        return x;
+    }
+  });
+  for(var x = args[i]; i < len; x = args[++i]){
+    if (x === null || typeof x !== 'object') {
+      str += ' ' + x;
+    } else {
+      str += ' ' + exports.inspect(x);
+    }
+  }
+  return str;
+};