am eec69d29: Merge "Fix bug with phantom input windows." into gingerbread

Merge commit 'eec69d2923636b2aaa51df93bacc2b3bbb742736' into gingerbread-plus-aosp

* commit 'eec69d2923636b2aaa51df93bacc2b3bbb742736':
  Fix bug with phantom input windows.

include/utils/String8.h

@@ -171,6 +171,8 @@ public:
             status_t            append(const char* other);
             status_t            append(const char* other, size_t numChars);
 
+            status_t            appendFormat(const char* fmt, ...);
+
             // Note that this function takes O(N) time to calculate the value.
             // No cache value is stored.
             size_t              getUtf32Length() const;

libs/utils/String8.cpp

@@ -372,6 +372,27 @@ status_t String8::append(const char* other, size_t otherLen)
     return real_append(other, otherLen);
 }
 
+status_t String8::appendFormat(const char* fmt, ...)
+{
+    va_list ap;
+    va_start(ap, fmt);
+
+    int result = NO_ERROR;
+    int n = vsnprintf(NULL, 0, fmt, ap);
+    if (n != 0) {
+        size_t oldLength = length();
+        char* buf = lockBuffer(oldLength + n);
+        if (buf) {
+            vsnprintf(buf + oldLength, n + 1, fmt, ap);
+        } else {
+            result = NO_MEMORY;
+        }
+    }
+
+    va_end(ap);
+    return result;
+}
+
 status_t String8::real_append(const char* other, size_t otherLen)
 {
     const size_t myLen = bytes();
@@ -411,15 +432,16 @@ status_t String8::unlockBuffer(size_t size)
     if (size != this->size()) {
         SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
             ->editResize(size+1);
-        if (buf) {
+        if (! buf) {
+            return NO_MEMORY;
+        }
+
         char* str = (char*)buf->data();
         str[size] = 0;
         mString = str;
-            return NO_ERROR;
-        }
     }
 
-    return NO_MEMORY;
+    return NO_ERROR;
 }
 
 ssize_t String8::find(const char* other, size_t start) const