1 files changed, 61 insertions, 0 deletions
diff --git a/outputchannel.c b/outputchannel.c
new file mode 100644
index 0000000..a58c767
--- /dev/null
+++ b/outputchannel.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#include "outputchannel.h"
+#include "qemu-common.h"
+
+struct OutputChannel {
+    void*               opaque;   /* caller-specific information */
+    OutputChannelPrintf printf;   /* callback function to do the printing */
+    unsigned int        written;  /* number of bytes written to the channel */
+};
+
+OutputChannel* output_channel_alloc(void* opaque, OutputChannelPrintf cb)
+{
+    OutputChannel* oc = qemu_mallocz(sizeof(oc));
+    oc->printf  = cb;
+    oc->opaque  = opaque;
+    oc->written = 0;
+
+    return oc;
+}
+
+int output_channel_printf(OutputChannel* oc, const char* fmt, ...)
+{
+    int ret;
+    va_list ap;
+    va_start(ap, fmt);
+    ret = oc->printf(oc->opaque, fmt, ap);
+    va_end(ap);
+
+    /* Don't count errors and no-ops towards number of bytes written */
+    if (ret > 0) {
+        oc->written += ret;
+    }
+
+    return ret;
+}
+
+void output_channel_free(OutputChannel* oc)
+{
+    free(oc);
+}
+
+unsigned int output_channel_written(OutputChannel* oc)
+{
+    return oc->written;
+}