wrap print progress in pprint

src/pprint.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <pthread.h>
+
+static int pprint_level = 1;
+/* level 1: print progress bar only.
+ * level 2: print copy start/done messages.
+ * level 3: print ssh connection establishment/disconnection.
+ * level 4: print chunk information.
+ */
+
+static pthread_mutex_t pprint_lock = PTHREAD_MUTEX_INITIALIZER;
+
+void pprint_set_level(int level)
+{
+        pprint_level = level;
+}
+
+void pprint(int level, const char *fmt, ...)
+{
+        va_list va;
+
+        if (level <= pprint_level) {
+                pthread_mutex_lock(&pprint_lock);
+                va_start(va, fmt);
+                vfprintf(stdout, fmt, va);
+                fflush(stdout);
+                va_end(va);
+                pthread_mutex_unlock(&pprint_lock);
+        }
+}
+