Cleanup statistics print out

 - Give a rounded input/output byte count.
 - Seperate groups by new lines.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 38 insertions, 0 deletions

diff --git a/lib/common/print_size.c b/lib/common/print_size.c
new file mode 100644
index 0000000..6e76805
--- /dev/null
+++ b/lib/common/print_size.c
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * print_size.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "common.h"
+
+void print_size(sqfs_u64 size, char *buffer, bool round_to_int)
+{
+	static const char *fractions = "0112334456678899";
+	static const char *suffices = "kMGTPEZY";
+	unsigned int fraction;
+	int suffix = -1;
+
+	while (size > 1024) {
+		++suffix;
+		fraction = size % 1024;
+		size /= 1024;
+	}
+
+	if (suffix >= 0) {
+		fraction /= 64;
+
+		if (round_to_int) {
+			size = fraction >= 8 ? (size + 1) : size;
+
+			sprintf(buffer, "%u%c", (unsigned int)size,
+				suffices[suffix]);
+		} else {
+			sprintf(buffer, "%u.%c%c", (unsigned int)size,
+				fractions[fraction], suffices[suffix]);
+		}
+	} else {
+		sprintf(buffer, "%u", (unsigned int)size);
+	}
+}