1 files changed, 33 insertions, 0 deletions
diff --git a/system/libraries/format/size.zig b/system/libraries/format/size.zig
new file mode 100644
index 0000000..a38c0c8
--- /dev/null
+++ b/system/libraries/format/size.zig
@@ -0,0 +1,33 @@
+//! Size formatting
+
+const int = @import("int.zig");
+
+const KB: u64 = 1024;
+const MB: u64 = 1024 * 1024;
+const GB: u64 = 1024 * 1024 * 1024;
+
+pub fn format(bytes: u64, buf: []u8) []u8 {
+    if (bytes < KB) {
+        const s = int.toStr(bytes, buf);
+        buf[s.len] = 'B';
+        return buf[0 .. s.len + 1];
+    } else if (bytes < MB) {
+        const kb = bytes / KB;
+        const s = int.toStr(kb, buf);
+        buf[s.len] = 'K';
+        buf[s.len + 1] = 'B';
+        return buf[0 .. s.len + 2];
+    } else if (bytes < GB) {
+        const mb = bytes / MB;
+        const s = int.toStr(mb, buf);
+        buf[s.len] = 'M';
+        buf[s.len + 1] = 'B';
+        return buf[0 .. s.len + 2];
+    } else {
+        const gb = bytes / GB;
+        const s = int.toStr(gb, buf);
+        buf[s.len] = 'G';
+        buf[s.len + 1] = 'B';
+        return buf[0 .. s.len + 2];
+    }
+}