sandbox: moved all sources to main kernel tree

util/data_size.c

@@ -0,0 +1,66 @@
+#include <stddef.h>
+#include <stdio.h>
+
+struct magnitude {
+    size_t threshold;
+    const char *suffix;
+};
+
+#define USE_BASE2
+
+/* This list must be in decending order of threshold */
+#ifdef USE_BASE2
+static struct magnitude k_magnitudes[] = {
+    { 0x10000000000, "TiB" },
+    { 0x40000000, "GiB" },
+    { 0x100000, "MiB" },
+    { 0x400, "KiB" },
+    { 0x00, "B" },
+};
+#else
+static struct magnitude k_magnitudes[] = {
+    { 1000000000000, "TB" },
+    { 1000000000, "GB" },
+    { 1000000, "MB" },
+    { 1000, "KB" },
+    { 0, "B" },
+};
+#endif
+
+static void convert(size_t *big, size_t *small, size_t val, size_t threshold)
+{
+    if (!threshold) {
+        *big = val;
+        *small = 0;
+        return;
+    }
+
+    *big = val / threshold;
+    size_t rem = val % threshold;
+    *small = (10 * rem) / threshold;
+}
+
+void data_size_to_string(size_t value, char *out, size_t outsz)
+{
+    if (!value) {
+        snprintf(out, outsz, "0 B");
+        return;
+    }
+
+    size_t def_count = sizeof(k_magnitudes) / sizeof(struct magnitude);
+
+    for (size_t i = 0; i < def_count; i++) {
+        if (value > k_magnitudes[i].threshold) {
+            size_t big, small;
+            convert(&big, &small, value, k_magnitudes[i].threshold);
+            if (small) {
+                snprintf(out, outsz, "%zu.%zu %s", big, small, k_magnitudes[i].suffix);
+            } else {
+                snprintf(out, outsz, "%zu %s", big, k_magnitudes[i].suffix);
+            }
+            return;
+        }
+    }
+
+    *out = 0;
+}