Add new plugin "relay", new function "string_format_size" in plugin API

src/core/wee-string.c

@@ -1244,3 +1244,39 @@ string_iconv_fprintf (FILE *file, const char *data, ...)
     if (buf2)
         free (buf2);
 }
+
+/*
+ * string_format_size: format a string with size and unit name (bytes, KB, MB, GB)
+ *                     note: returned value has to be free() after use
+ */
+
+char *
+string_format_size (unsigned long size)
+{
+    char *unit_name[] = { N_("bytes"), N_("KB"), N_("MB"), N_("GB") };
+    char *unit_format[] = { "%.0f", "%.1f", "%.02f", "%.02f" };
+    float unit_divide[] = { 1, 1024, 1024*1024, 1024*1024*1024 };
+    char format_size[128], str_size[128];
+    int num_unit;
+    
+    str_size[0] = '\0';
+    
+    if (size < 1024*10)
+        num_unit = 0;
+    else if (size < 1024*1024)
+        num_unit = 1;
+    else if (size < 1024*1024*1024)
+        num_unit = 2;
+    else
+        num_unit = 3;
+    
+    snprintf (format_size, sizeof (format_size),
+              "%s %%s",
+              unit_format[num_unit]);
+    snprintf (str_size, sizeof (str_size),
+              format_size,
+              ((float)size) / ((float)(unit_divide[num_unit])),
+              (size <= 1) ? _("byte") : _(unit_name[num_unit]));
+    
+    return strdup (str_size);
+}