+ssize_t mutt_pretty_size(char *s, ssize_t len, ssize_t n)
+{
+ if (n == 0)
+ return m_strcpy(s, len, "0K");
+
+ if (n < 10189) /* 0.1K - 9.9K */
+ return snprintf(s, len, "%3.1fK", (n < 103) ? 0.1 : n / 1024.0);
+
+ if (n < 1023949) /* 10K - 999K */
+ /* 51 is magic which causes 10189/10240 to be rounded up to 10 */
+ return snprintf(s, len, "%ldK", (n + 51) / 1024);
+
+ if (n < 10433332) /* 1.0M - 9.9M */
+ return snprintf(s, len, "%3.1fM", n / 1048576.0);
+
+ /* (10433332 + 52428) / 1048576 = 10 */
+ return snprintf (s, len, "%ldM", (n + 52428) / 1048576);
+}