Add UtilSleepMillis() function.

src/Util.c

@@ -105,3 +105,17 @@ UtilStringDuplicate(char *inStr)
 
     return outStr;
 }
+
+int
+UtilSleepMillis(long ms)
+{
+    struct timespec ts;
+    int res;
+
+    ts.tv_sec = ms / 1000;
+    ts.tv_nsec = (ms % 1000) * 1000000;
+
+    res = nanosleep(&ts, &ts);
+
+    return res;
+}

src/include/Util.h

@@ -84,4 +84,16 @@ extern char *
 extern char *
  UtilStringDuplicate(char *);
 
+/*
+ * Sleep for the given number of milliseconds. This is a simple wrapper
+ * for nanosleep() that makes its usage much easier.
+ *
+ * Params:
+ *   (long) The number of milliseconds to sleep for.
+ *
+ * Return: The result of nanosleep().
+ */
+extern int
+ UtilSleepMillis(long);
+
 #endif                             /* TELODENDRIA_UTIL_H */