+
+int
+strcmp_null (const char *s1, const char *s2)
+{
+ if (s1 && s2)
+ return strcmp (s1, s2);
+ else if (! s1 && ! s2)
+ return 0;
+ else if (s1)
+ return 1; /* s1 (non-NULL) is greater than s2 (NULL) */
+ else
+ return -1; /* s1 (NULL) is less than s2 (non-NULL) */
+}
+
+int
+strcase_equal (const void *a, const void *b)
+{
+ return strcasecmp (a, b) == 0;
+}
+
+unsigned int
+strcase_hash (const void *ptr)
+{
+ const char *s = ptr;
+
+ /* This is the djb2 hash. */
+ unsigned int hash = 5381;
+ while (s && *s) {
+ hash = ((hash << 5) + hash) + tolower (*s);
+ s++;
+ }
+
+ return hash;
+}
+
+void
+strip_trailing (char *str, char ch)
+{
+ int i;
+
+ for (i = strlen (str) - 1; i >= 0; i--) {
+ if (str[i] == ch)
+ str[i] = '\0';
+ else
+ break;
+ }
+}