+/* HasPrefix returns true if non-NULL s starts with non-NULL prefix. */
+bool HasPrefix(const char *s, const char *prefix)
+{
+ while (*s && *s == *prefix) {
+ s++;
+ prefix++;
+ }
+
+ return *prefix == '\0';
+}
+
+
+/* HasSuffix returns true if non-NULL s ends with non-NULL suffix. */
+bool HasSuffix(const char *s, const char *suffix)
+{
+ size_t ls, lsuf;
+
+ ls = strlen(s);
+ lsuf = strlen(suffix);
+
+ return lsuf <= ls && !strcmp(s + ls - lsuf, suffix);
+}
+
+
+/* HasSuffixC returns true if non-NULL string s ends with a c before the