-char *bmstrcasestr(char *text, char *pattern);
-char *bmstrcasestr_len(char *text, size_t textlen, char *pattern, size_t patlen);
+char *bmstrcasestr(char *text, const char *pattern);
+char *bmstrcasestr_len(char *text, size_t textlen, const char *pattern, size_t patlen);
+const char *cbmstrcasestr(const char *text, const char *pattern);
+const char *cbmstrcasestr_len(const char *text, size_t textlen, const char *pattern, size_t patlen);