Improve extract_urls

src/menu.c

@@ -63,41 +63,32 @@ void regex_teardown(void)
         }
 }
 
-/*
+/* see menu.h */
- * Extract all urls from a given string.
- *
- * Return: a string of urls separated by \n
- *
- */
 char *extract_urls(const char *to_match)
 {
-        char *urls = NULL;
+        if (!to_match)
+                return NULL;
 
         if (!regex_init())
                 return NULL;
 
+        char *urls = NULL;
         const char *p = to_match;
         regmatch_t m;
 
         while (1) {
                 int nomatch = regexec(&url_regex, p, 1, &m, 0);
-                if (nomatch) {
+
-                        return urls;
+                if (nomatch || m.rm_so == -1)
-                }
-                int start;
-                int finish;
-                if (m.rm_so == -1) {
                         break;
-                }
+
-                start = m.rm_so + (p - to_match);
+                int start = m.rm_so + (p - to_match);
-                finish = m.rm_eo + (p - to_match);
+                int finish = m.rm_eo + (p - to_match);
 
                 char *match = g_strndup(to_match + start, finish - start);
-
                 urls = string_append(urls, match, "\n");
 
                 g_free(match);
-
                 p += m.rm_eo;
         }
         return urls;

src/menu.h

@@ -2,7 +2,14 @@
 #ifndef DUNST_MENU_H
 #define DUNST_MENU_H
 
+/**
+ * Extract all urls from the given string.
+ *
+ * @param to_match (nullable) String to extract URLs
+ * @return a string of urls separated by '\n'
+ */
 char *extract_urls(const char *to_match);
+
 void open_browser(const char *in);
 void invoke_action(const char *action);
 void regex_teardown(void);

test/menu.c

@@ -8,6 +8,9 @@ TEST test_extract_urls_from_empty_string(void)
 {
         char *urls = extract_urls("");
         ASSERT_EQ_FMT(NULL, (void*)urls, "%p");
+
+        urls = extract_urls(NULL);
+        ASSERT_EQ_FMT(NULL, (void*)urls, "%p");
         g_free(urls);
         PASS();
 }