refactor(test): use common.h types and nullptr

lib/common.c

@@ -29,7 +29,7 @@ void *
 srealloc (void *ptr, usize size)
 {
 #if __STDC_VERSION__ >= 202000L // C23 or above
-    if (ptr == NULL)
+    if (ptr == nullptr)
         return smalloc (size);
 #endif
 

lib/debug.c

@@ -11,7 +11,7 @@
  * @param   file: the file in which malloc() was called
  * @param   line: the source code line where malloc() was called
  *
- * @return  the pointer to the allocated memory, or NULL in case of error
+ * @return  the pointer to the allocated memory, or nullptr in case of error
  *
  * @errno   see malloc(3)
  *
@@ -47,7 +47,7 @@ debug_malloc (usize size, const char *file, usize line)
  * @param   file: the file in which realloc() was called
  * @param   line: the source code line where realloc() was called
  *
- * @return  the pointer to the reallocated memory, or NULL in case of error
+ * @return  the pointer to the reallocated memory, or nullptr in case of error
  *
  * @errno   see realloc(3)
  *
@@ -109,7 +109,7 @@ debug_free (void *ptr, const char *file, usize line)
  * @param   file: the file in which malloc() was called
  * @param   line: the source code line where malloc() was called
  *
- * @return  the pointer to the allocated memory, or NULL in case of error
+ * @return  the pointer to the allocated memory, or nullptr in case of error
  *
  * @usage   the header `debug.h` defines a macro `smalloc(size)` that
  *          automatically inserts filename and line.
@@ -135,7 +135,7 @@ debug_smalloc (usize size, const char *file, usize line)
  * @param   file: the file in which realloc() was called
  * @param   line: the source code line where realloc() was called
  *
- * @return  the pointer to the reallocated memory, or NULL in case of error
+ * @return  the pointer to the reallocated memory, or nullptr in case of error
  *
  * @usage   the header `debug.h` defines a macro `srealloc(ptr, size)` that
  *          automatically inserts filename and line.

lib/str.c

@@ -240,7 +240,7 @@ str_ends_with_len (const str_t str[static 1], usize len,
  * @param   str: the str_t string to search in
  * @param   find: the cstring to search for
  *
- * @return  beginning of found substring as pointer, or NULL if not found
+ * @return  beginning of found substring as pointer, or nullptr if not found
  */
 inline char *
 str_find (const str_t str[static 1], const char *find)

lib/test.c

@@ -18,7 +18,7 @@ test_suite_new (void)
 
     suite = (test_suite_t) {0};
     suite.entries = smalloc ((sizeof *(suite.entries)) * TEST_GROUP_ENTRIES_ALLOC);
-    suite.entries[0] = NULL;
+    suite.entries[0] = nullptr;
     suite.entries_cap = TEST_GROUP_ENTRIES_ALLOC;
 
     return suite;
@@ -51,7 +51,7 @@ test_suite_add (test_suite_t suite[static 1], test_entry_func_t func)
     }
     suite->entries[suite->entries_len] = func;
     suite->entries_len += 1;
-    suite->entries[suite->entries_len] = NULL;
+    suite->entries[suite->entries_len] = nullptr;
 }
 
 /**

test/main.c

@@ -15,7 +15,7 @@ test_results_t
 test_cstr (void)
 {
     test_group_t group;
-    size_t len;
+    usize len;
 
     group = test_group_new ();
 
@@ -62,7 +62,7 @@ test_str (void)
     group = test_group_new ();
 
     str = str_new ();
-    test_add (&group, test_assert (str.str != NULL && str.cap > 0), "str_new");
+    test_add (&group, test_assert (str.str != nullptr && str.cap > 0), "str_new");
     str_free (&str);
 
     str = str_new_cap (1000);
@@ -97,7 +97,7 @@ test_str (void)
     test_add (&group, test_assert (!str_ends_with (&str, "bar")), "str_ends_with false");
 
     test_add (&group, test_assert (str_find (&str, "ipsum") == str.str + 6), "str_find success");
-    test_add (&group, test_assert (str_find (&str, "foo") == NULL), "str_find failure");
+    test_add (&group, test_assert (str_find (&str, "foo") == nullptr), "str_find failure");
     test_add (&group, test_assert (str_pos (&str, "ipsum") == 6), "str_pos success");
     test_add (&group, test_assert (str_pos (&str, "foo") == -1), "str_pos failure");
     str_free (&str);