diff --git a/src/guf_sort.h b/src/guf_sort.h
index 495d089..29db5ed 100644
--- a/src/guf_sort.h
+++ b/src/guf_sort.h
@@ -11,8 +11,8 @@ typedef enum guf_sort_opt {
 
 #ifdef GUF_T
 
-#ifndef GUF_T_NAME
-    #define GUF_T_NAME GUF_T
+#ifndef GUF_FN_NAME_PREFIX
+    #define GUF_FN_NAME_PREFIX GUF_CAT(GUF_T, _arr)
 #endif
 
 #ifdef GUF_IMPL_STATIC
@@ -21,9 +21,11 @@ typedef enum guf_sort_opt {
     #define GUF_FN_KEYWORDS
 #endif
 
-GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_T_NAME, _insertion_sort)(GUF_T *arr, ptrdiff_t n, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b));
-GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_T_NAME, _merge_sort)(GUF_T *restrict arr, GUF_T *restrict arr_tmp, ptrdiff_t n, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b));
-GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_T_NAME, _qsort)(GUF_T *arr, ptrdiff_t n, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b));
+GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_FN_NAME_PREFIX, _insertion_sort)(GUF_T *arr, ptrdiff_t n, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b));
+GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_FN_NAME_PREFIX, _merge_sort)(GUF_T *restrict arr, GUF_T *restrict arr_tmp, ptrdiff_t n, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b));
+GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_FN_NAME_PREFIX, _qsort)(GUF_T *arr, ptrdiff_t n, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b));
+
+GUF_FN_KEYWORDS bool GUF_CAT(GUF_FN_NAME_PREFIX, _is_sorted)(GUF_T *arr, ptrdiff_t n, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b));
 
 #if defined(GUF_IMPL) || defined(GUF_IMPL_STATIC) 
 
@@ -36,7 +38,7 @@ GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_T_NAME, _qsort)(GUF_T *arr, ptrdiff_t n, guf_
     - time: worst O(n^2); average O(n^2); best O(n) (if arr is already sorted)
     - space: O(1)
 */
-GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_T_NAME, _insertion_sort)(GUF_T *arr, ptrdiff_t n, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b))
+GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_FN_NAME_PREFIX, _insertion_sort)(GUF_T *arr, ptrdiff_t n, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b))
 {
     GUF_ASSERT_RELEASE(arr);
     GUF_ASSERT_RELEASE(n >= 0);
@@ -57,7 +59,7 @@ GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_T_NAME, _insertion_sort)(GUF_T *arr, ptrdiff_
     - time: O(n * log n) (worst, average, and best)
     - space: always O(n) (for arr_tmp, allocated and freed by the caller)
 */ 
-GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_T_NAME, _merge_sort)(GUF_T *restrict arr, GUF_T *restrict arr_tmp, ptrdiff_t n, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b))
+GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_FN_NAME_PREFIX, _merge_sort)(GUF_T *restrict arr, GUF_T *restrict arr_tmp, ptrdiff_t n, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b))
 {
     GUF_ASSERT_RELEASE(arr);
     GUF_ASSERT_RELEASE(n >= 0);
@@ -98,7 +100,7 @@ GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_T_NAME, _merge_sort)(GUF_T *restrict arr, GUF
     - time: worst O(n^2); average O(n * log n); best O(n * log n)
     - space: worst O(log n) (stack space used for the recursive function calls)
 */
-static GUF_T *GUF_CAT(GUF_T_NAME, _qsort_range)(GUF_T *arr, ptrdiff_t first_idx, ptrdiff_t last_idx, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b))
+static GUF_T *GUF_CAT(GUF_FN_NAME_PREFIX, _qsort_range)(GUF_T *arr, ptrdiff_t first_idx, ptrdiff_t last_idx, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b))
 {
     GUF_ASSERT(arr);
     GUF_ASSERT(sort_opt == GUF_SORT_ASCENDING || sort_opt == GUF_SORT_DESCENDING);
@@ -138,17 +140,17 @@ static GUF_T *GUF_CAT(GUF_T_NAME, _qsort_range)(GUF_T *arr, ptrdiff_t first_idx,
             (Solution to exercise "II.7.4c. Stack depth for quicksort". In "Introduction to Algorithms" (3rd ed, p. 188))
         */
         if (pivot_idx <= mid_idx) { // a.) Left subarray is smaller or equal than the right subarray -> recur into the smaller left subarray first.
-            GUF_CAT(GUF_T_NAME, _qsort_range)(arr, first_idx, pivot_idx - 1, sort_opt, cmp); 
+            GUF_CAT(GUF_FN_NAME_PREFIX, _qsort_range)(arr, first_idx, pivot_idx - 1, sort_opt, cmp); 
             first_idx = pivot_idx + 1;
         } else { // b.) Right subarray is smaller than the left subarray -> recur into the smaller right subarray first.
-            GUF_CAT(GUF_T_NAME, _qsort_range)(arr, pivot_idx + 1, last_idx, sort_opt, cmp); 
+            GUF_CAT(GUF_FN_NAME_PREFIX, _qsort_range)(arr, pivot_idx + 1, last_idx, sort_opt, cmp); 
             last_idx = pivot_idx - 1;
         }
     }
     return arr;
 }
 
-GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_T_NAME, _qsort)(GUF_T *arr, ptrdiff_t n, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b))
+GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_FN_NAME_PREFIX, _qsort)(GUF_T *arr, ptrdiff_t n, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b))
 {
     GUF_ASSERT_RELEASE(arr);
     GUF_ASSERT_RELEASE(sort_opt == GUF_SORT_ASCENDING || sort_opt == GUF_SORT_DESCENDING);
@@ -156,20 +158,31 @@ GUF_FN_KEYWORDS GUF_T *GUF_CAT(GUF_T_NAME, _qsort)(GUF_T *arr, ptrdiff_t n, guf_
     if (n <= 1) {
         return arr;
     } else if (n <= 4) {
-        return GUF_CAT(GUF_T_NAME, _insertion_sort)(arr, n, sort_opt, cmp);
+        return GUF_CAT(GUF_FN_NAME_PREFIX, _insertion_sort)(arr, n, sort_opt, cmp);
     } else {
-        return GUF_CAT(GUF_T_NAME, _qsort_range)(arr, 0, n - 1, sort_opt, cmp);
+        return GUF_CAT(GUF_FN_NAME_PREFIX, _qsort_range)(arr, 0, n - 1, sort_opt, cmp);
     }
 }
 
+GUF_FN_KEYWORDS bool GUF_CAT(GUF_FN_NAME_PREFIX, _is_sorted)(GUF_T *arr, ptrdiff_t n, guf_sort_opt sort_opt, int(*cmp)(const GUF_T *a, const GUF_T *b))
+{
+    GUF_ASSERT_RELEASE(arr);
+    for (ptrdiff_t i = 0; i < n - 1; ++i) {
+        if (!guf_before_or_equal(arr + i, arr + (i+1))) {
+            return false;
+        }
+    }
+    return true;
+}
+
 #undef guf_before
 #undef guf_before_or_equal
-#endif /* end #ifdef GUF_IMPL */
-
-#undef GUF_T
-#undef GUF_T_NAME
-#endif /* end  #ifdef GUF_T */
 
 #undef GUF_IMPL
 #undef GUF_IMPL_STATIC
 #undef GUF_FN_KEYWORDS
+#endif /* end #ifdef GUF_IMPL */
+
+#undef GUF_T
+#undef GUF_FN_NAME_PREFIX
+#endif /* end  #ifdef GUF_T */
diff --git a/src/guf_test.c b/src/guf_test.c
index 1c1faae..b7d1800 100644
--- a/src/guf_test.c
+++ b/src/guf_test.c
@@ -53,11 +53,12 @@ int main(void)
         }
 
         // float *tmp = test_allocator.alloc(floats.size * sizeof(float), &test_allocator_ctx);
-        // float *res = float_merge_sort(floats.data, tmp, floats.size, GUF_SORT_ASCENDING, NULL);
+        // float *res = float_arr_merge_sort(floats.data, tmp, floats.size, GUF_SORT_ASCENDING, NULL);
         // test_allocator.free(tmp, floats.size * sizeof(float), &test_allocator_ctx);
         // GUF_ASSERT_RELEASE(res == floats.data);
 
-        float_qsort(floats.data, floats.size, GUF_SORT_ASCENDING, NULL);
+        float_arr_qsort(floats.data, floats.size, GUF_SORT_ASCENDING, NULL);
+        GUF_ASSERT_RELEASE(float_arr_is_sorted(floats.data, floats.size, GUF_SORT_ASCENDING, NULL));
     
         GUF_CNT_FOREACH(&floats, dbuf_float, it) {
             printf("float: %f\n", (double)*it.ptr);
diff --git a/src/guf_utils.h b/src/guf_utils.h
index 71edee2..b13fc47 100644
--- a/src/guf_utils.h
+++ b/src/guf_utils.h
@@ -1,7 +1,7 @@
 #ifndef GUF_UTILS_H
 #define GUF_UTILS_H
 
-static inline bool guf_is_big_endian(void)
+static inline bool guf_system_is_big_endian(void)
 {
     unsigned i = 1;
     const char *bytes = (const char*)&i;