3 files changed, 41 insertions, 15 deletions

diff --git a/source/kit/dynamic_array.c b/source/kit/dynamic_array.c
index 3bda284..1829c45 100644
--- a/source/kit/dynamic_array.c
+++ b/source/kit/dynamic_array.c
@@ -1,9 +1,16 @@
 #include "dynamic_array.h"
 
+#include <assert.h>
 #include <string.h>
 
 void kit_da_init(kit_da_void_t *array, ptrdiff_t element_size,
                  ptrdiff_t size, kit_allocator_t alloc) {
+  assert(array != NULL);
+  assert(element_size > 0);
+  assert(size >= 0);
+  assert(alloc.allocate != NULL);
+  assert(alloc.deallocate != NULL);
+
   memset(array, 0, sizeof(kit_da_void_t));
 
   if (size > 0)
@@ -28,11 +35,18 @@ static ptrdiff_t eval_capacity(ptrdiff_t current_cap,
 
 void kit_da_resize(kit_da_void_t *array, ptrdiff_t element_size,
                    ptrdiff_t size) {
+  assert(array != NULL);
+  assert(element_size > 0);
+  assert(size >= 0);
+
   if (size <= array->capacity) {
     array->size = size;
   } else {
     ptrdiff_t capacity = eval_capacity(array->capacity, size);
 
+    assert(array->alloc.allocate != NULL);
+    assert(array->alloc.deallocate != NULL);
+
     void *bytes = array->alloc.allocate(array->alloc.state,
                                         element_size * capacity);
     if (bytes != NULL) {
@@ -45,4 +59,4 @@ void kit_da_resize(kit_da_void_t *array, ptrdiff_t element_size,
       array->values   = bytes;
     }
   }
-}
\ No newline at end of file
+}
diff --git a/source/kit/input_buffer.c b/source/kit/input_buffer.c
index 5c38c22..208d0de 100644
--- a/source/kit/input_buffer.c
+++ b/source/kit/input_buffer.c
@@ -1,5 +1,6 @@
 #include "input_buffer.h"
 
+#include <assert.h>
 #include <string.h>
 
 typedef struct {
@@ -11,8 +12,10 @@ typedef struct {
 
 static internal_buffer_t *buf_init(kit_is_handle_t upstream,
                                    kit_allocator_t alloc) {
-  internal_buffer_t *buf;
-  buf = alloc.allocate(alloc.state, sizeof *buf);
+  assert(alloc.allocate != NULL);
+  internal_buffer_t *const buf = alloc.allocate(alloc.state,
+                                                sizeof *buf);
+
   if (buf != NULL) {
     memset(buf, 0, sizeof *buf);
     buf->ref_count = 1;
@@ -20,29 +23,42 @@ static internal_buffer_t *buf_init(kit_is_handle_t upstream,
     buf->alloc     = alloc;
     DA_INIT(buf->data, 0, alloc);
   }
+
   return buf;
 }
 
 static kit_allocator_t buf_alloc(void *p) {
+  assert(p != NULL);
+
   return ((internal_buffer_t *) p)->alloc;
 }
 
 static void buf_acquire(void *p) {
-  internal_buffer_t *buf = (internal_buffer_t *) p;
-  buf->ref_count++;
+  assert(p != NULL);
+
+  ((internal_buffer_t *) p)->ref_count++;
 }
 
 static void buf_release(void *p) {
-  internal_buffer_t *buf = (internal_buffer_t *) p;
+  assert(p != NULL);
+
+  internal_buffer_t *const buf = (internal_buffer_t *) p;
+
   if (--buf->ref_count == 0) {
     DA_DESTROY(buf->data);
+
+    assert(buf->alloc.deallocate != NULL);
     buf->alloc.deallocate(buf->alloc.state, buf);
   }
 }
 
 static void buf_adjust(void *p, ptrdiff_t size) {
-  internal_buffer_t *buf    = (internal_buffer_t *) p;
-  ptrdiff_t          offset = buf->data.size;
+  assert(p != NULL);
+  assert(size >= 0);
+
+  internal_buffer_t *const buf    = (internal_buffer_t *) p;
+  ptrdiff_t const          offset = buf->data.size;
+
   if (offset < size) {
     DA_RESIZE(buf->data, size);
     kit_out_str_t destination = {
diff --git a/source/kit/secure_random.c b/source/kit/secure_random.c
index 65b567c..2f1c796 100644
--- a/source/kit/secure_random.c
+++ b/source/kit/secure_random.c
@@ -108,15 +108,11 @@ void kit_secure_random(ptrdiff_t const size, void *const data) {
   }
 
   size_t const n = fread(data, 1, size, f);
+  fclose(f);
+
   assert(n == size);
 
-  if (n != size) {
+  if (n != size)
     secure_random_fallback(size, data);
-    fclose(f);
-    return;
-  }
-
-  fclose(f);
-  return;
 #endif
 }