writing obj loader

[dosdemo] / src / dynarr.h

diff --git a/src/dynarr.h b/src/dynarr.h
index e528305..8690b5a 100644 (file)
--- a/src/dynarr.h
+++ b/src/dynarr.h
@@ -5,18 +5,6 @@
 #ifndef DYNARR_H_
 #define DYNARR_H_
 
-void *dynarr_alloc(int elem, int szelem);
-void dynarr_free(void *da);
-void *dynarr_resize(void *da, int elem);
-
-int dynarr_empty(void *da);
-int dynarr_size(void *da);
-
-/* stack semantics */
-void *dynarr_push(void *da, void *item);
-void *dynarr_pop(void *da);
-
-
 /* usage example:
  * -------------
  * int *arr = dynarr_alloc(0, sizeof *arr);
@@ -34,5 +22,59 @@ void *dynarr_pop(void *da);
  *  dynarr_free(arr);
  */
 
+void *dynarr_alloc(int elem, int szelem);
+void dynarr_free(void *da);
+void *dynarr_resize(void *da, int elem);
+
+/* dynarr_empty returns non-zero if the array is empty
+ * Complexity: O(1) */
+int dynarr_empty(void *da);
+/* dynarr_size returns the number of elements in the array
+ * Complexity: O(1) */
+int dynarr_size(void *da);
+
+void *dynarr_clear(void *da);
+
+/* stack semantics */
+void *dynarr_push(void *da, void *item);
+void *dynarr_pop(void *da);
+
+/* Finalize the array. No more resizing is possible after this call.
+ * Use free() instead of dynarr_free() to deallocate a finalized array.
+ * Returns pointer to the finalized array.
+ * dynarr_finalize can't fail.
+ * Complexity: O(n)
+ */
+void *dynarr_finalize(void *da);
+
+/* helper macros */
+#define DYNARR_RESIZE(da, n) \
+       do { (da) = dynarr_resize((da), (n)); } while(0)
+#define DYNARR_CLEAR(da) \
+       do { (da) = dynarr_clear(da); } while(0)
+#define DYNARR_PUSH(da, item) \
+       do { (da) = dynarr_push((da), (item)); } while(0)
+#define DYNARR_POP(da) \
+       do { (da) = dynarr_pop(da); } while(0)
+
+/* utility macros to push characters to a string. assumes and maintains
+ * the invariant that the last element is always a zero
+ */
+#define DYNARR_STRPUSH(da, c) \
+       do { \
+               char cnull = 0, ch = (char)(c); \
+               (da) = dynarr_pop(da); \
+               (da) = dynarr_push((da), &ch); \
+               (da) = dynarr_push((da), &cnull); \
+       } while(0)
+
+#define DYNARR_STRPOP(da) \
+       do { \
+               char cnull = 0; \
+               (da) = dynarr_pop(da); \
+               (da) = dynarr_pop(da); \
+               (da) = dynarr_push((da), &cnull); \
+       } while(0)
+
 
 #endif /* DYNARR_H_ */