broguht over the 3D pipeline from the demo

[eradicate] / src / dynarr.h

diff --git a/src/dynarr.h b/src/dynarr.h
new file mode 100644 (file)
index 0000000..8690b5a
--- /dev/null
+++ b/src/dynarr.h
@@ -0,0 +1,80 @@
+/* dynarr - dynamic resizable C array data structure
+ * author: John Tsiombikas <nuclear@member.fsf.org>
+ * license: public domain
+ */
+#ifndef DYNARR_H_
+#define DYNARR_H_
+
+/* usage example:
+ * -------------
+ * int *arr = dynarr_alloc(0, sizeof *arr);
+ *
+ * int x = 10;
+ * arr = dynarr_push(arr, &x);
+ * x = 5;
+ * arr = dynarr_push(arr, &x);
+ * x = 42;
+ * arr = dynarr_push(arr, &x);
+ *
+ * for(i=0; i<dynarr_size(arr); i++) {
+ *     printf("%d\n", arr[i]);
+ *  }
+ *  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_ */