options/config

[demo_prior] / libs / treestore / src / dynarr.h

diff --git a/libs/treestore/src/dynarr.h b/libs/treestore/src/dynarr.h
new file mode 100644 (file)
index 0000000..513a431
--- /dev/null
+++ b/libs/treestore/src/dynarr.h
@@ -0,0 +1,69 @@
+/* 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 = ts_dynarr_alloc(0, sizeof *arr);
+ *
+ * int x = 10;
+ * arr = ts_dynarr_push(arr, &x);
+ * x = 5;
+ * arr = ts_dynarr_push(arr, &x);
+ * x = 42;
+ * arr = ts_dynarr_push(arr, &x);
+ *
+ * for(i=0; i<ts_dynarr_size(arr); i++) {
+ *     printf("%d\n", arr[i]);
+ *  }
+ *  ts_dynarr_free(arr);
+ */
+
+void *ts_dynarr_alloc(int elem, int szelem);
+void ts_dynarr_free(void *da);
+void *ts_dynarr_resize(void *da, int elem);
+
+int ts_dynarr_empty(void *da);
+int ts_dynarr_size(void *da);
+
+void *ts_dynarr_clear(void *da);
+
+/* stack semantics */
+void *ts_dynarr_push(void *da, void *item);
+void *ts_dynarr_pop(void *da);
+
+
+/* helper macros */
+#define DYNARR_RESIZE(da, n) \
+       do { (da) = ts_dynarr_resize((da), (n)); } while(0)
+#define DYNARR_CLEAR(da) \
+       do { (da) = ts_dynarr_clear(da); } while(0)
+#define DYNARR_PUSH(da, item) \
+       do { (da) = ts_dynarr_push((da), (item)); } while(0)
+#define DYNARR_POP(da) \
+       do { (da) = ts_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) = ts_dynarr_pop(da); \
+               (da) = ts_dynarr_push((da), &ch); \
+               (da) = ts_dynarr_push((da), &cnull); \
+       } while(0)
+
+#define DYNARR_STRPOP(da) \
+       do { \
+               char cnull = 0; \
+               (da) = ts_dynarr_pop(da); \
+               (da) = ts_dynarr_pop(da); \
+               (da) = ts_dynarr_push((da), &cnull); \
+       } while(0)
+
+
+#endif /* DYNARR_H_ */