init basic

libcore/vector.h

@@ -0,0 +1,54 @@
+// vector.h
+#ifndef VECTOR_H
+#define VECTOR_H
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+#define vector_header(name, type) \
+    struct { \
+        size_t size; \
+        size_t cap; \
+        type *data; \
+    } name \
+
+#define vector_init(vec) \
+    do { \
+        (vec).size = 0, \
+        (vec).cap = 0, \
+        (vec).data = NULL; \
+    } while(0)
+
+#define vector_push(vec, value) \
+    do { \
+        if (vec.size >= vec.cap) { \
+            int cap = vec.cap ? vec.cap * 2 : 8; \
+            void* data = realloc(vec.data, cap * sizeof(*vec.data)); \
+            if (!data) { \
+                fprintf(stderr, "vector_push: realloc failed\n"); \
+                exit(1); \
+            } \
+            (vec).cap = cap; \
+            (vec).data = data; \
+        } \
+        (vec).data[(vec).size++] = value; \
+    } while(0)
+
+#define vector_pop(vec) \
+    ((vec).data[--(vec).size])
+
+#define vector_at(vec, idx) \
+    (((vec).data)[idx])
+
+#define vector_idx(vec, ptr) \
+    ((ptr) - (vec).data)
+
+#define vector_free(vec) \
+    do { \
+        free((vec).data); \
+        (vec).data = NULL; \
+        (vec).size = (vec).cap = 0; \
+    } while(0)
+
+#endif