macros

common.h

@@ -0,0 +1,30 @@
+// common.h
+#ifndef _ZIG1_COMMON_H__
+#define _ZIG1_COMMON_H__
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#define SLICE_INIT(Type, initial_cap) ({           \
+    Type* arr = calloc(initial_cap, sizeof(Type)); \
+    if (!arr)                                      \
+        exit(1);                                   \
+    (__typeof__(Type*)) { arr };                   \
+})
+
+#define SLICE_RESIZE(slice, Type, new_cap) ({                  \
+    uint32_t cap = (new_cap);                                  \
+    Type* new_arr = realloc((slice)->arr, cap * sizeof(Type)); \
+    if (!new_arr)                                              \
+        exit(1);                                               \
+    (slice)->arr = new_arr;                                    \
+    (slice)->cap = cap;                                        \
+})
+
+#define SLICE_ENSURE_CAPACITY(slice, Type, additional) ({                                                                             \
+    if ((slice)->len + (additional) > (slice)->cap) {                                                                                 \
+        SLICE_RESIZE(slice, Type, ((slice)->cap * 2 > (slice)->len + (additional)) ? (slice)->cap * 2 : (slice)->len + (additional)); \
+    }                                                                                                                                 \
+})
+
+#endif