From 40db61eb7a2019ced97f09a9687139f35749f4e0 Mon Sep 17 00:00:00 2001
From: Albert Cervin <albert@acervin.com>
Date: Sat, 25 Feb 2023 21:37:48 +0100
Subject: Introduce vec and hashmap

Convenience macros for a hashmap and a growable vector.
---
 src/vec.h | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 src/vec.h

(limited to 'src/vec.h')

diff --git a/src/vec.h b/src/vec.h
new file mode 100644
index 0000000..2d5bd32
--- /dev/null
+++ b/src/vec.h
@@ -0,0 +1,61 @@
+#ifndef _VEC_H
+#define _VEC_H
+
+#define VEC(entry)                                                             \
+  struct {                                                                     \
+    entry *entries;                                                            \
+    uint32_t nentries;                                                         \
+    uint32_t capacity;                                                         \
+  }
+
+#define VEC_INIT(vec, initial_capacity)                                        \
+  (vec)->entries = malloc(sizeof((vec)->entries[0]) * initial_capacity);       \
+  (vec)->capacity = initial_capacity;                                          \
+  (vec)->nentries = 0;
+
+#define VEC_DESTROY(vec)                                                       \
+  free((vec)->entries);                                                        \
+  (vec)->entries = NULL;                                                       \
+  (vec)->capacity = 0;                                                         \
+  (vec)->nentries = 0;
+
+#define VEC_GROW(vec, new_size)                                                \
+  if (new_size > (vec)->capacity) {                                            \
+    (vec)->capacity = new_size;                                                \
+    (vec)->entries = realloc((vec)->entries,                                   \
+                             (sizeof((vec)->entries[0]) * (vec)->capacity));   \
+  }
+
+#define VEC_PUSH(vec, entry)                                                   \
+  if ((vec)->nentries + 1 >= (vec)->capacity) {                                \
+    VEC_GROW(vec, (vec)->capacity * 2);                                        \
+  }                                                                            \
+                                                                               \
+  (vec)->entries[(vec)->nentries] = entry;                                     \
+  ++(vec)->nentries;
+
+#define VEC_APPEND(vec, var)                                                   \
+  if ((vec)->nentries + 1 >= (vec)->capacity) {                                \
+    VEC_GROW(vec, (vec)->capacity * 2);                                        \
+  }                                                                            \
+                                                                               \
+  var = &((vec)->entries[(vec)->nentries]);                                    \
+  ++(vec)->nentries;
+
+#define VEC_FOR_EACH(vec, var) VEC_FOR_EACH_INDEXED(vec, var, i)
+
+#define VEC_FOR_EACH_INDEXED(vec, var, idx)                                    \
+  for (uint32_t keep = 1, idx = 0, size = (vec)->nentries;                     \
+       keep && idx != size; keep = !keep, idx++)                               \
+    for (var = (vec)->entries + idx; keep; keep = !keep)
+
+#define VEC_SIZE(vec) (vec)->nentries
+#define VEC_CAPACITY(vec) (vec)->capacity
+#define VEC_ENTRIES(vec) (vec)->entries
+#define VEC_EMPTY(vec) ((vec)->nentries == 0)
+
+#define VEC_CLEAR(vec) (vec)->nentries = 0
+#define VEC_BACK(vec)                                                          \
+  ((vec)->nentries > 0 ? &((vec)->entries[(vec)->nentries - 1]) : NULL)
+
+#endif
-- 
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