From 7ccae1c362a45b28f4fbf96da4f479730e4b382b Mon Sep 17 00:00:00 2001
From: Elis Eriksson <spelis@spelis.li>
Date: Sat, 13 Jun 2026 17:40:25 +0200
Subject: Initial Commit, probably needs heavy code cleanup

---
 src/ivec.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 src/ivec.c

(limited to 'src/ivec.c')

diff --git a/src/ivec.c b/src/ivec.c
new file mode 100644
index 0000000..9c0dd95
--- /dev/null
+++ b/src/ivec.c
@@ -0,0 +1,119 @@
+#include "ivec.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+void iv_free(ivec *v) {
+  free(v->_data);
+  v->_data = NULL;
+  v->_cap = 0;
+  v->len = 0;
+}
+
+static void _iv_ensure_init(ivec *v) {
+  if (v->_data)
+    return;
+
+  v->_cap = 16;
+  v->len = 0;
+
+  v->_data = malloc(v->_cap * sizeof(long long));
+  if (!v->_data) {
+    perror("_v_ensure_init.malloc");
+    abort();
+  }
+}
+
+static void _iv_ensure_capacity(ivec *v) {
+  _iv_ensure_init(v);
+
+  if (v->len >= v->_cap) {
+    v->_cap = (v->_cap == 0) ? 16 : v->_cap * 2;
+
+    long long *tmp = realloc(v->_data, v->_cap * sizeof(long long));
+    if (!tmp) {
+      perror("_v_ensure_capacity.realloc");
+      abort();
+    }
+
+    v->_data = tmp;
+  }
+}
+
+size_t iv_push(ivec *v, long long data) {
+  _iv_ensure_capacity(v);
+
+  v->_data[v->len++] = data;
+  return v->len - 1;
+}
+
+// getter
+long long iv_get(ivec *v, size_t idx) {
+  _iv_ensure_init(v);
+
+  if (idx < v->len) {
+    return v->_data[idx];
+  }
+
+  return 0;
+}
+
+// O(n) shift delete
+long long iv_rem_shift(ivec *v, size_t idx) {
+  _iv_ensure_init(v);
+
+  if (idx >= v->len)
+    return 0;
+
+  int old = v->_data[idx];
+
+  for (size_t j = idx; j + 1 < v->len; j++) {
+    v->_data[j] = v->_data[j + 1];
+  }
+
+  v->len--;
+  return old;
+}
+
+// O(1) swap delete
+long long iv_rem(ivec *v, size_t idx) {
+  _iv_ensure_init(v);
+
+  if (idx >= v->len)
+    return 0;
+
+  int old = v->_data[idx];
+  v->_data[idx] = v->_data[--v->len];
+  return old;
+}
+
+// search
+long long iv_has(ivec *v, long long x,
+                 int (*comp)(const long long, const long long)) {
+  _iv_ensure_init(v);
+
+  if (!comp)
+    return 0;
+
+  for (size_t i = 0; i < v->len; i++) {
+    if (comp(v->_data[i], x) == 0) {
+      return v->_data[i];
+    }
+  }
+
+  return 0;
+}
+
+void iv_shrink(ivec *v) {
+  _iv_ensure_init(v);
+
+  size_t new_cap = v->len ? v->len : 1;
+
+  long long *tmp = realloc(v->_data, new_cap * sizeof(int)); // FIX
+  if (!tmp) {
+    perror("v_shrink.realloc");
+    abort();
+  }
+
+  v->_cap = new_cap;
+  v->_data = tmp;
+}
-- 
cgit v1.3-7-ge9ab