hw2 done

lib/vector.c

@@ -0,0 +1,39 @@
+#include <errcode.h>
+#include <uart.h>
+#include <vector.h>
+#include <utils.h>
+#include <kmalloc.h>
+#include <string.h>
+
+vector_t *make_vector(size_t size)
+{
+  vector_t *ret = kmalloc(sizeof(vector_t));
+  ret->size = size;
+  uint32_t msb = msb32(size);
+  ret->cap = (msb == size) ? size : (msb << 1);
+  ret->cap = MAX(ret->cap, 4);
+  ret->data = kmalloc(ret->cap * sizeof(uint64_t));
+  memzero(ret->data, ret->data + ret->cap);
+
+  return ret;
+}
+
+uint64_t vec_at(const vector_t *vec, size_t idx)
+{
+  if (idx >= vec->size)
+    exit(ERR_VECTOR_OOR);
+  
+  return vec->data[idx];
+}
+
+vector_t *vec_push(vector_t *vec, uint64_t val)
+{
+  if (vec->size == vec->cap) {
+    uint64_t *old = vec->data;
+    vec->data = kmalloc((vec->cap <<= 1) * sizeof(uint64_t));
+    memcpy(vec->data, old, vec->size * sizeof(uint64_t));
+  }
+
+  vec->data[vec->size++] = val;
+  return vec;
+}