chore: make specific vector (heap stack) impl

include/util.h

@@ -3,6 +3,7 @@
 
 #include <keys.h>
 #include <stdbool.h>
+#include <stdint.h>
 #include <sys/types.h>
 
 enum keys find_keyname(char *);
@@ -10,4 +11,19 @@ enum keys find_ansi(char *);
 void read_press(u_char *, char *);
 void strcln(char **dest, const char *source);
 
+struct Vector {
+    uint32_t length;
+    uint32_t alloc_len;
+    uint16_t alloc_size;
+    void** pages;
+};
+
+struct Vector vec_new();
+int vec_push(struct Vector*, void* item);
+void vec_free(struct Vector*);
+void vec_clear(struct Vector*);
+void vec_reset(struct Vector*);
+void* vec_pop(struct Vector*); // wont free it, nor shrink vec list space
+void* vec_get(struct Vector*, uint32_t index);
+
 #endif

src/util.c

@@ -1,3 +1,4 @@
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -66,3 +67,59 @@ static int selret_magic() {
   timeout.tv_usec = 0;
   return select(1, &set, NULL, NULL, &timeout);
 }
+
+
+// Vector shii
+struct Vector vec_new() {
+  struct Vector vec;
+  vec_clear(&vec);
+  return vec;
+}
+
+int vec_push(struct Vector* vec, void* item) {
+  if (vec->length >= vec->alloc_len) {
+    uint32_t new_size = vec->alloc_len + vec->alloc_size;
+    void **new_location = realloc(vec->pages, vec->alloc_size);
+    if (new_location != NULL) {
+      vec->alloc_size = new_size;
+      vec->pages = new_location;
+    } else {
+      return -1;
+    }
+  }
+
+  vec->pages[vec->length] = item;
+  vec->length++;
+  return 0;
+}
+
+void vec_free(struct Vector* vec) {
+  for(; vec->length > 0; vec->length--)
+    free(vec->pages[--vec->length]);
+
+  vec_clear(vec);
+}
+
+void vec_clear(struct Vector* vec) {
+  free(vec->pages);
+  vec_reset(vec);
+}
+
+void vec_reset(struct Vector* vec) {
+  vec->length = 0;
+  vec->alloc_len = 0;
+  vec->alloc_size = 4096; // 4KiB page size?
+  vec->pages = NULL;
+}
+
+void* vec_pop(struct Vector* vec) {
+  if (vec->length == 0)
+    return NULL;
+
+  vec->length--;
+  return vec->pages[vec->length];
+}
+
+void* vec_get(struct Vector* vec, uint32_t index) {
+  return vec->pages[index];
+}