lander/lsm/src/lsm_store_node.c

#include <stdlib.h>

#include "lsm.h"
#include "lsm_store_node.h"

lsm_error lsm_store_inode_init(lsm_store_inode **ptr, const char c) {
  lsm_store_inode *node = calloc(1, sizeof(lsm_store_inode));

  if (node == NULL) {
    return lsm_error_failed_alloc;
  }

  node->key = c;
  *ptr = node;

  return lsm_error_ok;
}

lsm_error lsm_store_node_init(lsm_store_node **ptr) {
  lsm_store_node *node = calloc(1, sizeof(lsm_store_node));

  if (node == NULL) {
    return lsm_error_failed_alloc;
  }

  *ptr = node;

  return lsm_error_ok;
}

lsm_error lsm_store_node_search(lsm_store_node **out_ptr, lsm_store_node *node,
                                const char c) {
  if (node->size == 0) {
    return lsm_error_not_found;
  }

  lsm_store_inode *parent = node->root;
  lsm_store_inode *child;
  lsm_store_node *out = NULL;

  while (1) {
    if (parent->key == c) {
      out = parent->next;
      break;
    }

    child = (c < parent->key) ? parent->left : parent->right;

    if (child == NULL) {
      break;
    }

    parent = child;
  };

  if (out == NULL) {
    return lsm_error_not_found;
  }

  *out_ptr = out;

  return lsm_error_ok;
}