libc/src/search/hcreate_r.cpp

   1 //===-- Implementation of hcreate_r -----------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/search/hcreate_r.h"
  10 #include "src/__support/HashTable/randomness.h"
  11 #include "src/__support/HashTable/table.h"
  12 #include "src/__support/macros/config.h"
  13 #include "src/errno/libc_errno.h"
  14
  15 namespace LIBC_NAMESPACE_DECL {
  16 LLVM_LIBC_FUNCTION(int, hcreate_r,
  17                    (size_t capacity, struct hsearch_data *htab)) {
  18   if (htab == nullptr) {
  19     libc_errno = EINVAL;
  20     return 0;
  21   }
  22   uint64_t randomness = internal::randomness::next_random_seed();
  23   internal::HashTable *table =
  24       internal::HashTable::allocate(capacity, randomness);
  25   if (table == nullptr) {
  26     libc_errno = ENOMEM;
  27     return 0;
  28   }
  29   htab->__opaque = table;
  30   return 1;
  31 }
  32
  33 } // namespace LIBC_NAMESPACE_DECL