cscg24-guacamole

CSCG 2024 Challenge 'Guacamole Mashup'
git clone https://git.sinitax.com/sinitax/cscg24-guacamole
Log | Files | Refs | sfeed.txt

zalloc.c (3030B)

      1/*
      2 * Licensed to the Apache Software Foundation (ASF) under one
      3 * or more contributor license agreements.  See the NOTICE file
      4 * distributed with this work for additional information
      5 * regarding copyright ownership.  The ASF licenses this file
      6 * to you under the Apache License, Version 2.0 (the
      7 * "License"); you may not use this file except in compliance
      8 * with the License.  You may obtain a copy of the License at
      9 *
     10 *   http://www.apache.org/licenses/LICENSE-2.0
     11 *
     12 * Unless required by applicable law or agreed to in writing,
     13 * software distributed under the License is distributed on an
     14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     15 * KIND, either express or implied.  See the License for the
     16 * specific language governing permissions and limitations
     17 * under the License.
     18 */
     19
     20#include <CUnit/CUnit.h>
     21#include <guacamole/mem.h>
     22#include <stdint.h>
     23
     24/**
     25 * Test which verifies that guac_mem_zalloc() returns NULL for all inputs involving
     26 * at least one zero value.
     27 */
     28void test_mem__zalloc_fail_zero() {
     29
     30    CU_ASSERT_PTR_NULL(guac_mem_zalloc(0));
     31    CU_ASSERT_PTR_NULL(guac_mem_zalloc(0, 0));
     32    CU_ASSERT_PTR_NULL(guac_mem_zalloc(0, 0, 0));
     33    CU_ASSERT_PTR_NULL(guac_mem_zalloc(0, 0, 0, 0));
     34    CU_ASSERT_PTR_NULL(guac_mem_zalloc(0, 0, 0, 0, 0));
     35
     36    CU_ASSERT_PTR_NULL(guac_mem_zalloc(1, 0));
     37    CU_ASSERT_PTR_NULL(guac_mem_zalloc(3, 2, 0));
     38    CU_ASSERT_PTR_NULL(guac_mem_zalloc(5, 0, 8, 9));
     39    CU_ASSERT_PTR_NULL(guac_mem_zalloc(99, 99, 99, 0, 99));
     40
     41}
     42
     43/**
     44 * Returns whether all bytes within the given memory region are zero.
     45 *
     46 * @param ptr
     47 *     The first byte of the memory region to test.
     48 *
     49 * @param length
     50 *     The number of bytes within the memory region.
     51 *
     52 * @returns
     53 *     Non-zero if all bytes within the memory region have the value of zero,
     54 *     zero otherwise.
     55 */
     56static int is_all_zeroes(void* ptr, size_t length) {
     57
     58    int result = 0;
     59
     60    unsigned char* current = (unsigned char*) ptr;
     61    for (size_t i = 0; i < length; i++)
     62        result |= *(current++);
     63
     64    return !result;
     65
     66}
     67
     68/**
     69 * Test which verifies that guac_mem_zalloc() successfully allocates blocks of
     70 * memory for inputs that can reasonably be expected to succeed, and that each
     71 * block is zeroed out.
     72 */
     73void test_mem__zalloc_success() {
     74
     75    void* ptr;
     76
     77    ptr = guac_mem_zalloc(123);
     78    CU_ASSERT_PTR_NOT_NULL(ptr);
     79    CU_ASSERT(is_all_zeroes(ptr, 123));
     80    guac_mem_free(ptr);
     81
     82    ptr = guac_mem_zalloc(123, 456);
     83    CU_ASSERT_PTR_NOT_NULL(ptr);
     84    CU_ASSERT(is_all_zeroes(ptr, 123 * 456));
     85    guac_mem_free(ptr);
     86
     87    ptr = guac_mem_zalloc(123, 456, 789);
     88    CU_ASSERT_PTR_NOT_NULL(ptr);
     89    CU_ASSERT(is_all_zeroes(ptr, 123 * 456 * 789));
     90    guac_mem_free(ptr);
     91
     92}
     93
     94/**
     95 * Test which verifies that guac_mem_zalloc() fails to allocate blocks of memory
     96 * that exceed the capacity of a size_t.
     97 */
     98void test_mem__zalloc_fail_large() {
     99    CU_ASSERT_PTR_NULL(guac_mem_zalloc(123, 456, SIZE_MAX));
    100    CU_ASSERT_PTR_NULL(guac_mem_zalloc(SIZE_MAX / 2, SIZE_MAX / 2));
    101}
    102