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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "util_allocator.h"
#include <string.h>

void cx_testing_allocator_add(cx_testing_allocator_s *data, void *ptr) {
    data->tracked[data->live] = ptr;
    data->live++;
}

int cx_testing_allocator_remove(cx_testing_allocator_s *data, void *ptr) {
    for (int i = 0; i < data->live; i++) {
        if (data->tracked[i] == ptr) {
            data->tracked[i] = data->tracked[data->live - 1];
            data->live--;
            return 0;
        }
    }
    return 1;
}

void *cx_malloc_testing(void *d, size_t n) {
    cx_testing_allocator_s *data = d;
    void *ptr = malloc(n);
    data->alloc_total++;
    if (ptr == NULL) {
        data->alloc_failed++;
    } else {
        cx_testing_allocator_add(data, ptr);
    }
    return ptr;
}

void *cx_realloc_testing(void *d, void *mem, size_t n) {
    cx_testing_allocator_s *data = d;
    void *ptr = realloc(mem, n);
    if (ptr == mem) {
        return ptr;
    } else {
        data->alloc_total++;
        if (ptr == NULL) {
            data->alloc_failed++;
        } else {
            data->free_total++;
            if (cx_testing_allocator_remove(data, mem)) {
                data->free_failed++;
            }
            cx_testing_allocator_add(data, ptr);
        }
        return ptr;
    }
}

void *cx_calloc_testing(void *d, size_t nelem, size_t n) {
    cx_testing_allocator_s *data = d;
    void *ptr = calloc(nelem, n);
    data->alloc_total++;
    if (ptr == NULL) {
        data->alloc_failed++;
    } else {
        cx_testing_allocator_add(data, ptr);
    }
    return ptr;
}

void cx_free_testing(void *d, void *mem) {
    cx_testing_allocator_s *data = d;
    data->free_total++;
    if (cx_testing_allocator_remove(data, mem)) {
        data->free_failed++;
        // do not even attempt to free mem, because it is likely to segfault
    } else {
        free(mem);
    }
}

cx_allocator_class cx_testing_allocator_class = {
        cx_malloc_testing,
        cx_realloc_testing,
        cx_calloc_testing,
        cx_free_testing
};

cx_testing_allocator_s cx_testing_allocator_data;

struct cx_allocator_s cx_testing_allocator = {
        &cx_testing_allocator_class,
        &cx_testing_allocator_data
};
CxAllocator cxTestingAllocator = &cx_testing_allocator;

void cxTestingAllocatorReset(void) {
    memset(&cx_testing_allocator_data, 0, sizeof(cx_testing_allocator_s));
}

int cxTestingAllocatorVerify(void) {
    return cx_testing_allocator_data.live == 0
           && cx_testing_allocator_data.alloc_failed == 0 && cx_testing_allocator_data.free_failed == 0
           && cx_testing_allocator_data.alloc_total == cx_testing_allocator_data.free_total;
}