hexmemcalc

hexmemcalc.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/**
 * The MIT License (MIT)
 *
 * Copyright © 2022 Dom Rodriguez (shymega)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the “Software”), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.

* THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/

void print_help(char **argv) {
    fprintf(stdout, "%s <start_address> <end_address>\n", argv[0]);
}

int main(int argc, char **argv) {
    if (argc <= 1) {
        fprintf(stdout, "Not enough arguments!\n");
        print_help(argv);
        return EXIT_FAILURE;
    }

    if (argv[1] == NULL) {
        fprintf(stderr, "Memory start hex address NULL!\n");
        return EXIT_FAILURE;
    }

    if (argv[2] == NULL) {
        fprintf(stderr, "Memory end hex address: NULL!\n");
        return EXIT_FAILURE;
    }

    int MEM_BEGIN = strtol(argv[1], NULL, 16);
    int MEM_END = strtol(argv[2], NULL, 16);

    if (MEM_BEGIN == 0) {
        fprintf(stderr, "String hex parsing failed [MEM_BEGIN]\n");
        return EXIT_FAILURE;
    } else if (MEM_END == 0) {
        fprintf(stderr, "String hex parsing failed [MEM_END]\n");
        return EXIT_FAILURE;
    }

    int difference_bytes = (MEM_END - MEM_BEGIN) * sizeof(int);

    double difference_kb = difference_bytes / 1024.00;
    double difference_mb = difference_kb / 1024.00;

    if (difference_kb == 0.00) {
        return EXIT_SUCCESS;
    } else if (difference_mb == 0.00) {
        return EXIT_SUCCESS;
    }

    fprintf(stdout, "kb: %.2lf\n", difference_bytes / 1024.00);
    fprintf(stdout, "mb: %.2lf\n", difference_bytes / 1024.00 / 1024.00);

    return EXIT_SUCCESS;
}