cp files

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

FILE *safeOpenFile(const char *const path, const char *const mode) {
    FILE *file = NULL;
    file = fopen(path, mode);
    if (file == NULL) {
        perror("opening error!");
        exit(EXIT_FAILURE);
    }
    return file;
}

void safeCloseFile(FILE *file) {
    if (fclose(file) == EOF) {
        perror(NULL);
    }
}

void argCheck(int argc) {
    if (argc < 3) {
        fprintf(stderr, "MORE ARG(s) NEEDED!\n");
        exit(-1);
    }
}


int main(int argc, char **argv) {
    argCheck(argc);
    FILE *fin = safeOpenFile(argv[1], "rb");
    FILE *fout = safeOpenFile(argv[2], "wb");

    for (uint8_t byte; fread(&byte, sizeof(byte), 1, fin) == 1;) {
        fwrite(&byte, sizeof(byte), 1, fout);
    }

    safeCloseFile(fin);
    safeCloseFile(fout);
    return 0;
}