How to account for destination being file or directory in cp implementation in c

I am writing a pseudo-shell in c for a class and my cp command needs to account for the destination being a file or a directory. I realized after I implemented everything I currently only truly account for a file name as destinationPath. How should I go about accounting for that?

void copyFile(char *sourcePath, char *destinationPath) {
    //cp command
    int srcCheck, destCheck, standardCheck;
    char* buff[1024];

    srcCheck = open(sourcePath, O_RDONLY);
    if (srcCheck < 0) {
        write(1, "Error with opening source\n", strlen("Error with opening source\n"));
        return;
    }

    destCheck = open(destinationPath, O_WRONLY | O_CREAT | O_TRUNC, S_IRWXU | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);

    if (destCheck < 0) {
        close(srcCheck);
        write(1, "Error something went wrong with dest\n", strlen("Error something went wrong with dest\n"));
        return;
    }


    while ((standardCheck = read(srcCheck, buff, BUFSIZ)) != 0) {
        write(destCheck, buff, standardCheck);
    }

    if (standardCheck == -1) {
        write(1, "Error reading\n", strlen("Error reading\n"));
        return;
    }

    if (close(srcCheck) == -1) {
        write(1, "Error closing source\n", strlen("Error closing source\n"));
        return;
    }

    if(close(destCheck) == -1) {
        write(1, "Error closing dest\n", strlen("Error closing dest\n"));
        return;
    }

}

I already looked through a couple different cp implementations but couldn’t find any that considered destination may be a directory

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