如何使用readdir实现目录比较

#<span>include <dirent.h></span>
#<span>include <stdio.h></span>
#<span>include <stdlib.h></span>
#<span>include <string.h></span>

int read_directory(<span>const char *path, char ***files)</span> {
    DIR *dir = opendir(path);
    if (!dir) {
        perror("opendir");
        return -1;
    }

    <span>struct dirent *entry;</span>
    int count = 0;
    while ((entry = readdir(dir)) != NULL) {
        count++;
    }
    closedir(dir);

    *files = (char **)malloc(sizeof(char *) * count);
    if (!*files) {
        perror("malloc");
        return -1;
    }

    dir = opendir(path);
    if (!dir) {
        perror("opendir");
        return -1;
    }

    int i = 0;
    while ((entry = readdir(dir)) != NULL) {
        (*files)[i] = strdup(entry->d_name);
        i++;
    }
    closedir(dir);

    return 0;
}

int compare_directories(<span>const char **dir1, int size1, const char **dir2, int size2)</span> {
    if (size1 != size2) {
        return 0;
    }

    for (int i = 0; i < size1; i++) {
        if (strcmp(dir1[i], dir2[i]) != 0) {
            return 0;
        }
    }

    return 1;
}

int main() {
    char **dir1_files, **dir2_files;
    int dir1_size, dir2_size;

    dir1_size = read_directory("path/to/dir1", &dir1_files);
    dir2_size = read_directory("path/to/dir2", &dir2_files);

    if (dir1_size == -1 || dir2_size == -1) {
        fprintf(stderr, "Error reading directories\n");
        return 1;
    }

    int result = compare_directories(dir1_files, dir1_size, dir2_files, dir2_size);

    if (result) {
        printf("Directories are the same\n");
    } else {
        printf("Directories are different\n");
    }

    for (int i = 0; i < dir1_size; i++) {
        free(dir1_files[i]);
    }
    free(dir1_files);

    for (int i = 0; i < dir2_size; i++) {
        free(dir2_files[i]);
    }
    free(dir2_files);

    return 0;
}