linux c 获取文件夹大小

#include <stdio.h>
#include <dirent.h>
#include <sys/stat.h>
#include <unistd.h>

long long get_directory_size(const char *dir_path) {
    DIR *dir;
    struct dirent *entry;
    struct stat statbuf;
    long long total_size = 0;

    if ((dir = opendir(dir_path)) == NULL) {
        perror("opendir");
        return -1;
    }

    while ((entry = readdir(dir)) != NULL) {
        char path[1024];
        snprintf(path, sizeof(path), "%s/%s", dir_path, entry->d_name);

        if (stat(path, &statbuf) == -1) {
            perror("stat");
            continue;
        }

        if (S_ISDIR(statbuf.st_mode)) {
            if (strcmp(entry->d_name, ".") != 0 && strcmp(entry->d_name, "..") != 0) {
                long long subdir_size = get_directory_size(path);
                if (subdir_size == -1) {
                    continue;
                }
                total_size += subdir_size;
            }
        } else {
            total_size += statbuf.st_size;
        }
    }

    closedir(dir);
    return total_size;
}

int main(int argc, char *argv[]) {
    if (argc != 2) {
        fprintf(stderr, "Usage: %s <directory>\n", argv[0]);
        return 1;
    }

    long long size = get_directory_size(argv[1]);
    if (size == -1) {
        fprintf(stderr, "Failed to get directory size.\n");
        return 1;
    }

    printf("Total size of '%s': %lld bytes\n", argv[1], size);
    return 0;
}