如何用readdir实现递归目录遍历

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <sys/stat.h>

// 函数声明
void recursive_readdir(const char *path);

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

    const char *start_path = argv[1];
    recursive_readdir(start_path);
    return EXIT_SUCCESS;
}

void recursive_readdir(const char *path) {
    DIR *dir = opendir(path);
    if (dir == NULL) {
        perror("无法打开目录");
        return;
    }

    struct dirent *entry;
    while ((entry = readdir(dir)) != NULL) {
        // 跳过当前目录和父目录
        if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
            continue;

        // 构造完整路径
        size_t len = strlen(path) + strlen(entry->d_name) + 2; // +1 for '/' and +1 for '\0'
        char full_path[len];
        snprintf(full_path, len, "%s/%s", path, entry->d_name);

        struct stat st;
        if (stat(full_path, &st) == -1) {
            perror("无法获取文件状态");
            continue;
        }

        if (S_ISDIR(st.st_mode)) {
            // 如果是目录，递归浏览
            printf("目录: %s\n", full_path);
            recursive_readdir(full_path);
        } else {
            // 如果是文件，进行处理（这里以打印文件名为例）
            printf("文件: %s\n", full_path);
        }
    }

    closedir(dir);
}

gcc -o recursive_readdir recursive_readdir.c
./recursive_readdir /path/to/directory