如何用copendir实现递归目录遍历

opendir 函数本身无法实现递归目录遍历，需要结合 readdir、closedir 和 stat (或 lstat 避免符号链接问题) 函数，并使用递归调用来实现。以下是一个改进的 C 语言示例，它能够更稳健地处理目录遍历，包括符号链接：

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <dirent.h>#include <sys/stat.h>#include <limits.h>  // for PATH_MAXvoid list_directory_contents(const char *path) {    DIR *dir;    struct dirent *entry;    struct stat path_stat;    char full_path[PATH_MAX];    dir = opendir(path);    if (!dir) {        perror("opendir");        return;    }    while ((entry = readdir(dir)) != NULL) {        if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) {            continue;        }        // 使用 snprintf 避免缓冲区溢出        if (snprintf(full_path, sizeof(full_path), "%s/%s", path, entry->d_name) >= sizeof(full_path)) {            fprintf(stderr, "Path too long: %s/%sn", path, entry->d_name);            continue;        }        if (lstat(full_path, &path_stat) == -1) { // 使用 lstat 处理符号链接            perror("lstat");            continue;        }        if (S_ISDIR(path_stat.st_mode)) {            list_directory_contents(full_path);        } else if (S_ISREG(path_stat.st_mode)) { // 只打印常规文件            printf("%sn", full_path);        } else if (S_ISLNK(path_stat.st_mode)) {            printf("Symbolic link: %sn", full_path); // 处理符号链接        } else {            printf("Other file type: %sn", full_path); // 处理其他文件类型        }    }    closedir(dir);}int main(int argc, char *argv[]) {    if (argc != 2) {        fprintf(stderr, "Usage: %s <directory>n", argv[0]);        return EXIT_FAILURE;    }    list_directory_contents(argv[1]);    return EXIT_SUCCESS;}

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