用 c 语言写一个目录遍历程序

#include <stdio.h>#include <stdlib.h>#include <dirent.h>
void listdir(const char *path) {    struct dirent *entry;    DIR *dir = opendir(path);
    if (dir == NULL) {        return;    }
    while ((entry = readdir(dir)) != NULL) {        char fullpath[1024];        snprintf(fullpath, sizeof(fullpath), "%s/%s", path, entry->d_name);
        if (entry->d_type == DT_DIR) {            if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) {                continue;            }            printf("%s/\n", fullpath);            listdir(fullpath);        } else {            printf("%s\n", fullpath);        }    }
    closedir(dir);}
int main(int argc, char **argv) {    if (argc != 2) {        printf("Usage: %s [directory]\n", argv[0]);        return -1;    }
    listdir(argv[1]);
    return 0;}