根据字符串路径确定C中是否存在文件

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

int main(int argc, char *argv[]) {
    char *path = argv[1];
    struct stat st;

    if (stat(path, &st) == -1) {
        perror("stat");
        exit(1);
    }

    if (S_ISDIR(st.st_mode)) {
        printf("%s is a directory\n", path);
    } else if (S_ISREG(st.st_mode)) {
        printf("%s is a regular file\n", path);
    } else if (S_ISFIFO(st.st_mode)) {
        printf("%s is a named pipe\n", path);
    } else if (S_ISLNK(st.st_mode)) {
        printf("%s is a symbolic link\n", path);
    } else {
        printf("%s is an unknown file type\n", path);
    }

    return 0;
}