用C实现ls -t选项

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

// 定义比较函数，用于排序
int compare(const void *a, const void *b) {
    struct stat stat_a, stat_b;
    stat((char *)a, &stat_a);
    stat((char *)b, &stat_b);
    return stat_b.st_mtime - stat_a.st_mtime;
}

int main() {
    // 打开当前目录
    DIR *dir = opendir(".");
    if (dir == NULL) {
        printf("无法打开目录\n");
        return 1;
    }

    // 读取目录中的文件和目录名
    struct dirent *entry;
    int count = 0;
    char **names = NULL;
    while ((entry = readdir(dir)) != NULL) {
        if (entry->d_name[0] != '.') {
            count++;
            names = (char **)realloc(names, count * sizeof(char *));
            names[count - 1] = strdup(entry->d_name);
        }
    }
    closedir(dir);

    // 按照修改时间进行排序
    qsort(names, count, sizeof(char *), compare);

    // 打印排序后的结果
    for (int i = 0; i < count; i++) {
        printf("%s\n", names[i]);
        free(names[i]);
    }
    free(names);

    return 0;
}