ls的实现

一个简单的ls命令的实现：

#include <stdio.h>
#include <dirent.h>

int main(int argc, char *argv[]) {
    DIR *dp;
    struct dirent *dirp;

    if(argc != 2) {
        fprintf(stderr, "usage: ls directory_name
");
        return -1;
    }

    if((dp = opendir(argv[1])) == NULL) {
        fprintf(stderr, "opendir %s error", argv[1]);
        return -1;
    }

    while((dirp = readdir(dp)) != NULL) {
        printf("%s
", dirp->d_name);
    }

    if(closedir(dp) == -1) {
        return -1;
    }

    return 0;
}