//--------------------------------------------
// NAME:Konstantin Georgiev
// CLASS:XIa
// NUMBER:15
// PROBLEM:#1
// FILE NAME:m.c
// FILE PURPOSE: ls unix function implementation in C
//---------------------------------------------
#include<stdio.h>
#include<dirent.h>
#include<stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
//--------------------------------------------
// FUNCTION: printNormalContents
// prints a directory's contents
// PARAMETERS:
// char *thing - The name of the directory to be opened
// int hidden - a flag that tells the function if it needs to display hidden files
// int isDirectory - a flag that tells the function if it needs to print the directory name
//--------------------------------------------
void printNormalContents(char *thing, int hidden, int isDirectory){
	if(isDirectory != 1){
		printf("\n%s:\n", thing);
	}
	DIR*p;
	struct dirent *d;
	p = opendir(thing);
	if(p == NULL){
		fprintf(stderr, "ls: cannot access %s: No such file or directory", thing);
	return;
	}
	while(d=readdir(p)){
	if(d->d_name[0] != '.' || hidden == 1){
	struct stat path_stat;
    stat(d->d_name, &path_stat);
	if(S_ISREG(path_stat.st_mode)){
  		printf("- %s\n",d->d_name);}
	else if(S_ISDIR(path_stat.st_mode)){
  		printf("d %s\n",d->d_name);}
	else if(S_ISCHR(path_stat.st_mode)){
  		printf("c %s\n",d->d_name);}
	else if(S_ISBLK(path_stat.st_mode)){
  		printf("b %s\n",d->d_name);}
	else if(S_ISFIFO(path_stat.st_mode)){
  		printf("p %s\n",d->d_name);}
	else if(S_ISLNK(path_stat.st_mode)){
  		printf("l %s\n",d->d_name);}
	else if(S_ISSOCK(path_stat.st_mode)){
  		printf("s %s\n",d->d_name);}
}
}
}
int main(int argc, char **argv){
int hidden = 0;
int flag = 0;
int dirFlag = 0;
if(argc > 1){
	if(argc == 2){dirFlag = 1;}
	if(argv[1][0] == '.'){printNormalContents("./", hidden, 1);
		return;}
	for(int i = 1; i < argc; i++){
		if(strstr(argv[i], "-") != NULL && (strstr(argv[i], "a") != NULL || strstr(argv[i], "A") != NULL) ){hidden = 1;}
	}
	for(int i = 1; i < argc; i++){
		if(strstr(argv[i], "-") == NULL){
			if(strstr(argv[i], "/") == NULL){
				if(strstr(argv[i], ".") != NULL && argv[i][0] != '.'){
					if(access(argv[i], F_OK) != -1){
					printf("- %s\n", argv[i]);}
					else{
		fprintf(stderr, "ls: cannot access %s: No such file or directory", argv[i]);}
				}
			else{
			printNormalContents(argv[i], hidden, dirFlag);}}
			else{printNormalContents(argv[i], hidden, dirFlag);}
			flag = 1;
		}
	}
	if(flag == 0){printNormalContents("./", hidden, 1);}
}
else{
printNormalContents("./", hidden, 1);}
}