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ls.c
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ls.c
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#include "headers.h"
// returns 1 if it is a dir else 0
int check_if_dir(char* name){
struct stat file1Stat;
int okay1 = stat(name, &file1Stat);
if(okay1==0 && S_ISDIR(file1Stat.st_mode)){
printf("d");
return 1;
}
else{
printf("-");
return 1;
}
}
int char_output(char to_print, int okay){
if(okay){
printf("%c",to_print);
}
else{
printf("-");
}
return 1;
}
int print_permissions(char* name){
struct stat fileStat;
int okay1 = stat(name, &fileStat);
char_output('r',(fileStat.st_mode & S_IRUSR));
char_output('w',(fileStat.st_mode & S_IWUSR));
char_output('x',(fileStat.st_mode & S_IXUSR));
//for group
char_output('r',(fileStat.st_mode & S_IRGRP));
char_output('w',(fileStat.st_mode & S_IWGRP));
char_output('x',(fileStat.st_mode & S_IXGRP));
//for others
char_output('r',(fileStat.st_mode & S_IROTH));
char_output('w',(fileStat.st_mode & S_IWOTH));
char_output('x',(fileStat.st_mode & S_IXOTH));
return 0;
}
int print_hardlinks(char* name){
struct stat fileStat;
int okay1 = stat(name, &fileStat);
printf("%d\t", fileStat.st_nlink);
return 0;
}
int print_user_group(char* name){
struct stat fileStat;
int okay1 = stat(name, &fileStat);
//For the user id.
// statBuf.st_gid;
struct passwd *pws;
pws = getpwuid(fileStat.st_uid);
printf("%s\t",pws->pw_name);
struct group *pws2;
// printf("bruh\n");
pws2 = getgrgid(fileStat.st_gid);
printf("%s\t",pws2->gr_name);
return 0;
}
int print_size(char* name){
struct stat fileStat;
int okay1 = stat(name, &fileStat);
printf("%lld\t",fileStat.st_size);
return 0;
}
int print_date(char*name){
struct stat attrib;
struct tm time_last,time_present;
time_t present = time(NULL);
stat(name, &attrib);
char time[100];
localtime_r(&attrib.st_mtime, &time_last);
localtime_r(&present, &time_present);
if(time_last.tm_year!= time_present.tm_year){
strftime(time, 50, "%b %d %Y", localtime(&attrib.st_mtime));
}
else{
strftime(time, 50, "%b %d %H:%M", localtime(&attrib.st_mtime));
}
printf ("%s\t", time);
return 0;
}
int check_la(int* flag_l, int* flag_a, int index, char* path[]){
if(path[index][0]=='-'){
int len = strlen(path[index]);
if(len==2){
if(path[index][1]=='a'){
*flag_a = 1;
}
else if(path[index][1]=='l'){
*flag_l=1;
}
}
else if(len==3){
if( (path[index][1]=='a' && path[index][2]=='l') || (path[index][2]=='a' && path[index][1]=='l') ){
*flag_l = 1;
*flag_a = 1;
}
}
}
return 1;
}
int check_if_path( int index, char* path[]){
if(path[index][0]=='-'){
int len = strlen(path[index]);
if(len==2){
if(path[index][1]=='a'){
return 0;
}
else if(path[index][1]=='l'){
return 0;
}
}
else if(len==3){
if( (path[index][1]=='a' && path[index][2]=='l') || (path[index][2]=='a' && path[index][1]=='l') ){
return 0;
}
}
}
return 1;
}
// prints size of the thing
int size_of(int flag_a, int flag_l ){
struct dirent *de;
DIR *dr = opendir(".");
long long int total =0;
// printf("reached here 2\n");
if (dr == NULL) // opendir returns NULL if couldn't open directory
{
perror("ls :");
return 1;
}
// for readdir()
while ((de = readdir(dr)) != NULL){
// first we see if we need to print it
if( !(!flag_a && de->d_name[0]=='.') ){
if(flag_l){
struct stat a;
stat(de->d_name, &a);
total += a.st_blocks;
}
}
}
total = total/2;
printf("total %lld\n",total);
// printf("flag_l : %d, flag_a : %d\n",flag_l,flag_a);
closedir(dr);
return 0;
}
int print_it(int flag_a, int flag_l ){
struct dirent *de;
DIR *dr = opendir(".");
// printf("reached here 2\n");
if (dr == NULL) // opendir returns NULL if couldn't open directory
{
perror("ls :");
return 1;
}
// for readdir()
while ((de = readdir(dr)) != NULL){
// first we see if we need to print it
if( !(!flag_a && de->d_name[0]=='.') ){
if(flag_l){
// checks if its a directory and if it is, then it prints a d else prints a -
check_if_dir(de->d_name);
// prints permissions
print_permissions(de->d_name);
printf("\t");
// prints the number of hard links
print_hardlinks(de->d_name);
// print username and groupname
print_user_group(de->d_name);
// print size of file
print_size(de->d_name);
// print date of last modification
print_date(de->d_name);
}
//if we need l then each one gets it's own thing
// if(flag_l){
printf("%s\n", de->d_name);
// printf("\n");
// }
// else{
// printf("%s\t", de->d_name);
// printf("\t");
// }
}
}
printf("\n");
// printf("flag_l : %d, flag_a : %d\n",flag_l,flag_a);
closedir(dr);
return 0;
}
int list(char* path[], int n,char* starting_working_directory){
// Pointer for directory entry
char starting_working[1024];
getcwd(starting_working, sizeof(starting_working));
// printf("what the fuck\n");
int flag_a = 0;
int flag_l= 0;
int valid = 1;
// update flag_a, flag_l for each argument
for(int i=1;i<n;i++){
check_la(&flag_l,&flag_a,i,path);
}
int direct_given = 0;
for(int i=1;i<n;i++){
int path_len = strlen(path[i]);
int to_exec = 1;
if(check_if_path(i,path)){
// printf("reached here\n");
direct_given = 1;
char* okay[2];
okay[1] = path[i];
to_exec = change_dir(okay,2,starting_working_directory);
}
// printf("%d\n",to_exec);
if(to_exec==0){
// opendir() returns a pointer of DIR type.
printf("info for : %s\n",path[i]);
if(flag_l){
size_of( flag_a, flag_l );
}
print_it( flag_a, flag_l);
chdir(starting_working);
}
}
// printf("%d\n",direct_given);
if(direct_given==0){
if(flag_l){
size_of( flag_a, flag_l );
}
print_it( flag_a, flag_l);
chdir(starting_working);
}
return 0;
};