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ls.c
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#include "headers.h"
#include "updir.h"
//account for special files
int print_file_permissions(char *path, char *file_name)
{
struct stat buffer;
stat(path, &buffer);
if (S_ISDIR(buffer.st_mode))
{
printf("d");
}
else
{
printf("-");
}
if (buffer.st_mode & S_IRUSR)
{
printf("r");
}
else
{
printf("-");
}
if (buffer.st_mode & S_IWUSR)
{
printf("w");
}
else
{
printf("-");
}
if (buffer.st_mode & S_IXUSR)
{
printf("x");
}
else
{
printf("-");
}
if (buffer.st_mode & S_IRGRP)
{
printf("r");
}
else
{
printf("-");
}
if (buffer.st_mode & S_IWGRP)
{
printf("w");
}
else
{
printf("-");
}
if (buffer.st_mode & S_IXGRP)
{
printf("x");
}
else
{
printf("-");
}
if (buffer.st_mode & S_IROTH)
{
printf("r");
}
else
{
printf("-");
}
if (buffer.st_mode & S_IWOTH)
{
printf("w");
}
else
{
printf("-");
}
if (buffer.st_mode & S_IXOTH)
{
printf("x");
}
else
{
printf("-");
}
printf("%*ld", 4, buffer.st_nlink);
uid_t uid = buffer.st_uid;
gid_t gid = buffer.st_gid;
struct passwd *f;
f = getpwuid(uid);
// if(f!=NULL)
printf("%*s", 15, f->pw_name);
struct group *g;
g = getgrgid(gid);
printf("%*s", 15, g->gr_name);
long int size = buffer.st_size;
printf("%*ld", 8, size);
time_t now;
time(&now);
struct tm *tm = localtime(&(buffer.st_ctime));
int then_month = tm->tm_mon;
int then_date = tm->tm_mday;
char with_time[20];
char with_year[20];
strftime(with_year, 20, "%b %e %Y", tm);
strftime(with_time, 20, "%b %e %R", tm);
struct tm *now_info = localtime(&now);
//for files more than 6 months old, display year instead of time
if (now_info->tm_mon - then_month > 6)
{
printf(" %s", with_year);
}
else if (now_info->tm_mon - then_month == 6)
{
if (now_info->tm_mday > then_date)
{
printf(" %s", with_year);
}
else
{
printf(" %s", with_time);
}
}
else
{
printf(" %s", with_time);
}
// printf("\t%s", date);
printf(" %s\n", file_name);
}
int ls(char *command, char *home)
{
error_code=0;
// printf("*%s*\n", command);
int l_flag = 0, a_flag = 0, w_flag = 0;
for (int i = 0; i < strlen(command); i++)
{
if (command[i] == '-')
{
if (command[i + 1] == 'l')
{
l_flag = 1;
if (command[i + 2] == 'a')
{
a_flag = 1;
if ((command[i + 3] != ' ' &&command[i+3]!='\t')&& command[i + 3] != '\0')
{
w_flag = 1;
}
}
else if ((command[i + 2] != ' '&&command[i+2]!='\t') && command[i + 2] != '\0')
{
w_flag = 1;
}
}
else if (command[i + 1] == 'a')
{
a_flag = 1;
if (command[i + 2] == 'l')
{
l_flag = 1;
if (command[i + 3] != ' ' &&command[i+3]!='\t' && command[i + 3] != '\0')
{
w_flag = 1;
}
}
else if (command[i + 2] != ' ' &&command[i+2]!='\t' && command[i + 2] != '\0')
{
w_flag = 1;
}
}
else
{
w_flag = 1;
}
}
}
// printf("l_flag: %d\na_flag: %d\nw_flag: %d\n", l_flag, a_flag,w_flag);
char dir_list[1024][1024];
char file_list[1024][1024];
int file_count = 0;
int word_count = 0;
int n_word = 0;
int n_char = 0;
int req_count = 0;
for (int i = 0; i < strlen(command); i++)
{
// printf("word_count: %d\n", word_count);
if (command[i] != ' ' && command[i]!='\t')
{
if (i + 2 < strlen(command) + 1 && (command[i] == 'l' && command[i + 1] == 's' && (command[i + 2] == ' ' || command[i + 2] == '\0'|| command[i+2]=='\t')))
{
i = i + 2;
}
else if (command[i] == '-')
{
while (command[i] != ' ' && command[i]!='\t' && command[i] != '\0')
{
i++;
}
}
else
{
int k = i;
if (command[i] == '~')
{
for (int y = 0; y < strlen(home); y++)
{
dir_list[n_word][n_char] = home[y];
n_char++;
}
k++;
}
while (command[k] != ' ' && command[i]!='\t' && command[k] != '\0')
{
dir_list[n_word][n_char] = command[k];
k++;
n_char++;
}
i = k;
n_word++;
n_char = 0;
word_count++;
req_count++;
struct stat buffer;
int exist = stat(dir_list[n_word - 1], &buffer);
if (exist == -1)
{
error_code=1;
fprintf(stderr, "ls: %s cannot be accessed: No such file/directory.\n", dir_list[n_word - 1]);
memset(dir_list[n_word - 1], 0, strlen(dir_list[n_word - 1]));
n_word--;
word_count--;
}
else
{
if (S_ISDIR(buffer.st_mode))
{
int read_acc = access(dir_list[n_word - 1], R_OK);
if (read_acc == -1)
{
error_code=1;
fprintf(stderr, "ls: %s cannot be accessed: Read permission denied.\n", dir_list[n_word - 1]);
memset(dir_list[n_word - 1], 0, strlen(dir_list[n_word - 1]));
n_word--;
word_count--;
}
}
else
{
strcpy(file_list[file_count], dir_list[n_word - 1]);
file_count++;
memset(dir_list[n_word - 1], 0, strlen(dir_list[n_word - 1]));
n_word--;
word_count--;
}
}
}
}
}
// for (int i = 0; i < word_count; i++)
// {
// printf("word: %s\n", dir_list[i]);
// }
if (req_count == 0)
{
dir_list[0][0] = '.';
dir_list[0][1] = '\0';
word_count++;
}
// printf("word_count: %d\n", word_count);
// for(int i=0;i<word_count;i++)
// {
// printf("*%s*\n", dir_list[i]);
// }
if (w_flag == 1)
{
error_code=1;
fprintf(stderr, "Wrong flag\n");
}
else
{
if (l_flag == 0 && a_flag == 0)
{
for (int i = 0; i < file_count; i++)
{
printf("%s ", file_list[i]);
}
if (file_count > 0)
{
printf("\n");
}
if (word_count > 0 && file_count > 0)
{
printf("\n");
}
for (int i = 0; i < word_count; i++)
{
if (req_count >= 2)
{
printf("%s:\n", dir_list[i]);
}
struct dirent **entry;
int count = scandir(dir_list[i], &entry, NULL, alphasort);
for (int j = 0; j < count; j++)
{
if (entry[j]->d_name[0] != '.')
{
printf("%s ", entry[j]->d_name);
}
}
printf("\n");
if (req_count >= 2 && i != word_count - 1)
{
printf("\n");
}
}
}
else if (l_flag == 0 && a_flag == 1)
{
for (int i = 0; i < file_count; i++)
{
printf("%s ", file_list[i]);
}
if (file_count > 0)
{
printf("\n");
}
if (word_count > 0 && file_count > 0)
{
printf("\n");
}
for (int i = 0; i < word_count; i++)
{
if (req_count >= 2)
{
printf("%s:\n", dir_list[i]);
}
struct dirent **entry;
int count = scandir(dir_list[i], &entry, NULL, alphasort);
for (int j = 0; j < count; j++)
{
printf("%s ", entry[j]->d_name);
}
printf("\n");
if (req_count >= 2 && i != word_count - 1)
{
printf("\n");
}
}
}
else if (l_flag == 1 && a_flag == 0)
{
for (int i = 0; i < file_count; i++)
{
print_file_permissions(file_list[i], file_list[i]);
}
if (word_count > 0 && file_count > 0)
{
printf("\n");
}
for (int i = 0; i < word_count; i++)
{
if (req_count >= 2)
{
printf("%s:\n", dir_list[i]);
}
struct dirent **entry;
int count = scandir(dir_list[i], &entry, NULL, alphasort);
int total = 0;
for (int j = 0; j < count; j++)
{
if (entry[j]->d_name[0] != '.')
{
char file_path[1024];
sprintf(file_path, "%s/%s", dir_list[i], entry[j]->d_name);
struct stat s;
stat(file_path, &s);
total = total + s.st_blocks;
}
}
printf("total %d\n", total / 2);
total = 0;
for (int j = 0; j < count; j++)
{
if (entry[j]->d_name[0] != '.')
{
char file_path[1024];
sprintf(file_path, "%s/%s", dir_list[i], entry[j]->d_name);
print_file_permissions(file_path, entry[j]->d_name);
}
}
if (req_count >= 2 && i != word_count - 1)
{
printf("\n");
}
}
}
else if (l_flag == 1 && a_flag == 1)
{
for (int i = 0; i < file_count; i++)
{
print_file_permissions(file_list[i], file_list[i]);
}
if (word_count > 0 && file_count > 0)
{
printf("\n");
}
for (int i = 0; i < word_count; i++)
{
if (req_count >= 2)
{
printf("%s:\n", dir_list[i]);
}
struct dirent **entry;
int count = scandir(dir_list[i], &entry, NULL, alphasort);
int total = 0;
for (int j = 0; j < count; j++)
{
char file_path[1024];
sprintf(file_path, "%s/%s", dir_list[i], entry[j]->d_name);
struct stat s;
stat(file_path, &s);
total = total + s.st_blocks;
}
printf("total %d\n", total / 2);
total = 0;
for (int j = 0; j < count; j++)
{
char file_path[1024];
sprintf(file_path, "%s/%s", dir_list[i], entry[j]->d_name);
print_file_permissions(file_path, entry[j]->d_name);
}
if (req_count >= 2 && i != word_count - 1)
{
printf("\n");
}
}
}
}
for (int i = 0; i < word_count; i++)
{
memset(dir_list[i], 0, strlen(dir_list[i]));
}
for (int i = 0; i < file_count; i++)
{
memset(file_list[i], 0, strlen(file_list[i]));
}
}