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ls.c
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ls.c
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#include "headers.h"
// function to handle when lflag is one
void detailedPrint(char filename[], char printableFilename[])
{
struct passwd *pws;
struct group *grp;
int x;
int tm_sec = 1;
char time[50] = {'\0'};
struct stat st = {0};
stat(filename, &st);
x = st.st_mode;
// checking if file is directory or link or a file
if(S_ISDIR(x))
printf("d");
else if(S_ISREG(x))
printf("-");
else
printf("l");
// checking read/write/execute permissions for user/group/others
if(x & S_IRUSR)
printf("r");
else
printf("-");
if(x & S_IWUSR)
printf("w");
else
printf("-");
if(x & S_IXUSR)
printf("x");
else
printf("-");
if(x & S_IRGRP)
printf("r");
else
printf("-");
if(x & S_IWGRP)
printf("w");
else
printf("-");
if(x & S_IXGRP)
printf("x");
else
printf("-");
if(x & S_IROTH)
printf("r");
else
printf("-");
if(x & S_IWOTH)
printf("w");
else
printf("-");
if(x & S_IXOTH)
printf("x ");
else
printf("- ");
// getting username and group owner name
pws = getpwuid(st.st_uid);
grp = getgrgid(st.st_gid);
// getting last modified time and converting it to appropriate format
strftime(time, sizeof(time), "%b %d %H:%M", localtime(&st.st_mtime)); // localtime converts datatype time_t to tm and strftime converts it into required format
printf("%d %s %s %d %s %s\n",(int)st.st_nlink, pws -> pw_name, grp -> gr_name, (int)st.st_size, time, printableFilename);
return;
}
void print(char *name, int aflag, int lflag)
{
int isDirectory = 0;
struct stat st = {0};
if(name == NULL)
name = ".";
// checking if name consists name of a directory or a file
stat(name, &st);
if(S_ISDIR(st.st_mode))
isDirectory = 1;
if(isDirectory)
{
char duplicate[PATH_MAX] = {'\0'};
DIR *d;
struct dirent *dir;
// if last character is not '/' then appending string with '/'
if(name[strlen(name) - 1] != '/')
{
int sz = strlen(name);
char * newname = malloc(sz + 2);
strcpy(newname, name);
newname[sz] = '/';
newname[sz + 1] = '\0';
name = newname;
}
strcpy(duplicate, name);
d = opendir(name);
if(d && lflag == 0)
{
while ((dir = readdir(d)) != NULL)
if((dir -> d_name[0] == '.' && aflag == 1) || (dir -> d_name[0] != '.')) // if hidden then show only if aflag is one
printf("%s\n", dir->d_name);
closedir(d);
}
else if(d && lflag == 1)
{
while((dir = readdir(d)) != NULL)
{
if((dir -> d_name[0] == '.' && aflag == 1) || (dir -> d_name[0] != '.'))
{
strcat(duplicate, dir -> d_name);
detailedPrint(duplicate, dir -> d_name);
strcpy(duplicate, name);
}
}
}
}
else
{
if(lflag == 0)
printf("%s\n", name);
else
detailedPrint(name, name);
}
return;
}
void shell_ls(char **commands, char HOME_DIRECTORY[])
{
int aflag = 0;
int lflag = 0;
char tempArray[15][PATH_MAX] = {'\0'};
int i = 0;
int length;
int c;
extern char *optarg;
extern int optind;
int flag = 0;
optind = 0;
while(commands[i]!=NULL)
i++;
length = i;
// using getopt to detect whether -l or -a flags are used in command
while((c = getopt(length, commands, "la")) != -1)
{
switch (c)
{
case 'a':
aflag = 1;
break;
case 'l':
lflag = 1;
break;
case '?':
return;
}
}
// checking for each word in command and if it is directory/file/link then printing info about it
for(i = 0;i < length;i++)
{
if(strcmp(commands[i], "ls") && (commands[i][0] != '-' || strlen(commands[i]) == 1))
{
char realPath[PATH_MAX] = {'\0'};
convert_to_tilda(HOME_DIRECTORY, commands[i], realPath);
flag = 1;
struct stat st = {0};
int x = stat(realPath, &st);
if(x < 0)
printf("ls: cannot access '%s': No such file or directory\n", commands[i]);
else
{
printf("%s:\n", commands[i]);
print(realPath, aflag, lflag);
}
}
}
// if no directory/file/link name is written after ls then printing info about all files in current directory
if(flag == 0)
print(NULL, aflag, lflag);
return;
}