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builtin_commands.c
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builtin_commands.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include <sys/utsname.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/dir.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <grp.h>
#include <time.h>
#include "config.h"
#include "styles.h"
void pwd() {
char cur_dir[1000];
getcwd(cur_dir, sizeof(cur_dir));
printf("%s\n", cur_dir);
return;
}
void cd(char *dest) {
dest = strtok(NULL, " \t\n\r");
if(dest==NULL || (strcmp(dest,"~")==0) || (strcmp(dest,"~/")==0)) chdir(HOME);
else if((dest[0]=='~') && (dest[1]=='/'))
{
char destination[1000];
strcpy(destination, HOME);
strcat(destination, &dest[1]);
if(chdir(destination)<0) perror("Error");
}
else if(chdir(dest)<0) perror("Error");
return;
}
void echo(char *token) {
token = strtok(NULL, " \t\n\r");
while(token!=NULL)
{
printf("%s ", token);
token = strtok(NULL, " \t\n\r");
}
printf("\n");
return;
}
void ls(char *token) {
token = strtok(NULL, " \t\n\r");
int a_flag = 0;
int l_flag = 0;
char *dirs[2000];
int count = 0;
int i, j, k;
while(token!=NULL)
{
if(strcmp(token, "-a")==0) a_flag = 1;
else if(strcmp(token, "-l")==0) l_flag = 1;
else if(strcmp(token, "-la")==0 || strcmp(token, "-al")==0) {a_flag = 1; l_flag = 1;}
else dirs[count++] = token;
token = strtok(NULL, " \t\n\r");
}
if(count==0) dirs[count++] = token;
// Iterating through the directories on which we do ls
for(i=0; i<count; ++i)
{
char dir[1000];
// Check for home
if(dirs[0]==NULL)
{
char present_dir[1000];
getcwd(present_dir, sizeof(present_dir));
strcpy(dir, present_dir);
}
else if((strcmp(dirs[i],"~")==0) || (strcmp(dirs[i],"~/")==0)) strcpy(dir, HOME);
else if((dirs[i][0]=='~') && (dirs[i][1]=='/'))
{
strcpy(dir, HOME);
strcat(dir, &(dirs[i])[1]);
}
else strcpy(dir, dirs[i]);
// ls on the current directory
DIR* cur_dir = opendir(dir);
struct dirent *files;
struct stat filestat;
if(cur_dir)
{
if(i>0) printf("\n");
char buf[512];
while((files = readdir(cur_dir)) != NULL)
{
sprintf(buf, "%s/%s", dir, files->d_name);
stat(buf, &filestat);
if(!l_flag)
{
if(!a_flag)
{
if((files->d_name[0])!='.')
{
if(S_ISDIR(filestat.st_mode)) printf(BOLD BLU "%s " RESET, files->d_name);
else if(filestat.st_mode & S_IXUSR) printf(BOLD GRN "%s " RESET, files->d_name);
else printf("%s ", files->d_name);
}
}
else
{
if(S_ISDIR(filestat.st_mode)) printf(BOLD BLU "%s " RESET, files->d_name);
else if(filestat.st_mode & S_IXUSR) printf(BOLD GRN "%s " RESET, files->d_name);
else printf("%s ", files->d_name);
}
}
else
{
mode_t mode = filestat.st_mode;
char filetype = '?';
if(S_ISREG(mode)) filetype = '-';
if(S_ISLNK(mode)) filetype = 'l';
if(S_ISDIR(mode)) filetype = 'd';
if(S_ISBLK(mode)) filetype = 'b';
if(S_ISCHR(mode)) filetype = 'c';
if(S_ISFIFO(mode)) filetype = '|';
char ur = '-', uw = '-', ux = '-';
char gr = '-', gw = '-', gx = '-';
char or = '-', ow = '-', ox = '-';
if(mode & S_IRUSR) ur = 'r';
if(mode & S_IWUSR) uw = 'w';
if(mode & S_IXUSR) ux = 'x';
if(mode & S_IRGRP) gr = 'r';
if(mode & S_IWGRP) gw = 'w';
if(mode & S_IXGRP) gx = 'x';
if(mode & S_IROTH) or = 'r';
if(mode & S_IWOTH) ow = 'w';
if(mode & S_IXOTH) ox = 'x';
uid_t usr_id = filestat.st_uid;
gid_t grp_id = filestat.st_gid;
struct group *grp = getgrgid(grp_id);
struct passwd *usr = getpwuid(usr_id);
char date[256];
strftime(date, 20, "%b %d %H:%M", localtime(&(filestat.st_mtime)));
if(!a_flag)
{
if((files->d_name[0])!='.')
{
printf("%c%c%c%c%c%c%c%c%c%c\t", filetype, ur, uw, ux, gr, gw, gx, or, ow, ox);
printf("%s\t%s\t", usr->pw_name, grp->gr_name);
printf("%ld\t%s\t", filestat.st_size, date);
if(S_ISDIR(filestat.st_mode)) printf(BOLD BLU "%s\n" RESET, files->d_name);
else if(filestat.st_mode & S_IXUSR) printf(BOLD GRN "%s\n" RESET, files->d_name);
else printf("%s\n", files->d_name);
}
}
else
{
printf("%c%c%c%c%c%c%c%c%c%c\t", filetype, ur, uw, ux, gr, gw, gx, or, ow, ox);
printf("%s\t%s\t", usr->pw_name, grp->gr_name);
printf("%ld\t%s\t", filestat.st_size, date);
if(S_ISDIR(filestat.st_mode)) printf(BOLD BLU "%s\n" RESET, files->d_name);
else if(filestat.st_mode & S_IXUSR) printf(BOLD GRN "%s\n" RESET, files->d_name);
else printf("%s\n", files->d_name);
}
}
}
if(!l_flag) printf("\n");
closedir(cur_dir);
if(dirs[0]==NULL) return;
}
else
{
perror("Error");
continue;
}
}
return;
}