slip10_2.c

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <unistd.h>
void make_toks(char *s, char *tok[])
{
int i=0;
char *p;
p = strtok(s," ");
while(p!=NULL)
{ tok[i++]=p;p=strtok(NULL," ");
}
tok[i]=NULL;
}
void list(char *dn, char op)
{
DIR *dp;
struct dirent *entry;
int dc=0,fc=0;
dp = opendir(dn);
if(dp==NULL)
{
printf("Dir %s not found.\n",dn);
return;
}
switch(op)
{
case 'f':
while(entry=readdir(dp))
{
if(entry->d_type==DT_REG)
printf("%s\n",entry->d_name);
} break;
case 'n':
while(entry=readdir(dp))
{
if(entry->d_type==DT_DIR) dc++;
if(entry->d_type==DT_REG) fc++;
}
printf("%d Dir(s)\t%d File(s)\n",dc,fc);
break;
case 'i':
while(entry=readdir(dp))
{
if(entry->d_type==DT_REG)
printf("%s\t%lu\n",entry->d_name,entry->d_fileno);
}
}
closedir(dp);
}
int main() {
char buff[80],*args[10];
int pid;
while(1)
{
printf("myshell$");
fflush(stdin);
fgets(buff,80,stdin);
buff[strlen(buff)-1]='\0';
make_toks(buff,args);
if(strcmp(args[0],"list")==0)
list(args[2],args[1][0]);
else{
pid = fork();
if(pid>0)
wait();
else
{
if(execvp(args[0],args)==-1)
printf("Bad command.\n");
}
}
}
return 0;
}