slip.16

1. .......
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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 count(char *fn, char op)
{
int fh,cc=0,wc=0,lc=0;
char c;
fh = open(fn,O_RDONLY);
if(fh==-1)
{
printf("File %s not found.\n",fn);
return;
}
while(read(fh,&c,1)>0)
{
if(c==' ') wc++;
else if(c=='\n')
{
wc++;
lc++;
}
cc++;
}
close(fh);
switch(op)
{
case 'c':
printf("No.of characters:%d\n",cc-1);
break;
case 'w':
printf("No.of words:%d\n",wc);
break;
case 'l':
printf("No.of lines:%d\n",lc+1);
break;
}
}
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],"count")==0)
count(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;
}
Output :
after compile create text file
for text file type vim textfile name.txt ,example : vim info.txt
press i write text in text file press esc :wq
now run program using ./a.out command
myshell$ count c info.txt
No.of characters:45
myshell$ count w info.txt
No.of words:3
myshell$ count l info.txt
No.of lines:3
myshell$
<---info.txt--->
Hello world
Ramayan-Valmiki
Bhagwatgeeta-Vyasa


2........
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
typedef struct process_info
{
char pname[20];
int at,bt,ct,bt1,p;
struct process_info *next;
}NODE;
int n;
NODE *first,*last;
void accept_info()
{
NODE *p;
int i;
printf("Enter no.of process:");
scanf("%d",&n);
for(i=0;i<n;i++)
{
p = (NODE*)malloc(sizeof(NODE));
printf("Enter process name:");
scanf("%s",p->pname);
printf("Enter arrival time:");
scanf("%d",&p->at);
printf("Enter first CPU burst time:");
scanf("%d",&p->bt);
printf("Enter priority:");
scanf("%d",&p->p);
p->bt1 = p->bt;
p->next = NULL;
if(first==NULL)
first=p;
else
last->next=p;
last = p;
}
}
void print_output()
{
NODE *p;
float avg_tat=0,avg_wt=0;
printf("pname\tat\tbt\tp\ttct\ttat\twt\n");
p = first;
while(p!=NULL)
{
int tat = p->ct-p->at;
int wt = tat-p->bt;
avg_tat+=tat;
avg_wt+=wt;
printf("%s\t%d\t%d\t%d\t%d\t%d\t%d\n",
p->pname,p->at,p->bt,p->p,p->ct,tat,wt);
p=p->next;
}
printf("Avg TAT=%f\tAvg WT=%f\n",
avg_tat/n,avg_wt/n);
}
void print_input()
{
NODE *p;
p = first;
printf("pname\tat\tbt\tp\n");
while(p!=NULL)
{
printf("%s\t%d\t%d\t%d\n",
p->pname,p->at,p->bt1,p->p);
p = p->next;
}
}
void sort()
{
NODE *p,*q;
int t;
char name[20];
p = first;
while(p->next!=NULL)
{
q=p->next;
while(q!=NULL)
{
if(p->at > q->at)
{
strcpy(name,p->pname);
strcpy(p->pname,q->pname);
strcpy(q->pname,name);
t = p->at;
p->at = q->at;
q->at = t;
t = p->bt;
p->bt = q->bt;
q->bt = t;
t = p->ct;
p->ct = q->ct;
q->ct = t;
t = p->bt1;
p->bt1 = q->bt1;
q->bt1 = t;
t = p->p;
p->p = q->p;
q->p = t;
}
q=q->next;
}
p=p->next;
}
}
int time;
NODE * get_p()
{
NODE *p,*min_p=NULL;
int min=9999;
p = first;
while(p!=NULL)
{
if(p->at<=time && p->bt1!=0 &&
p->p<min)
{
min = p->p;
min_p = p;
}
p=p->next;
}
return min_p;
}
struct gantt_chart
{
int start;
char pname[30];
int end;
}s[100],s1[100];
int k;
void pnp()
{
int prev=0,n1=0;
NODE *p;
while(n1!=n)
{
p = get_p();
if(p==NULL)
{
time++;
s[k].start = prev;
strcpy(s[k].pname,"*");
s[k].end = time;
prev = time;
k++;
}
else
{
time+=p->bt1;
s[k].start = prev;
strcpy(s[k].pname, p->pname);
s[k].end = time;
prev = time;
k++;
p->ct = time;
p->bt1 = 0;
n1++;
}
print_input();
sort();
}
}
void print_gantt_chart()
{
int i,j,m;
s1[0] = s[0];
for(i=1,j=0;i<k;i++)
{
if(strcmp(s[i].pname,s1[j].pname)==0)
s1[j].end = s[i].end;
else
s1[++j] = s[i];
}
printf("%d",s1[0].start);
for(i=0;i<=j;i++)
{
m = (s1[i].end - s1[i].start);
for(k=0;k<m/2;k++)
printf("-");
printf("%s",s1[i].pname);
for(k=0;k<(m+1)/2;k++)
printf("-");
printf("%d",s1[i].end);
}
}
int main()
{
accept_info();
sort();
pnp();
print_output();
print_gantt_chart();
return 0;
}

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