Program:
//
Server : strs.c
#include<stdio.h>
#include<string.h>
#include<sys/stat.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<stdlib.h>
main ()
{
struct sockaddr_in client,server;
int s,sock,found,sz,choice=0,ack=0;
char buffer[20],string[20],substring[20];
FILE *fp,*temp;
s=socket(AF_INET,SOCK_STREAM,0);
server.sin_family=AF_INET;
server.sin_port=2000;
server.sin_addr.s_addr=inet_addr("127.0.0.1");
sz=sizeof(client);
bind(s,(struct sockaddr *)&server,sizeof(server));
listen(s,1);
sock=accept(s,(struct sockaddr *)&client,&sz);
recv(sock,string,sizeof(string),0);
printf("String recieved: %s",string);
found=0;
if((fp=fopen("testrecord.txt","r"))==NULL)
{
printf("! The file is empty...\n");
send(sock,&found,sizeof(int),0);
}
else
{
while(!feof(fp)&&found==0)
{
fscanf(fp,"%s",buffer);
if(strcmp(buffer,string)==0)
{
found=1;
printf("\nThe record found.\n");
}
}
send(sock,&found,sizeof(int),0);
fclose(fp);
}
recv(sock,&choice,sizeof(int),0);
if(choice)
{
recv(sock,substring,sizeof(substring),0);
printf("\nString Replacement:\nSubstring: %s",substring);
temp=fopen("temp.txt","w");
if((fp=fopen("testrecord.txt","r"))==NULL)
{
printf("! The file is empty...\n");
send(sock,&ack,sizeof(int),0);
}
else
{
while(!feof(fp))
{
fscanf(fp,"%s",buffer);
if(strcmp(buffer,string)==0)
{
fprintf(temp,"%s ",substring);
ack=1;
}
else
{
fprintf(temp,"%s ",buffer);
}
}
send(sock,&ack,sizeof(int),0);
}
fclose(fp);
fclose(temp);
remove("testrecord.txt");
rename("temp.txt","testrecord.txt");
remove("temp.txt");
}
else
{
printf("\nNo replacement... \n");
exit(0);
}
close(sock);
close(s);
}
//
Client: strc.c
#include<stdio.h>
#include<string.h>
#include<sys/stat.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<stdlib.h>
main()
{
struct sockaddr_in client;
int s,found=0,choice=0,ack=0;;
char buffer[20],string[20],substring[20];
s=socket(AF_INET,SOCK_STREAM,0);
client.sin_family=AF_INET;
client.sin_port=2000;
client.sin_addr.s_addr=inet_addr("127.0.0.1");
connect(s,(struct sockaddr *)&client,sizeof(client));
printf("Enter a string to search in server:");
scanf("%s",string);
send(s,&string,sizeof(string),0);
recv(s,&found,sizeof(int),0);
if(found)
{
printf("\nThe record found.");
}
else
{
printf("\nNot found...\n");
exit(0);
}
printf("\nDo you want to replace it ?\nEnter 1 -> Yes 2 -> No\n");
scanf("%d",&choice);
send(s,&choice,sizeof(int),0);
if(choice)
{
printf("\nSubstring: ");
scanf("%s",substring);
send(s,&substring,sizeof(substring),0);
recv(s,&ack,sizeof(int),0);
if(ack)
{
printf("\nSuccess... \n");
}
else
{
printf("\nError... \n");
}
}
else
{
printf("\nThanks... ");
exit(0);
}
close(s);
}
//
testrecord.txt
BAJAJ YAMAHA HONDA HEROHONDA TVS SUZUKI
Output:
Terminal 1: (Server)
nn@linuxmint ~ $ gcc strs.c -o server
nn@linuxmint ~ $ ./server
String recieved: HEROHONDA
The record found.
String Replacement:
Substring: HEROnn@linuxmint ~ $
Terminal 2: (Client)
nn@linuxmint ~ $ gcc strc.c -o client
nn@linuxmint ~ $ ./client
Enter a string to search in server:HEROHONDA
The record found.
Do you want to replace it ?
Enter 1 -> Yes 2 -> No
1
Substring: HERO
Success... nn@linuxmint ~ $
//
testrecord.txt
BAJAJ YAMAHA HONDA HERO TVS SUZUKI
