QUIZ II Operating System (CLIENT)

// LINK SOAL : https://www.dropbox.com/sh/wussgfrqrmazf9g/AADnp_e-zKkHZWXyAFDQ5yJFa?dl=0
// LINK TEMPLATE : http://pastebin.com/Rc7A08xG

#include <stdio.h>
#include <sys/ipc.h>
#include <sys/types.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

struct data{
    char s_name[31];
    char s_address[51];
    char r_name[31];
    char r_address[51];
    char i_name[16];
    float weight;
    char type[10];
};

int main(){
    struct sembuf s;
    int h=shmget(123456,sizeof(struct data),IPC_CREAT|0666);//h=shmid
    int e=semget(123456,1,IPC_CREAT|0666);//e=semid
    semctl(e,0,SETVAL,0);
    struct data *deliv=(struct data*)shmat(h,NULL,0666);
    printf("SNE Delivery Service - Client\n\n");
    int flag=0,flagStreet=0,i;
    do{
        do{
            flag=0;
            printf("Sender Name [5..30 chars][\"exit\" to quit] : ");
            scanf("%[^\n]",deliv->s_name);getchar();
            if(strlen(deliv->s_name)>=5&&strlen(deliv->s_name)<=30)
                flag=1;
            else if(strcasecmp("Exit",deliv->s_name)==0)
                break;
        }while(flag==0);
        if(strcasecmp("Exit",deliv->s_name)!=0){
        do{
            flag=0;
            flagStreet=0;
            printf("Sender Address [10..50 chars]: ");
            scanf("%[^\n]",deliv->s_address);getchar();
            if(strlen(deliv->s_address)>=10&&strlen(deliv->s_address)<=50){
                flag=1;
            }
            for(i=0;i<strlen(deliv->s_address);i++){
                if(i+5<strlen(deliv->s_address)&&deliv->s_address[i]=='S'&&deliv->s_address[i+1]=='t'
                    &&deliv->s_address[i+2]=='r'&&deliv->s_address[i+3]=='e'&&deliv->s_address[i+4]=='e'
                    &&deliv->s_address[i+5]=='t'){//logikanya, Street pasti urutan
                    flagStreet=1;
                    break;
                }
            }
        }while(flag==0||flagStreet==0);
        do{
            flag=0;
            printf("Receiver Name [5..30 chars] : ");
            scanf("%[^\n]",deliv->r_name);getchar();
            if(strlen(deliv->r_name)>=5&&strlen(deliv->r_name)<=30)
                flag=1;
        }while(flag==0);
        do{
            flag=0;
            flagStreet=0;
            printf("Receiver Address [10..50 chars]: ");
            scanf("%[^\n]",deliv->r_address);getchar();
            if(strlen(deliv->r_address)>=10&&strlen(deliv->r_address)<=50){
                flag=1;
            }
            for(i=0;i<strlen(deliv->r_address);i++){
                if(i+5<strlen(deliv->r_address)&&deliv->r_address[i]=='S'&&deliv->r_address[i+1]=='t'
                    &&deliv->r_address[i+2]=='r'&&deliv->r_address[i+3]=='e'&&deliv->r_address[i+4]=='e'
                    &&deliv->r_address[i+5]=='t'){
                    flagStreet=1;
                    break;
                }
            }
        }while(flag==0||flagStreet==0);
        do{
            flag=0;
            printf("Item Name [3..15 chars] : ");
            scanf("%[^\n]",deliv->i_name);getchar();
            if(strlen(deliv->i_name)>=3&&strlen(deliv->i_name)<=15)
                flag=1;
        }while(flag==0);
        do{
            flag=0;
            printf("Item Weight [1..20 kg] : ");
            scanf("%f",&deliv->weight);getchar();fflush(stdin);//pake float karena input koma
            if(deliv->weight>=1&&deliv->weight<=20)
                flag=1;
        }while(flag==0);
        do{
            flag=0;
            printf("Delivery Type [Express|Regular] : ");
            scanf("%[^\n]",deliv->type);getchar();
            if(strcmp(deliv->type,"Express")==0||strcmp(deliv->type,"Regular")==0)//HATI! case sensitive
                flag=1;
        }while(flag==0);
        }
        s.sem_num=0;
        s.sem_op=1;
        s.sem_flg=0;
        semop(e,&s,1);
        printf("Input data, press enter\n");
        getchar();
    }while(strcasecmp(deliv->s_name,"exit")!=0);
    shmdt(&deliv);
    shmctl(h,IPC_RMID,0);
    semctl(e,0,IPC_RMID);
}