Academic-Shell-System/Lec_Shell.c at main · levleyfer/Academic-Shell-System · GitHub

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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/stat.h>

void Error(char* msg) {
    perror(msg);
    exit(1);
}

int main(int argc ,char* argv[]) {

//////////////////////// Initializing ///////////////

   char buff[100];
   char *scan,*id,*code,*name,*day,*hour_s,*hour_f;
   int fd,ids,rbytes;

   memset(buff, 0, sizeof(buff));

////////////////// lecturer funcs /////////////////////

   while(1==1){

     printf("LecShell> ");
     fflush(stdout);
     rbytes = read(STDIN_FILENO, buff, 100);
     if(rbytes == -1){
        Error("ERROR: failed to read");
     }
     buff[strlen(buff)-1] = '\0';  // remove newline character
     scan=strtok(buff," ");
     if(rbytes == -1){
        Error("failed to read\n");
     }
     if (strcmp(scan,"SetCourses")==0){
       code=strtok(NULL," ");
       name=strtok(NULL," ");
       day=strtok(NULL," ");
       hour_s=strtok(NULL," ");
       hour_f=strtok(NULL," ");
       if(code== NULL || name == NULL || day == NULL || hour_s==NULL || hour_f==NULL){
         printf("missing parameters!\n");
         continue;
       }

       if ( ( ids = fork() ) == 0 ){
         execl("/home/braude/SetCourses","SetCourses",code,name,day,hour_s,hour_f,NULL);
         Error("failed execv SetCourses\n");
       }
       wait();
     }

     else if (strcmp(scan,"GetSchedule")==0){
       id=strtok(NULL," ");

       if ( ( ids = fork() ) == 0 ){
         execl("/home/braude/GetSchedule","GetSchedule",id,NULL);
         Error("failed execv GetSchedule\n");
       }
       wait();
     }

     else if (strcmp(scan,"DeleteStudent")==0){
       id=strtok(NULL," ");
       if ( ( ids = fork() ) == 0 ){
         execl("/home/braude/DeleteStudent","DeleteStudent",id,NULL);
         Error("failed execv DeleteStudent\n");
       }
       wait();
     }

     else if (strcmp(scan,"Freeze")==0){
       id=strtok(NULL," ");
       if ( ( ids = fork() ) == 0 ){
         execl("/home/braude/Freeze","Freeze",id,NULL);
         Error("failed execv Freeze\n");
       }
       wait();
     }

     else if (strcmp(scan,"Approve")==0){
       id=strtok(NULL," ");
       if ( ( ids = fork() ) == 0 ){
         execl("/home/braude/Approve","Approve",id,NULL);
         Error("failed execv Approve\n");
       }
       wait();
     }

     else if (strcmp(scan,"ShowCourses")==0){
       if ( ( ids = fork() ) == 0 ) {
         execl("/home/braude/ShowCourses","ShowCourses",NULL);
         Error("failed execl ShowCourses\n");
       }
       wait();
     }

     else if (strcmp(scan,"LogOut")==0){
       execl("/home/braude/LogOut",NULL);
       Error("failed execv LogOut\n");
     }
     else
       printf("Not Supported\n");

     memset(buff, 0, sizeof(buff));
 }
 return 0;
}