[Help] C Shell Console in linux

[claww]

Hello,

 

i have to create a project  C Shell console in linux i have it but one of requirements is to create the history, like when you press arrows up/down to show last commands used

 

 

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <termios.h>
#include <poll.h>

#define MAX_LINE 80 
#define BUFFER_SIZE 50
#define buffer "\n\nIstoricul comenzilor:\n"

char history[10][bUFFER_SIZE];
int count = 0;
int caught = 0;

void printHistory()
   {
     int i;
     int j = 0;
     int hcount = count;
     for (i=0;i<10;i++)
       {
         printf("%d. ", hcount);
         while (history[i][j] != '\n' && history[i][j] != '\0')
   	   {
             printf("%c", history[i][j]);
             j++;
           }
         printf("\n");
         j = 0;
         hcount--;
         if (hcount ==  0)
         break;
       }
     printf("\n");
     printf(" SHELL:~$ ");
     fflush(stdout);
   }  
void handle_SIGINT()
   {
     write(STDOUT_FILENO,buffer,sizeof(buffer));
     printHistory();
     caught = 1;
   }
void setup(char inputBuffer[], char *args[],int *background)
   {
     int length,
     i,    
     start, 
     ct;    
     ct = 0; 
     length = read(STDIN_FILENO, inputBuffer, MAX_LINE);
     if (caught == 1)
       {
         length = read(STDIN_FILENO, inputBuffer, MAX_LINE);
         caught = 0;
       }
     for (i = 9;i>0; i--)
     strcpy(history[i], history[i-1]);
     strcpy(history[0],inputBuffer);
     count++;
     start = -1;
     if (length == 0)
     exit(0);           
     if (length < 0)
       {
         perror("comanda nu poate fi citita\n");
         exit(-1);       
       }
     for (i=0;i<length;i++)
       {
         switch (inputBuffer[i])
           {
             case ' ':
             case '\t' :               
             if(start != -1)
               {
                 args[ct] = &inputBuffer[start];   
	 ct++;
       }
             inputBuffer[i] = '\0'; 
     start = -1;
     break;
             case '\n':                
             if (start != -1)
       {
                 args[ct] = &inputBuffer[start];
	 ct++;
        }
              inputBuffer[i] = '\0';
              args[ct] = NULL; 
      break;
      default :           
      if (start == -1)
      start = i;
              if (inputBuffer[i] == '&')
	{
          *background  = 1;
                  inputBuffer[i] = '\0';
	 }
      }
        }

     args[ct] = NULL; 
   }

int main(void)
   {
     char inputBuffer[MAX_LINE]; 
     int background;            
     char *args[MAX_LINE/+1];
	    unsigned char line[128];
    unsigned int count = 0;
    int ret;
     pid_t pid;
     int i;

     printf("              \n\n                  #====================================#\n");
     printf("                  #         Sisteme de Operare         #\n");
     printf("                  #             Linux Shell            #\n");
     printf("                  #                                                #\n");
     printf("                  #====================================#\n\n");
     struct sigaction handler;
     handler.sa_handler = handle_SIGINT;
     sigaction(SIGINT, &handler, NULL);

     while (1)
       {            
         background = 0;
         printf("\n SHELL:~$  ");
         setup(inputBuffer,args,&background);  

         pid = fork();
         if (pid < 0)
           {
             printf("Fork fail.\n");
     exit (1);
   }   
  else if (pid == 0)
            {
              if (execvp (args[0], args) == -1)
              printf("Comanda nu poate fi executata\n");
             }
   else
             {
       if (background == 0)
       wait(NULL);
     }
 }
    }

 

anyone can help me to implement history with key arrows  to show last command used ?  i have an kind on history by pressing ctrl+c is show all last used commands but is not good.. 

 

 

Thanks

[United]

Can you just make it read from bash history. Like same as when you type "history" but use tail?

[claww]

Can you just make it read from bash history. Like same as when you type "history" but use tail?

 

i think require readline and i dont know how to do with it