#include <stdio.h>
#include <stdlib.h>
#define  bfsize 100

int main(int argc, char **argv)
{
   shell();

    return 0;
}
void shell(void)
{
  char *command;
  char **arguments;
  int status;

  do {
    printf("> ");
    command = readcommand();
    arguments = splitcommand(command);
    status = shellexecution(arguments);

    free(command);
    free(arguments);
  } while (status);
}
char *readcommand(void)
{
  char *command = NULL;
  size_t buffersize = 0;
  getline(&command, &buffersize, stdin);
  return command;
}
char **splitcommand(char *command)
{
  int buffersize = bfsize ;
   i = 0;
  char **tokens = malloc(buffersize * sizeof(char*));
  char *token;

  if (!tokens) {
    printf("An error occured \n");
    exit(1);
  }

  token = strtok(line, bfsize);
  while (token != NULL) {
    tokens[i] = token;
    i++;

    if (i >= buffersize) {
      buffersize = buffersize + bfsize;
      tokens = realloc(tokens, buffersize * sizeof(char*));
      if (!tokens) {
        printf("An error occured\n");
        exit(1);
      }
    }

    token = strtok(NULL, bfsize);
  }
  tokens[i] = NULL;
  return tokens;
}
int shellexecution(char **args)
{
  pid_t pid;
  pid_t wpid;
  int status;

  pid = fork();
  if (pid == 0) {
    if (execvp(args[0], args) == -1) {
      printf("An error occured \n");
    }
    exit(1);
  } else if (pid < 0) {
   printf("An error occured \n");
  } else {
    do {
      wpid = waitpid(pid, &status, WUNTRACED);
    } while (!WIFEXITED(status) && !WIFSIGNALED(status));
  }

  return 1;
}