#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(void)
{
  int diceRolls[5], c, i, s, del, choice;
  char buffer[4096];

  printf("\nPlease enter dice values:\n> ");
  fgets(buffer, sizeof (buffer), stdin);

  del=0;
  for (i=0;buffer[i]!='\n' && buffer[i]!='\0';i++) {
    if (buffer[i] == ' ') {
      del=0;
    } else if (buffer[i] < '0' || buffer[i] > '9' || del) {
      printf("\nIncorrect Input Format.\n");
      exit(1);
    }
    if (buffer[i] != ' ') {
      del=1;
    }
  }

  for (i=0;buffer[i]!='\n' && buffer[i]!='\0';i++) {
    if ('0' <= buffer[i] && buffer[i] <= '9') {
      if (buffer[i] < '1' || buffer[i] > '6') {
      printf("\nValue Out of Range.\n");
      exit(1);
      }
    }
  }

  c=0;
  for (i=0;buffer[i]!='\n' && buffer[i]!='\0';i++) {
    if ('1' <= buffer[i] && buffer[i] <= '6') {
      diceRolls[c] = buffer[i] - '0';
      c++;
    }
  }
  if (c!=5) {
    printf("\nIncorrect Number of Values.\n");
    exit(1);
  }

  printf("\n\nPlease choose:\n"
         " 1 -> Reroll some dice\n"
         " 2 -> Reroll all dice\n"
         " 3 -> Keep dice\n");

  printf("> \n");

  fgets(buffer, sizeof (buffer), stdin);
  s = strlen(buffer);
  if (s > 0 && buffer[s-1] == '\n') {
    buffer[s] = '\0';
  }

  return 0;
}