Somma numeri

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

#define NCIFRE 1000
#define STRLNG 1024

typedef unsigned* punsigned;
typedef FILE* pfile;

void main(void)
 {
   punsigned cifre;
   char      s[STRLNG];
   pfile     add;
   unsigned  i, j, c=1, tmp, lastdigit=0, n_addendi=0;
   int       k;

   if((add=fopen("addendi.txt","r"))==NULL)
    {
      printf("Errore aperture file");
      goto exiterror;
    }

   if((cifre=(punsigned)malloc(NCIFRE*sizeof(unsigned)))==NULL)
    {
     printf("Errore allocazio memoria");
     goto exiterror;
    }

   for(i=0;i<NCIFRE;i++)
    {
     cifre[i]=0;
    }
   i=0;
   do
    {
     fscanf(add,"%s",s);
     switch(s[0])
      {
       case '1':
       case '2':
       case '3':
       case '4':
       case '5':
       case '6':
       case '7':
       case '8':
       case '9':
                printf("%d",tmp=(unsigned)(s[0]-'0'));
                cifre[i]+=tmp;
                j=i;
                while(cifre[j]>=10)
                 {
                  cifre[j++]-=10;
                  if(j>NCIFRE)
                   {
                    printf("\nErrore memoria");
                    goto exiterror;
                   }
                  else
                   {
                    cifre[j]+=1;
                   }
                 }
                if(j>lastdigit) lastdigit=j;
                if((++i)>NCIFRE)
                 {
                  printf("\nErrore memoria");
                  goto exiterror;
                 }
                break;
       case 'e':
                printf("\n");
                i=0;
                n_addendi++;
                break;
       case 's':
                c=0;
                break;
      }
    }while(c);

    fclose(add);

    printf("\n");
    printf("La somma totale e' pari a: ");
    for(k=lastdigit;k>=0;k--)
     {
      printf("%d",cifre[k]);
     }
    printf("\nAddendi letti: %d\n\n",n_addendi);

    free(cifre);

    exiterror: ;
 }