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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
 
#define F "fichier"
 
 
static void purge(FILE *fp)
{
   int c;
   while ((c = fgetc(fp)) != '\n' && c != EOF)
   {
   }
}
 
static void clean (char *s, FILE *fp)
{
   /* search ... */
   char *p = strchr (s, '\n'); /* <string.h> */
   if (p != NULL)
   {
      /* ... and kill */
      *p = 0;
   }
   else
   {
      purge (fp);
   }
}
 
 
typedef struct {
  char *duoIP[2];
} t_couple;
 
 
int main(void)
{
  int nb = 0 ,size = 5;
  FILE *fp = fopen("voisin","r");
 
  t_couple *tabCouple;
  tabCouple = (t_couple*)malloc(sizeof(t_couple));
  if(tabCouple == NULL)
    {
      printf("erreur allocation\n");
      exit(1);
    }
 
  if (fp != NULL)
    {
      char line[BUFSIZ];
 
      while (fgets(line, sizeof line, fp) != NULL)
	{
	  clean(line, fp);
	  char *p = line;
	  if(nb == size)
	    {
	      size += 16;
 
	      tabCouple = realloc(tabCouple, size * sizeof(t_couple));
	      if (tabCouple == NULL)
		{
		  perror("erreur allocation\n");
		  free(tabCouple); tabCouple = NULL;
		  exit(1);
		}
	    }
 
	  int ip1[4],ip2[4];
	  int n = sscanf(p, "%d.%d.%d.%d,%d.%d.%d.%d", ip1, ip1 + 1, ip1 + 2, ip1 + 3, ip2, ip2 + 1, ip2 + 2, ip2 + 3);
	  if(n == 9)
	    {
	      tabCouple[nb].duoIP[0] = malloc((strlen(ip1)+1) * sizeof(t_couple));
	      if (tabCouple[nb].duoIP[0] == NULL)
		{
		  perror("erreur allocation\n");
		  free(tabCouple); tabCouple = NULL;
		  exit(1);
		}
	      strcpy(tabCouple[nb].duoIP[0],p);
 
	      tabCouple[nb].duoIP[1] = malloc((strlen(ip2)+1) * sizeof(t_couple));
	      if (tabCouple[nb].duoIP[1] == NULL)
		{
		  perror("erreur allocation\n");
		  free(tabCouple); tabCouple = NULL;
		  exit(1);
		}
	      strcpy(tabCouple[nb].duoIP[1],p);
 
	      nb++;
	    }
	  else
	    {
	      printf ("format error\n");
	      break;
	    }
	}
      fclose (fp), fp = NULL;
    }
  else
    {
      perror (F);
    }
  assert (fp == NULL);
 
  int i;
  for(i=0; i<nb; i++)
    printf("couple : %s et %s\n", tabCouple[i].duoIP[0], tabCouple[i].duoIP[1]);
 
  return 0;
} | 
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