Something

 do                                                                                                                                                   {i=0;                                                                                                                                        j=0;                                                                                                                                         lseek (fd2,0,SEEK_SET);                                                                                                                      *buffer2='a';                                                                                                                                if(read (fd,buffer,1)<=0)                                                                                                                            {printf ("\npas de hotspot disponible\n");                                                                                                   return 1;}                                                                                                                                   else                                                                                                                                         {ssid[i]=*buffer;                                                                                                                            while (*buffer!='\n')                                                                                                                                {read (fd, buffer,1);                                                                                                                        if (*buffer!='\n')                                                                                                                                   {i++;                                                                                                                                        ssid[i]=*buffer;}                                                                                                                    }                                                                                                                                    ssid[i+1]='\0';                                                                                                                                      while (*buffer2!='%' && (strcmp (ssid,ssid2)!=0))                                                                                                    {j=0;                                                                                                                                        read (fd2,buffer2,1);                                                                                                                        ssid2[j]=*buffer2;                                                                                                                           while (*buffer2!=';' && *buffer2!='%')                                                                                                               {read (fd2, buffer2,1);                                                                                                                      if (*buffer2!=';')                                                                                                                                   {j++;                                                                                                                                        ssid2[j]=*buffer2;}                                                                                                                  }                                                                                                                                    ssid2[j+1]='\0';                                                                                                                             }                                                                                                                            }                                                                                                                                    }