Bridge broken after trying to read a file

i'm using yun sd "embedded" in filesystem using yundiskspander.  have created file /root/users

code: [select]


root@arduinoyun:~# cat users
4442048:fperal
4438376:test
3333333:bogus
root@arduinoyun:~#



a program reads file using function readuser.

code: [select]


#include <fileio.h>
#include <bridge.h>


int readuser(file, char *tag, char *username);



void setup()
{
  bridge.begin();     //start communication linino

  console.begin();    //start communication ethernet console (300bps)
  while (!console);   //wait until console ready
  console.println("arduino starting......");


}
 
void loop()
{

  char tag[14];
  int index=0;
  int i;


     char rfid[10],user[25];
     //create objets usersfile, linked users in linino, open reading
     file usersfile=filesystem.open("/root/users",file_read);
 

    console.println("start reading user file");

     while(readuser(usersfile,rfid, user)==0)
     {
        console.print("username=");
        console.println(user);
        console.print("tag=");
        console.println(rfid);
     }


    console.println("finish reading user file");
 
     delay(10000);

 
}




//////////////////////////////////////////////////////////////////////////////////////////////////////////
// readuser
//
// reads linino file next tag id
// returns tagid in string format @ tag , username in string format @ username
// returns 0 if went ok , >0 if there error:
// 1  -> error reading file /root/users
// 2 -> error: /root/users may empty?


int readuser(file usersfile, char *tag, char *username)
{
  static int counter=0;
  counter++;
  console.print("call num ");
  console.print(counter);
  console.println(" readuser");

  if(usersfile==0)
  {
     console.println("error reading file /root/users "); 
    return 1;
  }

 console.print("usersfile=");console.println(usersfile);
 
  if(usersfile.available()==0)
  {
    console.println("error: /root/users may empty?"); 
    return 2; //no data found. maybe eof?
  }

  console.println("usersfile.available>0"); 
 
 
  char data[25]="xx";
  int i=0;

  console.println("start reading file ");  //

  while(usersfile.available()>0 && data[i]!='\n')  //read file until eof or lf found
  {
    data[i]=usersfile.read();
    console.print(data[i]);
    if(data[i]!='\n') i++;  //next char until lf found
  }
 
  console.println(" --> line completed ");
 
 
  i=0;
  do  //read tag, until : found
  {
    tag[i]=data[i];
  } while(data[++i]!=':');
  tag[i++]='\0';  //add string terminator

  int n=0;
  do  //read username, until lf found
  {
    username[n++]=data[i];
  } while(data[++i]!='\n');
  username[n]='\0';  //add end of string

  console.print("line read users: ");
  console.println(data);
 
  return 0; //all went ok
}





the function works first time called, second time reports error

code: [select]


start reading user file
call num 1 readuser
usersfile=1
usersfile.available>0
start reading file
4442048:fperal
 --> line completed
line read users: 4442048:fperal

username=fperal
tag=4442048
call num 2 readuser
usersfile=1
connection closed foreign host




so, function works in first call, in second 1 seems when executes  if(usersfile.available()==0)   the bridge crash.

i have power cycle yun because after can't connect concole.
the ethernet connection running, can connect yun using ssh, , can reprogram (and bridge starts again)

i can't find why.

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