[ARM] coading help requires for raspberry in C.

[syntax=dot]//code for reading the gps using raspberry pi

#include<stdio.h>
#include<errno.h>
#include<wiringPi.h>
#include<string.h>
#include<wiringSerial.h>
int main()
{
char gps[65];   //gps string array
int fd,flag=0;    //handler
char arr[]="$GPGGA";
printf("raspberry gps programme");
if(wiringPiSetup()<0)     //setup wiringpi
return -1;
else
printf("setup is ok\n");
if((fd=serialOpen("/dev/ttyAMA0",9600))<0)
{
fprintf(stderr,"unable to open serial device%s\n",strerror(errno));
}
else
{
printf("serial UART is Ok\n");
}
while(1)
{
int i=0;
int c;
if(c=serialGetchar(fd)==13||10)
{
for(i=0;i<6;i++)
{
if(serialGetchar(fd)==arr[i])
flag++;
}
}
if(flag==6)
{
flag=0;
for(i=0;i<=65;i++)
gps[i]=serialGetchar(fd);
}

printf("%d",gps);
}
fflush(stdout);
}[/syntax]



THESE ARE THE WIRINGPI LIB



Then the following functions are available:

[B]int serialOpen (char *device, int baud) ;[/B]

This opens and initialises the serial device and sets the baud rate. It sets the port into “raw” mode (character at a time and no translations), and sets the read timeout to 10 seconds. The return value is the file descriptor or -1 for any error, in which case errno will be set as appropriate.

[B]void serialClose (int fd) ;[/B]
Closes the device identified by the file descriptor given.

[B]void  serialPutchar (int fd, unsigned char c) ;[/B]
Sends the single byte to the serial device identified by the given file descriptor.

[B]void  serialPuts (int fd, char *s) ;[/B]
Sends the nul-terminated string to the serial device identified by the given file descriptor.

[B]void  serialPrintf (int fd, char *message, …) ;[/B]
Emulates the system printf function to the serial device.

[B]int   serialDataAvail (int fd) ;[/B]
Returns the number of characters available for reading, or -1 for any error condition, in which case errno will be set appropriately.

int serialGetchar (int fd) ;
Returns the next character available on the serial device. This call will block for up to 10 seconds if no data is available (when it will return -1)

void serialFlush (int fd) ;
This discards all data received, or waiting to be send down the given device.
please help me..