nios rs232 uart reads only last byte

Here is an example to detect some characters:

char* msg = "Detected the character 't'.\n";

FILE* fp;

char prompt = 0;

fp = fopen ("/dev/uart1", "r+"); //Open file for reading and writing

if (fp)

{

while (prompt != 'v')

{ // Loop until we receive a 'v'.

prompt = getc(fp); // Get a character from the UART.

if (prompt == 't')

{ // Print a message if character is 't'.

fwrite (msg, strlen (msg), 1, fp);

}

}

fprintf(fp, "Closing the UART file.\n");

fclose (fp);

}

return 0;