File read is happening even after end of file

[ajoshi]

Hi All,

I am doing a file read operation, using a while loop. Even after the end of file is reached the while is still executing. Here is the code:

while (!$feof(file2))begin
             $fscanf(file2, "%d %d %d %d %d" , col1, col2, col3, col4, col5);
             //`uvm_info(get_type_name(),"Reading file2",UVM_LOW)
             offset_data_i = '{col1 , col2, col3, col4, col5};
             itr = offset_data_i[0];
             cnt = cnt + 1;
             `uvm_info(get_type_name(),$sformatf("Value of count = %0d",cnt),UVM_LOW)
         end //while (!$feof(file2))

The file has 1440388 lines, my count value is going beyond this.

Can somebody let me know what is the issue and why this happens?

Regards,
Abhinandan

[dave_59]

SystemVerilog $feof()

In reply to mukeshkumar.saha@reliabletechsys.com: It’s because after the read of the last data value in the file, there are still more characters in the file (like a newline) and the final call to $fscanf fails and leaves addr and data unmodified. What you need to do is check the return value of $fscanf. file = $fopen("data_file.txt","r"); while ($fscanf(file,"%h %h",addr,data)==2) begin $display("addr:%h <<< -- >>> data:%h",addr,data); end

Why it’s bad to use feof() to control a loop