Function patch_seq_file_for_each_line_plus 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn patch_seq_file_for_each_line_plus(
    stack: Stack,
) -> Stack

Process each line of a file with a quotation

Stack effect: ( String Quotation – String Int )

Opens the file, calls the quotation with each line (including newline), then closes the file.

Returns:

• Success: ( “” 1 )
• Error: ( “error message” 0 )

The quotation should have effect ( String – ), receiving each line and consuming it. Empty files return success without calling the quotation.

Line Ending Normalization

Line endings are normalized to \n regardless of platform. Windows-style \r\n endings are converted to \n. This ensures consistent behavior when processing files across different operating systems.

Example

"data.txt" [ string-chomp process-line ] file-for-each-line+
if
    "Done processing" write_line
else
    "Error: " swap string-concat write_line
then

Safety

• stack must be a valid, non-null stack pointer
• Top of stack must be a Quotation or Closure
• Second on stack must be a String (file path)