Zig code to read a file line by line

main.zig

// Zig code to read and print a file line by line

const std = @import("std");
const fs = std.fs;
const io = std.io;
const debug = std.debug;

pub fn main() anyerror!void {
    // use an absolute path
    const path = "/home/testdata/testfile";
    var f = try fs.openFileAbsolute(path, .{.mode = fs.File.OpenMode.read_only});
    defer f.close();
    var reader = f.reader();

    var output: [100]u8 = undefined;
    var output_fbs = io.fixedBufferStream(&output);
    const writer = output_fbs.writer();

    while(true) {
        reader.streamUntilDelimiter(writer, '\n', null) catch |err| {
            switch (err) {
                error.EndOfStream => {
                    output_fbs.reset(); // clear buffer before exit
                    break;
                }, // file read till the end
                else => {
                    debug.print("Error while reading file: {any}\n", .{err});
                    return err;
                },
            }
        };

        var line = output_fbs.getWritten();
        debug.print("Line: {s}\n", .{line});
        // since steamUntilDelimiter keeps appending the read bytes to the buffer
        // we should clear it on every iteration so that only individual lines are
        // displayed on each iteration.
        output_fbs.reset();
    }
}