Excalibor,
The normal solution to this would be

while ( <FILE> ) {
    next if length() > 1024 * 1024;
    # ...
}
[download]

This will not work for you because have some lines that can't be read into memory before determining how long they are. The following steps should outline the process for you.

• Set $/ to read a fixed number of bytes (your max desired)
• Read a line from the file my $buffer = <FH>
• If the resulting buffer contains a newline:
• Extract up to the newline leaving the remainder in the buffer
• Repeat this process until there are no newlines remaining in the buffer
• Go to step 2 and prepend the old buffer to the new buffer
• If there is no newline it means the line is too long
• Empty the current buffer and read in a new line
• Repeat this process until a newline is detected
• Once detected, drop everything in the buffer up to and including the first newline
• Go to step 2 and prepend the old buffer to the new buffer
• Wash, Rinse, Repeat until the file has been exhausted

I would mock up an implementation for you but I don't have time ATM.

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.