in reply to truncate string to byte count
First draft. Seems the right idea if not a final. Probably needs some kind of a "binary truncation" to avoid doing a crap ton of work if given a couple megabytes of character data but only looking for the first 255 bytes.
Update, redacted the update, it was wrong and only up for 30 seconds. :P
use 5.16.0; use strict; use utf8; use open ":std", ":encoding(utf8)"; use Encode; # my $str = "艾捷克, 萨塔尔, 胡西它尔."; my $str = "艾捷"; # Shortened string for terse output example. my $max_bytes = shift || length encode(utf8 => $str); while ( $max_bytes ) { my $length; $str =~ s/.\z// while ( $max_bytes < ( $length = length encode(utf8 => $str) ) ); $length ||= 0; say <<""; Max -> $max_bytes Actual -> $length String -> $str $max_bytes--; } __END__ Max -> 6 Actual -> 6 String -> 艾捷 Max -> 5 Actual -> 3 String -> 艾 Max -> 4 Actual -> 3 String -> 艾 Max -> 3 Actual -> 3 String -> 艾 Max -> 2 Actual -> 0 String -> Max -> 1 Actual -> 0 String ->
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