From c3c17661b6ac0d3e7484fcf47316d29f6a0f81b1 Mon Sep 17 00:00:00 2001
From: Mischa POSLAWSKY <perl@shiar.org>
Date: Fri, 21 Apr 2017 19:31:01 +0200
Subject: [PATCH] charset: override cp437 glyphs using unicode string

More legible if not faster.
---
 charset.plp | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/charset.plp b/charset.plp
index e8382f5..4e25ef1 100644
--- a/charset.plp
+++ b/charset.plp
@@ -303,19 +303,14 @@ sub tabinput {
 		$row{endpoint} -= $row{offset};
 
 		if ($row{set} eq 'cp437') {
-			for my $phipos (237 - $row{offset}) {
-				next if $phipos < 0 or $phipos > $row{endpoint};
+			if ($row{offset} <= 0xED and $row{endpoint} >= 0xED - $row{offset}) {
 				# replace phi glyph
-				substr($row{table}, $phipos, 1) = pack 'U*', 0x3D5;
+				substr($row{table}, 0xED - $row{offset}, 1) = 'ϕ';
 			}
-			if ($row{offset} == 0) {
+			if ($row{offset} < 0x20) {
 				# replace control characters by visible variants
-				substr($row{table}, 0, 32) = pack 'U*', map {hex} qw(
-					2007 263A 263B 2665 2666 2663 2660 2022
-					25D8 25CB 25D9 2642 2640 266A 266B 263C
-					25BA 25C4 2195 203C 00B6 00A7 25AC 21A8
-					2191 2193 2192 2190 221F 2194 25B2 25BC
-				);
+				my $sub = substr ' ☺☻♥♦♣♠•◘○◙♂♀♪♫☼►◄↕‼¶§▬↨↑↓→←∟↔▲▼', $row{offset};
+				substr($row{table}, 0, length $sub) = $sub;
 			}
 		}
 		elsif ($row{set} eq 'symbol') {
-- 
2.30.0