Import teepee code

showbits-thermal-printer/src/util.rs

@@ -0,0 +1,18 @@
+const CODE_PAGE_437_SECOND_HALF: &str = concat!(
+    "ÇüéâäàåçêëèïîìÄÅ",
+    "ÉæÆôöòûùÿÖÜ¢£¥₧ƒ",
+    "áíóúñѪº¿⌐¬½¼¡«»",
+    "░▒▓│┤╡╢╖╕╣║╗╝╜╛┐",
+    "└┴┬├─┼╞╟╚╔╩╦╠═╬╧",
+    "╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀",
+    "αßΓπΣσµτΦΘΩδ∞φε∩",
+    "≡±≥≤⌠⌡÷≈°∙·√ⁿ²■",
+);
+
+fn is_safe(c: char) -> bool {
+    c.is_ascii_graphic() || c == ' ' || c == '\n' || CODE_PAGE_437_SECOND_HALF.contains(c)
+}
+
+pub fn sanitize(text: &str) -> String {
+    text.chars().filter(|&c| is_safe(c)).collect::<String>()
+}