From: "mame (Yusuke Endoh)" Date: 2022-08-25T12:37:38+00:00 Subject: [ruby-core:109688] [Ruby master Bug#18973] Kernel#sprintf: %c allows codepoints above 127 for 7-bits ASCII encoding Issue #18973 has been updated by mame (Yusuke Endoh). We brielfly discussed this issue at the dev meeting. @naruse said it should behave like `String#<<` as follows. @nobu said he would try to implement this. ```ruby s = "".force_encoding("US-ASCII") s << 128 p s #=> "\x80" p s.encoding #=> # s = "".force_encoding("US-ASCII") s << 256 #=> 256 out of char range (RangeError) ``` ---------------------------------------- Bug #18973: Kernel#sprintf: %c allows codepoints above 127 for 7-bits ASCII encoding https://bugs.ruby-lang.org/issues/18973#change-98912 * Author: andrykonchin (Andrew Konchin) * Status: Open * Priority: Normal * ruby -v: 3.0.3 * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN ---------------------------------------- I've noticed the following behavior: ```ruby sprintf("%c".encode("US-ASCII"), 128) => "\x80" sprintf("%c".encode("US-ASCII"), 128).valid_encoding? => false ``` Specifying codepoints 128-255 for ASCII encoded formatting sequence leads to a broken string. ```ruby sprintf("%c".encode("US-ASCII"), 255) => "\xFF" sprintf("%c".encode("US-ASCII"), 256) (irb):17:in `sprintf': 256 out of char range (RangeError) ``` Specifying codepoint greater that 255 causes the expected exception `out of char range`. I suppose this exception should be raised for codepoints 128-255 as well (for ASCII encoding). -- https://bugs.ruby-lang.org/ Unsubscribe: