gh-152415: Exercise curses non-ASCII tests under 8-bit locale encodings#152416
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serhiy-storchaka merged 2 commits intoJun 27, 2026
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The non-ASCII tests only exercised what the runner's locale could encode (in
practice UTF-8). Add 8-bit-encoding cases to the character and string I/O
tests, each guarded by the existing encodability check: ASCII, a character
common to the Latin encodings ('é'), and ones distinctive to a single encoding
(byte 0xA4 is '¤' in ISO-8859-1, '€' in ISO-8859-15, 'є' in KOI8-U). Run the
whole suite under different locales to cover them; unrepresentable cases skip.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
serhiy-storchaka
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needs backport to 3.15
…haracter Read each written character back with in_wch() or instr() rather than inch(), which on a wide build returns the low byte of the code point instead of the locale-encoded byte and so mangles a non-ASCII character of an 8-bit locale. This lets the int-argument cases cover '€'/'є', and adds matching coverage for the str argument. insch() with an int byte > 127 is checked only for Latin-1: on a wide build ncurses winsch stores a printable byte directly as a code point instead of decoding it through the locale. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.15. |
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Sorry, @serhiy-storchaka, I could not cleanly backport this to |
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GH-152453 is a backport of this pull request to the 3.15 branch. |
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…encodings (GH-152416) (#152453) The non-ASCII tests only exercised what the runner's locale could encode (in practice UTF-8). Add 8-bit-encoding cases to the character and string I/O tests, each guarded by the existing encodability check: ASCII, a character common to the Latin encodings ('é'), and ones distinctive to a single encoding (byte 0xA4 is '¤' in ISO-8859-1, '€' in ISO-8859-15, 'є' in KOI8-U). Run the whole suite under different locales to cover them; unrepresentable cases skip. * gh-152415: Verify character output round-trips in test_output_character Read each written character back with in_wch() or instr() rather than inch(), which on a wide build returns the low byte of the code point instead of the locale-encoded byte and so mangles a non-ASCII character of an 8-bit locale. This lets the int-argument cases cover '€'/'є', and adds matching coverage for the str argument. insch() with an int byte > 127 is checked only for Latin-1: on a wide build ncurses winsch stores a printable byte directly as a code point instead of decoding it through the locale. (cherry picked from commit 003d362) Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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…encodings (GH-152416) (GH-152453) (GH-152457) The non-ASCII tests only exercised what the runner's locale could encode (in practice UTF-8). Add 8-bit-encoding cases to the character and string I/O tests, each guarded by the existing encodability check: ASCII, a character common to the Latin encodings ('é'), and ones distinctive to a single encoding (byte 0xA4 is '¤' in ISO-8859-1, '€' in ISO-8859-15, 'є' in KOI8-U). Run the whole suite under different locales to cover them; unrepresentable cases skip. * gh-152415: Verify character output round-trips in test_output_character Read each written character back with in_wch() or instr() rather than inch(), which on a wide build returns the low byte of the code point instead of the locale-encoded byte and so mangles a non-ASCII character of an 8-bit locale. This lets the int-argument cases cover '€'/'є', and adds matching coverage for the str argument. insch() with an int byte > 127 is checked only for Latin-1: on a wide build ncurses winsch stores a printable byte directly as a code point instead of decoding it through the locale. (cherry picked from commit 003d362) (cherry picked from commit a75aa41) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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Jun 27, 2026
…encodings (GH-152416) (GH-152453) (GH-152456) The non-ASCII tests only exercised what the runner's locale could encode (in practice UTF-8). Add 8-bit-encoding cases to the character and string I/O tests, each guarded by the existing encodability check: ASCII, a character common to the Latin encodings ('é'), and ones distinctive to a single encoding (byte 0xA4 is '¤' in ISO-8859-1, '€' in ISO-8859-15, 'є' in KOI8-U). Run the whole suite under different locales to cover them; unrepresentable cases skip. * gh-152415: Verify character output round-trips in test_output_character Read each written character back with in_wch() or instr() rather than inch(), which on a wide build returns the low byte of the code point instead of the locale-encoded byte and so mangles a non-ASCII character of an 8-bit locale. This lets the int-argument cases cover '€'/'є', and adds matching coverage for the str argument. insch() with an int byte > 127 is checked only for Latin-1: on a wide build ncurses winsch stores a printable byte directly as a code point instead of decoding it through the locale. (cherry picked from commit 003d362) (cherry picked from commit a75aa41) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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The non-ASCII tests in
test_cursesonly exercised what the test runner's locale could encode, in practice UTF-8, so the byte-oriented (8-bit locale) code paths were barely tested and several text-accepting methods were tested only with ASCII.This extends the character and string I/O tests with cases for 8-bit encodings, each guarded by the existing encodability check (skipped when the current locale cannot represent it): ASCII, a character common to the Latin encodings (
é), and ones distinctive to a single encoding (byte 0xA4 is¤in ISO-8859-1,€in ISO-8859-15,єin KOI8-U). Running the whole suite under different locales (LANG=en_US.ISO8859-1,en_US.ISO8859-15,uk_UA.koi8u) covers those encodings.It also fills read-side and other gaps found by an audit of the text-accepting API:
inch/instr,get_wstr(previously untested),getbkgd/getbkgrnd,unctrl, the defaultborder()/box()ACS cells, and characters given aschtypeints > 127.A couple of build-/locale-specific notes captured in the comments: on a wide build
inchand int (chtype) characters round-trip only Latin-1 codepoints (the wide build stores text/ints through the locale), so those assertions are guarded toord < 0x100, whileinstrcovers the full set.Test-only; no behaviour change. Verified on wide and narrow (ncursesw-disabled) builds under UTF-8, ISO-8859-1, ISO-8859-15 and KOI8-U.