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https://github.com/fish-shell/fish-shell
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52dcfe11af
Up to now, in normal locales \x was essentially the same as \X, except that it errored if given a value > 0x7f. That's kind of annoying and useless. A subtle change is that `\xHH` now represents the character (if any) encoded by the byte value "HH", so even for values <= 0x7f if that's not the same as the ASCII value we would diverge. I do not believe anyone has ever run fish on a system where that distinction matters. It isn't a thing for UTF-8, it isn't a thing for ASCII, it isn't a thing for UTF-16, it isn't a thing for any extended ASCII scheme - ISO8859-X, it isn't a thing for SHIFT-JIS. I am reasonably certain we are making that same assumption in other places. Fixes #1352
104 lines
3.8 KiB
Fish
104 lines
3.8 KiB
Fish
#RUN: %fish -C "set fish %fish" %s
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# This hangs when running on github actions with tsan for unknown reasons,
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# see #7934.
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#REQUIRES: test -z "$GITHUB_WORKFLOW"
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# We typically try to force a utf8-capable locale,
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# this turns that off.
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set -gx fish_allow_singlebyte_locale 1
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# A function to display bytes, necessary because GNU and BSD implementations of `od` have different output.
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# We used to use xxd, but it's not available everywhere. See #3797.
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#
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# We use the lowest common denominator format, `-b`, because it should work in all implementations.
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# I wish we could use the `-t` flag but it isn't available in every OS we're likely to run on.
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#
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function display_bytes
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od -b | sed -e 's/ */ /g' -e 's/ *$//'
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end
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# Verify that our UTF-8 locale produces the expected output.
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echo -n A\u00FCA | display_bytes
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#CHECK: 0000000 101 303 274 101
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#CHECK: 0000004
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# Verify that exporting a change to the C locale produces the expected output.
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# The output should include the literal byte \xFC rather than the UTF-8 sequence for \u00FC.
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begin
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set -lx LC_ALL C
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echo -n B\u00FCB | display_bytes
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end
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#CHECK: 0000000 102 374 102
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#CHECK: 0000003
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# Since the previous change was localized to a block it should no
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# longer be in effect and we should be back to a UTF-8 locale.
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echo -n C\u00FCC | display_bytes
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#CHECK: 0000000 103 303 274 103
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#CHECK: 0000004
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# Verify that setting a non-exported locale var doesn't affect the behavior.
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# The output should include the UTF-8 sequence for \u00FC rather than that literal byte.
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# Just like the previous test.
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begin
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set -l LC_ALL C
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echo -n D\u00FCD | display_bytes
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end
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#CHECK: 0000000 104 303 274 104
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#CHECK: 0000004
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# Verify that fish can pass through non-ASCII characters in the C/POSIX
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# locale. This is to prevent regression of
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# https://github.com/fish-shell/fish-shell/issues/2802.
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#
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# These tests are needed because the relevant standards allow the functions
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# mbrtowc() and wcrtomb() to treat bytes with the high bit set as either valid
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# or invalid in the C/POSIX locales. GNU libc treats those bytes as invalid.
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# Other libc implementations (e.g., BSD) treat them as valid. We want fish to
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# always treat those bytes as valid.
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# The fish in the middle of the pipeline should be receiving a UTF-8 encoded
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# version of the unicode from the echo. It should pass those bytes thru
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# literally since it is in the C locale. We verify this by first passing the
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# echo output directly to the `xxd` program then via a fish instance. The
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# output should be "58c3bb58" for the first statement and "58c3bc58" for the
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# second.
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echo -n X\u00FBX | display_bytes
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echo X\u00FCX | env LC_ALL=C $fish -c 'read foo; echo -n $foo' | display_bytes
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#CHECK: 0000000 130 303 273 130
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#CHECK: 0000004
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#CHECK: 0000000 130 303 274 130
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#CHECK: 0000004
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# The next tests deliberately spawn another fish instance to test inheritance of env vars.
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# This test is subtle. Despite the presence of the \u00fc unicode char (a "u"
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# with an umlaut) the fact the locale is C/POSIX will cause the \xfc byte to
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# be emitted rather than the usual UTF-8 sequence \xc3\xbc. That's because the
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# few single-byte unicode chars (that are not ASCII) are generally in the
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# ISO 8859-x char sets which are encompassed by the C locale. The output should
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# be "59fc59".
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env LC_ALL=C $fish -c 'echo -n Y\u00FCY' | display_bytes
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#CHECK: 0000000 131 374 131
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#CHECK: 0000003
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# The user can specify a wide unicode character (one requiring more than a
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# single byte). In the C/POSIX locales we substitute a question-mark for the
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# unencodable wide char. The output should be "543f54".
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env LC_ALL=C $fish -c 'echo -n T\u01FDT' | display_bytes
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#CHECK: 0000000 124 077 124
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#CHECK: 0000003
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string match ö \Xc3\Xb6
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#CHECK: ö
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math 5 \X2b 5
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#CHECK: 10
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math 7 \x2b 7
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#CHECK: 14
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echo \xc3\xb6
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# CHECK: ö
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echo \Xc3\Xb6
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# CHECK: ö
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