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[DOC] Mention Windows text mode EOF marker interpretation

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I don't think this is super well known so it's worth mentioning as it
can be a pitfall.

See: https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/fopen-wfopen?view=msvc-170

Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org>
This commit is contained in:
Alan Wu 2022-08-03 10:48:43 -04:00
parent f1057393da
commit ca8daf70fa
Notes: git 2022-08-06 03:34:33 +09:00 
Merged: https://github.com/ruby/ruby/pull/6212
1 changed files with 4 additions and 2 deletions
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io.c
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@ -14504,9 +14504,11 @@ set_LAST_READ_LINE(VALUE val, ID _x, VALUE *_y)
* Either of the following may be suffixed to any of the string read/write modes above:
*
* - <tt>'t'</tt>: Text data; sets the default external encoding to +Encoding::UTF_8+;
* on Windows, enables conversion between EOL and CRLF.
* on Windows, enables conversion between EOL and CRLF and enables interpreting +0x1A+
* as an end-of-file marker.
* - <tt>'b'</tt>: Binary data; sets the default external encoding to +Encoding::ASCII_8BIT+;
* on Windows, suppresses conversion between EOL and CRLF.
* on Windows, suppresses conversion between EOL and CRLF and disables interpreting +0x1A+
* as an end-of-file marker.
*
* If neither is given, the stream defaults to text data.
*