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tty/vt: Corrected doc of vc_sanitize_unicode(), vc_translate_unicode()

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Corrected the doc of vc_sanitize_unicode() and vc_translate_unicode(),
tightly coupled functions which parse UTF-8 byte sequences.
1. Desc. of @rescan corresponded to the meaning of the return value -1.
   Corrected + added "Return:" section.
2. Replaced the ambiguous "character" with "code point" or "byte".

Signed-off-by: Roman Žilka <roman.zilka@gmail.com>
Link: https://lore.kernel.org/r/bee9faa8-0ea7-4411-bf77-3cb2e06385c7@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Roman Žilka 2024-02-11 16:51:04 +01:00 committed by Greg Kroah-Hartman
parent 6cc3028f79
commit 8524788abf
1 changed files with 12 additions and 4 deletions
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16
drivers/tty/vt/vt.c
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@ -2780,7 +2780,7 @@ static inline int vc_translate_ascii(const struct vc_data *vc, int c)
/**
* vc_sanitize_unicode - Replace invalid Unicode code points with ``U+FFFD``
* @c: the received character, or ``U+FFFD`` for invalid sequences.
* @c: the received code point
*/
static inline int vc_sanitize_unicode(const int c)
{
@ -2793,13 +2793,21 @@ static inline int vc_sanitize_unicode(const int c)
/**
* vc_translate_unicode - Combine UTF-8 into Unicode in &vc_data.vc_utf_char
* @vc: virtual console
* @c: character to translate
* @rescan: we return true if we need more (continuation) data
* @c: UTF-8 byte to translate
* @rescan: set to true iff @c wasn't consumed here and needs to be re-processed
*
* * &vc_data.vc_utf_char is the being-constructed unicode character.
* * &vc_data.vc_utf_char is the being-constructed Unicode code point.
* * &vc_data.vc_utf_count is the number of continuation bytes still expected to
* arrive.
* * &vc_data.vc_npar is the number of continuation bytes arrived so far.
*
* Return:
* * %-1 - Input OK so far, @c consumed, further bytes expected.
* * %0xFFFD - Possibility 1: input invalid, @c may have been consumed (see
* desc. of @rescan). Possibility 2: input OK, @c consumed,
* ``U+FFFD`` is the resulting code point. ``U+FFFD`` is valid,
* ``REPLACEMENT CHARACTER``.
* * otherwise - Input OK, @c consumed, resulting code point returned.
*/
static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
{