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Comment the UTF-8 decoding in handle_interlink_event

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Thanks to Kalle Olavi Niemitalo for explaining it to me. Any errors,
however, are no doubt my own.
This commit is contained in:
Miciah Dashiel Butler Masters 2006-08-06 22:17:20 +00:00 committed by Miciah Dashiel Butler Masters
parent 462607416c
commit cfbf7d1439
1 changed files with 34 additions and 0 deletions
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34
src/terminal/event.c
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@ -318,8 +318,19 @@ handle_interlink_event(struct terminal *term, struct interlink_event *ilev)
utf8_io = get_opt_bool_tree(term->spec, "utf_8_io");
#endif /* CONFIG_UTF_8 */
/* In UTF-8 byte sequences that have more than one byte, the
* first byte is between 0xC0 and 0xFF and the remaining bytes
* are between 0x80 and 0xBF. If there is just one byte, then
* it is between 0x00 and 0x7F and it is straight ASCII.
* (All 'betweens' are inclusive.) */
if (interlink->utf_8.len) {
/* A previous call to handle_interlink_event
* got a UTF-8 start byte. */
if (key >= 0x80 && key <= 0xBF && utf8_io) {
/* This is a UTF-8 continuation byte. */
interlink->utf_8.ucs <<= 6;
interlink->utf_8.ucs |= key & 0x3F;
if (! --interlink->utf_8.len) {
@ -333,6 +344,11 @@ handle_interlink_event(struct terminal *term, struct interlink_event *ilev)
break;
} else {
/* The byte sequence for this character is
* ending prematurely. Send UCS_NO_CHAR for the
* terminated character, but don't break; let
* this byte be handled below. */
interlink->utf_8.len = 0;
term_send_ucs(term, UCS_NO_CHAR,
term->interlink->utf_8.modifier);
@ -340,8 +356,16 @@ handle_interlink_event(struct terminal *term, struct interlink_event *ilev)
}
if (key < 0x80 || key > 0xFF || !utf8_io) {
/* This byte is not part of a multibyte character
* encoding: either it is outside of the ranges for
* UTF-8 start and continuation bytes or UTF-8 I/O mode
* is disabled. */
#ifdef CONFIG_UTF_8
if (key >= 0 && key <= 0xFF && !utf8_io) {
/* Not special and UTF-8 mode is disabled:
* recode from the terminal charset to UCS-4. */
key = cp2u(get_opt_codepage_tree(term->spec,
"charset"),
key);
@ -349,14 +373,24 @@ handle_interlink_event(struct terminal *term, struct interlink_event *ilev)
break;
}
#endif /* !CONFIG_UTF_8 */
/* It must be special (e.g., F1 or Enter)
* or a single-byte UTF-8 character. */
set_kbd_term_event(&tev, key, modifier);
term_send_event(term, &tev);
break;
} else if ((key & 0xC0) == 0xC0 && (key & 0xFE) != 0xFE) {
/* This is a UTF-8 start byte. */
unsigned int mask, cov = 0x80;
int len = 0;
/* The number of 1's between the first bit and first
* 0 bit (exclusive) is the number of remaining
* continuation bytes in the encoding of the character
* that is now being processed, which number will be
* stored in interlink->utf_8.len. */
for (mask = 0x80; key & mask; mask >>= 1) {
len++;
interlink->utf_8.min = cov;