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terminal UTF-8: Have an array for the interlink->utf_8.min values.

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The previous scheme incorrectly accepted 0xC1 0x80 as U+0040.
That could have been fixed by tweaking the loop, but the constant
array is surely easier to verify.
This commit is contained in:
Kalle Olavi Niemitalo 2006-08-21 00:41:27 +03:00 committed by Kalle Olavi Niemitalo
parent 38fe5b72f7
commit e333fb37ab
1 changed files with 28 additions and 11 deletions
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39
src/terminal/event.c
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@ -43,7 +43,7 @@ struct terminal_interlink {
struct {
unicode_val_T ucs;
int len;
int min;
unicode_val_T min;
/* Modifier keys from the key event that carried the
* first byte of the character. We need this because
* ELinks sees e.g. ESC U+00F6 as 0x1B 0xC3 0xB6 and
@ -385,26 +385,43 @@ handle_interlink_event(struct terminal *term, struct interlink_event *ilev)
} else if ((key & 0xC0) == 0xC0 && (key & 0xFE) != 0xFE) {
/* This is a UTF-8 start byte. */
unsigned int mask, cov = 0x80;
/* Minimum character values for UTF-8 octet
* sequences of each length, from RFC 2279.
* According to the RFC, UTF-8 decoders should
* reject characters that are encoded with
* more octets than necessary. (RFC 3629,
* which ELinks does not yet otherwise follow,
* tightened the "should" to "MUST".) */
static const unicode_val_T min[] = {
0x00000080, /* ... 0x000007FF with 2 octets */
0x00000800, /* ... 0x0000FFFF with 3 octets */
0x00010000, /* ... 0x001FFFFF with 4 octets */
0x00200000, /* ... 0x03FFFFFF with 5 octets */
0x04000000 /* ... 0x7FFFFFFF with 6 octets */
};
unsigned int mask;
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) {
/* Set @len = the number of contiguous 1's
* in the most significant bits of the first
* octet, i.e. @key. It is also the number
* of octets in the character. Leave @mask
* pointing to the first 0 bit found. */
for (mask = 0x80; key & mask; mask >>= 1)
len++;
interlink->utf_8.min = cov;
cov = 1 << (1 + 5 * len);
}
/* This will hold because @key was checked above. */
assert(len >= 2 && len <= 6);
if_assert_failed goto invalid_utf_8_start_byte;
interlink->utf_8.min = min[len - 2];
interlink->utf_8.len = len - 1;
interlink->utf_8.ucs = key & (mask - 1);
interlink->utf_8.modifier = modifier;
break;
}
invalid_utf_8_start_byte:
term_send_ucs(term, UCS_REPLACEMENT_CHARACTER, modifier);
break;
}