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Support in the cross-platform code for translating to and from

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UTF-16 when exchanging wchar_t strings with the front end. Enabled
by a #define in the platform's header file (one should not
promiscuously translate UTF-16 surrogate pairs on 32-bit wchar_t
platforms since that could give rise to redundant encoding attacks),
which is present on Windows.

[originally from svn r8495]
This commit is contained in:
Simon Tatham
2009-03-24 22:24:31 +00:00
parent 713df723ae
commit 87aafaa89a
3 changed files with 38 additions and 6 deletions
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28
ldiscucs.c
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@ -49,19 +49,39 @@ void luni_send(void *handle, wchar_t * widebuf, int len, int interactive)
if (in_utf(ldisc->term)) {
/* UTF is a simple algorithm */
for (p = linebuffer, i = 0; i < len; i++) {
wchar_t ch = widebuf[i];
/* We only deal with 16-bit wide chars */
if ((ch&0xF800) == 0xD800) ch = '.';
unsigned long ch = widebuf[i];
if ((ch & 0xF800) == 0xD800) {
#ifdef PLATFORM_IS_UTF16
if (i+1 < len) {
unsigned long ch2 = widebuf[i+1];
if ((ch & 0xFC00) == 0xD800 &&
(ch2 & 0xFC00) == 0xDC00) {
ch = 0x10000 + ((ch & 0x3FF) << 10) + (ch2 & 0x3FF);
i++;
}
} else
#endif
{
/* Unrecognised UTF-16 sequence */
ch = '.';
}
}
if (ch < 0x80) {
*p++ = (char) (ch);
} else if (ch < 0x800) {
*p++ = (0xC0 | (ch >> 6));
*p++ = (0x80 | (ch & 0x3F));
} else {
} else if (ch < 0x10000) {
*p++ = (0xE0 | (ch >> 12));
*p++ = (0x80 | ((ch >> 6) & 0x3F));
*p++ = (0x80 | (ch & 0x3F));
} else {
*p++ = (0xF0 | (ch >> 18));
*p++ = (0x80 | ((ch >> 12) & 0x3F));
*p++ = (0x80 | ((ch >> 6) & 0x3F));
*p++ = (0x80 | (ch & 0x3F));
}
}
} else {