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Fix wide char handling in wide string literal

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This commit fixed the problem that TCC directly cast each byte in wide string literal to wchar_t, which is wrong when wide string literal contains real wide chars.
It fixed the problem by assuming input charset is UTF-8, and wchar_t stores wide chars in UTF-16 (Windows) or UTF-32 (others).
The UTF-8 decoder is coded according to The Unicode Standard Version 10.
This commit is contained in:
Zhang Boyang 2017-09-09 20:37:43 +08:00
parent b8fe8fc210
commit a82c11f4b4
1 changed files with 67 additions and 1 deletions
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68
tccpp.c
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@ -2105,13 +2105,79 @@ static void parse_escape_string(CString *outstr, const uint8_t *buf, int is_long
tcc_warning("unknown escape sequence: \'\\x%x\'", c);
break;
}
} else if (is_long && c >= 0x80) {
/* assume we are processing UTF-8 sequence */
/* reference: The Unicode Standard, Version 10.0, ch3.9 */
int cont; /* count of continuation bytes */
int skip; /* how many bytes should skip when error occured */
int i;
/* decode leading byte */
if (c < 0xC2) {
skip = 1; goto invalid_utf8_sequence;
} else if (c <= 0xDF) {
cont = 1; n = c & 0x1f;
} else if (c <= 0xEF) {
cont = 2; n = c & 0xf;
} else if (c <= 0xF4) {
cont = 3; n = c & 0x7;
} else {
skip = 1; goto invalid_utf8_sequence;
}
/* decode continuation bytes */
for (i = 1; i <= cont; i++) {
int l = 0x80, h = 0xBF;
/* adjust limit for second byte */
if (i == 1) {
switch (c) {
case 0xE0: l = 0xA0; break;
case 0xED: h = 0x9F; break;
case 0xF0: l = 0x90; break;
case 0xF4: h = 0x8F; break;
}
}
if (p[i] < l || p[i] > h) {
skip = i; goto invalid_utf8_sequence;
}
n = (n << 6) | (p[i] & 0x3f);
}
/* advance pointer */
p += 1 + cont;
c = n;
goto add_char_nonext;
/* error handling */
invalid_utf8_sequence:
tcc_warning("ill-formed UTF-8 subsequence starting with: \'\\x%x\'", c);
c = 0xFFFD;
p += skip;
goto add_char_nonext;
}
p++;
add_char_nonext:
if (!is_long)
cstr_ccat(outstr, c);
else
else {
#ifdef TCC_TARGET_PE
/* store as UTF-16 */
if (c < 0x10000) {
cstr_wccat(outstr, c);
} else {
c -= 0x10000;
cstr_wccat(outstr, (c >> 10) + 0xD800);
cstr_wccat(outstr, (c & 0x3FF) + 0xDC00);
}
#else
cstr_wccat(outstr, c);
#endif
}
}
/* add a trailing '\0' */
if (!is_long)