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reorganized PyUnicode_DecodeUnicodeEscape a bit (in order to make it 

less likely that bug #132817 ever appears again)
This commit is contained in:
Fredrik Lundh 2001-02-18 22:13:49 +00:00
parent b95896b2d2
commit ccc7473fc8
1 changed files with 73 additions and 114 deletions
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187
Objects/unicodeobject.c
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@ -1110,10 +1110,11 @@ PyObject *PyUnicode_DecodeUnicodeEscape(const char *s,
const char *errors)
{
PyUnicodeObject *v;
Py_UNICODE *p = NULL, *buf = NULL;
Py_UNICODE *p, *buf;
const char *end;
Py_UCS4 chr;
char* message;
Py_UCS4 chr = 0xffffffff; /* in case 'getcode' messes up */
/* Escaped strings will always be longer than the resulting
Unicode string, so we start with size here and then reduce the
length after conversion to the true value. */
@ -1122,16 +1123,18 @@ PyObject *PyUnicode_DecodeUnicodeEscape(const char *s,
goto onError;
if (size == 0)
return (PyObject *)v;
p = buf = PyUnicode_AS_UNICODE(v);
end = s + size;
while (s < end) {
unsigned char c;
Py_UNICODE x;
int i;
int i, digits;
/* Non-escape characters are interpreted as Unicode ordinals */
if (*s != '\\') {
*p++ = (unsigned char)*s++;
*p++ = (unsigned char) *s++;
continue;
}
@ -1164,60 +1167,31 @@ PyObject *PyUnicode_DecodeUnicodeEscape(const char *s,
*p++ = x;
break;
/* \xXX with two hex digits */
/* hex escapes */
/* \xXX */
case 'x':
for (x = 0, i = 0; i < 2; i++) {
c = (unsigned char)s[i];
if (!isxdigit(c)) {
if (unicodeescape_decoding_error(&s, &x, errors,
"truncated \\xXX"))
goto onError;
i++;
break;
}
x = (x<<4) & ~0xF;
if (c >= '0' && c <= '9')
x += c - '0';
else if (c >= 'a' && c <= 'f')
x += 10 + c - 'a';
else
x += 10 + c - 'A';
}
s += i;
*p++ = x;
break;
digits = 2;
message = "truncated \\xXX escape";
goto hexescape;
/* \uXXXX with 4 hex digits */
/* \uXXXX */
case 'u':
for (x = 0, i = 0; i < 4; i++) {
c = (unsigned char)s[i];
if (!isxdigit(c)) {
if (unicodeescape_decoding_error(&s, &x, errors,
"truncated \\uXXXX"))
goto onError;
i++;
break;
}
x = (x<<4) & ~0xF;
if (c >= '0' && c <= '9')
x += c - '0';
else if (c >= 'a' && c <= 'f')
x += 10 + c - 'a';
else
x += 10 + c - 'A';
}
s += i;
*p++ = x;
break;
digits = 4;
message = "truncated \\uXXXX escape";
goto hexescape;
/* \UXXXXXXXX with 8 hex digits */
/* \UXXXXXXXX */
case 'U':
for (chr = 0, i = 0; i < 8; i++) {
c = (unsigned char)s[i];
digits = 8;
message = "truncated \\UXXXXXXXX escape";
hexescape:
chr = 0;
for (i = 0; i < digits; i++) {
c = (unsigned char) s[i];
if (!isxdigit(c)) {
if (unicodeescape_decoding_error(&s, &x, errors,
"truncated \\uXXXX"))
if (unicodeescape_decoding_error(&s, &x, errors, message))
goto onError;
chr = x;
i++;
break;
}
@ -1230,65 +1204,7 @@ PyObject *PyUnicode_DecodeUnicodeEscape(const char *s,
chr += 10 + c - 'A';
}
s += i;
goto store;
case 'N':
/* Ok, we need to deal with Unicode Character Names now,
* make sure we've imported the hash table data...
*/
if (ucnhash_CAPI == NULL) {
PyObject *mod = 0, *v = 0;
mod = PyImport_ImportModule("unicodedata");
if (mod == NULL)
goto ucnhashError;
v = PyObject_GetAttrString(mod,"ucnhash_CAPI");
Py_DECREF(mod);
if (v == NULL)
goto ucnhashError;
ucnhash_CAPI = PyCObject_AsVoidPtr(v);
Py_DECREF(v);
if (ucnhash_CAPI == NULL)
goto ucnhashError;
}
if (*s == '{') {
const char *start = s + 1;
const char *endBrace = start;
/* look for the closing brace */
while (*endBrace != '}' && endBrace < end)
endBrace++;
if (endBrace != end && *endBrace == '}') {
if (!ucnhash_CAPI->getcode(start, endBrace-start, &chr)) {
if (unicodeescape_decoding_error(
&s, &x, errors,
"Invalid Unicode Character Name")
)
goto onError;
goto ucnFallthrough;
}
s = endBrace + 1;
goto store;
} else {
if (unicodeescape_decoding_error(
&s, &x, errors,
"Unicode name missing closing brace"))
goto onError;
goto ucnFallthrough;
}
break;
}
if (unicodeescape_decoding_error(
&s, &x, errors,
"Missing opening brace for Unicode Character Name escape"))
goto onError;
ucnFallthrough:
/* fall through on purpose */
default:
*p++ = '\\';
*p++ = (unsigned char)s[-1];
break;
store:
store:
/* when we get here, chr is a 32-bit unicode character */
if (chr <= 0xffff)
/* UCS-2 character */
@ -1301,24 +1217,67 @@ store:
} else {
if (unicodeescape_decoding_error(
&s, &x, errors,
"Illegal Unicode character")
"illegal Unicode character")
)
goto onError;
*p++ = x; /* store replacement character */
}
break;
/* \N{name} */
case 'N':
message = "malformed \\N character escape";
if (ucnhash_CAPI == NULL) {
/* load the unicode data module */
PyObject *m, *v;
m = PyImport_ImportModule("unicodedata");
if (m == NULL)
goto ucnhashError;
v = PyObject_GetAttrString(m, "ucnhash_CAPI");
Py_DECREF(m);
if (v == NULL)
goto ucnhashError;
ucnhash_CAPI = PyCObject_AsVoidPtr(v);
Py_DECREF(v);
if (ucnhash_CAPI == NULL)
goto ucnhashError;
}
if (*s == '{') {
const char *start = s+1;
/* look for the closing brace */
while (*s != '}' && s < end)
s++;
if (s > start && s < end && *s == '}') {
/* found a name. look it up in the unicode database */
message = "unknown Unicode character name";
s++;
if (ucnhash_CAPI->getcode(start, s-start-1, &chr))
goto store;
}
}
if (unicodeescape_decoding_error(&s, &x, errors, message))
goto onError;
*p++ = x;
break;
default:
*p++ = '\\';
*p++ = (unsigned char)s[-1];
break;
}
}
if (_PyUnicode_Resize(v, (int)(p - buf)))
goto onError;
return (PyObject *)v;
ucnhashError:
ucnhashError:
PyErr_SetString(
PyExc_UnicodeError,
"\\N escapes not supported (can't load unicodedata module)"
);
return NULL;
onError:
onError:
Py_XDECREF(v);
return NULL;
}