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gh-139156: Use PyBytesWriter in PyUnicode_AsUnicodeEscapeString() (#139249)

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Replace PyBytes_FromStringAndSize() and _PyBytes_Resize() with the
PyBytesWriter API.
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Victor Stinner 2025-09-22 23:22:27 +02:00 • committed by GitHub
parent c863349f98
commit e578a9e6a5
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1 changed files with 16 additions and 30 deletions
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46
Objects/unicodeobject.c
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@ -6893,46 +6893,36 @@ PyUnicode_DecodeUnicodeEscape(const char *s,
PyObject *
PyUnicode_AsUnicodeEscapeString(PyObject *unicode)
{
Py_ssize_t i, len;
PyObject *repr;
char *p;
int kind;
const void *data;
Py_ssize_t expandsize;
/* Initial allocation is based on the longest-possible character
escape.
For UCS1 strings it's '\xxx', 4 bytes per source character.
For UCS2 strings it's '\uxxxx', 6 bytes per source character.
For UCS4 strings it's '\U00xxxxxx', 10 bytes per source character.
*/
if (!PyUnicode_Check(unicode)) {
PyErr_BadArgument();
return NULL;
}
len = PyUnicode_GET_LENGTH(unicode);
Py_ssize_t len = PyUnicode_GET_LENGTH(unicode);
if (len == 0) {
return Py_GetConstant(Py_CONSTANT_EMPTY_BYTES);
}
int kind = PyUnicode_KIND(unicode);
const void *data = PyUnicode_DATA(unicode);
kind = PyUnicode_KIND(unicode);
data = PyUnicode_DATA(unicode);
/* 4 byte characters can take up 10 bytes, 2 byte characters can take up 6
bytes, and 1 byte characters 4. */
expandsize = kind * 2 + 2;
/* Initial allocation is based on the longest-possible character
* escape.
*
* For UCS1 strings it's '\xxx', 4 bytes per source character.
* For UCS2 strings it's '\uxxxx', 6 bytes per source character.
* For UCS4 strings it's '\U00xxxxxx', 10 bytes per source character. */
Py_ssize_t expandsize = kind * 2 + 2;
if (len > PY_SSIZE_T_MAX / expandsize) {
return PyErr_NoMemory();
}
repr = PyBytes_FromStringAndSize(NULL, expandsize * len);
if (repr == NULL) {
PyBytesWriter *writer = PyBytesWriter_Create(expandsize * len);
if (writer == NULL) {
return NULL;
}
char *p = PyBytesWriter_GetData(writer);
p = PyBytes_AS_STRING(repr);
for (i = 0; i < len; i++) {
for (Py_ssize_t i = 0; i < len; i++) {
Py_UCS4 ch = PyUnicode_READ(kind, data, i);
/* U+0000-U+00ff range */
@ -6998,11 +6988,7 @@ PyUnicode_AsUnicodeEscapeString(PyObject *unicode)
}
}
assert(p - PyBytes_AS_STRING(repr) > 0);
if (_PyBytes_Resize(&repr, p - PyBytes_AS_STRING(repr)) < 0) {
return NULL;
}
return repr;
return PyBytesWriter_FinishWithPointer(writer, p);
}
/* --- Raw Unicode Escape Codec ------------------------------------------- */