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gh-129813, PEP 782: Use PyBytesWriter in _PyBytes_DecodeEscape2() by vstinner · Pull Request #138838 · python/cpython · GitHub

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gh-129813, PEP 782: Use PyBytesWriter in _PyBytes_DecodeEscape2() #138838

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Merged
vstinner merged 1 commit into from
Sep 13, 2025
Conversation 0 Commits 1 Checks 45 Files changed
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gh-129813, PEP 782: Use PyBytesWriter in _PyBytes_DecodeEscape2() #138838

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24 changes: 10 additions & 14 deletions Objects/bytesobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1090,22 +1090,16 @@ PyObject *_PyBytes_DecodeEscape2(const char *s,
int *first_invalid_escape_char,
const char **first_invalid_escape_ptr)
{
int c;
char *p;
const char *end;
_PyBytesWriter writer;

_PyBytesWriter_Init(&writer);

p = _PyBytesWriter_Alloc(&writer, len);
if (p == NULL)
PyBytesWriter *writer = PyBytesWriter_Create(len);
if (writer == NULL) {
return NULL;
writer.overallocate = 1;
}
char *p = PyBytesWriter_GetData(writer);

*first_invalid_escape_char = -1;
*first_invalid_escape_ptr = NULL;

end = s + len;
const char *end = s + len;
while (s < end) {
if (*s != '\\') {
*p++ = *s++;
Expand Down Expand Up @@ -1134,7 +1128,8 @@ PyObject *_PyBytes_DecodeEscape2(const char *s,
case 'a': *p++ = '\007'; break; /* BEL, not classic C */
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
c = s[-1] - '0';
{
int c = s[-1] - '0';
if (s < end && '0' <= *s && *s <= '7') {
c = (c<<3) + *s++ - '0';
if (s < end && '0' <= *s && *s <= '7')
Expand All @@ -1149,6 +1144,7 @@ PyObject *_PyBytes_DecodeEscape2(const char *s,
}
*p++ = c;
break;
}
case 'x':
if (s+1 < end) {
int digit1, digit2;
Expand Down Expand Up @@ -1195,10 +1191,10 @@ PyObject *_PyBytes_DecodeEscape2(const char *s,
}
}

return _PyBytesWriter_Finish(&writer, p);
return PyBytesWriter_FinishWithPointer(writer, p);

failed:
_PyBytesWriter_Dealloc(&writer);
PyBytesWriter_Discard(writer);
return NULL;
}

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