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Issue #22818: Splitting on a pattern that could match an empty string now

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raises a warning.  Patterns that can only match empty strings are now
rejected.
This commit is contained in:
Serhiy Storchaka 2015-02-03 11:04:19 +02:00
parent 32ca3dcb97
commit 83e802796c
6 changed files with 85 additions and 20 deletions
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13
Modules/_sre.c
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@ -863,6 +863,19 @@ pattern_split(PatternObject* self, PyObject* args, PyObject* kw)
if (!string)
return NULL;
assert(self->codesize != 0);
if (self->code[0] != SRE_OP_INFO || self->code[3] == 0) {
if (self->code[0] == SRE_OP_INFO && self->code[4] == 0) {
PyErr_SetString(PyExc_ValueError,
"split() requires a non-empty pattern match.");
return NULL;
}
if (PyErr_WarnEx(PyExc_FutureWarning,
"split() requires a non-empty pattern match.",
1) < 0)
return NULL;
}
string = state_init(&state, self, string, 0, PY_SSIZE_T_MAX);
if (!string)
return NULL;