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Added checks to prevent PyUnicode_Count() from dumping core

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in case the parameters are out of bounds and fixes error handling
for .count(), .startswith() and .endswith() for the case of
mixed string/Unicode objects.

This patch adds Python style index semantics to PyUnicode_Count()
indices (including the special handling of negative indices).

The patch is an extended version of patch #103249 submitted
by Michael Hudson (mwh) on SF. It also includes new test cases.
This commit is contained in:
Marc-André Lemburg 2001-01-16 11:54:12 +00:00
parent 1c5aa6901f
commit 3a645e4dd4
4 changed files with 56 additions and 19 deletions
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27
Objects/unicodeobject.c
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@ -1976,7 +1976,7 @@ PyObject *PyUnicode_DecodeCharmap(const char *s,
x = Py_None;
Py_INCREF(x);
} else
goto onError;
goto onError;
}
/* Apply mapping */
@ -2014,9 +2014,9 @@ PyObject *PyUnicode_DecodeCharmap(const char *s,
(targetsize << 2);
extrachars += needed;
if (_PyUnicode_Resize(v, PyUnicode_GET_SIZE(v) + needed)) {
Py_DECREF(x);
goto onError;
}
Py_DECREF(x);
goto onError;
}
p = PyUnicode_AS_UNICODE(v) + oldpos;
}
Py_UNICODE_COPY(p,
@ -2112,7 +2112,7 @@ PyObject *PyUnicode_EncodeCharmap(const Py_UNICODE *p,
x = Py_None;
Py_INCREF(x);
} else
goto onError;
goto onError;
}
/* Apply mapping */
@ -2150,9 +2150,9 @@ PyObject *PyUnicode_EncodeCharmap(const Py_UNICODE *p,
(targetsize << 2);
extrachars += needed;
if (_PyString_Resize(&v, PyString_GET_SIZE(v) + needed)) {
Py_DECREF(x);
goto onError;
}
Py_DECREF(x);
goto onError;
}
s = PyString_AS_STRING(v) + oldpos;
}
memcpy(s,
@ -2392,6 +2392,17 @@ int count(PyUnicodeObject *self,
{
int count = 0;
if (start < 0)
start += self->length;
if (start < 0)
start = 0;
if (end > self->length)
end = self->length;
if (end < 0)
end += self->length;
if (end < 0)
end = 0;
if (substring->length == 0)
return (end - start + 1);