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correct logic when pos is after the string #10467

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Benjamin Peterson 2010-11-20 17:24:04 +00:00
parent 6bcfadec07
commit fa73555cfc
3 changed files with 16 additions and 3 deletions
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11
Modules/_io/bytesio.c
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@ -430,15 +430,20 @@ static PyObject *
bytesio_readinto(bytesio *self, PyObject *buffer)
{
void *raw_buffer;
Py_ssize_t len;
Py_ssize_t len, n;
CHECK_CLOSED(self);
if (PyObject_AsWriteBuffer(buffer, &raw_buffer, &len) == -1)
return NULL;
if (self->pos + len > self->string_size)
len = self->string_size - self->pos;
/* adjust invalid sizes */
n = self->string_size - self->pos;
if (len > n) {
len = n;
if (len < 0)
len = 0;
}
memcpy(raw_buffer, self->buf + self->pos, len);
assert(self->pos + len < PY_SSIZE_T_MAX);