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cpython/Objects/stringlib/join.h at 3.5 · python/cpython · GitHub
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join.h
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join.h
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/* stringlib: bytes joining implementation */
#if
STRINGLIB_SIZEOF_CHAR
!=
1
#error
join.h only compatible with byte-wise strings
#endif
Py_LOCAL_INLINE
(
PyObject
*
)
STRINGLIB
(
bytes_join
)(
PyObject
*
sep
,
PyObject
*
iterable
)
{
char
*
sepstr
=
STRINGLIB_STR
(
sep
);
const
Py_ssize_t
seplen
=
STRINGLIB_LEN
(
sep
);
PyObject
*
res
=
NULL
;
char
*
p
;
Py_ssize_t
seqlen
=
0
;
Py_ssize_t
sz
=
0
;
Py_ssize_t
i
,
nbufs
;
PyObject
*
seq
,
*
item
;
Py_buffer
*
buffers
=
NULL
;
#define
NB_STATIC_BUFFERS
10
Py_buffer
static_buffers
[
NB_STATIC_BUFFERS
];
seq
=
PySequence_Fast
(
iterable
,
"can only join an iterable"
);
if
(
seq
==
NULL
) {
return
NULL
;
}
seqlen
=
PySequence_Fast_GET_SIZE
(
seq
);
if
(
seqlen
==
0
) {
Py_DECREF
(
seq
);
return
STRINGLIB_NEW
(
NULL
,
0
);
}
#ifndef
STRINGLIB_MUTABLE
if
(
seqlen
==
1
) {
item
=
PySequence_Fast_GET_ITEM
(
seq
,
0
);
if
(
STRINGLIB_CHECK_EXACT
(
item
)) {
Py_INCREF
(
item
);
Py_DECREF
(
seq
);
return
item
;
}
}
#endif
if
(
seqlen
>
NB_STATIC_BUFFERS
) {
buffers
=
PyMem_NEW
(
Py_buffer
,
seqlen
);
if
(
buffers
==
NULL
) {
Py_DECREF
(
seq
);
PyErr_NoMemory
();
return
NULL
;
}
}
else
{
buffers
=
static_buffers
;
}
/* Here is the general case. Do a pre-pass to figure out the total
* amount of space we'll need (sz), and see whether all arguments are
* bytes-like.
*/
for
(
i
=
0
,
nbufs
=
0
;
i
<
seqlen
;
i
++
) {
Py_ssize_t
itemlen
;
item
=
PySequence_Fast_GET_ITEM
(
seq
,
i
);
if
(
PyBytes_CheckExact
(
item
)) {
/* Fast path. */
Py_INCREF
(
item
);
buffers
[
i
].
obj
=
item
;
buffers
[
i
].
buf
=
PyBytes_AS_STRING
(
item
);
buffers
[
i
].
len
=
PyBytes_GET_SIZE
(
item
);
}
else
if
(
PyObject_GetBuffer
(
item
,
&
buffers
[
i
],
PyBUF_SIMPLE
)
!=
0
) {
PyErr_Format
(
PyExc_TypeError
,
"sequence item %zd: expected a bytes-like object, "
"%.80s found"
,
i
,
Py_TYPE
(
item
)
->
tp_name
);
goto
error
;
}
nbufs
=
i
+
1
;
/* for error cleanup */
itemlen
=
buffers
[
i
].
len
;
if
(
itemlen
>
PY_SSIZE_T_MAX
-
sz
) {
PyErr_SetString
(
PyExc_OverflowError
,
"join() result is too long"
);
goto
error
;
}
sz
+=
itemlen
;
if
(
i
!=
0
) {
if
(
seplen
>
PY_SSIZE_T_MAX
-
sz
) {
PyErr_SetString
(
PyExc_OverflowError
,
"join() result is too long"
);
goto
error
;
}
sz
+=
seplen
;
}
if
(
seqlen
!=
PySequence_Fast_GET_SIZE
(
seq
)) {
PyErr_SetString
(
PyExc_RuntimeError
,
"sequence changed size during iteration"
);
goto
error
;
}
}
/* Allocate result space. */
res
=
STRINGLIB_NEW
(
NULL
,
sz
);
if
(
res
==
NULL
)
goto
error
;
/* Catenate everything. */
p
=
STRINGLIB_STR
(
res
);
if
(!
seplen
) {
/* fast path */
for
(
i
=
0
;
i
<
nbufs
;
i
++
) {
Py_ssize_t
n
=
buffers
[
i
].
len
;
char
*
q
=
buffers
[
i
].
buf
;
Py_MEMCPY
(
p
,
q
,
n
);
p
+=
n
;
}
goto
done
;
}
for
(
i
=
0
;
i
<
nbufs
;
i
++
) {
Py_ssize_t
n
;
char
*
q
;
if
(
i
) {
Py_MEMCPY
(
p
,
sepstr
,
seplen
);
p
+=
seplen
;
}
n
=
buffers
[
i
].
len
;
q
=
buffers
[
i
].
buf
;
Py_MEMCPY
(
p
,
q
,
n
);
p
+=
n
;
}
goto
done
;
error
:
res
=
NULL
;
done
:
Py_DECREF
(
seq
);
for
(
i
=
0
;
i
<
nbufs
;
i
++
)
PyBuffer_Release
(
&
buffers
[
i
]);
if
(
buffers
!=
static_buffers
)
PyMem_FREE
(
buffers
);
return
res
;
}
#undef
NB_STATIC_BUFFERS
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