FazBrowse GitHub Viewer
|
Trending
|
URL:
|
Home
Tools:
[Download Repo ZIP]
[View Raw Code]
[Original HTTPS Page]
cpython/Objects/stringlib/join.h at feature-json-array-hook · jsbueno/cpython · GitHub
jsbueno
cpython
Repository navigation
Code
Pull requests
Actions
Projects
Security and quality
Insights
Expand file tree
Breadcrumbs
cpython
/
Objects
/
stringlib
/
join.h
Copy path
More file actions
More file actions
Latest commit
History
History
History
162 lines (153 loc) · 4.6 KB
Breadcrumbs
cpython
/
Objects
/
stringlib
/
join.h
Copy path
File metadata and controls
162 lines (153 loc) · 4.6 KB
Raw
Copy raw file
Download raw file
Open symbols panel
Edit and raw actions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
/* stringlib: bytes joining implementation */
#if
STRINGLIB_IS_UNICODE
#error
join.h only compatible with byte-wise strings
#endif
Py_LOCAL_INLINE
(
PyObject
*
)
STRINGLIB
(
bytes_join
)(
PyObject
*
sep
,
PyObject
*
iterable
)
{
const
char
*
sepstr
=
STRINGLIB_STR
(
sep
);
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
];
#define
GIL_THRESHOLD
1048576
int
drop_gil
=
1
;
PyThreadState
*
save
=
NULL
;
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
);
}
#if
!
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. */
buffers
[
i
].
obj
=
Py_NewRef
(
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
;
}
/* If the backing objects are mutable, then dropping the GIL
* opens up race conditions where another thread tries to modify
* the object which we hold a buffer on it. Such code has data
* races anyway, but this is a conservative approach that avoids
* changing the behaviour of that data race.
*/
drop_gil
=
0
;
}
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
(
sz
<
GIL_THRESHOLD
) {
drop_gil
=
0
;
/* Benefits are likely outweighed by the overheads */
}
if
(
drop_gil
) {
save
=
PyEval_SaveThread
();
}
if
(!
seplen
) {
/* fast path */
for
(
i
=
0
;
i
<
nbufs
;
i
++
) {
Py_ssize_t
n
=
buffers
[
i
].
len
;
char
*
q
=
buffers
[
i
].
buf
;
memcpy
(
p
,
q
,
n
);
p
+=
n
;
}
}
else
{
for
(
i
=
0
;
i
<
nbufs
;
i
++
) {
Py_ssize_t
n
;
char
*
q
;
if
(
i
) {
memcpy
(
p
,
sepstr
,
seplen
);
p
+=
seplen
;
}
n
=
buffers
[
i
].
len
;
q
=
buffers
[
i
].
buf
;
memcpy
(
p
,
q
,
n
);
p
+=
n
;
}
}
if
(
drop_gil
) {
PyEval_RestoreThread
(
save
);
}
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
#undef
GIL_THRESHOLD
Back
|
FazBrowse Home
|
New Git URL