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get_sourcefile(): use PyUnicode_READ() to avoid the creation of a temporary

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Py_UCS4 buffer
This commit is contained in:
Victor Stinner 2012-06-16 03:22:05 +02:00
parent ca439eecea
commit 81c39a88a4
1 changed files with 11 additions and 12 deletions
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23
Python/import.c
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@ -1008,23 +1008,25 @@ static PyObject *
get_sourcefile(PyObject *filename) get_sourcefile(PyObject *filename)
{ {
Py_ssize_t len; Py_ssize_t len;
Py_UCS4 *fileuni;
PyObject *py; PyObject *py;
struct stat statbuf; struct stat statbuf;
int err; int err;
void *data;
unsigned int kind;
len = PyUnicode_GET_LENGTH(filename); len = PyUnicode_GET_LENGTH(filename);
if (len == 0) if (len == 0)
Py_RETURN_NONE; Py_RETURN_NONE;
/* don't match *.pyc or *.pyo? */ /* don't match *.pyc or *.pyo? */
fileuni = PyUnicode_AsUCS4Copy(filename); data = PyUnicode_DATA(filename);
if (!fileuni) kind = PyUnicode_KIND(filename);
return NULL;
if (len < 5 if (len < 5
|| fileuni[len-4] != '.' || PyUnicode_READ(kind, data, len-4) != '.'
|| (fileuni[len-3] != 'p' && fileuni[len-3] != 'P') || (PyUnicode_READ(kind, data, len-3) != 'p'
|| (fileuni[len-2] != 'y' && fileuni[len-2] != 'Y')) && PyUnicode_READ(kind, data, len-3) != 'P')
|| (PyUnicode_READ(kind, data, len-2) != 'y'
&& PyUnicode_READ(kind, data, len-2) != 'Y'))
goto unchanged; goto unchanged;
/* Start by trying to turn PEP 3147 path into source path. If that /* Start by trying to turn PEP 3147 path into source path. If that
@ -1034,7 +1036,7 @@ get_sourcefile(PyObject *filename)
py = make_source_pathname(filename); py = make_source_pathname(filename);
if (py == NULL) { if (py == NULL) {
PyErr_Clear(); PyErr_Clear();
py = PyUnicode_FromKindAndData(PyUnicode_4BYTE_KIND, fileuni, len - 1); py = PyUnicode_Substring(filename, 0, len - 1);
} }
if (py == NULL) if (py == NULL)
goto error; goto error;
@ -1042,17 +1044,14 @@ get_sourcefile(PyObject *filename)
err = _Py_stat(py, &statbuf); err = _Py_stat(py, &statbuf);
if (err == -2) if (err == -2)
goto error; goto error;
if (err == 0 && S_ISREG(statbuf.st_mode)) { if (err == 0 && S_ISREG(statbuf.st_mode))
PyMem_Free(fileuni);
return py; return py;
}
Py_DECREF(py); Py_DECREF(py);
goto unchanged; goto unchanged;
error: error:
PyErr_Clear(); PyErr_Clear();
unchanged: unchanged:
PyMem_Free(fileuni);
Py_INCREF(filename); Py_INCREF(filename);
return filename; return filename;
} }