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When expandtabs() would be a no-op, don't create a duplicate string

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This commit is contained in:
Antoine Pitrou 2011-10-04 16:04:01 +02:00
parent 87a484caf5
commit e19aa388e8
2 changed files with 11 additions and 0 deletions
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7
Objects/unicodeobject.c
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@ -10196,6 +10196,7 @@ unicode_expandtabs(PyUnicodeObject *self, PyObject *args)
void *src_data, *dest_data;
int tabsize = 8;
int kind;
int found;
if (!PyArg_ParseTuple(args, "|i:expandtabs", &tabsize))
return NULL;
@ -10205,9 +10206,11 @@ unicode_expandtabs(PyUnicodeObject *self, PyObject *args)
i = j = line_pos = 0;
kind = PyUnicode_KIND(self);
src_data = PyUnicode_DATA(self);
found = 0;
for (; i < src_len; i++) {
ch = PyUnicode_READ(kind, src_data, i);
if (ch == '\t') {
found = 1;
if (tabsize > 0) {
incr = tabsize - (line_pos % tabsize); /* cannot overflow */
if (j > PY_SSIZE_T_MAX - incr)
@ -10225,6 +10228,10 @@ unicode_expandtabs(PyUnicodeObject *self, PyObject *args)
line_pos = 0;
}
}
if (!found && PyUnicode_CheckExact(self)) {
Py_INCREF((PyObject *) self);
return (PyObject *) self;
}
/* Second pass: create output string and fill it */
u = PyUnicode_New(j, PyUnicode_MAX_CHAR_VALUE(self));