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Close #10142: Support for SEEK_HOLE/SEEK_DATA

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This commit is contained in:
Jesus Cea 2012-04-26 16:39:35 +02:00
parent 790a9b4c19
commit 2b47f0a23f
8 changed files with 60 additions and 12 deletions
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21
Modules/_io/bufferedio.c
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@ -1157,9 +1157,20 @@ buffered_seek(buffered *self, PyObject *args)
if (!PyArg_ParseTuple(args, "O|i:seek", &targetobj, &whence)) {
return NULL;
}
if (whence < 0 || whence > 2) {
/* Do some error checking instead of trusting OS 'seek()'
** error detection, just in case.
*/
if ((whence < 0 || whence >2)
#ifdef SEEK_HOLE
&& (whence != SEEK_HOLE)
#endif
#ifdef SEEK_DATA
&& (whence != SEEK_DATA)
#endif
) {
PyErr_Format(PyExc_ValueError,
"whence must be between 0 and 2, not %d", whence);
"whence value %d unsupported", whence);
return NULL;
}
@ -1172,7 +1183,11 @@ buffered_seek(buffered *self, PyObject *args)
if (target == -1 && PyErr_Occurred())
return NULL;
if (whence != 2 && self->readable) {
/* SEEK_SET and SEEK_CUR are special because we could seek inside the
buffer. Other whence values must be managed without this optimization.
Some Operating Systems can provide additional values, like
SEEK_HOLE/SEEK_DATA. */
if (((whence == 0) || (whence == 1)) && self->readable) {
Py_off_t current, avail;
/* Check if seeking leaves us inside the current buffer,
so as to return quickly if possible. Also, we needn't take the