mirror of https://github.com/python/cpython.git
119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
#include "Python.h"
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static char xreadlines_doc [] =
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"xreadlines(f)\n\
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\n\
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Return an xreadlines object for the file f.";
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typedef struct {
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PyObject_HEAD
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PyObject *file;
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PyObject *lines;
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int lineslen;
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int lineno;
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int abslineno;
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} PyXReadlinesObject;
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staticforward PyTypeObject XReadlinesObject_Type;
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static void
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xreadlines_dealloc(PyXReadlinesObject *op) {
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Py_XDECREF(op->file);
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Py_XDECREF(op->lines);
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PyObject_DEL(op);
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}
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/* A larger chunk size doesn't seem to make a difference */
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#define CHUNKSIZE 8192
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static PyXReadlinesObject *
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newreadlinesobject(PyObject *file) {
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PyXReadlinesObject *op;
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op = PyObject_NEW(PyXReadlinesObject, &XReadlinesObject_Type);
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if (op == NULL)
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return NULL;
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Py_XINCREF(file);
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op->file = file;
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op->lines = NULL;
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op->abslineno = op->lineno = op->lineslen = 0;
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return op;
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}
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static PyObject *
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xreadlines(PyObject *self, PyObject *args) {
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PyObject *file;
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PyXReadlinesObject *ret;
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if (!PyArg_ParseTuple(args, "O:xreadlines", &file))
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return NULL;
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ret = newreadlinesobject(file);
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Py_XINCREF(ret);
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return (PyObject*)ret;
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}
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static PyObject*
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xreadlines_item(PyXReadlinesObject *a, int i) {
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if (i != a->abslineno) {
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PyErr_SetString(PyExc_RuntimeError,
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"xreadlines object accessed out of order");
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return NULL;
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}
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if (a->lineno >= a->lineslen) {
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Py_XDECREF(a->lines);
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a->lines = PyObject_CallMethod(a->file, "readlines", "(i)",
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CHUNKSIZE);
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if (a->lines == NULL)
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return NULL;
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a->lineno = 0;
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if ((a->lineslen = PySequence_Size(a->lines)) < 0)
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return NULL;
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}
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a->abslineno++;
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return PySequence_GetItem(a->lines, a->lineno++);
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}
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static PySequenceMethods xreadlines_as_sequence = {
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0, /*sq_length*/
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0, /*sq_concat*/
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0, /*sq_repeat*/
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(intargfunc)xreadlines_item, /*sq_item*/
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};
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static PyTypeObject XReadlinesObject_Type = {
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PyObject_HEAD_INIT(&PyType_Type)
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0,
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"xreadlines",
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sizeof(PyXReadlinesObject) + PyGC_HEAD_SIZE,
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0,
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(destructor)xreadlines_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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0, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number*/
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&xreadlines_as_sequence, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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0, /*tp_hash*/
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0, /*tp_call*/
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0, /*tp_str*/
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0, /*tp_getattro*/
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0, /*tp_setattro*/
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0, /*tp_as_buffer*/
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Py_TPFLAGS_DEFAULT, /*tp_flags*/
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0, /* tp_doc */
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};
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static PyMethodDef xreadlines_methods[] = {
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{"xreadlines", xreadlines, METH_VARARGS, xreadlines_doc},
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{NULL, NULL}
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};
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void
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initxreadlines(void)
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{
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PyObject *m;
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m = Py_InitModule("xreadlines", xreadlines_methods);
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}
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