Fix BZ2File.(x)readlines() for files without a newline.

Lib/test/test_bz2.py

@@ -37,7 +37,7 @@ class BaseTest(unittest.TestCase):
             return bz2.decompress(data)
 
 class BZ2FileTest(BaseTest):
-    "Test MCRYPT type miscelaneous methods."
+    "Test BZ2File type miscellaneous methods."
 
     def setUp(self):
         self.filename = TESTFN
@@ -245,6 +245,22 @@ class BZ2FileTest(BaseTest):
         self.assertEqual(f.tell(), len(self.DATA))
         f.close()
 
+    def testBug1191043(self):
+        # readlines() for files containing no newline
+        data = 'BZh91AY&SY\xd9b\x89]\x00\x00\x00\x03\x80\x04\x00\x02\x00\x0c\x00 \x00!\x9ah3M\x13<]\xc9\x14\xe1BCe\x8a%t'
+        f = open(self.filename, "wb")
+        f.write(data)
+        f.close()
+        bz2f = BZ2File(self.filename)
+        lines = bz2f.readlines()
+        bz2f.close()
+        self.assertEqual(lines, ['Test'])
+        bz2f = BZ2File(self.filename)
+        xlines = bz2f.xreadlines()
+        bz2f.close()
+        self.assertEqual(lines, ['Test'])
+
+
 class BZ2CompressorTest(BaseTest):
     def testCompress(self):
         # "Test BZ2Compressor.compress()/flush()"

Misc/NEWS

@@ -1570,6 +1570,9 @@ Core and builtins
 Extension modules
 -----------------
 
+- Fix bz2.BZ2File.(x)readlines() for files containing one line without
+  newlines.
+
 - Added socket.getservbyport(), and make the second argument in
   getservbyname() and getservbyport() optional.
 

Modules/bz2module.c

@@ -22,6 +22,18 @@ static char __author__[] =
     Gustavo Niemeyer <niemeyer@conectiva.com>\n\
 ";
 
+/* Our very own off_t-like type, 64-bit if possible */
+/* copied from Objects/fileobject.c */
+#if !defined(HAVE_LARGEFILE_SUPPORT)
+typedef off_t Py_off_t;
+#elif SIZEOF_OFF_T >= 8
+typedef off_t Py_off_t;
+#elif SIZEOF_FPOS_T >= 8
+typedef fpos_t Py_off_t;
+#else
+#error "Large file support, but neither off_t nor fpos_t is large enough."
+#endif
+
 #define BUF(v) PyString_AS_STRING((PyStringObject *)v)
 
 #define MODE_CLOSED   0
@@ -405,7 +417,9 @@ Util_ReadAhead(BZ2FileObject *f, int bufsize)
 			Util_DropReadAhead(f);
 	}
 	if (f->mode == MODE_READ_EOF) {
-		return -1;
+		f->f_bufptr = f->f_buf;
+		f->f_bufend = f->f_buf;
+		return 0;
 	}
 	if ((f->f_buf = PyMem_Malloc(bufsize)) == NULL) {
 		return -1;
@@ -682,7 +696,7 @@ BZ2File_readlines(BZ2FileObject *self, PyObject *args)
 		}
 		totalread += nread;
 		p = memchr(buffer+nfilled, '\n', nread);
-		if (p == NULL) {
+		if (!shortread && p == NULL) {
 			/* Need a larger buffer to fit this line */
 			nfilled += nread;
 			buffersize *= 2;
@@ -709,7 +723,7 @@ BZ2File_readlines(BZ2FileObject *self, PyObject *args)
 		}
 		end = buffer+nfilled+nread;
 		q = buffer;
-		do {
+		while (p != NULL) {
 			/* Process complete lines */
 			p++;
 			line = PyString_FromStringAndSize(q, p-q);
@@ -721,7 +735,7 @@ BZ2File_readlines(BZ2FileObject *self, PyObject *args)
 				goto error;
 			q = p;
 			p = memchr(q, '\n', end-q);
-		} while (p != NULL);
+		}
 		/* Move the remaining incomplete line to the start */
 		nfilled = end-q;
 		memmove(buffer, q, nfilled);
@@ -962,7 +976,8 @@ static PyObject *
 BZ2File_seek(BZ2FileObject *self, PyObject *args)
 {
 	int where = 0;
-	long offset;
+	PyObject *offobj;
+	Py_off_t offset;
 	char small_buffer[SMALLCHUNK];
 	char *buffer = small_buffer;
 	size_t buffersize = SMALLCHUNK;
@@ -973,7 +988,15 @@ BZ2File_seek(BZ2FileObject *self, PyObject *args)
 	int rewind = 0;
 	PyObject *ret = NULL;
 
-	if (!PyArg_ParseTuple(args, "l|i:seek", &offset, &where))
+	if (!PyArg_ParseTuple(args, "O|i:seek", &offobj, &where))
+		return NULL;
+#if !defined(HAVE_LARGEFILE_SUPPORT)
+	offset = PyInt_AsLong(offobj);
+#else
+	offset = PyLong_Check(offobj) ?
+		PyLong_AsLongLong(offobj) : PyInt_AsLong(offobj);
+#endif
+	if (PyErr_Occurred())
 		return NULL;
 
 	ACQUIRE_LOCK(self);