arraymodule: Fix SF bug 113960.

reverse() didn't work at all due to bad arg check.
    Fixed that.
    Added Brad Chapman to ACKS file, as the proud new owner of two
        implicitly copyrighted lines of Python source code <wink>.
    Repaired buffer_info's total lack of arg-checking.
    Replaced memmove by memcpy in reverse() guts, as memmove is
        often slower and the memory areas are guaranteed disjoint.
    Replaced poke-and-hope unchecked decl of tmp buffer size by
        assert-checked larger tmp buffer.
    Got rid of inconsistent spaces before open paren in docstrings.
    Added reverse() sanity tests to test_array.py.

Lib/test/test_array.py

@@ -122,9 +122,14 @@ def testtype(type, example):
             a.pop()
             a.pop()
             a.pop()
-            a.pop()
+            x = a.pop()
+            if x != 'e':
+                raise TestFailed, "array(%s) pop-test" % `type`
             if a != array.array(type, "acd"):
             	raise TestFailed, "array(%s) pop-test" % `type`
+            a.reverse()
+            if a != array.array(type, "dca"):
+            	raise TestFailed, "array(%s) reverse-test" % `type`
         else:
             a = array.array(type, [1, 2, 3, 4, 5])
             a[:-1] = a
@@ -155,9 +160,14 @@ def testtype(type, example):
             a.pop()
             a.pop()
             a.pop()
-            a.pop()
+            x = a.pop()
+            if x != 5:
+                raise TestFailed, "array(%s) pop-test" % `type`
             if a != array.array(type, [1, 3, 4]):
             	raise TestFailed, "array(%s) pop-test" % `type`
+            a.reverse()
+            if a != array.array(type, [4, 3, 1]):
+            	raise TestFailed, "array(%s) reverse-test" % `type`
 
         # test that overflow exceptions are raised as expected for assignment
         # to array of specific integral types

Misc/ACKS

@@ -58,6 +58,7 @@ Mike Carlton
 Donn Cave
 Per Cederqvist
 Jeffrey Chang
+Brad Chapman
 Mitch Chapman
 David Chaum
 Nicolas Chauvat

Modules/arraymodule.c

@@ -328,7 +328,6 @@ static struct arraydescr descriptors[] = {
 	{'d', sizeof(double), d_getitem, d_setitem},
 	{'\0', 0, 0, 0} /* Sentinel */
 };
-/* If we ever allow items larger than double, we must change reverse()! */
 
 /****************************************************************************
 Implementations of array object methods.
@@ -802,8 +801,12 @@ Insert a new item x into the array before position i.";
 static PyObject *
 array_buffer_info(arrayobject *self, PyObject *args)
 {
-	PyObject* retval = PyTuple_New(2);
-	if (!retval) return NULL;
+	PyObject* retval = NULL;
+        if (!PyArg_ParseTuple(args, ":buffer_info"))
+                return NULL;
+	retval = PyTuple_New(2);
+	if (!retval)
+		return NULL;
 
 	PyTuple_SET_ITEM(retval, 0, PyLong_FromVoidPtr(self->ob_item));
 	PyTuple_SET_ITEM(retval, 1, PyInt_FromLong((long)(self->ob_size)));
@@ -812,7 +815,7 @@ array_buffer_info(arrayobject *self, PyObject *args)
 }
 
 static char buffer_info_doc [] =
-"buffer_info -> (address, length)\n\
+"buffer_info() -> (address, length)\n\
 \n\
 Return a tuple (address, length) giving the current memory address and\n\
 the length in bytes of the buffer used to hold array's contents.";
@@ -898,22 +901,24 @@ array_reverse(arrayobject *self, PyObject *args)
 {
 	register int itemsize = self->ob_descr->itemsize;
 	register char *p, *q;
-	char tmp[sizeof(double)]; /* Assume that's the max item size */
+	/* little buffer to hold items while swapping */
+	char tmp[256];	/* 8 is probably enough -- but why skimp */
+	assert(itemsize <= sizeof(tmp));
 
-	if (args != NULL) {
-		PyErr_SetString(PyExc_TypeError,
-		     "<array>.reverse requires exactly 0 arguments");
+        if (!PyArg_ParseTuple(args, ":reverse"))
                 return NULL;
-	}
 
 	if (self->ob_size > 1) {
 		for (p = self->ob_item,
 		     q = self->ob_item + (self->ob_size - 1)*itemsize;
 		     p < q;
 		     p += itemsize, q -= itemsize) {
-			memmove(tmp, p, itemsize);
-			memmove(p, q, itemsize);
-			memmove(q, tmp, itemsize);
+			/* memory areas guaranteed disjoint, so memcpy
+			 * is safe (& memmove may be slower).
+			 */
+			memcpy(tmp, p, itemsize);
+			memcpy(p, q, itemsize);
+			memcpy(q, tmp, itemsize);
 		}
 	}