From: Brendan Higgins <brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
To: gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org,
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Brendan Higgins
<brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Tim.Bird-7U/KSKJipcs@public.gmane.org,
linux-um-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
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mpe-Gsx/Oe8HsFggBc27wqDAHg@public.gmane.org,
joe-6d6DIl74uiNBDgjK7y7TUQ@public.gmane.org
Subject: [RFC v3 03/19] kunit: test: add string_stream a std::stream like string builder
Date: Wed, 28 Nov 2018 11:36:20 -0800 [thread overview]
Message-ID: <20181128193636.254378-4-brendanhiggins@google.com> (raw)
In-Reply-To: <20181128193636.254378-1-brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
A number of test features need to do pretty complicated string printing
where it may not be possible to rely on a single preallocated string
with parameters.
So provide a library for constructing the string as you go similar to
C++'s std::string.
Signed-off-by: Brendan Higgins <brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
---
include/kunit/string-stream.h | 44 ++++++++++
kunit/Makefile | 3 +-
kunit/string-stream.c | 149 ++++++++++++++++++++++++++++++++++
3 files changed, 195 insertions(+), 1 deletion(-)
create mode 100644 include/kunit/string-stream.h
create mode 100644 kunit/string-stream.c
diff --git a/include/kunit/string-stream.h b/include/kunit/string-stream.h
new file mode 100644
index 0000000000000..933ed5740cf07
--- /dev/null
+++ b/include/kunit/string-stream.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * C++ stream style string builder used in KUnit for building messages.
+ *
+ * Copyright (C) 2018, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
+ */
+
+#ifndef _KUNIT_STRING_STREAM_H
+#define _KUNIT_STRING_STREAM_H
+
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/kref.h>
+#include <stdarg.h>
+
+struct string_stream_fragment {
+ struct list_head node;
+ char *fragment;
+};
+
+struct string_stream {
+ size_t length;
+ struct list_head fragments;
+
+ /* length and fragments are protected by this lock */
+ spinlock_t lock;
+ struct kref refcount;
+ int (*add)(struct string_stream *this, const char *fmt, ...);
+ int (*vadd)(struct string_stream *this, const char *fmt, va_list args);
+ char *(*get_string)(struct string_stream *this);
+ void (*clear)(struct string_stream *this);
+ bool (*is_empty)(struct string_stream *this);
+};
+
+struct string_stream *new_string_stream(void);
+
+void destroy_string_stream(struct string_stream *stream);
+
+void string_stream_get(struct string_stream *stream);
+
+int string_stream_put(struct string_stream *stream);
+
+#endif /* _KUNIT_STRING_STREAM_H */
diff --git a/kunit/Makefile b/kunit/Makefile
index 5efdc4dea2c08..275b565a0e81f 100644
--- a/kunit/Makefile
+++ b/kunit/Makefile
@@ -1 +1,2 @@
-obj-$(CONFIG_KUNIT) += test.o
+obj-$(CONFIG_KUNIT) += test.o \
+ string-stream.o
diff --git a/kunit/string-stream.c b/kunit/string-stream.c
new file mode 100644
index 0000000000000..1e7efa630cc35
--- /dev/null
+++ b/kunit/string-stream.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * C++ stream style string builder used in KUnit for building messages.
+ *
+ * Copyright (C) 2018, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
+ */
+
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <kunit/string-stream.h>
+
+static int string_stream_vadd(struct string_stream *this,
+ const char *fmt,
+ va_list args)
+{
+ struct string_stream_fragment *fragment;
+ int len;
+ va_list args_for_counting;
+ unsigned long flags;
+
+ /* Make a copy because `vsnprintf` could change it */
+ va_copy(args_for_counting, args);
+
+ /* Need space for null byte. */
+ len = vsnprintf(NULL, 0, fmt, args_for_counting) + 1;
+
+ va_end(args_for_counting);
+
+ fragment = kmalloc(sizeof(*fragment), GFP_KERNEL);
+ if (!fragment)
+ return -ENOMEM;
+
+ fragment->fragment = kmalloc(len, GFP_KERNEL);
+ if (!fragment->fragment) {
+ kfree(fragment);
+ return -ENOMEM;
+ }
+
+ len = vsnprintf(fragment->fragment, len, fmt, args);
+ spin_lock_irqsave(&this->lock, flags);
+ this->length += len;
+ list_add_tail(&fragment->node, &this->fragments);
+ spin_unlock_irqrestore(&this->lock, flags);
+ return 0;
+}
+
+static int string_stream_add(struct string_stream *this, const char *fmt, ...)
+{
+ va_list args;
+ int result;
+
+ va_start(args, fmt);
+ result = string_stream_vadd(this, fmt, args);
+ va_end(args);
+ return result;
+}
+
+static void string_stream_clear(struct string_stream *this)
+{
+ struct string_stream_fragment *fragment, *fragment_safe;
+ unsigned long flags;
+
+ spin_lock_irqsave(&this->lock, flags);
+ list_for_each_entry_safe(fragment,
+ fragment_safe,
+ &this->fragments,
+ node) {
+ list_del(&fragment->node);
+ kfree(fragment->fragment);
+ kfree(fragment);
+ }
+ this->length = 0;
+ spin_unlock_irqrestore(&this->lock, flags);
+}
+
+static char *string_stream_get_string(struct string_stream *this)
+{
+ struct string_stream_fragment *fragment;
+ size_t buf_len = this->length + 1; /* +1 for null byte. */
+ char *buf;
+ unsigned long flags;
+
+ buf = kzalloc(buf_len, GFP_KERNEL);
+ if (!buf)
+ return NULL;
+
+ spin_lock_irqsave(&this->lock, flags);
+ list_for_each_entry(fragment, &this->fragments, node)
+ strlcat(buf, fragment->fragment, buf_len);
+ spin_unlock_irqrestore(&this->lock, flags);
+
+ return buf;
+}
+
+static bool string_stream_is_empty(struct string_stream *this)
+{
+ bool is_empty;
+ unsigned long flags;
+
+ spin_lock_irqsave(&this->lock, flags);
+ is_empty = list_empty(&this->fragments);
+ spin_unlock_irqrestore(&this->lock, flags);
+
+ return is_empty;
+}
+
+void destroy_string_stream(struct string_stream *stream)
+{
+ stream->clear(stream);
+ kfree(stream);
+}
+
+static void string_stream_destroy(struct kref *kref)
+{
+ struct string_stream *stream = container_of(kref,
+ struct string_stream,
+ refcount);
+ destroy_string_stream(stream);
+}
+
+struct string_stream *new_string_stream(void)
+{
+ struct string_stream *stream = kzalloc(sizeof(*stream), GFP_KERNEL);
+
+ if (!stream)
+ return NULL;
+
+ INIT_LIST_HEAD(&stream->fragments);
+ spin_lock_init(&stream->lock);
+ kref_init(&stream->refcount);
+ stream->add = string_stream_add;
+ stream->vadd = string_stream_vadd;
+ stream->get_string = string_stream_get_string;
+ stream->clear = string_stream_clear;
+ stream->is_empty = string_stream_is_empty;
+ return stream;
+}
+
+void string_stream_get(struct string_stream *stream)
+{
+ kref_get(&stream->refcount);
+}
+
+int string_stream_put(struct string_stream *stream)
+{
+ return kref_put(&stream->refcount, &string_stream_destroy);
+}
+
--
2.20.0.rc0.387.gc7a69e6b6c-goog
next prev parent reply other threads:[~2018-11-28 19:36 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-28 19:36 [RFC v3 00/19] kunit: introduce KUnit, the Linux kernel unit testing framework Brendan Higgins
2018-11-28 19:36 ` [RFC v3 01/19] kunit: test: add KUnit test runner core Brendan Higgins
2018-11-30 3:14 ` Luis Chamberlain
2018-12-01 1:51 ` Brendan Higgins
2018-12-01 2:57 ` Luis Chamberlain
2018-12-05 13:15 ` Anton Ivanov
2018-12-05 14:45 ` Arnd Bergmann
2018-12-05 14:49 ` Anton Ivanov
2018-11-30 3:28 ` Luis Chamberlain
[not found] ` <20181130032802.GG18410-dAjH6bxAqesAS62YNPtMr3dQhYtBYE6JAL8bYrjMMd8@public.gmane.org>
2018-12-01 2:08 ` Brendan Higgins
2018-12-01 3:10 ` Luis Chamberlain
[not found] ` <20181201031049.GL28501-dAjH6bxAqesAS62YNPtMr3dQhYtBYE6JAL8bYrjMMd8@public.gmane.org>
2018-12-03 22:47 ` Brendan Higgins
2018-12-01 3:02 ` Luis Chamberlain
2018-11-28 19:36 ` [RFC v3 10/19] kunit: test: add test managed resource tests Brendan Higgins
[not found] ` <20181128193636.254378-1-brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2018-11-28 19:36 ` [RFC v3 02/19] kunit: test: add test resource management API Brendan Higgins
2018-11-28 19:36 ` Brendan Higgins [this message]
2018-11-30 3:29 ` [RFC v3 03/19] kunit: test: add string_stream a std::stream like string builder Luis Chamberlain
2018-12-01 2:14 ` Brendan Higgins
2018-12-01 3:12 ` Luis Chamberlain
2018-12-03 10:55 ` Petr Mladek
2018-12-04 0:35 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 04/19] kunit: test: add test_stream a std::stream like logger Brendan Higgins
2018-11-28 19:36 ` [RFC v3 05/19] kunit: test: add the concept of expectations Brendan Higgins
2018-11-28 19:36 ` [RFC v3 06/19] arch: um: enable running kunit from User Mode Linux Brendan Higgins
2018-11-28 21:26 ` Rob Herring
2018-11-30 3:37 ` Luis Chamberlain
2018-11-30 14:05 ` Rob Herring
2018-11-30 18:22 ` Luis Chamberlain
[not found] ` <20181130182203.GS18410-dAjH6bxAqesAS62YNPtMr3dQhYtBYE6JAL8bYrjMMd8@public.gmane.org>
2018-12-03 23:22 ` Brendan Higgins
2018-11-30 3:30 ` Luis Chamberlain
2018-11-28 19:36 ` [RFC v3 07/19] kunit: test: add initial tests Brendan Higgins
2018-11-30 3:40 ` Luis Chamberlain
2018-12-03 23:26 ` Brendan Higgins
2018-12-03 23:43 ` Luis Chamberlain
2018-11-28 19:36 ` [RFC v3 08/19] arch: um: add shim to trap to allow installing a fault catcher for tests Brendan Higgins
2018-11-30 3:34 ` Luis Chamberlain
[not found] ` <20181130033429.GK18410-dAjH6bxAqesAS62YNPtMr3dQhYtBYE6JAL8bYrjMMd8@public.gmane.org>
2018-12-03 23:34 ` Brendan Higgins
[not found] ` <CAFd5g45+MAVaSW8HN9x57Y8Um=TV1Oa=-K8yExPBS-4KjLyciQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-12-03 23:46 ` Luis Chamberlain
[not found] ` <20181203234628.GR28501-dAjH6bxAqesAS62YNPtMr3dQhYtBYE6JAL8bYrjMMd8@public.gmane.org>
2018-12-04 0:44 ` Brendan Higgins
2018-11-30 3:41 ` Luis Chamberlain
2018-12-03 23:37 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 09/19] kunit: test: add the concept of assertions Brendan Higgins
2018-11-28 19:36 ` [RFC v3 11/19] kunit: add Python libraries for handing KUnit config and kernel Brendan Higgins
2018-11-29 13:54 ` Kieran Bingham
[not found] ` <841cf4ae-501b-05ae-5863-a51010709b67-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
2018-12-03 23:48 ` Brendan Higgins
2018-12-04 20:47 ` Luis Chamberlain
2018-12-06 12:32 ` Kieran Bingham
2018-12-06 15:37 ` Matthew Wilcox
2018-12-07 11:30 ` Kieran Bingham
2018-12-11 14:09 ` Petr Mladek
2018-12-11 14:41 ` Steven Rostedt
2018-12-11 17:01 ` Anton Ivanov
2019-02-09 0:40 ` Brendan Higgins
2018-12-07 1:05 ` Luis Chamberlain
2018-12-07 18:35 ` Kent Overstreet
2018-11-30 3:44 ` Luis Chamberlain
2018-12-03 23:50 ` Brendan Higgins
2018-12-04 20:48 ` Luis Chamberlain
2018-11-28 19:36 ` [RFC v3 12/19] kunit: add KUnit wrapper script and simple output parser Brendan Higgins
2018-11-28 19:36 ` [RFC v3 13/19] kunit: improve output from python wrapper Brendan Higgins
2018-11-28 19:36 ` [RFC v3 14/19] Documentation: kunit: add documentation for KUnit Brendan Higgins
2018-11-29 13:56 ` Kieran Bingham
2018-11-30 3:45 ` Luis Chamberlain
[not found] ` <20181130034525.GP18410-dAjH6bxAqesAS62YNPtMr3dQhYtBYE6JAL8bYrjMMd8@public.gmane.org>
2018-12-03 23:53 ` Brendan Higgins
2018-12-06 12:16 ` Kieran Bingham
2019-02-09 0:56 ` Brendan Higgins
2019-02-11 12:16 ` Kieran Bingham
2019-02-12 22:10 ` Brendan Higgins
2019-02-13 21:55 ` Kieran Bingham
2019-02-14 0:17 ` Brendan Higgins
2019-02-14 17:26 ` Luis Chamberlain
2019-02-14 22:07 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 15/19] MAINTAINERS: add entry for KUnit the unit testing framework Brendan Higgins
2018-11-28 19:36 ` [RFC v3 17/19] of: unittest: migrate tests to run on KUnit Brendan Higgins
2018-11-28 20:56 ` Rob Herring
2018-11-30 0:39 ` Randy Dunlap
[not found] ` <18814973-8f0a-4647-a097-fcc3dc0b3cd3-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2018-12-04 0:13 ` Brendan Higgins
2018-12-04 13:40 ` Rob Herring
[not found] ` <CAL_JsqL_PivQbrJFEusdKAy-2EQtKL3OHbmyYSK9bzuTOQegqA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-12-05 23:42 ` Brendan Higgins
2018-12-07 0:41 ` Rob Herring
2018-12-04 0:08 ` Brendan Higgins
2019-02-13 1:44 ` Brendan Higgins
2019-02-14 20:10 ` Rob Herring
2019-02-14 21:52 ` Brendan Higgins
2019-02-18 22:56 ` Frank Rowand
2019-02-28 0:29 ` Brendan Higgins
2018-12-04 10:56 ` Frank Rowand
2018-11-28 19:36 ` [RFC v3 18/19] of: unittest: split out a couple of test cases from unittest Brendan Higgins
2018-12-04 10:58 ` Frank Rowand
2018-12-05 23:54 ` Brendan Higgins
2019-02-14 23:57 ` Frank Rowand
2019-02-15 0:56 ` Brendan Higgins
2019-02-15 2:05 ` Frank Rowand
2019-02-15 10:56 ` Brendan Higgins
2019-02-18 22:25 ` Frank Rowand
2019-02-20 20:44 ` Frank Rowand
2019-02-20 20:47 ` Frank Rowand
2019-02-28 3:52 ` Brendan Higgins
2019-03-22 0:22 ` Frank Rowand
2019-03-22 1:30 ` Brendan Higgins
2019-03-22 1:47 ` Frank Rowand
2019-03-25 22:15 ` Brendan Higgins
2019-09-20 16:57 ` Rob Herring
2019-09-21 23:57 ` Frank Rowand
2019-03-22 1:34 ` Frank Rowand
2019-03-25 22:18 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 19/19] of: unittest: split up some super large test cases Brendan Higgins
2018-11-28 19:36 ` [RFC v3 16/19] arch: um: make UML unflatten device tree when testing Brendan Higgins
2018-11-28 21:16 ` Rob Herring
[not found] ` <CAL_JsqK5cG=QzMBFSZ31_-3ujnxqxv=jj3XYajbRLT7yWYZbfw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-12-04 0:00 ` Brendan Higgins
2018-11-30 3:46 ` Luis Chamberlain
2018-12-04 0:02 ` Brendan Higgins
2018-12-04 10:52 ` [RFC v3 00/19] kunit: introduce KUnit, the Linux kernel unit testing framework Frank Rowand
2018-12-04 11:40 ` Frank Rowand
2018-12-04 13:49 ` Rob Herring
2018-12-05 23:10 ` Brendan Higgins
2019-03-22 0:27 ` Frank Rowand
2019-03-25 22:04 ` Brendan Higgins
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