From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9F415C4360F for ; Thu, 4 Apr 2019 22:12:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 60CEB217D9 for ; Thu, 4 Apr 2019 22:12:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="K/olchrB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730665AbfDDWMB (ORCPT ); Thu, 4 Apr 2019 18:12:01 -0400 Received: from mail-io1-f73.google.com ([209.85.166.73]:49856 "EHLO mail-io1-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730567AbfDDWKK (ORCPT ); Thu, 4 Apr 2019 18:10:10 -0400 Received: by mail-io1-f73.google.com with SMTP id z6so3158989ioh.16 for ; Thu, 04 Apr 2019 15:10:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=wKxzJFaShASQUPZDqYNPu0TXHFOedzxEf0Q8Cs2Imqs=; b=K/olchrBgYojss1ShLaC54ZgUit5ZbkPFpnFMC14VFQgxcm937N8YTDmS1+tWbK3C9 ypEcCcKHIoPEs+/5vYL5tjxIVVnBMHHbR9pRyRn5IeloR3Wxn9TZLssJnimEUJPFNOai atrtI4NhRZjjmwc52hE0fQv3TNExg9DIExK8chHpbBctcKxw3Ltynkf15vlRpmH1yzXN 6hyeh6c0UWJyofbyppVpIYSErGUGL9aP/i0NF2i+hd5cJaH9AoDVBeA7gFA+eywhc5yq i+8B6pQLFZWQx+LTHeOqD5pdQ/erjxdd7jistL/jZ5NtkhQQdVNtw86G3zKgjXevYhfb IrOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=wKxzJFaShASQUPZDqYNPu0TXHFOedzxEf0Q8Cs2Imqs=; b=jmOskg7IIqVjE1mfRgQ0QJ0i0go+6ZJdxLTqjBEA/dKRNVQQ6465DM1Wk7B7YaIFCT AU3shbwcZM2qYnxh2lEc8sJjjMuG1a53eekH6D0jzFSePgJx/NQdX2FJkelyj+7JTs5Q EXMnjJVZykwP2ZxEyFinABkc6pO/9A8/864sNdliU8+/nZTnKzq+QaeHx1BBVTpZc38q R71cXo66c/VChfnABDRQY/3KPX1nbv8Rw8+KCpm8qXWuBTqjcg+H63S6F4qi2/b9U3AX jM7uZFUHkeldRHGdIYp6CizcvHB4ObcUt9FcXHZQB7OaZbsrcUP9o4bfJcyt9kDLlVjA 2//w== X-Gm-Message-State: APjAAAVZJodIPqXuQPe3hmmaf4mS3Zum1tiRS4IG3H/D1OzADardRYfN s4r8lOF9TZTIHSrJeYlw6NwLEIwPsAAPefeijyHccQ== X-Google-Smtp-Source: APXvYqyipF3/vxkM9zoVIq5Upxc7QdUxom6tVA8XE2keaddA1+05TZjRpqP8VGABmqMrjJZVX184VZdehl2snAa96oep8Q== X-Received: by 2002:a24:64e:: with SMTP id 75mr1796712itv.6.1554415809010; Thu, 04 Apr 2019 15:10:09 -0700 (PDT) Date: Thu, 4 Apr 2019 15:06:38 -0700 In-Reply-To: <20190404220652.19765-1-brendanhiggins@google.com> Message-Id: <20190404220652.19765-4-brendanhiggins@google.com> Mime-Version: 1.0 References: <20190404220652.19765-1-brendanhiggins@google.com> X-Mailer: git-send-email 2.21.0.392.gf8f6787159e-goog Subject: [PATCH v1 03/17] kunit: test: add string_stream a std::stream like string builder From: Brendan Higgins To: corbet@lwn.net, frowand.list@gmail.com, keescook@google.com, kieran.bingham@ideasonboard.com, mcgrof@kernel.org, robh@kernel.org, shuah@kernel.org, yamada.masahiro@socionext.com Cc: devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, kunit-dev@googlegroups.com, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-nvdimm@lists.01.org, linux-um@lists.infradead.org, Alexander.Levin@microsoft.com, Tim.Bird@sony.com, amir73il@gmail.com, dan.carpenter@oracle.com, dan.j.williams@intel.com, daniel@ffwll.ch, gregkh@linuxfoundation.org, jdike@addtoit.com, joel@jms.id.au, julia.lawall@lip6.fr, khilman@baylibre.com, knut.omang@oracle.com, mpe@ellerman.id.au, pmladek@suse.com, richard@nod.at, rostedt@goodmis.org, wfg@linux.intel.com, Brendan Higgins Content-Type: text/plain; charset="UTF-8" Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.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 --- include/kunit/string-stream.h | 51 ++++++++++++ kunit/Makefile | 3 +- kunit/string-stream.c | 144 ++++++++++++++++++++++++++++++++++ 3 files changed, 197 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..567a4629406da --- /dev/null +++ b/include/kunit/string-stream.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * C++ stream style string builder used in KUnit for building messages. + * + * Copyright (C) 2019, Google LLC. + * Author: Brendan Higgins + */ + +#ifndef _KUNIT_STRING_STREAM_H +#define _KUNIT_STRING_STREAM_H + +#include +#include +#include +#include + +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; +}; + +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); + +int string_stream_add(struct string_stream *this, const char *fmt, ...); + +int string_stream_vadd(struct string_stream *this, + const char *fmt, + va_list args); + +char *string_stream_get_string(struct string_stream *this); + +void string_stream_clear(struct string_stream *this); + +bool string_stream_is_empty(struct string_stream *this); + +#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..7018194ecf2fa --- /dev/null +++ b/kunit/string-stream.c @@ -0,0 +1,144 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * C++ stream style string builder used in KUnit for building messages. + * + * Copyright (C) 2019, Google LLC. + * Author: Brendan Higgins + */ + +#include +#include +#include + +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; +} + +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; +} + +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); +} + +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; +} + +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) +{ + string_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); + 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); +} + -- 2.21.0.392.gf8f6787159e-goog