From patchwork Tue May 14 22:16:56 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brendan Higgins X-Patchwork-Id: 10943853 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2E5FE933 for ; Tue, 14 May 2019 22:18:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1E5E128893 for ; Tue, 14 May 2019 22:18:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0FB1228989; Tue, 14 May 2019 22:18:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E0AD728893 for ; Tue, 14 May 2019 22:18:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726336AbfENWS3 (ORCPT ); Tue, 14 May 2019 18:18:29 -0400 Received: from mail-pg1-f202.google.com ([209.85.215.202]:57282 "EHLO mail-pg1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726561AbfENWS3 (ORCPT ); Tue, 14 May 2019 18:18:29 -0400 Received: by mail-pg1-f202.google.com with SMTP id h14so409864pgn.23 for ; Tue, 14 May 2019 15:18:28 -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=RHK+DkRxPoN5Ta9skIWEgY3cj6EOLdr8oeXCdZEvhl0=; b=lCvap1CbBRpWKa60chkxUUpUIM5haN+he+WKhK25GdXIK5hUX/RdGr5FLyReiAzjlq +piyvGhXs3C63imE88fBwTgzOrpCMdC/hIrjG22oML4Xoxxp2Ir0+gi4IwFi3juZzcNP FDlQ1+SPYdS/KzKjHF5UkBfU/DqN5qw4YX95C90DOEb3GsrIrZr6X1JkmF30ItBR18C3 6uAV+izO+uYyBjEfp0AAivPBgH0CdxCRlxt+TYfkiYS3IcDkPqIsfXsdvhipGlYO0ZWZ F6v2GWJcPpz4sMZ9geu5riz3IWqiAK3S3X9ATJj0bBrhgY0UfriJVuD/5KMfWTgDPnJy hXpA== 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=RHK+DkRxPoN5Ta9skIWEgY3cj6EOLdr8oeXCdZEvhl0=; b=T+7lACuRDXOrig7blmxu2Db2KbxKawkFA7tB2+IMN/q4FTT4CkQDnUMrTcQVaGhUVa kJR4JwrmmdNxXN2QIHnc4YrJkyGG9wlYxcCXuBgvjfqcHcFp2GWDvY+3RyK8t+5ClrlK sXlBVxjiJkM7tpqCgrXk9oNbrEjqkGqB8JXIIoJxknFMbTiuagaKEPxnl834pewdphlE hsYONpYC97OwMAE9mfgt7THrvjCJZPOuqOKV8VrnOm1/1p1hwZcslytMIP5+5+v1PcFm YUeg8sqiEYrBmLCICwGbcq8NhRgsYMnt1F/LyIqroX/Y6kPdc+A1TGM6nuQp9LOERpth r3Fg== X-Gm-Message-State: APjAAAX+nyI+uZCyiOxaBS4erELFgByJ4NSnT8DBSrXSnWTKkCfHh1cM URrxmXbVPq3lX3memswuN7SoPALYs9c8l8Zhp8i8KQ== X-Google-Smtp-Source: APXvYqzNE8NPQQqF4Z1Nj8jy8v6cAcCNPbCs6h5W0dsh4rmoeyWcII2AbnTCDruGU77yI1lkapN6N8FC0SiKszlBSjvQ3w== X-Received: by 2002:a63:b00e:: with SMTP id h14mr36706979pgf.321.1557872307955; Tue, 14 May 2019 15:18:27 -0700 (PDT) Date: Tue, 14 May 2019 15:16:56 -0700 In-Reply-To: <20190514221711.248228-1-brendanhiggins@google.com> Message-Id: <20190514221711.248228-4-brendanhiggins@google.com> Mime-Version: 1.0 References: <20190514221711.248228-1-brendanhiggins@google.com> X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog Subject: [PATCH v4 03/18] kunit: test: add string_stream a std::stream like string builder From: Brendan Higgins To: frowand.list@gmail.com, gregkh@linuxfoundation.org, jpoimboe@redhat.com, keescook@google.com, kieran.bingham@ideasonboard.com, mcgrof@kernel.org, peterz@infradead.org, robh@kernel.org, sboyd@kernel.org, shuah@kernel.org, tytso@mit.edu, 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, daniel@ffwll.ch, jdike@addtoit.com, joel@jms.id.au, julia.lawall@lip6.fr, khilman@baylibre.com, knut.omang@oracle.com, logang@deltatee.com, mpe@ellerman.id.au, pmladek@suse.com, rdunlap@infradead.org, richard@nod.at, rientjes@google.com, rostedt@goodmis.org, wfg@linux.intel.com, Brendan Higgins Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 Reviewed-by: Greg Kroah-Hartman Reviewed-by: Logan Gunthorpe --- include/kunit/string-stream.h | 51 ++++++++++++ kunit/Makefile | 3 +- kunit/string-stream.c | 143 ++++++++++++++++++++++++++++++++++ 3 files changed, 196 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..d4e4252dc10b8 --- /dev/null +++ b/kunit/string-stream.c @@ -0,0 +1,143 @@ +// 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 *frag_container; + 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); + + frag_container = kmalloc(sizeof(*frag_container), GFP_KERNEL); + if (!frag_container) + return -ENOMEM; + + frag_container->fragment = kmalloc(len, GFP_KERNEL); + if (!frag_container->fragment) { + kfree(frag_container); + return -ENOMEM; + } + + len = vsnprintf(frag_container->fragment, len, fmt, args); + spin_lock_irqsave(&this->lock, flags); + this->length += len; + list_add_tail(&frag_container->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 *frag_container, *frag_container_safe; + unsigned long flags; + + spin_lock_irqsave(&this->lock, flags); + list_for_each_entry_safe(frag_container, + frag_container_safe, + &this->fragments, + node) { + list_del(&frag_container->node); + kfree(frag_container->fragment); + kfree(frag_container); + } + this->length = 0; + spin_unlock_irqrestore(&this->lock, flags); +} + +char *string_stream_get_string(struct string_stream *this) +{ + struct string_stream_fragment *frag_container; + 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(frag_container, &this->fragments, node) + strlcat(buf, frag_container->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); +}