From patchwork Tue Jul 9 06:30:08 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brendan Higgins X-Patchwork-Id: 11036211 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 16A0E13BD for ; Tue, 9 Jul 2019 06:33:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 076E42873E for ; Tue, 9 Jul 2019 06:33:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EF0A128738; Tue, 9 Jul 2019 06:33:13 +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 4E1E22871F for ; Tue, 9 Jul 2019 06:33:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726444AbfGIGdK (ORCPT ); Tue, 9 Jul 2019 02:33:10 -0400 Received: from mail-pg1-f201.google.com ([209.85.215.201]:39884 "EHLO mail-pg1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726427AbfGIGdJ (ORCPT ); Tue, 9 Jul 2019 02:33:09 -0400 Received: by mail-pg1-f201.google.com with SMTP id t19so12063135pgh.6 for ; Mon, 08 Jul 2019 23:33:09 -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=ef4x4rIYEjXAUsOwLGAl/ehMOJtbGdS1NNHHbtE3RYE=; b=mLx6609ZySSkYbJlNuOpMjZGrZd8IOlvTf7emjGKZpw4sMgoHG7jOtDJl9Hs/0uKbp CWcaU3WKwPiDvKip9ROWZc+GSLlsveOHCD2ZVlcou2jzIh0L944rG1SBsuZTcOW+GnxT yJos4kZ6BW3EWVzuRhH5fqflYQ0bONHOXCAZU5hEedcE4r2519XITrzSy/RKJ3w8rgsr M7YHIkzVnMrzOowlBPGB6hixQCjy/oI28/AFB3Nf7U0HkwHFqcjYy0qSR/Qy7Exmz+s2 m355D6kHBcld/dH7MYWvY7hdP/OJi9u2DnTAsT5pZB3V/EK+xzumvNGPoKnUhfRNZYiW 4A6Q== 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=ef4x4rIYEjXAUsOwLGAl/ehMOJtbGdS1NNHHbtE3RYE=; b=lpWd6gYHUdWAgFe/+y4oFqCjFnTeb7h/+rKjQn0beKDQu1VVh7MhZoi3+haxO1gWlV mSkcmpqTzTBfeZC0F4mjyRamm5jiG1ecUd5O8XGpcSTsOh/rVojuFr5FQHe4VtGRgZny 5pYKT8F9Js7UW+ufUd12oIeIdMxhlFua1cz+glOSWvx2LRAIlg7Y4jkLaysuj6FaH7J/ awJ0OCAjd5TMyxNnjLrKCkzKYpYwxU9PNVc4tmDd1F0jVxzZZfMnhTM6DFYHOiIGDxNn QSKw2u456dMtGosy/TE7DTb2HstbMMwDJ3fGwh2RceHQ3sBQa0qBKg5Db7jMJogJy37/ aN7Q== X-Gm-Message-State: APjAAAVLMpyRFdAGGjH/dK+pIJBJ0GbFTu/TMCw1paGLpBTwGM5jrgKB +jrhxiwrjWc2B4wxCnsjUIbLg2uzqHVm5M1FZqP+gw== X-Google-Smtp-Source: APXvYqwZ+505KDjIDCXeL5etowMmvMu9OFM8WzuyaXIrNLa66R1wXIKIU+82dz+k7CooH7yg76EV/lmsDIR9B1c/Y32KoQ== X-Received: by 2002:a63:2bd2:: with SMTP id r201mr28086602pgr.193.1562653988426; Mon, 08 Jul 2019 23:33:08 -0700 (PDT) Date: Mon, 8 Jul 2019 23:30:08 -0700 In-Reply-To: <20190709063023.251446-1-brendanhiggins@google.com> Message-Id: <20190709063023.251446-4-brendanhiggins@google.com> Mime-Version: 1.0 References: <20190709063023.251446-1-brendanhiggins@google.com> X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog Subject: [PATCH v7 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 | 49 ++++++++++++ kunit/Makefile | 3 +- kunit/string-stream.c | 147 ++++++++++++++++++++++++++++++++++ 3 files changed, 198 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..0552a05781afe --- /dev/null +++ b/include/kunit/string-stream.h @@ -0,0 +1,49 @@ +/* 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 kunit; + +struct string_stream *alloc_string_stream(struct kunit *test); + +void string_stream_get(struct string_stream *stream); + +int string_stream_put(struct string_stream *stream); + +int string_stream_add(struct string_stream *stream, const char *fmt, ...); + +int string_stream_vadd(struct string_stream *stream, + const char *fmt, + va_list args); + +char *string_stream_get_string(struct string_stream *stream); + +void string_stream_clear(struct string_stream *stream); + +bool string_stream_is_empty(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..0463a92dad74b --- /dev/null +++ b/kunit/string-stream.c @@ -0,0 +1,147 @@ +// 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 +#include + +int string_stream_vadd(struct string_stream *stream, + 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(&stream->lock, flags); + stream->length += len; + list_add_tail(&frag_container->node, &stream->fragments); + spin_unlock_irqrestore(&stream->lock, flags); + + return 0; +} + +int string_stream_add(struct string_stream *stream, const char *fmt, ...) +{ + va_list args; + int result; + + va_start(args, fmt); + result = string_stream_vadd(stream, fmt, args); + va_end(args); + + return result; +} + +void string_stream_clear(struct string_stream *stream) +{ + struct string_stream_fragment *frag_container, *frag_container_safe; + unsigned long flags; + + spin_lock_irqsave(&stream->lock, flags); + list_for_each_entry_safe(frag_container, + frag_container_safe, + &stream->fragments, + node) { + list_del(&frag_container->node); + kfree(frag_container->fragment); + kfree(frag_container); + } + stream->length = 0; + spin_unlock_irqrestore(&stream->lock, flags); +} + +char *string_stream_get_string(struct string_stream *stream) +{ + struct string_stream_fragment *frag_container; + size_t buf_len = stream->length + 1; /* +1 for null byte. */ + char *buf; + unsigned long flags; + + buf = kzalloc(buf_len, GFP_KERNEL); + if (!buf) + return NULL; + + spin_lock_irqsave(&stream->lock, flags); + list_for_each_entry(frag_container, &stream->fragments, node) + strlcat(buf, frag_container->fragment, buf_len); + spin_unlock_irqrestore(&stream->lock, flags); + + return buf; +} + +bool string_stream_is_empty(struct string_stream *stream) +{ + bool is_empty; + unsigned long flags; + + spin_lock_irqsave(&stream->lock, flags); + is_empty = list_empty(&stream->fragments); + spin_unlock_irqrestore(&stream->lock, flags); + + return is_empty; +} + +static int string_stream_init(struct kunit_resource *res, void *context) +{ + struct string_stream *stream; + + stream = kzalloc(sizeof(*stream), GFP_KERNEL); + if (!stream) + return -ENOMEM; + + res->allocation = stream; + INIT_LIST_HEAD(&stream->fragments); + spin_lock_init(&stream->lock); + + return 0; +} + +static void string_stream_free(struct kunit_resource *res) +{ + struct string_stream *stream = res->allocation; + + string_stream_clear(stream); + kfree(stream); +} + +struct string_stream *alloc_string_stream(struct kunit *test) +{ + struct kunit_resource *res; + + res = kunit_alloc_resource(test, + string_stream_init, + string_stream_free, + NULL); + + if (!res) + return NULL; + + return res->allocation; +}