From patchwork Mon Aug 12 18:24:06 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brendan Higgins X-Patchwork-Id: 11090461 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 2F270112C for ; Mon, 12 Aug 2019 18:24:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1F50428477 for ; Mon, 12 Aug 2019 18:24:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 120CA28595; Mon, 12 Aug 2019 18:24:50 +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=-2.7 required=2.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 7959E28468 for ; Mon, 12 Aug 2019 18:24:49 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id E6CB02130A504; Mon, 12 Aug 2019 11:27:08 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=2607:f8b0:4864:20::54a; helo=mail-pg1-x54a.google.com; envelope-from=37q5rxq4kdimiylukhuopnnpuznvvnsl.jvtspu14-u2kpttspz0z.78.vyn@flex--brendanhiggins.bounces.google.com; receiver=linux-nvdimm@lists.01.org Received: from mail-pg1-x54a.google.com (mail-pg1-x54a.google.com [IPv6:2607:f8b0:4864:20::54a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 33129212B0FED for ; Mon, 12 Aug 2019 11:27:07 -0700 (PDT) Received: by mail-pg1-x54a.google.com with SMTP id m17so56152737pgh.21 for ; Mon, 12 Aug 2019 11:24:47 -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=pJv5HABph5FUlcwnI++MYtn3UsN0gFtrxBAJYf9YQW0=; b=QEpE3GjsD9zFKs71nGTBAfMyLainCV5U3pvyn3IyTeO9b70dASmJQOSw/n5m7axwBT 2jDnpN75NrkG/5zQZSVNXgHcEfW1LTtf0/wA4UuLHuBdvWaSOicAx2Qb/uyPkYiCCW0J 9jB3FNeAlkTkONPoAgF/FLWAgm2LDH9m12q5u8laOFDLP7h80vn4IpQvFwA+3W2Em6Gy 6AyR3fRxLR/3JtnuiDf2V6xnihPgw1v1l0RAWfSACs5EhSLkIMket85QzpcLinHsAXEq JnTwG9iSbnHi8TqgQV0yVQshi9oWq/d1ma54ECb8Ovyk4eA3PFn3kk6XZMKKjBacrcWM CSAA== 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=pJv5HABph5FUlcwnI++MYtn3UsN0gFtrxBAJYf9YQW0=; b=CF7YFo9Eb0wzhFwMdxrK6wFw6iHW5/wZ8D9FYUWC+BawhBnDXIXdtU1/zzNI9M395a aZBnffB1zWIX/7s3naIJjWooTZaoueOu3vdr6oZbgoaP+bTQHtHlyVe7h/XkDoJAIKBA C/v3zxEj0yAWflfsXzPFPKhj1QbtRmHYfBIB3vCdZZb+WeXU+L/gcC3vyB6Z72uIscC5 EKEjsrihouzqerBRqoHkTDWj5H1pHxgGxn+GQ0mV0Ku//GGpN4WH/23XmHKbtk6fNt58 XjL8DfX1yJN7XP5SDq46kFWhVh7wudUavOwUtSS758XhsM+X4Dji3UkIsxqr7/BbjcF+ e2rg== X-Gm-Message-State: APjAAAWBCA3Ihq+PuH2U7yRuVYIXdWl3ifdvQrILhSTJEm/IQ5OONCTH 4nenc4NouuVuZFofkdCQLA2ODtfjF3Mq/GAvQ3a5vg== X-Google-Smtp-Source: APXvYqw4sOn9Y9TlUOBo/vo3Nnszkv9bDrP6M0fzpcRJtFWD0bGjJRxxqAdM5K0WV6WkEV1R6TncbxAp4kQa3YgEhxHreQ== X-Received: by 2002:a63:c008:: with SMTP id h8mr32244105pgg.427.1565634286919; Mon, 12 Aug 2019 11:24:46 -0700 (PDT) Date: Mon, 12 Aug 2019 11:24:06 -0700 In-Reply-To: <20190812182421.141150-1-brendanhiggins@google.com> Message-Id: <20190812182421.141150-4-brendanhiggins@google.com> Mime-Version: 1.0 References: <20190812182421.141150-1-brendanhiggins@google.com> X-Mailer: git-send-email 2.23.0.rc1.153.gdeed80330f-goog Subject: [PATCH v12 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 X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pmladek@suse.com, linux-doc@vger.kernel.org, amir73il@gmail.com, Brendan Higgins , dri-devel@lists.freedesktop.org, Alexander.Levin@microsoft.com, linux-kselftest@vger.kernel.org, linux-nvdimm@lists.01.org, khilman@baylibre.com, knut.omang@oracle.com, wfg@linux.intel.com, joel@jms.id.au, rientjes@google.com, jdike@addtoit.com, dan.carpenter@oracle.com, devicetree@vger.kernel.org, linux-kbuild@vger.kernel.org, Tim.Bird@sony.com, linux-um@lists.infradead.org, rostedt@goodmis.org, julia.lawall@lip6.fr, kunit-dev@googlegroups.com, richard@nod.at, rdunlap@infradead.org, linux-kernel@vger.kernel.org, daniel@ffwll.ch, mpe@ellerman.id.au, linux-fsdevel@vger.kernel.org Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" 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. string_stream is really just a string builder, nothing more. 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 | 152 ++++++++++++++++++++++++++++++++++ 3 files changed, 203 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..4fa107e38deb5 --- /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 + +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 *test; + gfp_t gfp; +}; + +struct kunit; + +struct string_stream *alloc_string_stream(struct kunit *test, gfp_t gfp); + +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); + +int string_stream_append(struct string_stream *stream, + struct string_stream *other); + +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..bcd56d6755544 --- /dev/null +++ b/kunit/string-stream.c @@ -0,0 +1,152 @@ +// 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; + + /* 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 = kunit_kmalloc(stream->test, sizeof(*frag_container), + stream->gfp); + if (!frag_container) + return -ENOMEM; + + frag_container->fragment = kunit_kmalloc(stream->test, len, + stream->gfp); + if (!frag_container->fragment) + return -ENOMEM; + + len = vsnprintf(frag_container->fragment, len, fmt, args); + spin_lock(&stream->lock); + stream->length += len; + list_add_tail(&frag_container->node, &stream->fragments); + spin_unlock(&stream->lock); + + 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; + + spin_lock(&stream->lock); + list_for_each_entry_safe(frag_container, + frag_container_safe, + &stream->fragments, + node) { + list_del(&frag_container->node); + } + stream->length = 0; + spin_unlock(&stream->lock); +} + +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; + + buf = kunit_kzalloc(stream->test, buf_len, stream->gfp); + if (!buf) + return NULL; + + spin_lock(&stream->lock); + list_for_each_entry(frag_container, &stream->fragments, node) + strlcat(buf, frag_container->fragment, buf_len); + spin_unlock(&stream->lock); + + return buf; +} + +int string_stream_append(struct string_stream *stream, + struct string_stream *other) +{ + const char *other_content; + + other_content = string_stream_get_string(other); + + if (!other_content) + return -ENOMEM; + + return string_stream_add(stream, other_content); +} + +bool string_stream_is_empty(struct string_stream *stream) +{ + return list_empty(&stream->fragments); +} + +struct string_stream_alloc_context { + struct kunit *test; + gfp_t gfp; +}; + +static int string_stream_init(struct kunit_resource *res, void *context) +{ + struct string_stream *stream; + struct string_stream_alloc_context *ctx = context; + + stream = kunit_kzalloc(ctx->test, sizeof(*stream), ctx->gfp); + if (!stream) + return -ENOMEM; + + res->allocation = stream; + stream->gfp = ctx->gfp; + stream->test = ctx->test; + INIT_LIST_HEAD(&stream->fragments); + spin_lock_init(&stream->lock); + + return 0; +} + +static void string_stream_free(struct kunit_resource *res) +{ + /* Nothing to do since everything is already a KUnit managed resource */ +} + +struct string_stream *alloc_string_stream(struct kunit *test, gfp_t gfp) +{ + struct string_stream_alloc_context context = { + .test = test, + .gfp = gfp + }; + + return kunit_alloc_resource(test, + string_stream_init, + string_stream_free, + gfp, + &context); +}