From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ot1-x34a.google.com ([2607:f8b0:4864:20::34a]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hcmya-00075s-D7 for linux-um@lists.infradead.org; Mon, 17 Jun 2019 08:26:53 +0000 Received: by mail-ot1-x34a.google.com with SMTP id f36so4604672otf.7 for ; Mon, 17 Jun 2019 01:26:50 -0700 (PDT) Date: Mon, 17 Jun 2019 01:25:58 -0700 In-Reply-To: <20190617082613.109131-1-brendanhiggins@google.com> Message-Id: <20190617082613.109131-4-brendanhiggins@google.com> Mime-Version: 1.0 References: <20190617082613.109131-1-brendanhiggins@google.com> Subject: [PATCH v5 03/18] kunit: test: add string_stream a std::stream like string builder From: Brendan Higgins List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-um" Errors-To: linux-um-bounces+geert=linux-m68k.org@lists.infradead.org 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: 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, logang@deltatee.com 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 --- Changes Since Last Revision: - Renamed new_string_stream() to alloc_string_stream() as suggested by Stephen Boyd. - Made string-stream a KUnit managed object - based on a suggestion made by Stephen Boyd. - Made a number of other small changes like renaming parameters as suggested by Stephen Boyd. --- 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; +} -- 2.22.0.410.gd8fdbe21b5-goog _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um