From patchwork Mon Sep 4 09:50:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Clark X-Patchwork-Id: 13373669 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 65E53C71153 for ; Mon, 4 Sep 2023 09:53:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=cyJZi4rW0ugSllwuD/X0SRMjE5M3XgO9ieJOI4PfHRk=; b=NLQxAGkaWbWdLH Vsz1soQrGrGrg6jWuCwg2WmvGrUNq5EtXiSvu1s1eHUE34WtkYwQ0aZqkjJFgB3GKKV0YucfuDL+E y1JyH7BJ6x/9DGKSZklzHFuOqigZtpydmMnqp1bgLF0fK4FE+9VsotnhO/zRAE45Nf1jXEMowYscz WB4nJMOAwKHcmwoK3b2oPesYGKF1Ovd8Nu+5BWMEITgtzX4MiS1zyVEoDZbZMUeR+TO+d+yLQgAfQ EQnkL5FOG7k8HpOPB1ndpGMJ6TcFyqohmD7kRgtwWP9mZIUMM6cL6mRC1rAKGcCndSEuACy4PSvR8 Kj0n/vbzt2M1jNADzx7Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qd6GN-003igf-0p; Mon, 04 Sep 2023 09:52:55 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qd6GH-003ieH-1m for linux-arm-kernel@lists.infradead.org; Mon, 04 Sep 2023 09:52:53 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 3DDBC1042; Mon, 4 Sep 2023 02:53:25 -0700 (PDT) Received: from localhost.localdomain (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id EB2EC3F793; Mon, 4 Sep 2023 02:52:43 -0700 (PDT) From: James Clark To: linux-perf-users@vger.kernel.org, irogers@google.com Cc: James Clark , John Garry , Will Deacon , Mike Leach , Leo Yan , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Adrian Hunter , Kan Liang , Haixin Yu , Jing Zhang , Kajol Jain , Madhavan Srinivasan , Ravi Bangoria , Yang Jihong , Eduard Zingerman , Chen Zhongjin , Liam Howlett , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 3/7] perf util: Add a function for replacing characters in a string Date: Mon, 4 Sep 2023 10:50:45 +0100 Message-Id: <20230904095104.1162928-4-james.clark@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230904095104.1162928-1-james.clark@arm.com> References: <20230904095104.1162928-1-james.clark@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230904_025249_687918_B9A52803 X-CRM114-Status: GOOD ( 21.39 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org It finds all occurrences of a single character and replaces them with a multi character string. This will be used in a test in a following commit. Reviewed-by: Ian Rogers Signed-off-by: James Clark --- tools/perf/tests/Build | 1 + tools/perf/tests/builtin-test.c | 1 + tools/perf/tests/tests.h | 1 + tools/perf/tests/util.c | 31 +++++++++++++++++++++ tools/perf/util/string.c | 48 +++++++++++++++++++++++++++++++++ tools/perf/util/string2.h | 1 + 6 files changed, 83 insertions(+) create mode 100644 tools/perf/tests/util.c diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build index 63d5e6d5f165..2b45ffa462a6 100644 --- a/tools/perf/tests/Build +++ b/tools/perf/tests/Build @@ -66,6 +66,7 @@ perf-y += dlfilter-test.o perf-y += sigtrap.o perf-y += event_groups.o perf-y += symbols.o +perf-y += util.o ifeq ($(SRCARCH),$(filter $(SRCARCH),x86 arm arm64 powerpc)) perf-$(CONFIG_DWARF_UNWIND) += dwarf-unwind.o diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c index 0ad18cf6dd22..cb6f1dd00dc4 100644 --- a/tools/perf/tests/builtin-test.c +++ b/tools/perf/tests/builtin-test.c @@ -123,6 +123,7 @@ static struct test_suite *generic_tests[] = { &suite__sigtrap, &suite__event_groups, &suite__symbols, + &suite__util, NULL, }; diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h index f33cfc3c19a4..b394f3ac2d66 100644 --- a/tools/perf/tests/tests.h +++ b/tools/perf/tests/tests.h @@ -145,6 +145,7 @@ DECLARE_SUITE(dlfilter); DECLARE_SUITE(sigtrap); DECLARE_SUITE(event_groups); DECLARE_SUITE(symbols); +DECLARE_SUITE(util); /* * PowerPC and S390 do not support creation of instruction breakpoints using the diff --git a/tools/perf/tests/util.c b/tools/perf/tests/util.c new file mode 100644 index 000000000000..6366db5cbf8c --- /dev/null +++ b/tools/perf/tests/util.c @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "tests.h" +#include "util/debug.h" + +#include +#include +#include + +static int test_strreplace(char needle, const char *haystack, + const char *replace, const char *expected) +{ + char *new = strreplace_chars(needle, haystack, replace); + int ret = strcmp(new, expected); + + free(new); + return ret == 0; +} + +static int test__util(struct test_suite *t __maybe_unused, int subtest __maybe_unused) +{ + TEST_ASSERT_VAL("empty string", test_strreplace(' ', "", "123", "")); + TEST_ASSERT_VAL("no match", test_strreplace('5', "123", "4", "123")); + TEST_ASSERT_VAL("replace 1", test_strreplace('3', "123", "4", "124")); + TEST_ASSERT_VAL("replace 2", test_strreplace('a', "abcabc", "ef", "efbcefbc")); + TEST_ASSERT_VAL("replace long", test_strreplace('a', "abcabc", "longlong", + "longlongbclonglongbc")); + + return 0; +} + +DEFINE_SUITE("util", util); diff --git a/tools/perf/util/string.c b/tools/perf/util/string.c index cf05b0b56c57..116a642ad99d 100644 --- a/tools/perf/util/string.c +++ b/tools/perf/util/string.c @@ -301,3 +301,51 @@ unsigned int hex(char c) return c - 'a' + 10; return c - 'A' + 10; } + +/* + * Replace all occurrences of character 'needle' in string 'haystack' with + * string 'replace' + * + * The new string could be longer so a new string is returned which must be + * freed. + */ +char *strreplace_chars(char needle, const char *haystack, const char *replace) +{ + int replace_len = strlen(replace); + char *new_s, *to; + const char *loc = strchr(haystack, needle); + const char *from = haystack; + int num = 0; + + /* Count occurrences */ + while (loc) { + loc = strchr(loc + 1, needle); + num++; + } + + /* Allocate enough space for replacements and reset first location */ + new_s = malloc(strlen(haystack) + (num * (replace_len - 1) + 1)); + if (!new_s) + return NULL; + loc = strchr(haystack, needle); + to = new_s; + + while (loc) { + /* Copy original string up to found char and update positions */ + memcpy(to, from, 1 + loc - from); + to += loc - from; + from = loc + 1; + + /* Copy replacement string and update positions */ + memcpy(to, replace, replace_len); + to += replace_len; + + /* needle next occurrence or end of string */ + loc = strchr(from, needle); + } + + /* Copy any remaining chars + null */ + strcpy(to, from); + + return new_s; +} diff --git a/tools/perf/util/string2.h b/tools/perf/util/string2.h index 56c30fef9682..52cb8ba057c7 100644 --- a/tools/perf/util/string2.h +++ b/tools/perf/util/string2.h @@ -39,5 +39,6 @@ char *strpbrk_esc(char *str, const char *stopset); char *strdup_esc(const char *str); unsigned int hex(char c); +char *strreplace_chars(char needle, const char *haystack, const char *replace); #endif /* PERF_STRING_H */