From mboxrd@z Thu Jan 1 00:00:00 1970 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12EC1ECAAD5 for ; Tue, 30 Aug 2022 21:52:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231997AbiH3Vwm (ORCPT ); Tue, 30 Aug 2022 17:52:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55782 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231950AbiH3Vvn (ORCPT ); Tue, 30 Aug 2022 17:51:43 -0400 Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 453D040541 for ; Tue, 30 Aug 2022 14:50:11 -0700 (PDT) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-33dbfb6d2a3so188947347b3.11 for ; Tue, 30 Aug 2022 14:50:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc; bh=PaZc/ErQmIz9CmZWuOwZKmMvFAFDhrfR0u4+oqULyqs=; b=hebs9Ab4jQ13PLVsrCINOWSpgoH5EATUTa9Cks3Eg1nmkxH7qE2oRwCx7AF5BNZXTH AHzIFQ24Or2oJnVcja+AOnCs2XgXBCldmNcsagLkjdyOLpIpceU0bsUf62DWg4fCi92e s30PWdmXxABwFMNU1JgUL6Fp0h2PBQ5hgdc0oQExPZeqJt/0xfqCgMF0cTxAmuBThoZJ frR4uwNwpRrRdJWEew4t7LzoFroWP+hLZBEH0mT+P1Yv4GgQEDG37uiXZMEF+0m6Voke PgoPiZ8qXrLB1DY6fUVv3gddg9c6Rea7O2e0xIyCiy2p7GROj3EzsKBaYmh74I5z0+5s 1/pA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc; bh=PaZc/ErQmIz9CmZWuOwZKmMvFAFDhrfR0u4+oqULyqs=; b=nXxxNQmwBOpybixpzU2m/3xDOv7jfPhGHB29uPu81RpubylBqQl9w5v/hxWzkJEVTi bW/Nv9UdoigCdmSc6GJcTt6+x5IwjqVIGiBF7r8Y6EkgDttgqm6odbBF71hE2tmTaqT1 /vXdSW25B/4085VILOeBHCh7r/yJW+hj4cmoN1ODmlF+3wFdK+N4tkZcF8Ow5Zsr30iK JDlC+eybNHgOtPGyhIk4qWZwXJVGVlSQOrJGewyhq/Im4y4AbVl1Epm1wmleT8l2nD/y gtuapOkngnJ4nzhJOJKr+50HxdRV/uS6PKIgFp/mu/EG5XwI5fkLpR9CCEuNJIQSKE3S g1MA== X-Gm-Message-State: ACgBeo10+DbRizgFYbTWWTnPzytRAo0hUerEOh7TUPMqxDzXwNBZJzwv icUTt78ueX5dS052lDezLMf1qEEeTPI= X-Google-Smtp-Source: AA6agR60bKzipuEg+9xXy+Pee21QZvBbTBPOhKhJO0fVzuHKtaTXE6dCUM7Zh4tN5bptU+EiRysnFAQW6po= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:200:a005:55b3:6c26:b3e4]) (user=surenb job=sendgmr) by 2002:a25:31d5:0:b0:677:28b:1451 with SMTP id x204-20020a2531d5000000b00677028b1451mr13217805ybx.437.1661896208990; Tue, 30 Aug 2022 14:50:08 -0700 (PDT) Date: Tue, 30 Aug 2022 14:49:06 -0700 In-Reply-To: <20220830214919.53220-1-surenb@google.com> Mime-Version: 1.0 References: <20220830214919.53220-1-surenb@google.com> X-Mailer: git-send-email 2.37.2.672.g94769d06f0-goog Message-ID: <20220830214919.53220-18-surenb@google.com> Subject: [RFC PATCH 17/30] lib/string.c: strsep_no_empty() From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: kent.overstreet@linux.dev, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, roman.gushchin@linux.dev, mgorman@suse.de, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, void@manifault.com, peterz@infradead.org, juri.lelli@redhat.com, ldufour@linux.ibm.com, peterx@redhat.com, david@redhat.com, axboe@kernel.dk, mcgrof@kernel.org, masahiroy@kernel.org, nathan@kernel.org, changbin.du@intel.com, ytcoode@gmail.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, bristot@redhat.com, vschneid@redhat.com, cl@linux.com, penberg@kernel.org, iamjoonsoo.kim@lge.com, 42.hyeyoo@gmail.com, glider@google.com, elver@google.com, dvyukov@google.com, shakeelb@google.com, songmuchun@bytedance.com, arnd@arndb.de, jbaron@akamai.com, rientjes@google.com, minchan@google.com, kaleshsingh@google.com, surenb@google.com, kernel-team@android.com, linux-mm@kvack.org, iommu@lists.linux.dev, kasan-dev@googlegroups.com, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, xen-devel@lists.xenproject.org, linux-bcache@vger.kernel.org, linux-modules@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org From: Kent Overstreet This adds a new helper which is like strsep, except that it skips empty tokens. Signed-off-by: Kent Overstreet --- include/linux/string.h | 1 + lib/string.c | 19 +++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/include/linux/string.h b/include/linux/string.h index 61ec7e4f6311..b950ac9cfa56 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -96,6 +96,7 @@ extern char * strpbrk(const char *,const char *); #ifndef __HAVE_ARCH_STRSEP extern char * strsep(char **,const char *); #endif +extern char *strsep_no_empty(char **, const char *); #ifndef __HAVE_ARCH_STRSPN extern __kernel_size_t strspn(const char *,const char *); #endif diff --git a/lib/string.c b/lib/string.c index 6f334420f687..6939f5b751f2 100644 --- a/lib/string.c +++ b/lib/string.c @@ -596,6 +596,25 @@ char *strsep(char **s, const char *ct) EXPORT_SYMBOL(strsep); #endif +/** + * strsep_no_empt - Split a string into tokens, but don't return empty tokens + * @s: The string to be searched + * @ct: The characters to search for + * + * strsep() updates @s to point after the token, ready for the next call. + */ +char *strsep_no_empty(char **s, const char *ct) +{ + char *ret; + + do { + ret = strsep(s, ct); + } while (ret && !*ret); + + return ret; +} +EXPORT_SYMBOL_GPL(strsep_no_empty); + #ifndef __HAVE_ARCH_MEMSET /** * memset - Fill a region of memory with the given value -- 2.37.2.672.g94769d06f0-goog