From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Mon, 11 Aug 2025 14:30:15 +0200 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1ulRfK-009KjN-39 for lore@lore.pengutronix.de; Mon, 11 Aug 2025 14:30:14 +0200 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1ulRf2-000653-Gp for lore@pengutronix.de; Mon, 11 Aug 2025 14:30:14 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=xoKbkDVn5eeW+nikGTQQ2R2ovVDDjY2DgN7kkiDx1RU=; b=1xjKNCVexay/lnMnoYy5jLcOsN zyIgpDWyH5WI5GfAvyoWpCgZKzAPL1ynDsKSudGoWdcd5PrNkVHcNJnGtjy08GM0Hj4ti+PtTfUZ3 /sGHLkYRMA6B0l0ZYkegtvaPGGocgvic4O93s5ipDnWW3UO1qiiaZSA/bIdLtPEKFhIh5CT9335+9 ws9AetBtSj6Pny4CmR1IHA4UyJg/vw5HWC4uteC55kIlJ5RO1/Dw7Iq0+Fv+tQSQ6Z6WI7MOXG8/6 iHb8iee/IRTvkQw5z8+BNTZXSyKllCUJWPyW/RGWS6S1T35EXFzzSMk1nQExzUOLm/WXP1FYxWp6P V8SZj/+w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1ulRe0-00000007e2U-3HCn; Mon, 11 Aug 2025 12:28:52 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1ulRdg-00000007dYt-1PEQ for barebox@lists.infradead.org; Mon, 11 Aug 2025 12:28:38 +0000 Received: from ptz.office.stw.pengutronix.de ([2a0a:edc0:0:900:1d::77] helo=geraet.fritz.box) by metis.whiteo.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1ulRdf-0004WP-3o; Mon, 11 Aug 2025 14:28:31 +0200 From: Ahmad Fatoum To: barebox@lists.infradead.org Cc: Ahmad Fatoum Date: Mon, 11 Aug 2025 14:27:59 +0200 Message-Id: <20250811122824.1667791-20-a.fatoum@barebox.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250811122824.1667791-1-a.fatoum@barebox.org> References: <20250811122824.1667791-1-a.fatoum@barebox.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250811_052832_396758_3B2232EF X-CRM114-Status: UNSURE ( 8.34 ) X-CRM114-Notice: Please train this message. X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-5.4 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH 19/44] string: implement strv_length helper X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) For calculating the length of an array of strings with a NULL sentinel, introduce a strv_length helper. Signed-off-by: Ahmad Fatoum --- include/string.h | 7 +++++++ lib/string.c | 17 +++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/include/string.h b/include/string.h index b54a8fc3f38a..71affe48b640 100644 --- a/include/string.h +++ b/include/string.h @@ -57,4 +57,11 @@ static inline bool is_nul_terminated(const char *val, size_t len) return strnlen(val, len) != len; } +typedef union { + char * const *sl; + const char * const *sl_const; +} strv_t __attribute__((transparent_union)); + +size_t strv_length(strv_t) __pure; + #endif /* __STRING_H */ diff --git a/lib/string.c b/lib/string.c index 96eac6d1daf6..73637cd9710a 100644 --- a/lib/string.c +++ b/lib/string.c @@ -1137,3 +1137,20 @@ char *strreplace(char *str, char old, char new) return str; } EXPORT_SYMBOL(strreplace); + +/** + * strv_length - calculate length of string vector + * @strv: NULL-terminated array of string + * + * Return: size of the vector + */ +size_t strv_length(const char * const *l) +{ + size_t n = 0; + + for (const char *const *s, *const *i = (l); (s = i) && *i; i++) + n++; + + return n; +} +EXPORT_SYMBOL(strv_length); -- 2.39.5