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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3F64BC433EF for ; Wed, 13 Oct 2021 15:48:26 +0000 (UTC) Received: from phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A5ACF60E97 for ; Wed, 13 Oct 2021 15:48:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org A5ACF60E97 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.denx.de Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id F12A48375C; Wed, 13 Oct 2021 17:47:25 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=pass (p=none dis=none) header.from=kernel.org Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de Authentication-Results: phobos.denx.de; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="TCxNA/tK"; dkim-atps=neutral Received: by phobos.denx.de (Postfix, from userid 109) id 2DD8A835D0; Wed, 13 Oct 2021 17:46:28 +0200 (CEST) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by phobos.denx.de (Postfix) with ESMTPS id 7B849835CD for ; Wed, 13 Oct 2021 17:46:16 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=pass (p=none dis=none) header.from=kernel.org Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=kabel@kernel.org Received: by mail.kernel.org (Postfix) with ESMTPSA id 59A2961154; Wed, 13 Oct 2021 15:46:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1634139975; bh=mjo7ImDQbT0KCem6Jp6W9RA8S7gKS0O8nBO+xhyud94=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TCxNA/tK8D//36RVWJFTF9+NFjdFjfOgnXSbUcXciq6rl0mmDqD6bd1YHtDld9kBv KAQI3AhddU4HTTzd0xLr8QNsBwhY8vEy3LMT4QCmXS2Z/cA7lpq/+Aarmda+KnribA nlTH6A7HDFAjMyTMeeHuDei7qDFjFeopxq6xJyyub4tvYjvQb0m0uKy1Pqg3PH6O0T iuWg+kpm0C46KqSSyM1Jghz42SdTQvoOGVIq1JqmvirirfZgm+BxCel3GD/0Ll4Pq8 QBiA22BKyAo+mfMgeIK2cdE3gnnRX+VCX0pl2WXVgLTDAza9vrXcdHecEq6608Lj4Z 0a6HNv0cMZW0A== From: =?UTF-8?q?Marek=20Beh=C3=BAn?= To: Simon Glass , Tom Rini Cc: U-Boot Mailing List , =?UTF-8?q?Marek=20Beh=C3=BAn?= Subject: [PATCH v2 11/13] env: Make return value of env_get_f() behave like sprintf() on success Date: Wed, 13 Oct 2021 17:45:55 +0200 Message-Id: <20211013154557.28479-12-kabel@kernel.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211013154557.28479-1-kabel@kernel.org> References: <20211013154557.28479-1-kabel@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.34 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.2 at phobos.denx.de X-Virus-Status: Clean From: Marek Behún Currently the env_get_f() function's return value behaves weirdly: it returns the number of bytes written into `buf`, but whether this is excluding the terminating NULL-byte or including it depends on whether there was enough space in `buf`. Change the function to always return the actual length of the value of the environment variable (excluding the terminating NULL-byte) on success. This makes it behave like sprintf(). All users of this function in U-Boot are compatible with this change. Signed-off-by: Marek Behún --- cmd/nvedit.c | 8 +++++--- include/env.h | 6 ++---- 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/cmd/nvedit.c b/cmd/nvedit.c index 08288fad10..8989c85d20 100644 --- a/cmd/nvedit.c +++ b/cmd/nvedit.c @@ -736,7 +736,7 @@ int env_get_f(const char *name, char *buf, unsigned len) for (p = env; *p != '\0'; p = end + 1) { const char *value; - int n; + int n, res; for (end = p; *end != '\0'; ++end) if (end - env >= CONFIG_ENV_SIZE) @@ -746,11 +746,13 @@ int env_get_f(const char *name, char *buf, unsigned len) if (value == NULL) continue; + res = end - value; + /* found; copy out */ for (n = 0; n < len; ++n, ++buf) { *buf = *value++; if (*buf == '\0') - return n; + return res; } if (n) @@ -759,7 +761,7 @@ int env_get_f(const char *name, char *buf, unsigned len) printf("env_buf [%u bytes] too small for value of \"%s\"\n", len, name); - return n; + return res; } return -1; diff --git a/include/env.h b/include/env.h index 220ab979d9..ee5e30d036 100644 --- a/include/env.h +++ b/include/env.h @@ -120,10 +120,8 @@ char *from_env(const char *envvar); * support reading the value (slowly) and some will not. * * @varname: Variable to look up - * @return number of bytes written into @buf, excluding the terminating - * NULL-byte if there was enough space in @buf, and including the - * terminating NULL-byte if there wasn't enough space, or -1 if the - * variable is not found + * @return actual length of the variable value excluding the terminating + * NULL-byte, or -1 if the variable is not found */ int env_get_f(const char *name, char *buf, unsigned int len); -- 2.32.0