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 X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A8B14C43331 for ; Tue, 2 Mar 2021 20:53:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 87E6560234 for ; Tue, 2 Mar 2021 20:53:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1837152AbhCBUvJ (ORCPT ); Tue, 2 Mar 2021 15:51:09 -0500 Received: from pegase1.c-s.fr ([93.17.236.30]:44895 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352008AbhCBRvJ (ORCPT ); Tue, 2 Mar 2021 12:51:09 -0500 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 4DqkXr0xnBz9v1C0; Tue, 2 Mar 2021 18:25:16 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id GmkJLeTlmTYY; Tue, 2 Mar 2021 18:25:16 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 4DqkXq6QS8z9v1Bx; Tue, 2 Mar 2021 18:25:15 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 9F8998B7B5; Tue, 2 Mar 2021 18:25:17 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id SpTJBwmTOVdC; Tue, 2 Mar 2021 18:25:17 +0100 (CET) Received: from po16121vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 633FD8B75F; Tue, 2 Mar 2021 18:25:17 +0100 (CET) Received: by localhost.localdomain (Postfix, from userid 0) id 32BC5674A2; Tue, 2 Mar 2021 17:25:17 +0000 (UTC) Message-Id: In-Reply-To: References: From: Christophe Leroy Subject: [PATCH v2 1/7] cmdline: Add generic function to build command line. To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , danielwa@cisco.com, robh@kernel.org, daniel@gimpelevich.san-francisco.ca.us Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arch@vger.kernel.org, devicetree@vger.kernel.org Date: Tue, 2 Mar 2021 17:25:17 +0000 (UTC) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This code provides architectures with a way to build command line based on what is built in the kernel and what is handed over by the bootloader, based on selected compile-time options. Signed-off-by: Christophe Leroy --- include/linux/cmdline.h | 62 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 include/linux/cmdline.h diff --git a/include/linux/cmdline.h b/include/linux/cmdline.h new file mode 100644 index 000000000000..ae3610bb0ee2 --- /dev/null +++ b/include/linux/cmdline.h @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_CMDLINE_H +#define _LINUX_CMDLINE_H + +static __always_inline size_t cmdline_strlen(const char *s) +{ + const char *sc; + + for (sc = s; *sc != '\0'; ++sc) + ; /* nothing */ + return sc - s; +} + +static __always_inline size_t cmdline_strlcat(char *dest, const char *src, size_t count) +{ + size_t dsize = cmdline_strlen(dest); + size_t len = cmdline_strlen(src); + size_t res = dsize + len; + + /* This would be a bug */ + if (dsize >= count) + return count; + + dest += dsize; + count -= dsize; + if (len >= count) + len = count - 1; + memcpy(dest, src, len); + dest[len] = 0; + return res; +} + +/* + * This function will append a builtin command line to the command + * line provided by the bootloader. Kconfig options can be used to alter + * the behavior of this builtin command line. + * @dest: The destination of the final appended/prepended string. + * @src: The starting string or NULL if there isn't one. Must not equal dest. + * @length: the length of dest buffer. + */ +static __always_inline void cmdline_build(char *dest, const char *src, size_t length) +{ + if (length <= 0) + return; + + dest[0] = 0; + +#ifdef CONFIG_CMDLINE + if (IS_ENABLED(CONFIG_CMDLINE_FORCE) || !src || !src[0]) { + cmdline_strlcat(dest, CONFIG_CMDLINE, length); + return; + } +#endif + if (dest != src) + cmdline_strlcat(dest, src, length); +#ifdef CONFIG_CMDLINE + if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && sizeof(CONFIG_CMDLINE) > 1) + cmdline_strlcat(dest, " " CONFIG_CMDLINE, length); +#endif +} + +#endif /* _LINUX_CMDLINE_H */ -- 2.25.0 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 X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3D2D4C433E0 for ; Tue, 2 Mar 2021 17:26:21 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8F45564F2E for ; Tue, 2 Mar 2021 17:26:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8F45564F2E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=csgroup.eu Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4DqkZ31HnWz3dDy for ; Wed, 3 Mar 2021 04:26:19 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=csgroup.eu (client-ip=93.17.236.30; helo=pegase1.c-s.fr; envelope-from=christophe.leroy@csgroup.eu; receiver=) Received: from pegase1.c-s.fr (pegase1.c-s.fr [93.17.236.30]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4DqkY010Y3z30NX for ; Wed, 3 Mar 2021 04:25:20 +1100 (AEDT) Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 4DqkXr0xnBz9v1C0; Tue, 2 Mar 2021 18:25:16 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id GmkJLeTlmTYY; Tue, 2 Mar 2021 18:25:16 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 4DqkXq6QS8z9v1Bx; Tue, 2 Mar 2021 18:25:15 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 9F8998B7B5; Tue, 2 Mar 2021 18:25:17 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id SpTJBwmTOVdC; Tue, 2 Mar 2021 18:25:17 +0100 (CET) Received: from po16121vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 633FD8B75F; Tue, 2 Mar 2021 18:25:17 +0100 (CET) Received: by localhost.localdomain (Postfix, from userid 0) id 32BC5674A2; Tue, 2 Mar 2021 17:25:17 +0000 (UTC) Message-Id: In-Reply-To: References: From: Christophe Leroy Subject: [PATCH v2 1/7] cmdline: Add generic function to build command line. To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , danielwa@cisco.com, robh@kernel.org, daniel@gimpelevich.san-francisco.ca.us Date: Tue, 2 Mar 2021 17:25:17 +0000 (UTC) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, devicetree@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" This code provides architectures with a way to build command line based on what is built in the kernel and what is handed over by the bootloader, based on selected compile-time options. Signed-off-by: Christophe Leroy --- include/linux/cmdline.h | 62 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 include/linux/cmdline.h diff --git a/include/linux/cmdline.h b/include/linux/cmdline.h new file mode 100644 index 000000000000..ae3610bb0ee2 --- /dev/null +++ b/include/linux/cmdline.h @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_CMDLINE_H +#define _LINUX_CMDLINE_H + +static __always_inline size_t cmdline_strlen(const char *s) +{ + const char *sc; + + for (sc = s; *sc != '\0'; ++sc) + ; /* nothing */ + return sc - s; +} + +static __always_inline size_t cmdline_strlcat(char *dest, const char *src, size_t count) +{ + size_t dsize = cmdline_strlen(dest); + size_t len = cmdline_strlen(src); + size_t res = dsize + len; + + /* This would be a bug */ + if (dsize >= count) + return count; + + dest += dsize; + count -= dsize; + if (len >= count) + len = count - 1; + memcpy(dest, src, len); + dest[len] = 0; + return res; +} + +/* + * This function will append a builtin command line to the command + * line provided by the bootloader. Kconfig options can be used to alter + * the behavior of this builtin command line. + * @dest: The destination of the final appended/prepended string. + * @src: The starting string or NULL if there isn't one. Must not equal dest. + * @length: the length of dest buffer. + */ +static __always_inline void cmdline_build(char *dest, const char *src, size_t length) +{ + if (length <= 0) + return; + + dest[0] = 0; + +#ifdef CONFIG_CMDLINE + if (IS_ENABLED(CONFIG_CMDLINE_FORCE) || !src || !src[0]) { + cmdline_strlcat(dest, CONFIG_CMDLINE, length); + return; + } +#endif + if (dest != src) + cmdline_strlcat(dest, src, length); +#ifdef CONFIG_CMDLINE + if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && sizeof(CONFIG_CMDLINE) > 1) + cmdline_strlcat(dest, " " CONFIG_CMDLINE, length); +#endif +} + +#endif /* _LINUX_CMDLINE_H */ -- 2.25.0