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=-16.8 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,USER_AGENT_GIT 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 E660EC433E0 for ; Mon, 11 Jan 2021 16:42:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B254A216C4 for ; Mon, 11 Jan 2021 16:42:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389021AbhAKQmh (ORCPT ); Mon, 11 Jan 2021 11:42:37 -0500 Received: from mail.thundersoft.com ([114.242.213.61]:36453 "EHLO mail2.thundersoft.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1728302AbhAKQmg (ORCPT ); Mon, 11 Jan 2021 11:42:36 -0500 X-Greylist: delayed 450 seconds by postgrey-1.27 at vger.kernel.org; Mon, 11 Jan 2021 11:42:34 EST Received: from localhost.localdomain (unknown [192.168.8.82]) by mail2.thundersoft.com (Postfix) with ESMTPSA id 7659AE608B9; Tue, 12 Jan 2021 00:34:47 +0800 (CST) From: Wesley Zhao To: akpm@linux-foundation.org Cc: andriy.shevchenko@linux.intel.com, keescook@chromium.org, tglx@linutronix.de, kerneldev@karsmulder.nl, nivedita@alum.mit.edu, joe@perches.com, gpiccoli@canonical.com, aquini@redhat.com, gustavoars@kernel.org, zhaowei1102@thundersoft.com, ojeda@kernel.org, ndesaulniers@gooogle.com, linux-kernel@vger.kernel.org, david@redhat.com, dan.j.williams@intel.com, guohanjun@huawei.com, mchehab+huawei@kernel.org Subject: [PATCH 1/2] lib/cmdline: add new function get_option_ull() Date: Mon, 11 Jan 2021 08:33:17 -0800 Message-Id: <1610382798-4528-1-git-send-email-zhaowei1102@thundersoft.com> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Wesley.Zhao" In the future we would pass the unsigned long long parameter like(0x123456781234) in cmdline on the 64bit platform, so add a new option parse function get_option_ull() Signed-off-by: Wesley.Zhao --- include/linux/kernel.h | 1 + lib/cmdline.c | 35 +++++++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index f7902d8..5568133 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -348,6 +348,7 @@ extern __scanf(2, 0) int vsscanf(const char *, const char *, va_list); extern int get_option(char **str, int *pint); +extern int get_option_ull(char **str, unsigned long long *pull); extern char *get_options(const char *str, int nints, int *ints); extern unsigned long long memparse(const char *ptr, char **retptr); extern bool parse_option_str(const char *str, const char *option); diff --git a/lib/cmdline.c b/lib/cmdline.c index b390dd0..2d089a2 100644 --- a/lib/cmdline.c +++ b/lib/cmdline.c @@ -80,6 +80,41 @@ int get_option(char **str, int *pint) EXPORT_SYMBOL(get_option); /** + * get_option_ull - Parse unsigned long long from an option string + * @str: option string + * @pull: (output) unsigned long long value parsed from @str + * + * Read an unsigned long long from an option string; if available accept a subsequent + * comma as well. + * + * Return values: + * 0 - no ull in string + * 1 - ull found, no subsequent comma + * 2 - ull found including a subsequent comma + * 3 - hyphen found to denote a range + */ + +int get_option_ull(char **str, unsigned long long *pull) +{ + char *cur = *str; + + if (!cur || !(*cur)) + return 0; + *pull = simple_strtoull(cur, str, 0); + if (cur == *str) + return 0; + if (**str == ',') { + (*str)++; + return 2; + } + if (**str == '-') + return 3; + + return 1; +} +EXPORT_SYMBOL(get_option_ull); + +/** * get_options - Parse a string into a list of integers * @str: String to be parsed * @nints: size of integer array -- 2.7.4