From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752119AbdFHNs5 (ORCPT ); Thu, 8 Jun 2017 09:48:57 -0400 Received: from mga05.intel.com ([192.55.52.43]:24357 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751656AbdFHNsx (ORCPT ); Thu, 8 Jun 2017 09:48:53 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.39,315,1493708400"; d="scan'208";a="1158112707" From: Andy Shevchenko To: Rasmus Villemoes , Greg Kroah-Hartman , Andrew Morton , linux-kernel@vger.kernel.org, Alessandro Zummo , Alexandre Belloni , linux-rtc@vger.kernel.org Cc: Andy Shevchenko , Arnd Bergmann , Bartlomiej Zolnierkiewicz , Dmitry Torokhov , Geert Uytterhoeven , Guan Xuetao , Ingo Molnar , Jason Wessel , Jonathan Corbet , Jonathan Hunter , Krzysztof Kozlowski , "Rafael J. Wysocki" , Thierry Reding Subject: [PATCH v1 04/25] lib/vsprintf: Print time and date in human readable format via %pt Date: Thu, 8 Jun 2017 16:47:50 +0300 Message-Id: <20170608134811.60786-5-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170608134811.60786-1-andriy.shevchenko@linux.intel.com> References: <20170608134811.60786-1-andriy.shevchenko@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There are users which print time and date represented by content of struct rtc_time in human readable format. Instead of open coding that each time introduce %pt[dt][rv] specifier. Cc: Arnd Bergmann Cc: Bartlomiej Zolnierkiewicz Cc: Dmitry Torokhov Cc: Geert Uytterhoeven Cc: Guan Xuetao Cc: Ingo Molnar Cc: Jason Wessel Cc: Jonathan Corbet Cc: Jonathan Hunter Cc: Krzysztof Kozlowski Cc: "Rafael J. Wysocki" Cc: Thierry Reding Signed-off-by: Andy Shevchenko --- Documentation/printk-formats.txt | 17 ++++++ lib/vsprintf.c | 124 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 141 insertions(+) diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt index d8c40c30118a..fa5b718a5dcc 100644 --- a/Documentation/printk-formats.txt +++ b/Documentation/printk-formats.txt @@ -282,6 +282,23 @@ struct va_format: Passed by reference. +struct rtc_time: + + %pt YYYY-mm-dd HH:MM:SS + %ptd YYYY-mm-dd + %ptt HH:MM:SS + %pt[dt][rv] + + For printing date and time as represented by struct rtc_time + structure in human readable format. + + By default year will be incremented by 1900 and month by 1. Use + 'r' (raw) to suppress this behaviour. On the other hand when + 'v' is applied validation mechanism will be in use, i.e. numbers + out of range will be replaced by '**' or '****'. + + Passed by reference. + struct clk: %pC pll1 diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 001303612b55..653d08b50850 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #include #ifdef CONFIG_BLOCK @@ -701,6 +702,20 @@ static const struct printf_spec default_dec_spec = { .precision = -1, }; +static const struct printf_spec default_dec02_spec = { + .base = 10, + .field_width = 2, + .precision = -1, + .flags = ZEROPAD, +}; + +static const struct printf_spec default_dec04_spec = { + .base = 10, + .field_width = 4, + .precision = -1, + .flags = ZEROPAD, +}; + static noinline_for_stack char *resource_string(char *buf, char *end, struct resource *res, struct printf_spec spec, const char *fmt) @@ -1382,6 +1397,112 @@ char *address_val(char *buf, char *end, const void *addr, const char *fmt) } static noinline_for_stack +char *date_string(char *buf, char *end, const struct rtc_time *tm, bool v, bool r) +{ + int year = tm->tm_year + (r ? 0 : 1900); + int mon = tm->tm_mon + (r ? 0 : 1); + + if (unlikely(v && (unsigned int)tm->tm_year > 200)) + buf = string(buf, end, "****", default_str_spec); + else + buf = number(buf, end, year, default_dec04_spec); + + if (buf < end) + *buf = '-'; + buf++; + + if (unlikely(v && (unsigned int)tm->tm_mon > 11)) + buf = string(buf, end, "**", default_str_spec); + else + buf = number(buf, end, mon, default_dec02_spec); + + if (buf < end) + *buf = '-'; + buf++; + + if (unlikely(v && (unsigned int)tm->tm_mday > 31)) + buf = string(buf, end, "**", default_str_spec); + else + buf = number(buf, end, tm->tm_mday, default_dec02_spec); + + return buf; +} + +static noinline_for_stack +char *time_string(char *buf, char *end, const struct rtc_time *tm, bool v, bool r) +{ + if (unlikely(v && (unsigned int)tm->tm_hour > 24)) + buf = string(buf, end, "**", default_str_spec); + else + buf = number(buf, end, tm->tm_hour, default_dec02_spec); + + if (buf < end) + *buf = ':'; + buf++; + + if (unlikely(v && (unsigned int)tm->tm_min > 59)) + buf = string(buf, end, "**", default_str_spec); + else + buf = number(buf, end, tm->tm_min, default_dec02_spec); + + if (buf < end) + *buf = ':'; + buf++; + + if (unlikely(v && (unsigned int)tm->tm_sec > 59)) + buf = string(buf, end, "**", default_str_spec); + else + buf = number(buf, end, tm->tm_sec, default_dec02_spec); + + return buf; +} + +static noinline_for_stack +char *timeanddate(char *buf, char *end, const struct rtc_time *tm, const char *fmt) +{ + bool have_t = true, have_d = true; + bool validate = false; + bool raw = false; + int count = 0; + bool found; + + switch (fmt[++count]) { + case 'd': + have_t = false; + break; + case 't': + have_d = false; + break; + } + + /* No %pt[dt] supplied */ + if (have_t && have_d) + --count; + + found = true; + do { + switch (fmt[++count]) { + case 'r': + raw = true; + break; + case 'v': + validate = true; + break; + default: + found = false; + break; + } + } while (found); + + if (have_d) + buf = date_string(buf, end, tm, validate, raw); + if (have_t) + buf = time_string(buf, end, tm, validate, raw); + + return buf; +} + +static noinline_for_stack char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, const char *fmt) { @@ -1550,6 +1671,7 @@ int kptr_restrict __read_mostly; * - 'd[234]' For a dentry name (optionally 2-4 last components) * - 'D[234]' Same as 'd' but for a struct file * - 'g' For block_device name (gendisk + partition number) + * - 't[dt][rv]' For time and date as represented in struct rtc_time * - 'C' For a clock, it prints the name (Common Clock Framework) or address * (legacy clock framework) of the clock * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address @@ -1702,6 +1824,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr, return address_val(buf, end, ptr, fmt); case 'd': return dentry_name(buf, end, ptr, spec, fmt); + case 't': + return timeanddate(buf, end, (const struct rtc_time *)ptr, fmt); case 'C': return clock(buf, end, ptr, spec, fmt); case 'D': -- 2.11.0