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Date: Mon, 10 Dec 2018 11:09:08 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Alessandro Zummo <a.zummo@...ertech.it>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
linux-rtc@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
Joe Perches <joe@...ches.com>,
Mark Salyzyn <salyzyn@...roid.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
linux-kernel@...r.kernel.org,
Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Guan Xuetao <gxt@...c.pku.edu.cn>,
Ingo Molnar <mingo@...nel.org>,
Jason Wessel <jason.wessel@...driver.com>,
Jonathan Corbet <corbet@....net>,
Jonathan Hunter <jonathanh@...dia.com>,
Krzysztof Kozlowski <krzk@...nel.org>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Thierry Reding <thierry.reding@...il.com>,
Petr Mladek <pmladek@...e.com>
Subject: Re: [PATCH v6 01/20] lib/vsprintf: Print time and date in human
readable format via %pt
On Tue, Dec 04, 2018 at 11:23:11PM +0200, Andy Shevchenko wrote:
> 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 %ptR[dt][r] specifier.
>
Petr, is it now looks good to you? Can you give a tag?
Alexandre, it looks like Petr's Ack is missed and we would be fine to
eventually proceed with it if you have no more comments. What do you think?
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Guan Xuetao <gxt@...c.pku.edu.cn>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Jason Wessel <jason.wessel@...driver.com>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Jonathan Hunter <jonathanh@...dia.com>
> Cc: Krzysztof Kozlowski <krzk@...nel.org>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Thierry Reding <thierry.reding@...il.com>
> Cc: Petr Mladek <pmladek@...e.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> Documentation/core-api/printk-formats.rst | 18 ++++
> lib/test_printf.c | 61 ++++++++++++-
> lib/vsprintf.c | 100 ++++++++++++++++++++++
> 3 files changed, 176 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
> index ff48b55040ef..a7fae4538946 100644
> --- a/Documentation/core-api/printk-formats.rst
> +++ b/Documentation/core-api/printk-formats.rst
> @@ -412,6 +412,24 @@ Examples::
>
> Passed by reference.
>
> +Time and date (struct rtc_time)
> +-------------------------------
> +
> +::
> +
> + %ptR YYYY-mm-ddTHH:MM:SS
> + %ptRd YYYY-mm-dd
> + %ptRt HH:MM:SS
> + %ptR[dt][r]
> +
> +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 %ptRr (raw)
> +to suppress this behaviour.
> +
> +Passed by reference.
> +
> struct clk
> ----------
>
> diff --git a/lib/test_printf.c b/lib/test_printf.c
> index 53527ea822b5..659b6cc0d483 100644
> --- a/lib/test_printf.c
> +++ b/lib/test_printf.c
> @@ -9,6 +9,7 @@
> #include <linux/module.h>
> #include <linux/printk.h>
> #include <linux/random.h>
> +#include <linux/rtc.h>
> #include <linux/slab.h>
> #include <linux/string.h>
>
> @@ -249,12 +250,11 @@ plain_format(void)
> #endif /* BITS_PER_LONG == 64 */
>
> static int __init
> -plain_hash(void)
> +plain_hash_to_buffer(const void *p, char *buf, size_t len)
> {
> - char buf[PLAIN_BUF_SIZE];
> int nchars;
>
> - nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);
> + nchars = snprintf(buf, len, "%p", p);
>
> if (nchars != PTR_WIDTH)
> return -1;
> @@ -265,6 +265,20 @@ plain_hash(void)
> return 0;
> }
>
> + return 0;
> +}
> +
> +
> +static int __init
> +plain_hash(void)
> +{
> + char buf[PLAIN_BUF_SIZE];
> + int ret;
> +
> + ret = plain_hash_to_buffer(PTR, buf, PLAIN_BUF_SIZE);
> + if (ret)
> + return ret;
> +
> if (strncmp(buf, PTR_STR, PTR_WIDTH) == 0)
> return -1;
>
> @@ -294,6 +308,23 @@ plain(void)
> }
> }
>
> +static void __init
> +test_hashed(const char *fmt, const void *p)
> +{
> + char buf[PLAIN_BUF_SIZE];
> + int ret;
> +
> + /*
> + * No need to increase failed test counter since this is assumed
> + * to be called after plain().
> + */
> + ret = plain_hash_to_buffer(p, buf, PLAIN_BUF_SIZE);
> + if (ret)
> + return;
> +
> + test(buf, fmt, p);
> +}
> +
> static void __init
> symbol_ptr(void)
> {
> @@ -418,6 +449,29 @@ struct_va_format(void)
> {
> }
>
> +static void __init
> +struct_rtc_time(void)
> +{
> + /* 1543210543 */
> + const struct rtc_time tm = {
> + .tm_sec = 43,
> + .tm_min = 35,
> + .tm_hour = 5,
> + .tm_mday = 26,
> + .tm_mon = 10,
> + .tm_year = 118,
> + };
> +
> + test_hashed("%pt", &tm);
> +
> + test("2018-11-26T05:35:43", "%ptR", &tm);
> + test("0118-10-26T05:35:43", "%ptRr", &tm);
> + test("05:35:43|2018-11-26", "%ptRt|%ptRd", &tm, &tm);
> + test("05:35:43|0118-10-26", "%ptRtr|%ptRdr", &tm, &tm);
> + test("05:35:43|2018-11-26", "%ptRttr|%ptRdtr", &tm, &tm);
> + test("05:35:43 tr|2018-11-26 tr", "%ptRt tr|%ptRd tr", &tm, &tm);
> +}
> +
> static void __init
> struct_clk(void)
> {
> @@ -529,6 +583,7 @@ test_pointer(void)
> uuid();
> dentry();
> struct_va_format();
> + struct_rtc_time();
> struct_clk();
> bitmap();
> netdev_features();
> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> index 37a54a6dd594..3add92329bae 100644
> --- a/lib/vsprintf.c
> +++ b/lib/vsprintf.c
> @@ -30,6 +30,7 @@
> #include <linux/ioport.h>
> #include <linux/dcache.h>
> #include <linux/cred.h>
> +#include <linux/rtc.h>
> #include <linux/uuid.h>
> #include <linux/of.h>
> #include <net/addrconf.h>
> @@ -822,6 +823,20 @@ 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)
> @@ -1549,6 +1564,87 @@ char *address_val(char *buf, char *end, const void *addr, const char *fmt)
> return special_hex_number(buf, end, num, size);
> }
>
> +static noinline_for_stack
> +char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r)
> +{
> + int year = tm->tm_year + (r ? 0 : 1900);
> + int mon = tm->tm_mon + (r ? 0 : 1);
> +
> + buf = number(buf, end, year, default_dec04_spec);
> + if (buf < end)
> + *buf = '-';
> + buf++;
> +
> + buf = number(buf, end, mon, default_dec02_spec);
> + if (buf < end)
> + *buf = '-';
> + buf++;
> +
> + return number(buf, end, tm->tm_mday, default_dec02_spec);
> +}
> +
> +static noinline_for_stack
> +char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r)
> +{
> + buf = number(buf, end, tm->tm_hour, default_dec02_spec);
> + if (buf < end)
> + *buf = ':';
> + buf++;
> +
> + buf = number(buf, end, tm->tm_min, default_dec02_spec);
> + if (buf < end)
> + *buf = ':';
> + buf++;
> +
> + return number(buf, end, tm->tm_sec, default_dec02_spec);
> +}
> +
> +static noinline_for_stack
> +char *rtc_str(char *buf, char *end, const struct rtc_time *tm, const char *fmt)
> +{
> + bool have_t = true, have_d = true;
> + bool raw = false;
> + int count = 2;
> +
> + switch (fmt[count]) {
> + case 'd':
> + have_t = false;
> + count++;
> + break;
> + case 't':
> + have_d = false;
> + count++;
> + break;
> + }
> +
> + raw = fmt[count] == 'r';
> +
> + if (have_d)
> + buf = date_str(buf, end, tm, raw);
> + if (have_d && have_t) {
> + /* Respect ISO 8601 */
> + if (buf < end)
> + *buf = 'T';
> + buf++;
> + }
> + if (have_t)
> + buf = time_str(buf, end, tm, raw);
> +
> + return buf;
> +}
> +
> +static noinline_for_stack
> +char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec,
> + const char *fmt)
> +{
> + switch (fmt[1]) {
> + case 'R':
> + return rtc_str(buf, end, (const struct rtc_time *)ptr, fmt);
> + default:
> + return ptr_to_id(buf, end, ptr, spec);
> + }
> +}
> +
> static noinline_for_stack
> char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
> const char *fmt)
> @@ -1828,6 +1924,8 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
> * - '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[R][dt][r]' For time and date as represented:
> + * R 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
> @@ -1952,6 +2050,8 @@ 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 time_and_date(buf, end, ptr, spec, fmt);
> case 'C':
> return clock(buf, end, ptr, spec, fmt);
> case 'D':
> --
> 2.19.2
>
--
With Best Regards,
Andy Shevchenko
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