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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2018-12-05 00:23:11 +0300
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2018-12-11 00:39:34 +0300
commit4d42c44727a062e233e446c6c86da1c84d762d79 (patch)
treeb4992b55032b1f92172d8a09b9d515531e0933fb /lib/vsprintf.c
parent8c4cf161a8b42749e986a3503f6cd4f3b5682fe3 (diff)
downloadlinux-4d42c44727a062e233e446c6c86da1c84d762d79.tar.xz
lib/vsprintf: Print time and date in human readable format via %pt
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. Cc: Arnd Bergmann <arnd@arndb.de> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Jonathan Hunter <jonathanh@nvidia.com> Cc: Krzysztof Kozlowski <krzk@kernel.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Petr Mladek <pmladek@suse.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'lib/vsprintf.c')
-rw-r--r--lib/vsprintf.c100
1 files changed, 100 insertions, 0 deletions
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)
@@ -1550,6 +1565,87 @@ char *address_val(char *buf, char *end, const void *addr, const char *fmt)
}
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':