[PATCH v1 1/4] lib/vsprintf: Allow to override date and time separator

[Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>]

ISO 8601 defines 'T' as a separator between date and time. Though,
some ABIs use time and date with ' ' separator instead.

Add a flavour to the %pt specifier to override default separator.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
 Documentation/core-api/printk-formats.rst |  6 +++++-
 lib/test_printf.c                         |  5 +++++
 lib/vsprintf.c                            | 19 ++++++++++++++++---
 3 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
index f063a384c7c8..bc85fd4685e7 100644
--- a/Documentation/core-api/printk-formats.rst
+++ b/Documentation/core-api/printk-formats.rst
@@ -514,9 +514,10 @@ Time and date
 ::
 
 	%pt[RT]			YYYY-mm-ddTHH:MM:SS
+	%pt[RT]s		YYYY-mm-dd HH:MM:SS
 	%pt[RT]d		YYYY-mm-dd
 	%pt[RT]t		HH:MM:SS
-	%pt[RT][dt][r]
+	%pt[RT][dt][rs]
 
 For printing date and time as represented by::
 
@@ -528,6 +529,9 @@ in human readable format.
 By default year will be incremented by 1900 and month by 1.
 Use %pt[RT]r (raw) to suppress this behaviour.
 
+The %pt[RT]s (space) will override ISO 8601 by using ' ' instead of 'T'
+between date and time. It won't have any effect when date or time is omitted.
+
 Passed by reference.
 
 struct clk
diff --git a/lib/test_printf.c b/lib/test_printf.c
index ec0d5976bb69..8ac71aee46af 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -528,6 +528,11 @@ time_and_date(void)
 	test("0119-00-04T15:32:23", "%ptTr", &t);
 	test("15:32:23|2019-01-04", "%ptTt|%ptTd", &t, &t);
 	test("15:32:23|0119-00-04", "%ptTtr|%ptTdr", &t, &t);
+
+	test("2019-01-04 15:32:23", "%ptTs", &t);
+	test("0119-00-04 15:32:23", "%ptTsr", &t);
+	test("15:32:23|2019-01-04", "%ptTts|%ptTds", &t, &t);
+	test("15:32:23|0119-00-04", "%ptTtrs|%ptTdrs", &t, &t);
 }
 
 static void __init
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index f0c35d9b65bf..5f36c7a43cdc 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1834,7 +1834,8 @@ char *rtc_str(char *buf, char *end, const struct rtc_time *tm,
 	      struct printf_spec spec, const char *fmt)
 {
 	bool have_t = true, have_d = true;
-	bool raw = false;
+	bool raw = false, space = false;
+	bool found = true;
 	int count = 2;
 
 	if (check_pointer(&buf, end, tm, spec))
@@ -1851,14 +1852,26 @@ char *rtc_str(char *buf, char *end, const struct rtc_time *tm,
 		break;
 	}
 
-	raw = fmt[count] == 'r';
+	do {
+		switch (fmt[count++]) {
+		case 'r':
+			raw = true;
+			break;
+		case 's':
+			space = true;
+			break;
+		default:
+			found = false;
+			break;
+		}
+	} while (found);
 
 	if (have_d)
 		buf = date_str(buf, end, tm, raw);
 	if (have_d && have_t) {
 		/* Respect ISO 8601 */
 		if (buf < end)
-			*buf = 'T';
+			*buf = space ? ' ' : 'T';
 		buf++;
 	}
 	if (have_t)
-- 
2.30.2