Fix various issues in how %#T is handled:

- If precision is 0, don't print period followed by no digits.
- If precision is 0 stop printing units as soon as possible
  (eg. if we have three years and five days and precision is 0
   print only 3y5d).
- If precision is not 0, print all units (eg. 3y0d0h0m0s.00).

MFC after:	2 weeks

1 files changed, 11 insertions, 7 deletions

diff --git a/lib/libc/stdio/xprintf_time.c b/lib/libc/stdio/xprintf_time.c
index 9d732fe..c80681e 100644
--- a/lib/libc/stdio/xprintf_time.c
+++ b/lib/libc/stdio/xprintf_time.c
@@ -80,6 +80,12 @@ __printf_render_time(struct __printf_io *io, const struct printf_info *pi, const
 		nsec = 0;
 		prec = 0;
 	}
+	if (pi->is_long || pi->is_long_double) {
+		if (pi->prec >= 0) 
+			prec = pi->prec;
+		if (prec == 0)
+			nsec = 0;
+	}
 
 	p = buf;
 	if (pi->alt) {
@@ -88,26 +94,24 @@ __printf_render_time(struct __printf_io *io, const struct printf_info *pi, const
 			p += sprintf(p, "%jdy", t / YEAR);
 			t %= YEAR;
 		}
-		if (t >= DAY && t != 0) {
+		if (tx >= DAY && (t != 0 || prec != 0)) {
 			p += sprintf(p, "%jdd", t / DAY);
 			t %= DAY;
 		}
-		if (t >= HOUR && t != 0) {
+		if (tx >= HOUR && (t != 0 || prec != 0)) {
 			p += sprintf(p, "%jdh", t / HOUR);
 			t %= HOUR;
 		}
-		if (t >= MINUTE && t != 0) {
+		if (tx >= MINUTE && (t != 0 || prec != 0)) {
 			p += sprintf(p, "%jdm", t / MINUTE);
 			t %= MINUTE;
 		}
-		if (t != 0 || tx == 0)
+		if (t != 0 || tx == 0 || prec != 0)
 			p += sprintf(p, "%jds", t);
 	} else  {
 		p += sprintf(p, "%jd", (intmax_t)t);
 	}
-	if (pi->is_long || pi->is_long_double) {
-		if (pi->prec >= 0) 
-			prec = pi->prec;
+	if (prec != 0) {
 		for (i = prec; i < 9; i++)
 			nsec /= 10;
 		p += sprintf(p, ".%.*d", prec, nsec);