libstdio: sync bits of vfprintf from APE

* Add the %ll length modifier,
* Convert nil to "<nil>" under %s (not in APE),
* Cast void* to uintptr under %p,
* Use "0x" hex prefix under %p,
* Fix manual page mentions of %P to %p,
* Fix empty result for fp conversions,
* Fix zero padding of left-aligned fp conversions,
* Remove deprecated #pragma ref uses.

Most of these were introduced in APE prior to 9front.

I've omitted the %z conversion specifier since Plan 9 code
rarely uses the usize type. This may need to be added later
for the benefit of native ports of alien code.

1 files changed, 27 insertions, 2 deletions

diff --git a/sys/man/2/fprintf b/sys/man/2/fprintf
index b7f616c33..abd7687f4 100644
--- a/sys/man/2/fprintf
+++ b/sys/man/2/fprintf
@@ -200,6 +200,22 @@ or
 .B long
 argument;
 an optional
+.B ll
+specifying that a following
+.BR d ,
+.BR i ,
+.BR o ,
+.BR u ,
+.BR x ,
+or
+.B X
+conversion character applies to a
+.B long long
+or
+.B unsigned
+.B long long
+argument;
+an optional
 .B l
 specifying that a following
 .B n
@@ -207,6 +223,14 @@ conversion specifier applies to a pointer to a
 .B long
 .B int
 argument;
+an optional
+.B ll
+specifying that a following
+.B n
+conversion specifier applies to a pointer to a
+.B long long
+.B int
+argument;
 or an optional
 .B L
 specifying that a following
@@ -222,6 +246,7 @@ argument.
 If an
 .BR h ,
 .BR l ,
+.BR ll ,
 or
 .B L
 appears with any other conversion specifier, the behavior is undefined.
@@ -459,7 +484,7 @@ zero
 value for
 the argument yields undefined results.
 .TP
-.B P
+.B p
 The
 .B void*
 argument is printed in an implementation-defined way (for Plan 9:
@@ -487,7 +512,7 @@ If any argument is, or points to, a union or an aggregate
 conversion, or a pointer cast to be a pointer to
 .B void
 using
-.B %P
+.B %p
 conversion), the behavior is undefined.
 .PP
 In no case does a nonexistent or small field width cause truncation