lib9: restore printing of signed integers

A casualty of https://golang.org/cl/10195044.

If x is an 32-bit int and u is a 64-bit ulong,
        u = (uint)x // converts to uint before extension, so zero fills
        u = (ulong)x // sign-extends

TBR=iant, r
CC=golang-dev
https://golang.org/cl/10814043

diff --git a/src/lib9/fmt/dofmt.c b/src/lib9/fmt/dofmt.c
index 95f378704a4060217bbab24c8450db59eaf3a955..94a91a2aac2e0aff09838616349cff7bd8d715e2 100644 (file)
--- a/src/lib9/fmt/dofmt.c
+++ b/src/lib9/fmt/dofmt.c
@@ -387,17 +387,17 @@ __ifmt(Fmt *f)
                if(fl & FmtUnsigned)
                        u = (uchar)va_arg(f->args, int);
                else
-                       u = (uchar)(char)va_arg(f->args, int);
+                       u = (ulong)(char)va_arg(f->args, int);
        }else if(fl & FmtShort){
                if(fl & FmtUnsigned)
                        u = (ushort)va_arg(f->args, int);
                else
-                       u = (ushort)(short)va_arg(f->args, int);
+                       u = (ulong)(short)va_arg(f->args, int);
        }else{
                if(fl & FmtUnsigned)
                        u = va_arg(f->args, uint);
                else
-                       u = (uint)va_arg(f->args, int);
+                       u = (ulong)va_arg(f->args, int);
        }
        conv = "0123456789abcdef";
        grouping = "\4";        /* for hex, octal etc. (undefined by spec but nice) */