From 9149a519f5f1bbe0ad821fb1a6a408663fd3741d Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Tue, 18 Jun 2019 14:47:52 +0200
Subject: [PATCH] printf: Support printing negative values with %f or %g.

---
 AK/PrintfImplementation.h | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/AK/PrintfImplementation.h b/AK/PrintfImplementation.h
index a115f78c19..091b5b4334 100644
--- a/AK/PrintfImplementation.h
+++ b/AK/PrintfImplementation.h
@@ -106,6 +106,16 @@ template<typename PutChFunc>
     return fieldWidth;
 }
 
+template<typename PutChFunc>
+[[gnu::always_inline]] inline int print_signed_qword(PutChFunc putch, char*& bufptr, signed_qword number, bool leftPad, bool zeroPad, dword fieldWidth)
+{
+    if (number < 0) {
+        putch(bufptr, '-');
+        return print_qword(putch, bufptr, 0 - number, leftPad, zeroPad, fieldWidth) + 1;
+    }
+    return print_qword(putch, bufptr, number, leftPad, zeroPad, fieldWidth);
+}
+
 template<typename PutChFunc>
 [[gnu::always_inline]] inline int print_octal_number(PutChFunc putch, char*& bufptr, dword number, bool leftPad, bool zeroPad, dword fieldWidth)
 {
@@ -246,7 +256,7 @@ template<typename PutChFunc>
             case 'g':
             case 'f':
                 // FIXME: Print as float!
-                ret += print_number(putch, bufptr, (int)va_arg(ap, double), leftPad, zeroPad, fieldWidth);
+                ret += print_signed_qword(putch, bufptr, (qword)va_arg(ap, double), leftPad, zeroPad, fieldWidth);
                 break;
 #endif