Handle the printf %F format modifier.

dlls/msvcrt/tests/printf.c

@@ -71,6 +71,11 @@ static void test_sprintf( void )
     ok(!strcmp(buffer,"  0X00000039"),"Pointer formatted incorrectly\n");
     ok( r==12, "return count wrong\n");
 
+    format = "%Fp";
+    r = sprintf(buffer,format,(void *)57);
+    ok(!strcmp(buffer,"00000039"),"Pointer formatted incorrectly \"%s\"\n",buffer);
+    ok( r==8, "return count wrong\n");
+
     format = "%04s";
     r = sprintf(buffer,format,"foo");
     ok(!strcmp(buffer,"0foo"),"String not zero-prefixed \"%s\"\n",buffer);
@@ -240,6 +245,16 @@ static void test_sprintf( void )
     ok(!strcmp(buffer,"j"), "failed\n");
     ok( r==1, "return count wrong\n");
 
+    format = "%F";
+    r = sprintf(buffer, format,-1);
+    ok(!strcmp(buffer,""), "failed\n");
+    ok( r==0, "return count wrong\n");
+
+    format = "%H";
+    r = sprintf(buffer, format,-1);
+    ok(!strcmp(buffer,"H"), "failed\n");
+    ok( r==1, "return count wrong\n");
+
     format = "x%cx";
     r = sprintf(buffer, format, 0x100+'X');
     ok(!strcmp(buffer,"xXx"), "failed\n");

dlls/msvcrt/wcs.c

@@ -491,6 +491,8 @@ static int pf_vsnprintf( pf_output *out, const WCHAR *format, va_list valist )
             }
             else if( *p == 'w' )
                 flags.WideString = *p++;
+            else if( *p == 'F' )
+                p++; /* ignore */
             else
                 break;
         }