msvcrt: Require exact uppercase and lowercase format in printf routines.

dlls/msvcrt/tests/printf.c

@@ -51,6 +51,11 @@ static void test_sprintf( void )
     ok(!strcmp(buffer, "1"), "Problem with \"ll\" interpretation\n");
     ok( r==1, "return count wrong\n");
 
+    format = "%I";
+    r = sprintf(buffer,format,1);
+    ok(!strcmp(buffer, "I"), "Problem with \"I\" interpretation\n");
+    ok( r==1, "return count wrong\n");
+
     format = "%S";
     r = sprintf(buffer,format,wide);
     ok(!strcmp(buffer,"wide"),"Problem with wide string format\n");

dlls/msvcrt/wcs.c

@@ -347,19 +347,17 @@ static inline int pf_output_format_A( pf_output *out, LPCSTR str,
 
 static inline BOOL pf_is_double_format( char fmt )
 {
-    char float_fmts[] = "aefg";
+    static const char float_fmts[] = "aeEfgG";
     if (!fmt)
         return FALSE;
-    fmt = tolower( fmt );
     return strchr( float_fmts, fmt ) ? TRUE : FALSE;
 }
 
 static inline BOOL pf_is_valid_format( char fmt )
 {
-    char float_fmts[] = "acdefginoux";
+    static const char float_fmts[] = "acCdeEfgGinouxX";
     if (!fmt)
         return FALSE;
-    fmt = tolower( fmt );
     return strchr( float_fmts, fmt ) ? TRUE : FALSE;
 }