GNU bug report logs - #8254
race condition in dired.c's scmp function

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Message #26 received at 8254 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Juanma Barranquero <lekktu <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 8254 <at> debbugs.gnu.org
Subject: Re: bug#8254: race condition in dired.c's scmp function
Date: Tue, 15 Mar 2011 09:58:38 -0700

On 03/15/2011 04:36 AM, Juanma Barranquero wrote:
 
> On the other hand, DOWNCASE begat UPPERCASEP, who begat LOWERCASEP and
> UPCASE (and also ISUPPER in regex.c). Not to mention UPCASE1, which
> uses the same variables and begat UPCASE (with LOWERCASEP) and
> NOCASEP... Though most of these cases use ?: and&&  and not ==, it is
> certainly tedious to check every instance of these macros.

I agree; and not only is it tedious, it's error-prone.  It's better
to fix the macros so that there's no need to check, as follows.  While
we're at it, we should simply get rid of the macros, by replacing
every use of UPPERCASEP with uppercasep, etc.

=== modified file 'src/buffer.h'
--- src/buffer.h	2011-03-15 07:04:00 +0000
+++ src/buffer.h	2011-03-15 07:28:00 +0000
@@ -1047,19 +1047,12 @@
 
 /* 1 if CH is upper case.  */
 
-#define UPPERCASEP(CH) (DOWNCASE (CH) != (CH))
-
-/* 1 if CH is neither upper nor lower case.  */
-
-#define NOCASEP(CH) (UPCASE1 (CH) == (CH))
-
-/* 1 if CH is lower case.  */
-
-#define LOWERCASEP(CH) (!UPPERCASEP (CH) && !NOCASEP(CH))
-
-/* Upcase a character, or make no change if that cannot be done.  */
-
-#define UPCASE(CH) (!UPPERCASEP (CH) ? UPCASE1 (CH) : (CH))
+static inline int
+uppercasep (int ch)
+{
+  return downcase (ch) != ch;
+}
+#define UPPERCASEP(CH) uppercasep (CH)
 
 /* Upcase a character known to be not upper case.  */
 
@@ -1070,3 +1063,30 @@
   return NATNUMP (up) ? XFASTINT (up) : ch;
 }
 #define UPCASE1(CH) upcase1 (CH)
+
+/* 1 if CH is neither upper nor lower case.  */
+
+static inline int
+nocasep (int ch)
+{
+  return upcase1 (ch) == ch;
+}
+#define NOCASEP(CH) nocasep (CH)
+
+/* 1 if CH is lower case.  */
+
+static inline int
+lowercasep (int ch)
+{
+  return !uppercasep (ch) && !nocasep (ch);
+}
+#define LOWERCASEP(CH) lowercasep (CH)
+
+/* Upcase a character, or make no change if that cannot be done.  */
+
+static inline EMACS_INT
+upcase (int ch)
+{
+  return uppercasep (ch) ? ch : upcase1 (ch);
+}
+#define UPCASE(CH) upcase (CH)

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