GNU bug report logs - #7203
[PATCH] sort: fix unportable conversion of unsigned char * -> char *

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Bug-coreutils <bug-coreutils <at> gnu.org>
Subject: [PATCH] sort: fix unportable conversion of unsigned char * -> char *
Date: Tue, 12 Oct 2010 13:00:03 -0700

This is another portability bug caught by the Sun C compiler.
Without this patch, cc complains:

"sort.c", line 3933: warning: assignment type mismatch:
        pointer to const char "=" pointer to unsigned char


* src/sort.c (fold_toupper): Change this back from char to
unsigned char, fixing a regression introduced in commit
59e2e55d0f154a388adc9bac37d2b45f2ba971f8 dated February 26, as the
C Standard doesn't let you convert from unsigned char * to char *
without a cast, and the (in theory more portable) style here is to
convert char values, not pointer values.
(getmonth): Convert char to unsigned char when needed for
comparison.
---
 src/sort.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/sort.c b/src/sort.c
index 89f7be3..c155eda 100644
--- a/src/sort.c
+++ b/src/sort.c
@@ -268,7 +268,7 @@ static bool nonprinting[UCHAR_LIM];
 static bool nondictionary[UCHAR_LIM];
 
 /* Translation table folding lower case to upper.  */
-static unsigned char fold_toupper[UCHAR_LIM];
+static char fold_toupper[UCHAR_LIM];
 
 #define MONTHS_PER_YEAR 12
 
@@ -1952,12 +1952,12 @@ getmonth (char const *month, char **ea)
                 *ea = (char *) m;
               return monthtab[ix].val;
             }
-          if (fold_toupper[to_uchar (*m)] < to_uchar (*n))
+          if (to_uchar (fold_toupper[to_uchar (*m)]) < to_uchar (*n))
             {
               hi = ix;
               break;
             }
-          else if (fold_toupper[to_uchar (*m)] > to_uchar (*n))
+          else if (to_uchar (fold_toupper[to_uchar (*m)]) > to_uchar (*n))
             {
               lo = ix + 1;
               break;
-- 
1.7.2

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