I  have added these macros to c.h:

        #define HIGHBIT                 (0x80)
        #define IS_HIGHBIT_SET(ch)      ((unsigned char)(ch) & HIGHBIT)

and removed CSIGNBIT and mapped it uses to HIGHBIT.  I have also added
uses for IS_HIGHBIT_SET where appropriate. This change is purely for
code clarity.  Applied patch attached.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073
Index: src/backend/access/common/heaptuple.c
===================================================================
RCS file: /cvsroot/pgsql/src/backend/access/common/heaptuple.c,v
retrieving revision 1.104
diff -c -c -u -r1.104 heaptuple.c
--- src/backend/access/common/heaptuple.c       22 Nov 2005 18:17:05 -0000      
1.104
+++ src/backend/access/common/heaptuple.c       25 Dec 2005 02:06:36 -0000
@@ -111,7 +111,7 @@
        if (bit != NULL)
        {
                bitP = &bit[-1];
-               bitmask = CSIGNBIT;
+               bitmask = HIGHBIT;
        }
        else
        {
@@ -128,7 +128,7 @@
 
                if (bit != NULL)
                {
-                       if (bitmask != CSIGNBIT)
+                       if (bitmask != HIGHBIT)
                                bitmask <<= 1;
                        else
                        {
@@ -210,7 +210,7 @@
        if (bit != NULL)
        {
                bitP = &bit[-1];
-               bitmask = CSIGNBIT;
+               bitmask = HIGHBIT;
        }
        else
        {
@@ -227,7 +227,7 @@
 
                if (bit != NULL)
                {
-                       if (bitmask != CSIGNBIT)
+                       if (bitmask != HIGHBIT)
                                bitmask <<= 1;
                        else
                        {
Index: src/backend/parser/scansup.c
===================================================================
RCS file: /cvsroot/pgsql/src/backend/parser/scansup.c,v
retrieving revision 1.30
diff -c -c -u -r1.30 scansup.c
--- src/backend/parser/scansup.c        15 Oct 2005 02:49:22 -0000      1.30
+++ src/backend/parser/scansup.c        25 Dec 2005 02:06:37 -0000
@@ -149,7 +149,7 @@
 
                if (ch >= 'A' && ch <= 'Z')
                        ch += 'a' - 'A';
-               else if (ch >= 0x80 && isupper(ch))
+               else if (IS_HIGHBIT_SET(ch) && isupper(ch))
                        ch = tolower(ch);
                result[i] = (char) ch;
        }
Index: src/backend/utils/adt/network.c
===================================================================
RCS file: /cvsroot/pgsql/src/backend/utils/adt/network.c,v
retrieving revision 1.56
diff -c -c -u -r1.56 network.c
--- src/backend/utils/adt/network.c     17 Oct 2005 16:24:19 -0000      1.56
+++ src/backend/utils/adt/network.c     25 Dec 2005 02:06:37 -0000
@@ -904,16 +904,16 @@
        rb = ((const u_char *) r)[b];
        for (b = n % 8; b > 0; b--)
        {
-               if ((lb & 0x80) != (rb & 0x80))
+               if (IS_HIGHBIT_SET(lb) != IS_HIGHBIT_SET(rb))
                {
-                       if (lb & 0x80)
-                               return (1);
-                       return (-1);
+                       if (IS_HIGHBIT_SET(lb))
+                               return 1;
+                       return -1;
                }
                lb <<= 1;
                rb <<= 1;
        }
-       return (0);
+       return 0;
 }
 
 static bool
Index: src/backend/utils/adt/varbit.c
===================================================================
RCS file: /cvsroot/pgsql/src/backend/utils/adt/varbit.c,v
retrieving revision 1.47
diff -c -c -u -r1.47 varbit.c
--- src/backend/utils/adt/varbit.c      15 Oct 2005 02:49:30 -0000      1.47
+++ src/backend/utils/adt/varbit.c      25 Dec 2005 02:06:38 -0000
@@ -120,7 +120,7 @@
        {
                /* Parse the bit representation of the string */
                /* We know it fits, as bitlen was compared to atttypmod */
-               x = BITHIGH;
+               x = HIGHBIT;
                for (; *sp; sp++)
                {
                        if (*sp == '1')
@@ -134,7 +134,7 @@
                        x >>= 1;
                        if (x == 0)
                        {
-                               x = BITHIGH;
+                               x = HIGHBIT;
                                r++;
                        }
                }
@@ -401,7 +401,7 @@
        {
                /* Parse the bit representation of the string */
                /* We know it fits, as bitlen was compared to atttypmod */
-               x = BITHIGH;
+               x = HIGHBIT;
                for (; *sp; sp++)
                {
                        if (*sp == '1')
@@ -415,7 +415,7 @@
                        x >>= 1;
                        if (x == 0)
                        {
-                               x = BITHIGH;
+                               x = HIGHBIT;
                                r++;
                        }
                }
@@ -477,14 +477,14 @@
                x = *sp;
                for (k = 0; k < BITS_PER_BYTE; k++)
                {
-                       *r++ = (x & BITHIGH) ? '1' : '0';
+                       *r++ = IS_HIGHBIT_SET(x) ? '1' : '0';
                        x <<= 1;
                }
        }
        x = *sp;
        for (k = i; k < len; k++)
        {
-               *r++ = (x & BITHIGH) ? '1' : '0';
+               *r++ = IS_HIGHBIT_SET(x) ? '1' : '0';
                x <<= 1;
        }
        *r = '\0';
Index: src/backend/utils/mb/conv.c
===================================================================
RCS file: /cvsroot/pgsql/src/backend/utils/mb/conv.c,v
retrieving revision 1.56
diff -c -c -u -r1.56 conv.c
--- src/backend/utils/mb/conv.c 29 Oct 2005 00:31:52 -0000      1.56
+++ src/backend/utils/mb/conv.c 25 Dec 2005 02:06:38 -0000
@@ -413,7 +413,7 @@
 
        for (; len > 0 && *iso; len -= l)
        {
-               if (*iso < 0x80)
+               if (!IS_HIGHBIT_SET(*iso))
                {
                        *utf++ = *iso++;
                        l = 1;
Index: src/backend/utils/mb/wchar.c
===================================================================
RCS file: /cvsroot/pgsql/src/backend/utils/mb/wchar.c,v
retrieving revision 1.50
diff -c -c -u -r1.50 wchar.c
--- src/backend/utils/mb/wchar.c        24 Dec 2005 17:19:40 -0000      1.50
+++ src/backend/utils/mb/wchar.c        25 Dec 2005 02:06:38 -0000
@@ -79,7 +79,7 @@
                        *to |= *from++;
                        len -= 3;
                }
-               else if ((*from & 0x80) && len >= 2)    /* JIS X 0208 KANJI */
+               else if (IS_HIGHBIT_SET(*from) && len >= 2)     /* JIS X 0208 
KANJI */
                {
                        *to = *from++ << 8;
                        *to |= *from++;
@@ -106,7 +106,7 @@
                len = 2;
        else if (*s == SS3)
                len = 3;
-       else if (*s & 0x80)
+       else if (IS_HIGHBIT_SET(*s))
                len = 2;
        else
                len = 1;
@@ -122,7 +122,7 @@
                len = 2;
        else if (*s == SS3)
                len = 2;
-       else if (*s & 0x80)
+       else if (IS_HIGHBIT_SET(*s))
                len = 2;
        else
                len = 1;
@@ -153,7 +153,7 @@
                len = 1;
        else if (*s == SS3)
                len = 2;
-       else if (*s & 0x80)
+       else if (IS_HIGHBIT_SET(*s))
                len = 2;
        else
                len = 1;
@@ -206,7 +206,7 @@
                        *to |= *from++;
                        len -= 3;
                }
-               else if ((*from & 0x80) && len >= 2)    /* code set 1 */
+               else if (IS_HIGHBIT_SET(*from) && len >= 2)     /* code set 1 */
                {
                        *to = *from++ << 8;
                        *to |= *from++;
@@ -229,7 +229,7 @@
 {
        int                     len;
 
-       if (*s & 0x80)
+       if (IS_HIGHBIT_SET(*s))
                len = 2;
        else
                len = 1;
@@ -241,7 +241,7 @@
 {
        int                     len;
 
-       if (*s & 0x80)
+       if (IS_HIGHBIT_SET(*s))
                len = 2;
        else
                len = 1;
@@ -274,7 +274,7 @@
                        *to |= *from++;
                        len -= 3;
                }
-               else if ((*from & 0x80) && len >= 2)    /* code set 2 */
+               else if (IS_HIGHBIT_SET(*from) && len >= 2)     /* code set 2 */
                {
                        *to = *from++ << 8;
                        *to |= *from++;
@@ -301,7 +301,7 @@
                len = 4;
        else if (*s == SS3)
                len = 3;
-       else if (*s & 0x80)
+       else if (IS_HIGHBIT_SET(*s))
                len = 2;
        else
                len = 1;
@@ -317,7 +317,7 @@
                len = 2;
        else if (*s == SS3)
                len = 2;
-       else if (*s & 0x80)
+       else if (IS_HIGHBIT_SET(*s))
                len = 2;
        else
                len = 1;
@@ -361,7 +361,7 @@
 
        while (len > 0 && *from)
        {
-               if ((*from & 0x80) == 0)
+               if (!IS_HIGHBIT_SET(*from))
                {
                        *to = *from++;
                        len--;
@@ -866,7 +866,7 @@
                                 * we expect that every multibyte char consists 
of bytes
                                 * having the 8th bit set
                                 */
-                               if (i >= len || (mbstr[i] & 0x80) == 0)
+                               if (i >= len || !IS_HIGHBIT_SET(mbstr[i]))
                                {
                                        char            buf[8 * 2 + 1];
                                        char       *p = buf;
Index: src/backend/utils/mb/conversion_procs/euc_cn_and_mic/euc_cn_and_mic.c
===================================================================
RCS file: 
/cvsroot/pgsql/src/backend/utils/mb/conversion_procs/euc_cn_and_mic/euc_cn_and_mic.c,v
retrieving revision 1.10
diff -c -c -u -r1.10 euc_cn_and_mic.c
--- src/backend/utils/mb/conversion_procs/euc_cn_and_mic/euc_cn_and_mic.c       
24 Sep 2005 17:53:18 -0000      1.10
+++ src/backend/utils/mb/conversion_procs/euc_cn_and_mic/euc_cn_and_mic.c       
25 Dec 2005 02:06:38 -0000
@@ -77,7 +77,7 @@
 
        while (len >= 0 && (c1 = *euc++))
        {
-               if (c1 & 0x80)
+               if (IS_HIGHBIT_SET(c1))
                {
                        len -= 2;
                        *p++ = LC_GB2312_80;
Index: src/backend/utils/mb/conversion_procs/euc_kr_and_mic/euc_kr_and_mic.c
===================================================================
RCS file: 
/cvsroot/pgsql/src/backend/utils/mb/conversion_procs/euc_kr_and_mic/euc_kr_and_mic.c,v
retrieving revision 1.10
diff -c -c -u -r1.10 euc_kr_and_mic.c
--- src/backend/utils/mb/conversion_procs/euc_kr_and_mic/euc_kr_and_mic.c       
24 Sep 2005 17:53:19 -0000      1.10
+++ src/backend/utils/mb/conversion_procs/euc_kr_and_mic/euc_kr_and_mic.c       
25 Dec 2005 02:06:38 -0000
@@ -77,7 +77,7 @@
 
        while (len >= 0 && (c1 = *euc++))
        {
-               if (c1 & 0x80)
+               if (IS_HIGHBIT_SET(c1))
                {
                        len -= 2;
                        *p++ = LC_KS5601;
Index: src/backend/utils/mb/conversion_procs/euc_tw_and_big5/euc_tw_and_big5.c
===================================================================
RCS file: 
/cvsroot/pgsql/src/backend/utils/mb/conversion_procs/euc_tw_and_big5/euc_tw_and_big5.c,v
retrieving revision 1.10
diff -c -c -u -r1.10 euc_tw_and_big5.c
--- src/backend/utils/mb/conversion_procs/euc_tw_and_big5/euc_tw_and_big5.c     
24 Sep 2005 17:53:19 -0000      1.10
+++ src/backend/utils/mb/conversion_procs/euc_tw_and_big5/euc_tw_and_big5.c     
25 Dec 2005 02:06:38 -0000
@@ -177,7 +177,7 @@
                        *p++ = *euc++;
                        *p++ = *euc++;
                }
-               else if (c1 & 0x80)
+               else if (IS_HIGHBIT_SET(c1))
                {                                               /* CNS11643-1 */
                        len -= 2;
                        *p++ = LC_CNS11643_1;
Index: 
src/backend/utils/mb/conversion_procs/utf8_and_iso8859_1/utf8_and_iso8859_1.c
===================================================================
RCS file: 
/cvsroot/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_iso8859_1/utf8_and_iso8859_1.c,v
retrieving revision 1.12
diff -c -c -u -r1.12 utf8_and_iso8859_1.c
--- 
src/backend/utils/mb/conversion_procs/utf8_and_iso8859_1/utf8_and_iso8859_1.c   
    24 Sep 2005 17:53:24 -0000      1.12
+++ 
src/backend/utils/mb/conversion_procs/utf8_and_iso8859_1/utf8_and_iso8859_1.c   
    25 Dec 2005 02:06:38 -0000
@@ -46,12 +46,12 @@
 
        while (len-- > 0 && (c = *src++))
        {
-               if (c < 0x80)
+               if (!IS_HIGHBIT_SET(c))
                        *dest++ = c;
                else
                {
                        *dest++ = (c >> 6) | 0xc0;
-                       *dest++ = (c & 0x003f) | 0x80;
+                       *dest++ = (c & 0x003f) | HIGHBIT;
                }
        }
        *dest = '\0';
Index: src/include/c.h
===================================================================
RCS file: /cvsroot/pgsql/src/include/c.h,v
retrieving revision 1.192
diff -c -c -u -r1.192 c.h
--- src/include/c.h     6 Dec 2005 02:29:03 -0000       1.192
+++ src/include/c.h     25 Dec 2005 02:06:39 -0000
@@ -704,7 +704,8 @@
  */
 
 /* msb for char */
-#define CSIGNBIT (0x80)
+#define HIGHBIT                                        (0x80)
+#define IS_HIGHBIT_SET(ch)             ((unsigned char)(ch) & HIGHBIT)
 
 #define STATUS_OK                              (0)
 #define STATUS_ERROR                   (-1)
Index: src/include/utils/varbit.h
===================================================================
RCS file: /cvsroot/pgsql/src/include/utils/varbit.h,v
retrieving revision 1.21
diff -c -c -u -r1.21 varbit.h
--- src/include/utils/varbit.h  31 Dec 2004 22:03:46 -0000      1.21
+++ src/include/utils/varbit.h  25 Dec 2005 02:06:39 -0000
@@ -58,7 +58,6 @@
 #define VARBITEND(PTR)         (((bits8 *) (PTR)) + VARSIZE(PTR))
 /* Mask that will cover exactly one byte, i.e. BITS_PER_BYTE bits */
 #define BITMASK 0xFF
-#define BITHIGH 0x80
 
 
 extern Datum bit_in(PG_FUNCTION_ARGS);
Index: src/port/pgstrcasecmp.c
===================================================================
RCS file: /cvsroot/pgsql/src/port/pgstrcasecmp.c,v
retrieving revision 1.5
diff -c -c -u -r1.5 pgstrcasecmp.c
--- src/port/pgstrcasecmp.c     31 Dec 2004 22:03:53 -0000      1.5
+++ src/port/pgstrcasecmp.c     25 Dec 2005 02:06:40 -0000
@@ -40,12 +40,12 @@
                {
                        if (ch1 >= 'A' && ch1 <= 'Z')
                                ch1 += 'a' - 'A';
-                       else if (ch1 >= 0x80 && isupper(ch1))
+                       else if (IS_HIGHBIT_SET(ch1) && isupper(ch1))
                                ch1 = tolower(ch1);
 
                        if (ch2 >= 'A' && ch2 <= 'Z')
                                ch2 += 'a' - 'A';
-                       else if (ch2 >= 0x80 && isupper(ch2))
+                       else if (IS_HIGHBIT_SET(ch2) && isupper(ch2))
                                ch2 = tolower(ch2);
 
                        if (ch1 != ch2)
@@ -73,12 +73,12 @@
                {
                        if (ch1 >= 'A' && ch1 <= 'Z')
                                ch1 += 'a' - 'A';
-                       else if (ch1 >= 0x80 && isupper(ch1))
+                       else if (IS_HIGHBIT_SET(ch1) && isupper(ch1))
                                ch1 = tolower(ch1);
 
                        if (ch2 >= 'A' && ch2 <= 'Z')
                                ch2 += 'a' - 'A';
-                       else if (ch2 >= 0x80 && isupper(ch2))
+                       else if (IS_HIGHBIT_SET(ch2) && isupper(ch2))
                                ch2 = tolower(ch2);
 
                        if (ch1 != ch2)
@@ -102,7 +102,7 @@
 {
        if (ch >= 'a' && ch <= 'z')
                ch += 'A' - 'a';
-       else if (ch >= 0x80 && islower(ch))
+       else if (IS_HIGHBIT_SET(ch) && islower(ch))
                ch = toupper(ch);
        return ch;
 }
@@ -119,7 +119,7 @@
 {
        if (ch >= 'A' && ch <= 'Z')
                ch += 'a' - 'A';
-       else if (ch >= 0x80 && isupper(ch))
+       else if (IS_HIGHBIT_SET(ch) && isupper(ch))
                ch = tolower(ch);
        return ch;
 }
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