The explanation of these three changes is available from

http://lists.gnu.org/archive/html/bug-gnu-utils/2004-11/msg00096.html
http://lists.gnu.org/archive/html/bug-gnu-utils/2004-11/msg00098.html
http://lists.gnu.org/archive/html/bug-gnu-utils/2004-11/msg00097.html

respectively.


--- dfa.c	2004-12-16 09:27:24.000000000 +0100
+++ dfa.c	2004-12-16 13:20:30.000000000 +0100
@@ -595,6 +595,9 @@
 		{
 		  wctype_t wt;
 		  /* Query the character class as wctype_t.  */
+                 if (case_fold && (strcmp(str, "upper") == 0 || strcmp(str, "lower") == 0))
+                    strcpy(str, "alpha");
+
 		  wt = wctype (str);
 
 		  if (ch_classes_al == 0)
@@ -633,7 +636,7 @@
 		      work_mbc->coll_elems[work_mbc->ncoll_elems++] = elem;
 		    }
  		}
-	      wc = WEOF;
+	      wc = wc1 = WEOF;
 	    }
 	  else
 	    /* We treat '[' as a normal character here.  */
@@ -681,6 +684,28 @@
 	  REALLOC_IF_NECESSARY(work_mbc->range_ends, wchar_t,
 			       range_ends_al, work_mbc->nranges + 1);
 	  work_mbc->range_ends[work_mbc->nranges++] = (wchar_t)wc2;
+	  if (case_fold && (iswlower((wint_t)wc) || iswupper((wint_t)wc))
+                         && (iswlower((wint_t)wc2) || iswupper((wint_t)wc2)))
+	    {
+               wint_t altcase;
+               altcase = wc;
+               if (iswlower((wint_t)wc))
+                  altcase = towupper((wint_t)wc);
+               else
+                  altcase = towlower((wint_t)wc);
+               REALLOC_IF_NECESSARY(work_mbc->range_sts, wchar_t,
+                               range_sts_al, work_mbc->nranges + 1);
+               work_mbc->range_sts[work_mbc->nranges] = (wchar_t)altcase;
+
+               altcase = wc2;
+               if (iswlower((wint_t)wc2))
+                  altcase = towupper((wint_t)wc2);
+               else
+                  altcase = towlower((wint_t)wc2);
+               REALLOC_IF_NECESSARY(work_mbc->range_ends, wchar_t,
+                               range_ends_al, work_mbc->nranges + 1);
+               work_mbc->range_ends[work_mbc->nranges++] = (wchar_t)altcase;
+          }
 	}
       else if (wc != WEOF)
 	/* build normal characters.  */