Fix regex wctype namespace (bug 18495)

[Joseph Myers]

regcomp brings in references to various wctype functions that aren't
in all the standards including regcomp.  This patch fixes this in the
usual way by using the __* versions of these functions (which already
exist, but some didn't have libc_hidden_proto / libc_hidden_def
before).

Tested for x86_64 and x86 (testsuite, and that installed stripped
shared libraries are unchanged by the patch).  (Other wide character
function references from the regex code mean that this patch by itself
doesn't fix any XFAILed linknamespace test failures; further patches
will be needed for that.  This patch is independent of my other
pending linknamespace patch
<https://sourceware.org/ml/libc-alpha/2015-06/msg00091.html>.)

2015-06-05  Joseph Myers  <joseph@codesourcery.com>

	[BZ #18495]
	* wctype/wcfuncs.c (__iswalnum): Use libc_hidden_def.
	(__iswlower): Likewise.
	* include/wctype.h (__iswalnum): Declare.  Use libc_hidden_proto.
	(__iswlower): Likewise.
	* posix/regcomp.c (re_compile_fastmap_iter): Call __towlower
	instead of towlower.
	* posix/regex_internal.c (build_wcs_upper_buffer): Call __iswlower
	instead of iswlower.  Call __towupper instead of towupper.
	* posix/regex_internal.h (IS_WIDE_WORD_CHAR): Call __iswalnum
	instead of iswalnum.

diff --git a/include/wctype.h b/include/wctype.h
index 88c78e6..a71b103 100644
--- a/include/wctype.h
+++ b/include/wctype.h
@@ -46,11 +46,13 @@ extern wctype_t __wctype (const char *__property);
 extern wctrans_t __wctrans (const char *__property);
 extern wint_t __towctrans (wint_t __wc, wctrans_t __desc);
 
+extern __typeof (iswalnum) __iswalnum __THROW __attribute_pure__;
 extern __typeof (iswalnum_l) __iswalnum_l;
 extern __typeof (iswalpha_l) __iswalpha_l;
 extern __typeof (iswblank_l) __iswblank_l;
 extern __typeof (iswcntrl_l) __iswcntrl_l;
 extern __typeof (iswdigit_l) __iswdigit_l;
+extern __typeof (iswlower) __iswlower __THROW __attribute_pure__;
 extern __typeof (iswlower_l) __iswlower_l;
 extern __typeof (iswgraph_l) __iswgraph_l;
 extern __typeof (iswprint_l) __iswprint_l;
@@ -65,11 +67,13 @@ extern __typeof (towupper) __towupper __THROW __attribute_pure__;
 
 libc_hidden_proto (__towctrans)
 libc_hidden_proto (__iswctype)
+libc_hidden_proto (__iswalnum)
 libc_hidden_proto (__iswalnum_l)
 libc_hidden_proto (__iswalpha_l)
 libc_hidden_proto (__iswblank_l)
 libc_hidden_proto (__iswcntrl_l)
 libc_hidden_proto (__iswdigit_l)
+libc_hidden_proto (__iswlower)
 libc_hidden_proto (__iswlower_l)
 libc_hidden_proto (__iswgraph_l)
 libc_hidden_proto (__iswprint_l)
diff --git a/posix/regcomp.c b/posix/regcomp.c
index 0adde3d..728c482 100644
--- a/posix/regcomp.c
+++ b/posix/regcomp.c
@@ -334,7 +334,7 @@ re_compile_fastmap_iter (regex_t *bufp, const re_dfastate_t *init_state,
 	      memset (&state, '\0', sizeof (state));
 	      if (__mbrtowc (&wc, (const char *) buf, p - buf,
 			     &state) == p - buf
-		  && (__wcrtomb ((char *) buf, towlower (wc), &state)
+		  && (__wcrtomb ((char *) buf, __towlower (wc), &state)
 		      != (size_t) -1))
 		re_set_fastmap (fastmap, 0, buf[0]);
 	    }
@@ -410,7 +410,7 @@ re_compile_fastmap_iter (regex_t *bufp, const re_dfastate_t *init_state,
 		    re_set_fastmap (fastmap, icase, *(unsigned char *) buf);
 		  if ((bufp->syntax & RE_ICASE) && dfa->mb_cur_max > 1)
 		    {
-		      if (__wcrtomb (buf, towlower (cset->mbchars[i]), &state)
+		      if (__wcrtomb (buf, __towlower (cset->mbchars[i]), &state)
 			  != (size_t) -1)
 			re_set_fastmap (fastmap, false, *(unsigned char *) buf);
 		    }
diff --git a/posix/regex_internal.c b/posix/regex_internal.c
index e5a14cd..d77d3a1 100644
--- a/posix/regex_internal.c
+++ b/posix/regex_internal.c
@@ -312,11 +312,11 @@ build_wcs_upper_buffer (re_string_t *pstr)
 	  if (BE (mbclen + 2 > 2, 1))
 	    {
 	      wchar_t wcu = wc;
-	      if (iswlower (wc))
+	      if (__iswlower (wc))
 		{
 		  size_t mbcdlen;
 
-		  wcu = towupper (wc);
+		  wcu = __towupper (wc);
 		  mbcdlen = wcrtomb (buf, wcu, &prev_st);
 		  if (BE (mbclen == mbcdlen, 1))
 		    memcpy (pstr->mbs + byte_idx, buf, mbclen);
@@ -382,11 +382,11 @@ build_wcs_upper_buffer (re_string_t *pstr)
 	if (BE (mbclen + 2 > 2, 1))
 	  {
 	    wchar_t wcu = wc;
-	    if (iswlower (wc))
+	    if (__iswlower (wc))
 	      {
 		size_t mbcdlen;
 
-		wcu = towupper (wc);
+		wcu = __towupper (wc);
 		mbcdlen = wcrtomb ((char *) buf, wcu, &prev_st);
 		if (BE (mbclen == mbcdlen, 1))
 		  memcpy (pstr->mbs + byte_idx, buf, mbclen);
diff --git a/posix/regex_internal.h b/posix/regex_internal.h
index 7fc6d52..154e969 100644
--- a/posix/regex_internal.h
+++ b/posix/regex_internal.h
@@ -471,7 +471,7 @@ typedef struct bin_tree_storage_t bin_tree_storage_t;
 
 #define IS_WORD_CHAR(ch) (isalnum (ch) || (ch) == '_')
 #define IS_NEWLINE(ch) ((ch) == NEWLINE_CHAR)
-#define IS_WIDE_WORD_CHAR(ch) (iswalnum (ch) || (ch) == L'_')
+#define IS_WIDE_WORD_CHAR(ch) (__iswalnum (ch) || (ch) == L'_')
 #define IS_WIDE_NEWLINE(ch) ((ch) == WIDE_NEWLINE_CHAR)
 
 #define NOT_SATISFY_PREV_CONSTRAINT(constraint,context) \
diff --git a/wctype/wcfuncs.c b/wctype/wcfuncs.c
index 788fed9..e7c0308 100644
--- a/wctype/wcfuncs.c
+++ b/wctype/wcfuncs.c
@@ -38,6 +38,7 @@
 
 #undef iswalnum
 func (alnum, __ISwalnum)
+libc_hidden_def (__iswalnum)
 libc_hidden_weak (iswalnum)
 #undef iswalpha
 func (alpha, __ISwalpha)
@@ -51,6 +52,7 @@ func (digit, __ISwdigit)
 libc_hidden_weak (iswdigit)
 #undef iswlower
 func (lower, __ISwlower)
+libc_hidden_def (__iswlower)
 libc_hidden_weak (iswlower)
 #undef iswgraph
 func (graph, __ISwgraph)

-- 
Joseph S. Myers
joseph@codesourcery.com