The problem is: currently our single byte ctype(3) functions are broken

for wide characters locales in the argument range >= 0x80 - they may
return false positives.

Example 1: for UTF-8 locale we currently have:
iswspace(0xA0)==1 and isspace(0xA0)==1
(because iswspace() and isspace() are the same code)
but must have
iswspace(0xA0)==1 and isspace(0xA0)==0
(because there is no such character and all others in the range
0x80..0xff for the UTF-8 locale, it keeps ASCII only in the single byte
range because our internal wchar_t representation for UTF-8 is UCS-4).

Example 2: for all wide character locales isalpha(arg) when arg > 0xFF may
return false positives (must be 0).
(because iswalpha() and isalpha() are the same code)

This change address this issue separating single byte and wide ctype
and also fix iswascii() (currently iswascii() is broken for
arguments > 0xFF).
This change is 100% binary compatible with old binaries.

Reviewied by: i18n@

12 files changed, 57 insertions, 21 deletions

diff --git a/lib/libc/locale/Symbol.map b/lib/libc/locale/Symbol.map
index 12daba1..20d092b 100644
--- a/lib/libc/locale/Symbol.map
+++ b/lib/libc/locale/Symbol.map
@@ -60,12 +60,17 @@ FBSD_1.0 {
 	nextwctype;
 	nl_langinfo;
 	__maskrune;
+	__sbmaskrune;
 	__istype;
+	__sbistype;
 	__isctype;
 	__toupper;
+	__sbtoupper;
 	__tolower;
+	__sbtolower;
 	__wcwidth;
 	__mb_cur_max;
+	__mb_sb_limit;
 	rpmatch;
 	___runetype;
 	setlocale;
diff --git a/lib/libc/locale/big5.c b/lib/libc/locale/big5.c
index 44b9957..19977d0 100644
--- a/lib/libc/locale/big5.c
+++ b/lib/libc/locale/big5.c
@@ -49,6 +49,8 @@ __FBSDID("$FreeBSD$");
 #include <wchar.h>
 #include "mblocal.h"
 
+extern int __mb_sb_limit;
+
 static size_t	_BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict,
 		    size_t, mbstate_t * __restrict);
 static int	_BIG5_mbsinit(const mbstate_t *);
@@ -68,6 +70,7 @@ _BIG5_init(_RuneLocale *rl)
 	__mbsinit = _BIG5_mbsinit;
 	_CurrentRuneLocale = rl;
 	__mb_cur_max = 2;
+	__mb_sb_limit = 128;
 	return (0);
 }
 
diff --git a/lib/libc/locale/euc.c b/lib/libc/locale/euc.c
index b3b35ed..188073e 100644
--- a/lib/libc/locale/euc.c
+++ b/lib/libc/locale/euc.c
@@ -49,6 +49,8 @@ __FBSDID("$FreeBSD$");
 #include <wchar.h>
 #include "mblocal.h"
 
+extern int __mb_sb_limit;
+
 static size_t	_EUC_mbrtowc(wchar_t * __restrict, const char * __restrict,
 		    size_t, mbstate_t * __restrict);
 static int	_EUC_mbsinit(const mbstate_t *);
@@ -116,6 +118,7 @@ _EUC_init(_RuneLocale *rl)
 	__mbrtowc = _EUC_mbrtowc;
 	__wcrtomb = _EUC_wcrtomb;
 	__mbsinit = _EUC_mbsinit;
+	__mb_sb_limit = 256;
 	return (0);
 }
 
diff --git a/lib/libc/locale/gb18030.c b/lib/libc/locale/gb18030.c
index 3e43179..1457d3e 100644
--- a/lib/libc/locale/gb18030.c
+++ b/lib/libc/locale/gb18030.c
@@ -39,6 +39,8 @@ __FBSDID("$FreeBSD$");
 #include <wchar.h>
 #include "mblocal.h"
 
+extern int __mb_sb_limit;
+
 static size_t	_GB18030_mbrtowc(wchar_t * __restrict, const char * __restrict,
 		    size_t, mbstate_t * __restrict);
 static int	_GB18030_mbsinit(const mbstate_t *);
@@ -59,6 +61,7 @@ _GB18030_init(_RuneLocale *rl)
 	__mbsinit = _GB18030_mbsinit;
 	_CurrentRuneLocale = rl;
 	__mb_cur_max = 4;
+	__mb_sb_limit = 128;
 
 	return (0);
 }
diff --git a/lib/libc/locale/gb2312.c b/lib/libc/locale/gb2312.c
index 232daba..74a7bdc 100644
--- a/lib/libc/locale/gb2312.c
+++ b/lib/libc/locale/gb2312.c
@@ -35,6 +35,8 @@ __FBSDID("$FreeBSD$");
 #include <wchar.h>
 #include "mblocal.h"
 
+extern int __mb_sb_limit;
+
 static size_t	_GB2312_mbrtowc(wchar_t * __restrict, const char * __restrict,
 		    size_t, mbstate_t * __restrict);
 static int	_GB2312_mbsinit(const mbstate_t *);
@@ -55,6 +57,7 @@ _GB2312_init(_RuneLocale *rl)
 	__wcrtomb = _GB2312_wcrtomb;
 	__mbsinit = _GB2312_mbsinit;
 	__mb_cur_max = 2;
+	__mb_sb_limit = 128;
 	return (0);
 }
 
diff --git a/lib/libc/locale/gbk.c b/lib/libc/locale/gbk.c
index 5288293..802f78e 100644
--- a/lib/libc/locale/gbk.c
+++ b/lib/libc/locale/gbk.c
@@ -42,6 +42,8 @@ __FBSDID("$FreeBSD$");
 #include <wchar.h>
 #include "mblocal.h"
 
+extern int __mb_sb_limit;
+
 static size_t	_GBK_mbrtowc(wchar_t * __restrict, const char * __restrict,
 		    size_t, mbstate_t * __restrict);
 static int	_GBK_mbsinit(const mbstate_t *);
@@ -61,6 +63,7 @@ _GBK_init(_RuneLocale *rl)
 	__mbsinit = _GBK_mbsinit;
 	_CurrentRuneLocale = rl;
 	__mb_cur_max = 2;
+	__mb_sb_limit = 128;
 	return (0);
 }
 
diff --git a/lib/libc/locale/isctype.c b/lib/libc/locale/isctype.c
index 13ac6c2..be1b091 100644
--- a/lib/libc/locale/isctype.c
+++ b/lib/libc/locale/isctype.c
@@ -48,7 +48,7 @@ int
 digittoint(c)
 	int c;
 {
-	return (__maskrune(c, 0xFF));
+	return (__sbmaskrune(c, 0xFF));
 }
 
 #undef isalnum
@@ -56,7 +56,7 @@ int
 isalnum(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_A|_CTYPE_D));
+	return (__sbistype(c, _CTYPE_A|_CTYPE_D));
 }
 
 #undef isalpha
@@ -64,7 +64,7 @@ int
 isalpha(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_A));
+	return (__sbistype(c, _CTYPE_A));
 }
 
 #undef isascii
@@ -80,7 +80,7 @@ int
 isblank(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_B));
+	return (__sbistype(c, _CTYPE_B));
 }
 
 #undef iscntrl
@@ -88,7 +88,7 @@ int
 iscntrl(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_C));
+	return (__sbistype(c, _CTYPE_C));
 }
 
 #undef isdigit
@@ -104,7 +104,7 @@ int
 isgraph(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_G));
+	return (__sbistype(c, _CTYPE_G));
 }
 
 #undef ishexnumber 
@@ -112,7 +112,7 @@ int
 ishexnumber(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_X));
+	return (__sbistype(c, _CTYPE_X));
 }
 
 #undef isideogram
@@ -120,7 +120,7 @@ int
 isideogram(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_I));
+	return (__sbistype(c, _CTYPE_I));
 }
 
 #undef islower
@@ -128,7 +128,7 @@ int
 islower(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_L));
+	return (__sbistype(c, _CTYPE_L));
 }
 
 #undef isnumber
@@ -136,7 +136,7 @@ int
 isnumber(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_D));
+	return (__sbistype(c, _CTYPE_D));
 }
 
 #undef isphonogram	
@@ -144,7 +144,7 @@ int
 isphonogram(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_Q));
+	return (__sbistype(c, _CTYPE_Q));
 }
 
 #undef isprint
@@ -152,7 +152,7 @@ int
 isprint(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_R));
+	return (__sbistype(c, _CTYPE_R));
 }
 
 #undef ispunct
@@ -160,7 +160,7 @@ int
 ispunct(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_P));
+	return (__sbistype(c, _CTYPE_P));
 }
 
 #undef isrune
@@ -168,7 +168,7 @@ int
 isrune(c)
 	int c;
 {
-	return (__istype(c, 0xFFFFFF00L));
+	return (__sbistype(c, 0xFFFFFF00L));
 }
 
 #undef isspace
@@ -176,7 +176,7 @@ int
 isspace(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_S));
+	return (__sbistype(c, _CTYPE_S));
 }
 
 #undef isspecial
@@ -184,7 +184,7 @@ int
 isspecial(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_T));
+	return (__sbistype(c, _CTYPE_T));
 }
 
 #undef isupper
@@ -192,7 +192,7 @@ int
 isupper(c)
 	int c;
 {
-	return (__istype(c, _CTYPE_U));
+	return (__sbistype(c, _CTYPE_U));
 }
 
 #undef isxdigit
@@ -216,7 +216,7 @@ int
 tolower(c)
 	int c;
 {
-        return (__tolower(c));
+	return (__sbtolower(c));
 }
 
 #undef toupper
@@ -224,6 +224,6 @@ int
 toupper(c)
 	int c;
 {
-        return (__toupper(c));
+	return (__sbtoupper(c));
 }
 
diff --git a/lib/libc/locale/iswctype.c b/lib/libc/locale/iswctype.c
index eaa1bf3..c2e0f53 100644
--- a/lib/libc/locale/iswctype.c
+++ b/lib/libc/locale/iswctype.c
@@ -61,7 +61,7 @@ int
 iswascii(wc)
 	wint_t wc;
 {
-	return ((wc & ~0x7F) == 0);
+	return (wc < 0x80);
 }
 
 #undef iswblank
diff --git a/lib/libc/locale/mskanji.c b/lib/libc/locale/mskanji.c
index aba87e7..9ee91de 100644
--- a/lib/libc/locale/mskanji.c
+++ b/lib/libc/locale/mskanji.c
@@ -47,6 +47,8 @@ __FBSDID("$FreeBSD$");
 #include <wchar.h>
 #include "mblocal.h"
 
+extern int __mb_sb_limit;
+
 static size_t	_MSKanji_mbrtowc(wchar_t * __restrict, const char * __restrict,
 		    size_t, mbstate_t * __restrict);
 static int	_MSKanji_mbsinit(const mbstate_t *);
@@ -66,6 +68,7 @@ _MSKanji_init(_RuneLocale *rl)
 	__mbsinit = _MSKanji_mbsinit;
 	_CurrentRuneLocale = rl;
 	__mb_cur_max = 2;
+	__mb_sb_limit = 256;
 	return (0);
 }
 
diff --git a/lib/libc/locale/none.c b/lib/libc/locale/none.c
index 79981e5..22fcd20 100644
--- a/lib/libc/locale/none.c
+++ b/lib/libc/locale/none.c
@@ -58,6 +58,11 @@ static size_t	_none_wcrtomb(char * __restrict, wchar_t,
 static size_t	_none_wcsnrtombs(char * __restrict, const wchar_t ** __restrict,
 		    size_t, size_t, mbstate_t * __restrict);
 
+/* setup defaults */
+
+int __mb_cur_max = 1;
+int __mb_sb_limit = 256; /* Expected to be <= _CACHED_RUNES */
+
 int
 _none_init(_RuneLocale *rl)
 {
@@ -69,6 +74,7 @@ _none_init(_RuneLocale *rl)
 	__wcsnrtombs = _none_wcsnrtombs;
 	_CurrentRuneLocale = rl;
 	__mb_cur_max = 1;
+	__mb_sb_limit = 256;
 	return(0);
 }
 
@@ -176,7 +182,6 @@ _none_wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src,
 
 /* setup defaults */
 
-int __mb_cur_max = 1;
 size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict, size_t,
     mbstate_t * __restrict) = _none_mbrtowc;
 int (*__mbsinit)(const mbstate_t *) = _none_mbsinit;
diff --git a/lib/libc/locale/setrunelocale.c b/lib/libc/locale/setrunelocale.c
index 9484709..e723ea6 100644
--- a/lib/libc/locale/setrunelocale.c
+++ b/lib/libc/locale/setrunelocale.c
@@ -45,6 +45,8 @@ __FBSDID("$FreeBSD$");
 #include "mblocal.h"
 #include "setlocale.h"
 
+extern int __mb_sb_limit;
+
 extern _RuneLocale	*_Read_RuneMagi(FILE *);
 
 static int		__setrunelocale(const char *);
@@ -59,6 +61,7 @@ __setrunelocale(const char *encoding)
 	static char ctype_encoding[ENCODING_LEN + 1];
 	static _RuneLocale *CachedRuneLocale;
 	static int Cached__mb_cur_max;
+	static int Cached__mb_sb_limit;
 	static size_t (*Cached__mbrtowc)(wchar_t * __restrict,
 	    const char * __restrict, size_t, mbstate_t * __restrict);
 	static size_t (*Cached__wcrtomb)(char * __restrict, wchar_t,
@@ -85,6 +88,7 @@ __setrunelocale(const char *encoding)
 	    strcmp(encoding, ctype_encoding) == 0) {
 		_CurrentRuneLocale = CachedRuneLocale;
 		__mb_cur_max = Cached__mb_cur_max;
+		__mb_sb_limit = Cached__mb_sb_limit;
 		__mbrtowc = Cached__mbrtowc;
 		__mbsinit = Cached__mbsinit;
 		__mbsnrtowcs = Cached__mbsnrtowcs;
@@ -147,6 +151,7 @@ __setrunelocale(const char *encoding)
 		}
 		CachedRuneLocale = _CurrentRuneLocale;
 		Cached__mb_cur_max = __mb_cur_max;
+		Cached__mb_sb_limit = __mb_sb_limit;
 		Cached__mbrtowc = __mbrtowc;
 		Cached__mbsinit = __mbsinit;
 		Cached__mbsnrtowcs = __mbsnrtowcs;
diff --git a/lib/libc/locale/utf8.c b/lib/libc/locale/utf8.c
index e467fc0..086a1e4 100644
--- a/lib/libc/locale/utf8.c
+++ b/lib/libc/locale/utf8.c
@@ -35,6 +35,8 @@ __FBSDID("$FreeBSD$");
 #include <wchar.h>
 #include "mblocal.h"
 
+extern int __mb_sb_limit;
+
 static size_t	_UTF8_mbrtowc(wchar_t * __restrict, const char * __restrict,
 		    size_t, mbstate_t * __restrict);
 static int	_UTF8_mbsinit(const mbstate_t *);
@@ -63,6 +65,7 @@ _UTF8_init(_RuneLocale *rl)
 	__wcsnrtombs = _UTF8_wcsnrtombs;
 	_CurrentRuneLocale = rl;
 	__mb_cur_max = 6;
+	__mb_sb_limit = 128;
 
 	return (0);
 }